diff options
| -rw-r--r-- | Makefile | 48 | ||||
| -rw-r--r-- | TODO | 24 | ||||
| -rw-r--r-- | bootstrap.c | 95 | ||||
| -rw-r--r-- | dircat.c | 128 | ||||
| -rw-r--r-- | dircat.h | 29 | ||||
| -rw-r--r-- | main.c | 190 | ||||
| -rw-r--r-- | main.h | 25 | ||||
| -rw-r--r-- | netfs.c | 652 | ||||
| -rw-r--r-- | node.c | 195 | ||||
| -rw-r--r-- | process.c | 393 | ||||
| -rw-r--r-- | process.h | 27 | ||||
| -rw-r--r-- | procfs.c | 282 | ||||
| -rw-r--r-- | procfs.h | 263 | ||||
| -rw-r--r-- | procfs_dir.c | 691 | ||||
| -rw-r--r-- | procfs_dir.h | 63 | ||||
| -rw-r--r-- | procfs_nonpid_files.c | 527 | ||||
| -rw-r--r-- | procfs_pid.h | 88 | ||||
| -rw-r--r-- | procfs_pid_files.c | 583 | ||||
| -rw-r--r-- | proclist.c | 94 | ||||
| -rw-r--r-- | proclist.h | 23 | ||||
| -rw-r--r-- | rootdir.c | 506 | ||||
| -rw-r--r-- | rootdir.h | 23 |
22 files changed, 2177 insertions, 2772 deletions
@@ -1,30 +1,26 @@ -# Makefile - for procfs -# -# Copyright (C) 2008 Free Software Foundation, Inc. -# -# This program is free software; you can redistribute it and/or -# modify it under the terms of the GNU General Public License as -# published by the Free Software Foundation; either version 2, or (at -# your option) any later version. -# -# This program is distributed in the hope that it will be useful, but -# WITHOUT ANY WARRANTY; without even the implied warranty of -# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU -# General Public License for more details. -# -# You should have received a copy of the GNU General Public License -# along with this program; if not, write to the Free Software -# Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. +TARGET = procfs +OBJS = procfs.o netfs.o procfs_dir.o \ + process.o proclist.o rootdir.o dircat.o main.o +LIBS = -lnetfs -lps -dir := procfs -makemode := server +CC = gcc +CFLAGS = -Wall -g +CPPFLAGS = +LDFLAGS = -target = procfs +ifdef PROFILE +CFLAGS= -g -pg +CPPFLAGS= -DPROFILE +LDFLAGS= -static +LIBS= -lnetfs -lfshelp -liohelp -lps -lports -lthreads -lihash -lshouldbeinlibc +endif -SRCS = procfs.c bootstrap.c netfs.c procfs_dir.c node.c procfs_pid_files.c procfs_nonpid_files.c -LCLHDRS = procfs.h procfs_pid.h +CPPFLAGS += -D_GNU_SOURCE -D_FILE_OFFSET_BITS=64 -OBJS = $(SRCS:.c=.o) -HURDLIBS = netfs fshelp iohelp threads ports ihash ps shouldbeinlibc - -include ../Makeconf +all: $(TARGET) + +$(TARGET): $(OBJS) + $(CC) $(CFLAGS) $(LDFLAGS) -o $@ $^ $(LIBS) + +clean: + $(RM) $(TARGET) $(OBJS) @@ -0,0 +1,24 @@ +Known bugs to be fixed +---------------------- + +* The non-owned processes sometimes show up with INT_MAX as their owner, + instead of opt_anon_uid. This is likely to be a libps problem. + +Improvements and new features +----------------------------- + +* There is a lot of dynamic memory allocation going on and it comes with a + cost in performance. We could try to limit such allocation, as long as it + keeps the inner interface simple and preserves the read/readdir semantics + (performance is probably not critical for a proc filesystem.) + One way would be to add an (optional) "needed_length" field to + procfs_node_ops, and arrange to pass a sufficent buffer in (*contents, + *contents_len) when get_contents is called. Then the user-provided buffer + might be used directly under some circumstances. + +* Add thread directories as [pid]/task/[n]. This shouldn't be too hard if we + use "process" nodes for threads, and provide an "exists" hook for the "task" + entry itself so that it's disabled in thread nodes. It might prove necessary + to have "optional" libps flags for some content generators, though, since + some of them might be missing for threads. + diff --git a/bootstrap.c b/bootstrap.c deleted file mode 100644 index 73d31f0..0000000 --- a/bootstrap.c +++ /dev/null @@ -1,95 +0,0 @@ -/* procfs -- a translator for providing GNU/Linux compatible - proc pseudo-filesystem - - bootstrap.c -- This file is functions for starting up - and initializers for the procfs translator - defined in procfs.h - - Copyright (C) 2008, FSF. - Written as a Summer of Code Project - - procfs is free software; you can redistribute it and/or - modify it under the terms of the GNU General Public License as - published by the Free Software Foundation; either version 2, or (at - your option) any later version. - - procfs is distributed in the hope that it will be useful, but - WITHOUT ANY WARRANTY; without even the implied warranty of - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - General Public License for more details. - - You should have received a copy of the GNU General Public License - along with this program; if not, write to the Free Software - Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA. -*/ - -#include <stddef.h> -#include <hurd/ihash.h> -#include <hurd/netfs.h> - -#include "procfs.h" - -struct ps_context *ps_context; - -/* This function is used to initialize the whole translator, can be - effect called as bootstrapping the translator. */ -error_t procfs_init () -{ - error_t err; - - err = ps_context_create (getproc (), &ps_context); - - return err; -} - -/* Create a new procfs filesystem. */ -error_t procfs_create (char *procfs_root, int fsid, - struct procfs **fs) -{ - error_t err; - /* This is the enclosing directory for this filesystem's - root node */ - struct procfs_dir *topmost_root_dir; - - /* And also a topmost-root node, just used for locking - TOPMOST_ROOT_DIR. */ - struct node *topmost_root; - - /* The new node for the filesystem's root. */ - struct procfs *new = malloc (sizeof (struct procfs)); - - if (! new) - return ENOMEM; - - new->fsid = fsid; - new->next_inode = 2; - - hurd_ihash_init (&new->inode_mappings, - offsetof (struct procfs_dir_entry, inode_locp)); - spin_lock_init (&new->inode_mappings_lock); - - topmost_root = netfs_make_node (0); - if (! topmost_root) - err = ENOMEM; - else - { - err = procfs_dir_create (new, topmost_root, procfs_root, - &topmost_root_dir); - if (! err) - { - /* ADDITIONAL BOOTSTRAPPING OF THE ROOT NODE */ - err = procfs_dir_null_lookup (topmost_root_dir, &new->root); - } - } - - if (err) - { - hurd_ihash_destroy (&new->inode_mappings); - free (new); - } - else - *fs = new; - - return err; -} - diff --git a/dircat.c b/dircat.c new file mode 100644 index 0000000..5a60899 --- /dev/null +++ b/dircat.c @@ -0,0 +1,128 @@ +/* Hurd /proc filesystem, concatenation of two directories. + Copyright (C) 2010 Free Software Foundation, Inc. + + This file is part of the GNU Hurd. + + The GNU Hurd is free software; you can redistribute it and/or + modify it under the terms of the GNU General Public License as + published by the Free Software Foundation; either version 2, or (at + your option) any later version. + + The GNU Hurd is distributed in the hope that it will be useful, but + WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ + +#include <stdlib.h> +#include <string.h> +#include "procfs.h" + +struct dircat_node +{ + int num_dirs; + struct node *dirs[0]; +}; + +static error_t +dircat_get_contents (void *hook, char **contents, ssize_t *contents_len) +{ + struct dircat_node *dcn = hook; + int i, sz, pos; + error_t err; + + pos = 0; + *contents = malloc (sz = 512); + + for (i=0; i < dcn->num_dirs; i++) + { + char *subcon; + ssize_t sublen; + + /* Make sure we're not getting some old stuff. */ + procfs_refresh (dcn->dirs[i]); + + err = procfs_get_contents (dcn->dirs[i], &subcon, &sublen); + if (err) + { + free (*contents); + *contents = NULL; + return err; + } + + while (pos + sublen > sz) + *contents = realloc (*contents, sz *= 2); + + memcpy (*contents + pos, subcon, sublen); + pos += sublen; + } + + *contents_len = pos; + return 0; +} + +static error_t +dircat_lookup (void *hook, const char *name, struct node **np) +{ + struct dircat_node *dcn = hook; + error_t err; + int i; + + err = ENOENT; + for (i=0; err && i < dcn->num_dirs; i++) + err = procfs_lookup (dcn->dirs[i], name, np); + + return err; +} + +static void +dircat_release_dirs (struct node *const *dirs, int num_dirs) +{ + int i; + + for (i=0; i < num_dirs; i++) + if (dirs[i]) + netfs_nrele (dirs[i]); +} + +static void +dircat_cleanup (void *hook) +{ + struct dircat_node *dcn = hook; + + dircat_release_dirs (dcn->dirs, dcn->num_dirs); + free (dcn); +} + +struct node * +dircat_make_node (struct node *const *dirs, int num_dirs) +{ + static struct procfs_node_ops ops = { + .get_contents = dircat_get_contents, + .cleanup_contents = procfs_cleanup_contents_with_free, + .lookup = dircat_lookup, + .cleanup = dircat_cleanup, + }; + struct dircat_node *dcn; + int i; + + for (i=0; i < num_dirs; i++) + if (! dirs[i]) + goto fail; + + dcn = malloc (sizeof *dcn + num_dirs * sizeof dcn->dirs[0]); + if (! dcn) + goto fail; + + dcn->num_dirs = num_dirs; + memcpy (dcn->dirs, dirs, num_dirs * sizeof dcn->dirs[0]); + return procfs_make_node (&ops, dcn); + +fail: + dircat_release_dirs (dirs, num_dirs); + return NULL; +} + diff --git a/dircat.h b/dircat.h new file mode 100644 index 0000000..4177b38 --- /dev/null +++ b/dircat.h @@ -0,0 +1,29 @@ +/* Hurd /proc filesystem, concatenation of two directories. + Copyright (C) 2010 Free Software Foundation, Inc. + + This file is part of the GNU Hurd. + + The GNU Hurd is free software; you can redistribute it and/or + modify it under the terms of the GNU General Public License as + published by the Free Software Foundation; either version 2, or (at + your option) any later version. + + The GNU Hurd is distributed in the hope that it will be useful, but + WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ + +/* Append the contents of NUM_DIRS directories. DIRS is an array of + directory nodes. One reference is consumed for each of them. If a + memory allocation error occurs, or if one of the directories is a + NULL pointer, the references are dropped immediately and NULL is + returned. The given DIRS array is duplicated and can therefore be + allocated on the caller's stack. Strange things will happen if some + elements of DIRS have entries with the same name or if one of them is + not a directory. */ +struct node * +dircat_make_node (struct node *const *dirs, int num_dirs); @@ -0,0 +1,190 @@ +/* Hurd /proc filesystem, main program. + Copyright (C) 2010 Free Software Foundation, Inc. + + This file is part of the GNU Hurd. + + The GNU Hurd is free software; you can redistribute it and/or + modify it under the terms of the GNU General Public License as + published by the Free Software Foundation; either version 2, or (at + your option) any later version. + + The GNU Hurd is distributed in the hope that it will be useful, but + WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ + +#include <mach.h> +#include <hurd.h> +#include <unistd.h> +#include <error.h> +#include <argp.h> +#include <hurd/netfs.h> +#include <ps.h> +#include "procfs.h" +#include "proclist.h" +#include "rootdir.h" +#include "dircat.h" +#include "main.h" + +/* Command-line options */ +int opt_clk_tck; +mode_t opt_stat_mode; +pid_t opt_fake_self; +pid_t opt_kernel_pid; +uid_t opt_anon_owner; + +static error_t +argp_parser (int key, char *arg, struct argp_state *state) +{ + struct passwd *pw; + char *endp; + + switch (key) + { + case 'h': + opt_clk_tck = strtol (arg, &endp, 0); + if (*endp || ! *arg || opt_clk_tck <= 0) + error (1, 0, "--clk-tck: HZ should be a positive integer"); + break; + + case 's': + opt_stat_mode = strtol (arg, &endp, 8); + if (*endp || ! *arg || opt_stat_mode & ~07777) + error (1, 0, "--stat-mode: MODE should be an octal mode"); + break; + + case 'S': + if (arg) + { + opt_fake_self = strtol (arg, &endp, 0); + if (*endp || ! *arg) + error (1, 0, "--fake-self: PID must be an integer"); + } + else + opt_fake_self = 1; + break; + + case 'k': + opt_kernel_pid = strtol (arg, &endp, 0); + if (*endp || ! *arg || (signed) opt_kernel_pid < 0) + error (1, 0, "--kernel-process: PID must be a positive integer"); + break; + + case 'c': + opt_clk_tck = 100; + opt_stat_mode = 0444; + opt_fake_self = 1; + break; + + case 'a': + pw = getpwnam (arg); + if (pw) + { + opt_anon_owner = pw->pw_uid; + break; + } + + opt_anon_owner = strtol (arg, &endp, 0); + if (*endp || ! *arg || (signed) opt_anon_owner < 0) + error(1, 0, "--anonymous-owner: USER should be the a user name " + "or a numeric UID."); + break; + } + + return 0; +} + +struct argp argp = { + .options = (struct argp_option []) { + { "clk-tck", 'h', "HZ", 0, + "Unit used for the values expressed in system clock ticks " + "(default: sysconf(_SC_CLK_TCK))" }, + { "stat-mode", 's', "MODE", 0, + "The [pid]/stat file publishes information which on Hurd is only " + "available to the process owner. " + "You can use this option to override its mode to be more permissive " + "for compatibility purposes. " + "(default: 0400)" }, + { "fake-self", 'S', "PID", OPTION_ARG_OPTIONAL, + "Provide a fake \"self\" symlink to the given PID, for compatibility " + "purposes. If PID is omitted, \"self\" will point to init. " + "(default: no self link)" }, + { "kernel-process", 'k', "PID", 0, + "Process identifier for the kernel, used to retreive its command " + "line, as well as the global up and idle times. " + "(default: 2)" }, + { "compatible", 'c', NULL, 0, + "Try to be compatible with the Linux procps utilities. " + "Currently equivalent to -h 100 -s 0444 -S 1." }, + { "anonymous-owner", 'a', "USER", 0, + "Make USER the owner of files related to processes without one. " + "Be aware that USER will be granted access to the environment and " + "other sensitive information about the processes in question. " + "(default: use uid 0)" }, + {} + }, + .parser = argp_parser, + .doc = "A virtual filesystem emulating the Linux procfs.", + .children = (struct argp_child []) { + { &netfs_std_startup_argp, }, + {} + }, +}; + +error_t +root_make_node (struct ps_context *pc, struct node **np) +{ + struct node *root_dirs[] = { + proclist_make_node (pc), + rootdir_make_node (pc), + }; + + *np = dircat_make_node (root_dirs, sizeof root_dirs / sizeof root_dirs[0]); + if (! *np) + return ENOMEM; + + /* Since this one is not created through proc_lookup(), we have to affect an + inode number to it. */ + (*np)->nn_stat.st_ino = * (uint32_t *) "PROC"; + + return 0; +} + +int main (int argc, char **argv) +{ + struct ps_context *pc; + mach_port_t bootstrap; + error_t err; + + opt_clk_tck = sysconf(_SC_CLK_TCK); + opt_stat_mode = 0400; + opt_fake_self = -1; + opt_kernel_pid = 2; + opt_anon_owner = 0; + err = argp_parse (&argp, argc, argv, 0, 0, 0); + if (err) + error (1, err, "Could not parse command line"); + + err = ps_context_create (getproc (), &pc); + if (err) + error (1, err, "Could not create libps context"); + + task_get_bootstrap_port (mach_task_self (), &bootstrap); + if (bootstrap == MACH_PORT_NULL) + error (1, 0, "Must be started as a translator"); + + netfs_init (); + err = root_make_node (pc, &netfs_root_node); + if (err) + error (1, err, "Could not create the root node"); + + netfs_startup (bootstrap, 0); + netfs_server_loop (); + + assert (0 /* netfs_server_loop returned after all */); +} + @@ -0,0 +1,25 @@ +/* Hurd /proc filesystem, command-line options set by main.c. + Copyright (C) 2010 Free Software Foundation, Inc. + + This file is part of the GNU Hurd. + + The GNU Hurd is free software; you can redistribute it and/or + modify it under the terms of the GNU General Public License as + published by the Free Software Foundation; either version 2, or (at + your option) any later version. + + The GNU Hurd is distributed in the hope that it will be useful, but + WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ + +/* Startup options */ +extern int opt_clk_tck; +extern mode_t opt_stat_mode; +extern pid_t opt_fake_self; +extern pid_t opt_kernel_pid; +extern uid_t opt_anon_owner; @@ -1,467 +1,445 @@ -/* procfs -- a translator for providing GNU/Linux compatible - proc pseudo-filesystem +/* Hurd /proc filesystem, interface with libnetfs. + Copyright (C) 2010 Free Software Foundation, Inc. - Copyright (C) 2008, FSF. - Written as a Summer of Code Project - - procfs is free software; you can redistribute it and/or + This file is part of the GNU Hurd. + + The GNU Hurd is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2, or (at your option) any later version. - procfs is distributed in the hope that it will be useful, but + The GNU Hurd is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software - Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA. -*/ + Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ -#include <stddef.h> -#include <stdlib.h> -#include <fcntl.h> -#include <unistd.h> +#include <hurd/netfs.h> +#include <hurd/fshelp.h> +#include <sys/mman.h> +#include <mach/vm_param.h> #include <dirent.h> -#include <string.h> +#include <fcntl.h> +#include "procfs.h" -#include <sys/mman.h> -#include <sys/stat.h> -#include <hurd/netfs.h> +#define PROCFS_SERVER_NAME "procfs" +#define PROCFS_SERVER_VERSION "0.1.0" +#define PROCFS_MAXSYMLINKS 16 -#include "procfs.h" + +/* Interesting libnetfs callback functions. */ -/* Trivial definitions. */ +/* The user must define this variable. Set this to the name of the + filesystem server. */ +char *netfs_server_name = PROCFS_SERVER_NAME; -/* Make sure that NP->nn_stat is filled with current information. CRED - identifies the user responsible for the operation. */ -error_t -netfs_validate_stat (struct node *node, struct iouser *cred) -{ - return procfs_refresh_node (node); -} +/* The user must define this variables. Set this to be the server + version number. */ +char *netfs_server_version = PROCFS_SERVER_VERSION; -/* This should sync the file NODE completely to disk, for the user CRED. If - WAIT is set, return only after sync is completely finished. */ -error_t -netfs_attempt_sync (struct iouser *cred, struct node *node, int wait) +/* Maximum number of symlinks to follow before returning ELOOP. */ +int netfs_maxsymlinks = PROCFS_MAXSYMLINKS; + +/* The user must define this function. Make sure that NP->nn_stat is + filled with the most current information. CRED identifies the user + responsible for the operation. NP is locked. */ +error_t netfs_validate_stat (struct node *np, struct iouser *cred) { + char *contents; + ssize_t contents_len; + error_t err; + + /* Only symlinks need to have their size filled, before a read is + attempted. */ + if (! S_ISLNK (np->nn_stat.st_mode)) + return 0; + + err = procfs_get_contents (np, &contents, &contents_len); + if (err) + return err; + + np->nn_stat.st_size = contents_len; return 0; } -/* Attempt to create a new directory named NAME in DIR for USER with mode - MODE. */ -error_t netfs_attempt_mkdir (struct iouser *user, struct node *dir, - char *name, mode_t mode) +/* The user must define this function. Read from the locked file NP + for user CRED starting at OFFSET and continuing for up to *LEN + bytes. Put the data at DATA. Set *LEN to the amount successfully + read upon return. */ +error_t netfs_attempt_read (struct iouser *cred, struct node *np, + loff_t offset, size_t *len, void *data) { - return EROFS; -} + char *contents; + ssize_t contents_len; + error_t err; -/* Attempt to remove directory named NAME in DIR for USER. */ -error_t netfs_attempt_rmdir (struct iouser *user, - struct node *dir, char *name) -{ - return EROFS; -} + if (offset == 0) + procfs_refresh (np); -/* Attempt to set the passive translator record for FILE to ARGZ (of length - ARGZLEN) for user CRED. */ -error_t netfs_set_translator (struct iouser *cred, struct node *node, - char *argz, size_t argzlen) -{ - return EROFS; -} + err = procfs_get_contents (np, &contents, &contents_len); + if (err) + return err; -/* Attempt to create a file named NAME in DIR for USER with MODE. Set *NODE - to the new node upon return. On any error, clear *NODE. *NODE should be - locked on success; no matter what, unlock DIR before returning. */ -error_t -netfs_attempt_create_file (struct iouser *user, struct node *dir, - char *name, mode_t mode, struct node **node) -{ - *node = NULL; - mutex_unlock (&dir->lock); - return EROFS; + contents += offset; + contents_len -= offset; + + if (*len > contents_len) + *len = contents_len; + if (*len < 0) + *len = 0; + + memcpy (data, contents, *len); + return 0; } -/* Node NODE is being opened by USER, with FLAGS. NEWNODE is nonzero if we - just created this node. Return an error if we should not permit the open - to complete because of a permission restriction. */ -error_t -netfs_check_open_permissions (struct iouser *user, struct node *node, - int flags, int newnode) +/* The user must define this function. Read the contents of locked + node NP (a symlink), for USER, into BUF. */ +error_t netfs_attempt_readlink (struct iouser *user, struct node *np, + char *buf) { - error_t err = procfs_refresh_node (node); - if (!err && (flags & O_READ)) - err = fshelp_access (&node->nn_stat, S_IREAD, user); - if (!err && (flags & O_WRITE)) - err = fshelp_access (&node->nn_stat, S_IWRITE, user); - if (!err && (flags & O_EXEC)) - err = fshelp_access (&node->nn_stat, S_IEXEC, user); - return err; + char *contents; + ssize_t contents_len; + error_t err; + + err = procfs_get_contents (np, &contents, &contents_len); + if (err) + return err; + + assert (contents_len == np->nn_stat.st_size); + memcpy (buf, contents, contents_len); + return 0; } -/* This should attempt a utimes call for the user specified by CRED on node - NODE, to change the atime to ATIME and the mtime to MTIME. */ -error_t -netfs_attempt_utimes (struct iouser *cred, struct node *node, - struct timespec *atime, struct timespec *mtime) +/* Helper function for netfs_get_dirents() below. CONTENTS is an argz + vector of directory entry names, as returned by procfs_get_contents(). + Convert at most NENTRIES of them to dirent structures, put them in + DATA (if not NULL), write the number of entries processed in *AMT and + return the required/used space in DATACNT. */ +static int putentries (char *contents, size_t contents_len, int nentries, + char *data, mach_msg_type_number_t *datacnt) { - error_t err = procfs_refresh_node (node); - int flags = TOUCH_CTIME; - - if (! err) - err = fshelp_isowner (&node->nn_stat, cred); + int i; - if (! err) + *datacnt = 0; + for (i = 0; contents_len && (nentries < 0 || i < nentries); i++) { - if (atime) - node->nn_stat.st_atim = *atime; - else - flags |= TOUCH_ATIME; + int namlen = strlen (contents); + int reclen = sizeof (struct dirent) + namlen; - if (mtime) - node->nn_stat.st_mtim = *mtime; - else - flags |= TOUCH_MTIME; - - fshelp_touch (&node->nn_stat, flags, procfs_maptime); + if (data) + { + struct dirent *d = (struct dirent *) (data + *datacnt); + d->d_fileno = 42; /* XXX */ + d->d_namlen = namlen; + d->d_reclen = reclen; + d->d_type = DT_UNKNOWN; + strcpy (d->d_name, contents); + } + + *datacnt += reclen; + contents += namlen + 1; + contents_len -= namlen + 1; } - return err; + return i; } -/* Return the valid access types (bitwise OR of O_READ, O_WRITE, and O_EXEC) - in *TYPES for file NODE and user CRED. */ -error_t -netfs_report_access (struct iouser *cred, struct node *node, int *types) +/* The user must define this function. Fill the array *DATA of size + BUFSIZE with up to NENTRIES dirents from DIR (which is locked) + starting with entry ENTRY for user CRED. The number of entries in + the array is stored in *AMT and the number of bytes in *DATACNT. + If the supplied buffer is not large enough to hold the data, it + should be grown. */ +error_t netfs_get_dirents (struct iouser *cred, struct node *dir, + int entry, int nentries, char **data, + mach_msg_type_number_t *datacnt, + vm_size_t bufsize, int *amt) { - error_t err = procfs_refresh_node (node); + char *contents; + ssize_t contents_len; + error_t err; - if (! err) - { - *types = 0; - if (fshelp_access (&node->nn_stat, S_IREAD, cred) == 0) - *types |= O_READ; - if (fshelp_access (&node->nn_stat, S_IWRITE, cred) == 0) - *types |= O_WRITE; - if (fshelp_access (&node->nn_stat, S_IEXEC, cred) == 0) - *types |= O_EXEC; - } + if (entry == 0) + procfs_refresh (dir); + + err = procfs_get_contents (dir, &contents, &contents_len); + if (err) + return err; - return err; -} + /* We depend on the fact that CONTENTS is terminated. */ + assert (contents_len == 0 || contents[contents_len - 1] == '\0'); -/* The granularity with which we allocate space to return our result. */ -#define DIRENTS_CHUNK_SIZE (8*1024) + /* Skip to the first requested entry. */ + while (contents_len && entry--) + { + int ofs = strlen (contents) + 1; + contents += ofs; + contents_len -= ofs; + } -/* Returned directory entries are aligned to blocks this many bytes long. - Must be a power of two. */ -#define DIRENT_ALIGN 4 -#define DIRENT_NAME_OFFS offsetof (struct dirent, d_name) + /* Allocate a buffer if necessary. */ + putentries (contents, contents_len, nentries, NULL, datacnt); + if (bufsize < *datacnt) + { + char *n = mmap (0, *datacnt, PROT_READ | PROT_WRITE, MAP_ANONYMOUS, 0, 0); + if (n == MAP_FAILED) + return ENOMEM; -/* Length is structure before the name + the name + '\0', all - padded to a four-byte alignment. */ -#define DIRENT_LEN(name_len) \ - ((DIRENT_NAME_OFFS + (name_len) + 1 + (DIRENT_ALIGN - 1)) \ - & ~(DIRENT_ALIGN - 1)) + *data = n; + } + /* Do the actual conversion. */ + *amt = putentries (contents, contents_len, nentries, *data, datacnt); + return 0; +} -/* Fetch a directory */ -error_t -netfs_get_dirents (struct iouser *cred, struct node *dir, - int first_entry, int max_entries, char **data, - mach_msg_type_number_t *data_len, - vm_size_t max_data_len, int *data_entries) +/* The user must define this function. Lookup NAME in DIR (which is + locked) for USER; set *NP to the found name upon return. If the + name was not found, then return ENOENT. On any error, clear *NP. + (*NP, if found, should be locked and a reference to it generated. + This call should unlock DIR no matter what.) */ +error_t netfs_attempt_lookup (struct iouser *user, struct node *dir, + char *name, struct node **np) { - error_t err = procfs_refresh_node (dir); - struct procfs_dir_entry *dir_entry; + error_t err; + + err = procfs_lookup (dir, name, np); + mutex_unlock (&dir->lock); if (! err) - { - if (dir->nn->dir) - { - if (! procfs_dir_refresh (dir->nn->dir, dir == dir->nn->fs->root)) - { - for (dir_entry = dir->nn->dir->ordered; first_entry > 0 && - dir_entry; first_entry--, - dir_entry = dir_entry->ordered_next); - if (! dir_entry ) - max_entries = 0; - - if (max_entries != 0) - { - size_t size = 0; - char *p; - int count = 0; - - - if (max_data_len == 0) - size = DIRENTS_CHUNK_SIZE; - else if (max_data_len > DIRENTS_CHUNK_SIZE) - size = DIRENTS_CHUNK_SIZE; - else - size = max_data_len; - - *data = mmap (0, size, PROT_READ|PROT_WRITE, - MAP_ANON, 0, 0); - - err = ((void *) *data == (void *) -1) ? errno : 0; - - if (! err) - { - p = *data; - - /* This gets all the actual entries present. */ - - while ((max_entries == -1 || count < max_entries) && dir_entry) - { - struct dirent hdr; - size_t name_len = strlen (dir_entry->name); - size_t sz = DIRENT_LEN (name_len); - int entry_type = IFTODT (dir_entry->stat.st_mode); - - if ((p - *data) + sz > size) - { - if (max_data_len > 0) - break; - else /* The Buffer Size must be increased. */ - { - vm_address_t extension = (vm_address_t)(*data + size); - err = vm_allocate (mach_task_self (), &extension, - DIRENTS_CHUNK_SIZE, 0); - - if (err) - break; - - size += DIRENTS_CHUNK_SIZE; - } - } - - hdr.d_namlen = name_len; - hdr.d_fileno = dir_entry->stat.st_ino; - hdr.d_reclen = sz; - hdr.d_type = entry_type; - - memcpy (p, &hdr, DIRENT_NAME_OFFS); - strcpy (p + DIRENT_NAME_OFFS, dir_entry->name); - - p += sz; - - count++; - dir_entry = dir_entry->ordered_next; - } - - if (err) - munmap (*data, size); - else - { - vm_address_t alloc_end = (vm_address_t)(*data + size); - vm_address_t real_end = round_page (p); - if (alloc_end > real_end) - munmap ((caddr_t) real_end, alloc_end - real_end); - *data_len = p - *data; - *data_entries = count; - } - } - } - else - { - *data_len = 0; - *data_entries = 0; - } - } - } - else - return ENOTDIR; - } - - procfs_dir_entries_remove (dir->nn->dir); + mutex_lock (&(*np)->lock); + return err; -} +} -/* Lookup NAME in DIR for USER; set *NODE to the found name upon return. If - the name was not found, then return ENOENT. On any error, clear *NODE. - (*NODE, if found, should be locked, this call should unlock DIR no matter - what.) */ -error_t netfs_attempt_lookup (struct iouser *user, struct node *dir, - char *name, struct node **node) +/* The user must define this function. Node NP has no more references; + free all its associated storage. */ +void netfs_node_norefs (struct node *np) { - error_t err = procfs_refresh_node (dir); + spin_unlock (&netfs_node_refcnt_lock); - if (! err) - err = procfs_dir_lookup (dir->nn->dir, name, node); + procfs_cleanup (np); + free (np); - return err; + spin_lock (&netfs_node_refcnt_lock); } -/* Delete NAME in DIR for USER. */ -error_t netfs_attempt_unlink (struct iouser *user, struct node *dir, - char *name) + +/* Libnetfs callbacks managed with libfshelp. */ + +/* The user must define this function. Locked node NP is being opened + by USER, with FLAGS. NEWNODE is nonzero if we just created this + node. Return an error if we should not permit the open to complete + because of a permission restriction. */ +error_t netfs_check_open_permissions (struct iouser *user, struct node *np, + int flags, int newnode) { - return EROFS; + error_t err = 0; + if (!err && (flags & O_READ)) + err = fshelp_access (&np->nn_stat, S_IREAD, user); + if (!err && (flags & O_WRITE)) + err = fshelp_access (&np->nn_stat, S_IWRITE, user); + if (!err && (flags & O_EXEC)) + err = fshelp_access (&np->nn_stat, S_IEXEC, user); + return err; } -/* Note that in this one call, neither of the specific nodes are locked. */ -error_t netfs_attempt_rename (struct iouser *user, struct node *fromdir, - char *fromname, struct node *todir, - char *toname, int excl) +/* The user must define this function. Return the valid access + types (bitwise OR of O_READ, O_WRITE, and O_EXEC) in *TYPES for + locked file NP and user CRED. */ +error_t netfs_report_access (struct iouser *cred, struct node *np, + int *types) { - return EROFS; + *types = 0; + if (fshelp_access (&np->nn_stat, S_IREAD, cred) == 0) + *types |= O_READ; + if (fshelp_access (&np->nn_stat, S_IWRITE, cred) == 0) + *types |= O_WRITE; + if (fshelp_access (&np->nn_stat, S_IEXEC, cred) == 0) + *types |= O_EXEC; + return 0; } -/* This should attempt a chmod call for the user specified by CRED on node - NODE, to change the owner to UID and the group to GID. */ -error_t netfs_attempt_chown (struct iouser *cred, struct node *node, + +/* Trivial or unsupported libnetfs callbacks. */ + +/* The user must define this function. This should attempt a chmod + call for the user specified by CRED on locked node NP, to change + the owner to UID and the group to GID. */ +error_t netfs_attempt_chown (struct iouser *cred, struct node *np, uid_t uid, uid_t gid) { return EROFS; } -/* This should attempt a chauthor call for the user specified by CRED on node - NODE, to change the author to AUTHOR. */ -error_t netfs_attempt_chauthor (struct iouser *cred, struct node *node, +/* The user must define this function. This should attempt a chauthor + call for the user specified by CRED on locked node NP, thereby + changing the author to AUTHOR. */ +error_t netfs_attempt_chauthor (struct iouser *cred, struct node *np, uid_t author) { return EROFS; } -/* This should attempt a chmod call for the user specified by CRED on node - NODE, to change the mode to MODE. Unlike the normal Unix and Hurd meaning - of chmod, this function is also used to attempt to change files into other - types. If such a transition is attempted which is impossible, then return - EOPNOTSUPP. */ -error_t netfs_attempt_chmod (struct iouser *cred, struct node *node, +/* The user must define this function. This should attempt a chmod + call for the user specified by CRED on locked node NODE, to change + the mode to MODE. Unlike the normal Unix and Hurd meaning of + chmod, this function is also used to attempt to change files into + other types. If such a transition is attempted which is + impossible, then return EOPNOTSUPP. */ +error_t netfs_attempt_chmod (struct iouser *cred, struct node *np, mode_t mode) { return EROFS; } -/* Attempt to turn NODE (user CRED) into a symlink with target NAME. */ -error_t netfs_attempt_mksymlink (struct iouser *cred, struct node *node, +/* The user must define this function. Attempt to turn locked node NP + (user CRED) into a symlink with target NAME. */ +error_t netfs_attempt_mksymlink (struct iouser *cred, struct node *np, char *name) { return EROFS; } -/* Attempt to turn NODE (user CRED) into a device. TYPE is either S_IFBLK or - S_IFCHR. */ -error_t netfs_attempt_mkdev (struct iouser *cred, struct node *node, +/* The user must define this function. Attempt to turn NODE (user + CRED) into a device. TYPE is either S_IFBLK or S_IFCHR. NP is + locked. */ +error_t netfs_attempt_mkdev (struct iouser *cred, struct node *np, mode_t type, dev_t indexes) { return EROFS; } - -/* This should attempt a chflags call for the user specified by CRED on node - NODE, to change the flags to FLAGS. */ -error_t netfs_attempt_chflags (struct iouser *cred, struct node *node, +/* The user must define this function. This should attempt a chflags + call for the user specified by CRED on locked node NP, to change + the flags to FLAGS. */ +error_t netfs_attempt_chflags (struct iouser *cred, struct node *np, int flags) { return EROFS; } -/* This should attempt to set the size of the file NODE (for user CRED) to - SIZE bytes long. */ -error_t netfs_attempt_set_size (struct iouser *cred, struct node *node, - off_t size) +/* The user must define this function. This should attempt a utimes + call for the user specified by CRED on locked node NP, to change + the atime to ATIME and the mtime to MTIME. If ATIME or MTIME is + null, then set to the current time. */ +error_t netfs_attempt_utimes (struct iouser *cred, struct node *np, + struct timespec *atime, struct timespec *mtime) +{ + return EROFS; +} + +/* The user must define this function. This should attempt to set the + size of the locked file NP (for user CRED) to SIZE bytes long. */ +error_t netfs_attempt_set_size (struct iouser *cred, struct node *np, + loff_t size) { return EROFS; } -/* This should attempt to fetch filesystem status information for the remote - filesystem, for the user CRED. */ -error_t -netfs_attempt_statfs (struct iouser *cred, struct node *node, - struct statfs *st) +/* The user must define this function. This should attempt to fetch + filesystem status information for the remote filesystem, for the + user CRED. NP is locked. */ +error_t netfs_attempt_statfs (struct iouser *cred, struct node *np, + fsys_statfsbuf_t *st) +{ + return ENOSYS; +} + +/* The user must define this function. This should sync the locked + file NP completely to disk, for the user CRED. If WAIT is set, + return only after the sync is completely finished. */ +error_t netfs_attempt_sync (struct iouser *cred, struct node *np, + int wait) { - bzero (st, sizeof *st); - st->f_type = PROCFILESYSTEM; - st->f_fsid = getpid (); return 0; } -/* This should sync the entire remote filesystem. If WAIT is set, return - only after sync is completely finished. */ +/* The user must define this function. This should sync the entire + remote filesystem. If WAIT is set, return only after the sync is + completely finished. */ error_t netfs_attempt_syncfs (struct iouser *cred, int wait) { return 0; } -/* Create a link in DIR with name NAME to FILE for USER. Note that neither - DIR nor FILE are locked. If EXCL is set, do not delete the target, but - return EEXIST if NAME is already found in DIR. */ -error_t netfs_attempt_link (struct iouser *user, struct node *dir, - struct node *file, char *name, int excl) +/* The user must define this function. Delete NAME in DIR (which is + locked) for USER. */ +error_t netfs_attempt_unlink (struct iouser *user, struct node *dir, + char *name) { return EROFS; } -/* Attempt to create an anonymous file related to DIR for USER with MODE. - Set *NODE to the returned file upon success. No matter what, unlock DIR. */ -error_t netfs_attempt_mkfile (struct iouser *user, struct node *dir, - mode_t mode, struct node **node) +/* The user must define this function. Attempt to rename the + directory FROMDIR to TODIR. Note that neither of the specific nodes + are locked. */ +error_t netfs_attempt_rename (struct iouser *user, struct node *fromdir, + char *fromname, struct node *todir, + char *toname, int excl) { - *node = NULL; - mutex_unlock (&dir->lock); return EROFS; } -/* Read the contents of NODE (a symlink), for USER, into BUF. */ -error_t netfs_attempt_readlink (struct iouser *user, struct node *node, char *buf) +/* The user must define this function. Attempt to create a new + directory named NAME in DIR (which is locked) for USER with mode + MODE. */ +error_t netfs_attempt_mkdir (struct iouser *user, struct node *dir, + char *name, mode_t mode) { - error_t err = procfs_refresh_node (node); - if (! err) - { - struct procfs_dir_entry *dir_entry = node->nn->dir_entry; - if (dir_entry) - bcopy (dir_entry->symlink_target, buf, node->nn_stat.st_size); - else - err = EINVAL; - } - return err; + return EROFS; } -/* Read from the file NODE for user CRED starting at OFFSET and continuing for - up to *LEN bytes. Put the data at DATA. Set *LEN to the amount - successfully read upon return. */ -error_t netfs_attempt_read (struct iouser *cred, struct node *node, - off_t offset, size_t *len, void *data) +/* The user must define this function. Attempt to remove directory + named NAME in DIR (which is locked) for USER. */ +error_t netfs_attempt_rmdir (struct iouser *user, + struct node *dir, char *name) { - error_t err; - err = procfs_refresh_node (node); + return EROFS; +} - if (! err) - { - if (*len > 0) - procfs_read_files_contents (node, offset, - len, data); - if (*len > 0) - if (offset >= *len) - *len = 0; - } - return err; +/* The user must define this function. Create a link in DIR with name + NAME to FILE for USER. Note that neither DIR nor FILE are + locked. If EXCL is set, do not delete the target. Return EEXIST if + NAME is already found in DIR. */ +error_t netfs_attempt_link (struct iouser *user, struct node *dir, + struct node *file, char *name, int excl) +{ + return EROFS; +} + +/* The user must define this function. Attempt to create an anonymous + file related to DIR (which is locked) for USER with MODE. Set *NP + to the returned file upon success. No matter what, unlock DIR. */ +error_t netfs_attempt_mkfile (struct iouser *user, struct node *dir, + mode_t mode, struct node **np) +{ + return EROFS; } -/* Write to the file NODE for user CRED starting at OFFSET and continuing for up - to *LEN bytes from DATA. Set *LEN to the amount seccessfully written upon - return. */ -error_t netfs_attempt_write (struct iouser *cred, struct node *node, - off_t offset, size_t *len, void *data) +/* The user must define this function. Attempt to create a file named + NAME in DIR (which is locked) for USER with MODE. Set *NP to the + new node upon return. On any error, clear *NP. *NP should be + locked on success; no matter what, unlock DIR before returning. */ +error_t netfs_attempt_create_file (struct iouser *user, struct node *dir, + char *name, mode_t mode, struct node **np) { return EROFS; } -/* The user must define this function. Node NP is all done; free - all its associated storage. */ -void netfs_node_norefs (struct node *np) +/* The user must define this function. Write to the locked file NP + for user CRED starting at OFSET and continuing for up to *LEN bytes + from DATA. Set *LEN to the amount successfully written upon + return. */ +error_t netfs_attempt_write (struct iouser *cred, struct node *np, + loff_t offset, size_t *len, void *data) { - mutex_lock (&np->lock); - *np->prevp = np->next; - np->next->prevp = np->prevp; - procfs_remove_node (np); + return EROFS; } + @@ -1,195 +0,0 @@ -/* procfs -- a translator for providing GNU/Linux compatible - proc pseudo-filesystem - - node.c -- This file contains function defintions to handle - node creation and destruction. - - Copyright (C) 2008, FSF. - Written as a Summer of Code Project - - procfs is free software; you can redistribute it and/or - modify it under the terms of the GNU General Public License as - published by the Free Software Foundation; either version 2, or (at - your option) any later version. - - procfs is distributed in the hope that it will be useful, but - WITHOUT ANY WARRANTY; without even the implied warranty of - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - General Public License for more details. - - You should have received a copy of the GNU General Public License - along with this program; if not, write to the Free Software - Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA. -*/ -#include <stdio.h> -#include <stdlib.h> -#include <fcntl.h> -#include <string.h> -#include <errno.h> -#include <hurd/ihash.h> -#include <hurd/fshelp.h> -#include <hurd/iohelp.h> - -#include <hurd/netfs.h> - -#include "procfs.h" - -/* Return a new node in NODE, with a name NAME, and return the - new node with a single reference in NODE. */ -error_t procfs_create_node (struct procfs_dir_entry *dir_entry, - const char *fs_path, struct node **node) -{ - struct node *new; - struct netnode *nn = malloc (sizeof (struct netnode)); - error_t err; - - if (! nn) - return ENOMEM; - if (! fs_path) - fs_path = strdup (""); - nn->fs = dir_entry->dir->fs; - nn->dir_entry = dir_entry; - nn->dir = NULL; - nn->fs_path = strdup (fs_path); - - new = netfs_make_node (nn); - if (! new) - { - free (nn); - return ENOMEM; - } - - fshelp_touch (&new->nn_stat, TOUCH_ATIME|TOUCH_MTIME|TOUCH_CTIME, - procfs_maptime); - - spin_lock (&nn->fs->inode_mappings_lock); - err = hurd_ihash_add (&nn->fs->inode_mappings, dir_entry->stat.st_ino, dir_entry); - spin_unlock (&nn->fs->inode_mappings_lock); - - if (err) - { - free (nn); - free (new); - return err; - } - - dir_entry->node = new; - *node = new; - - return 0; -} - -/* Update the directory entry for NAME to reflect ST and SYMLINK_TARGET. - True is returned if successful, or false if there was a memory allocation - error. TIMESTAMP is used to record the time of this update. */ -static void -update_entry (struct procfs_dir_entry *dir_entry, const struct stat *st, - const char *symlink_target, time_t timestamp) -{ - ino_t ino; - struct procfs *fs = dir_entry->dir->fs; - - if (dir_entry->stat.st_ino) - ino = dir_entry->stat.st_ino; - else - ino = fs->next_inode++; - - dir_entry->name_timestamp = timestamp; - - if (st) - /* The ST and SYMLINK_TARGET parameters are only valid if ST isn't 0. */ - { - dir_entry->stat = *st; - dir_entry->stat_timestamp = timestamp; - - if (!dir_entry->symlink_target || !symlink_target - || strcmp (dir_entry->symlink_target, symlink_target) != 0) - { - if (dir_entry->symlink_target) - free (dir_entry->symlink_target); - dir_entry->symlink_target = symlink_target ? strdup (symlink_target) : 0; - } - } - - /* The st_ino field is always valid. */ - dir_entry->stat.st_ino = ino; - dir_entry->stat.st_fsid = fs->fsid; - dir_entry->stat.st_fstype = PROCFILESYSTEM; -} - -/* Refresh stat information for NODE */ -error_t procfs_refresh_node (struct node *node) -{ - struct netnode *nn = node->nn; - struct procfs_dir_entry *dir_entry = nn->dir_entry; - - if (! dir_entry) - /* This is a deleted node, don't attempt to do anything. */ - return 0; - else - { - error_t err = 0; - - struct timeval tv; - maptime_read (procfs_maptime, &tv); - - time_t timestamp = tv.tv_sec; - - struct procfs_dir *dir = dir_entry->dir; - - mutex_lock (&dir->node->lock); - - if (! dir_entry->self_p) - /* This is a deleted entry, just awaiting disposal; do so. */ - { -#if 0 - nn->dir_entry = 0; - free_entry (dir_entry); - return 0; -#endif - } - - else if (dir_entry->noent) - err = ENOENT; - else - { - if (*(dir_entry->name)) - { - err = procfs_dir_refresh (dir_entry->dir, - dir_entry->dir->node == dir_entry->dir->fs->root); - if (!err && dir_entry->noent) - err = ENOENT; - - if (err == ENOENT) - { - dir_entry->noent = 1; /* A negative entry. */ - dir_entry->name_timestamp = timestamp; - } - } - else - { - /* Refresh the root node with the old stat - information. */ - update_entry (dir_entry, &netfs_root_node->nn_stat, NULL, timestamp); - } - } - - node->nn_stat = dir_entry->stat; - node->nn_translated = S_ISLNK (dir_entry->stat.st_mode) ? S_IFLNK : 0; - if (!nn->dir && S_ISDIR (dir_entry->stat.st_mode)) - procfs_dir_create (nn->fs, node, nn->fs_path, &nn->dir); - - mutex_unlock (&dir->node->lock); - - return err; - } -} - -/* Remove NODE from its entry */ -error_t procfs_remove_node (struct node *node) -{ - - /* STUB */ - - return 0; -} diff --git a/process.c b/process.c new file mode 100644 index 0000000..17a38ea --- /dev/null +++ b/process.c @@ -0,0 +1,393 @@ +/* Hurd /proc filesystem, implementation of process directories. + Copyright (C) 2010 Free Software Foundation, Inc. + + This file is part of the GNU Hurd. + + The GNU Hurd is free software; you can redistribute it and/or + modify it under the terms of the GNU General Public License as + published by the Free Software Foundation; either version 2, or (at + your option) any later version. + + The GNU Hurd is distributed in the hope that it will be useful, but + WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ + +#include <stdio.h> +#include <stdlib.h> +#include <unistd.h> +#include <hurd/process.h> +#include <hurd/resource.h> +#include <mach/vm_param.h> +#include <ps.h> +#include "procfs.h" +#include "procfs_dir.h" +#include "process.h" +#include "main.h" + +/* This module implements the process directories and the files they + contain. A libps proc_stat structure is created for each process + node, and is used by the individual file content generators as a + source of information. Each possible file (cmdline, environ, ...) is + decribed in a process_file_desc structure, which specifies which bits + of information (ie. libps flags) it needs, and what function should + be used to generate the file's contents. + + The content generators are defined first, followed by glue logic and + entry table. */ + + +/* Helper functions */ + +static char state_char (struct proc_stat *ps) +{ + int i; + + for (i = 0; (1 << i) & (PSTAT_STATE_P_STATES | PSTAT_STATE_T_STATES); i++) + if (proc_stat_state (ps) & (1 << i)) + return proc_stat_state_tags[i]; + + return '?'; +} + +static const char *state_string (struct proc_stat *ps) +{ + static const char *const state_strings[] = { + "T (stopped)", + "Z (zombie)", + "R (running)", + "H (halted)", + "D (disk sleep)", + "S (sleeping)", + "I (idle)", + NULL + }; + int i; + + for (i = 0; state_strings[i]; i++) + if (proc_stat_state (ps) & (1 << i)) + return state_strings[i]; + + return "? (unknown)"; +} + +static long long int timeval_jiffies (time_value_t tv) +{ + double secs = tv.seconds * 1000000. + tv.microseconds; + return secs * opt_clk_tck / 1000000.; +} + +static const char *args_filename (const char *name) +{ + char *sp = strrchr (name, '/'); + return sp != NULL && *(sp + 1) != '\0' ? sp + 1 : name; +} + +/* Actual content generators */ + +static ssize_t +process_file_gc_cmdline (struct proc_stat *ps, char **contents) +{ + *contents = proc_stat_args(ps); + return proc_stat_args_len(ps); +} + +static ssize_t +process_file_gc_environ (struct proc_stat *ps, char **contents) +{ + *contents = proc_stat_env(ps); + return proc_stat_env_len(ps); +} + +static ssize_t +process_file_gc_stat (struct proc_stat *ps, char **contents) +{ + struct procinfo *pi = proc_stat_proc_info (ps); + task_basic_info_t tbi = proc_stat_task_basic_info (ps); + thread_basic_info_t thbi = proc_stat_thread_basic_info (ps); + + /* See proc(5) for more information about the contents of each field for the + Linux procfs. */ + return asprintf (contents, + "%d (%s) %c " /* pid, command, state */ + "%d %d %d " /* ppid, pgid, session */ + "%d %d " /* controling tty stuff */ + "%u " /* flags, as defined by <linux/sched.h> */ + "%lu %lu %lu %lu " /* page fault counts */ + "%lu %lu %ld %ld " /* user/sys times, in sysconf(_SC_CLK_TCK) */ + "%d %d " /* scheduler params (priority, nice) */ + "%d %ld " /* number of threads, [obsolete] */ + "%llu " /* start time since boot (jiffies) */ + "%lu %ld %lu " /* virtual size (bytes), rss (pages), rss lim */ + "%lu %lu %lu %lu %lu " /* some vm addresses (code, stack, sp, pc) */ + "%lu %lu %lu %lu " /* pending, blocked, ignored and caught sigs */ + "%lu " /* wait channel */ + "%lu %lu " /* swap usage (not maintained in Linux) */ + "%d " /* exit signal, to be sent to the parent */ + "%d " /* last processor used */ + "%u %u " /* RT priority and policy */ + "%llu " /* aggregated block I/O delay */ + "\n", + proc_stat_pid (ps), args_filename (proc_stat_args (ps)), state_char (ps), + pi->ppid, pi->pgrp, pi->session, + 0, 0, /* no such thing as a major:minor for ctty */ + 0, /* no such thing as CLONE_* flags on Hurd */ + 0L, 0L, 0L, 0L, /* TASK_EVENTS_INFO is unavailable on GNU Mach */ + (long unsigned) timeval_jiffies (thbi->user_time), + (long unsigned) timeval_jiffies (thbi->system_time), + 0L, 0L, /* cumulative time for children */ + MACH_PRIORITY_TO_NICE(thbi->base_priority) + 20, + MACH_PRIORITY_TO_NICE(thbi->base_priority), + pi->nthreads, 0L, + timeval_jiffies (thbi->creation_time), /* FIXME: ... since boot */ + (long unsigned) tbi->virtual_size, + (long unsigned) tbi->resident_size / PAGE_SIZE, 0L, + 0L, 0L, 0L, 0L, 0L, + 0L, 0L, 0L, 0L, + (long unsigned) proc_stat_thread_rpc (ps), /* close enough */ + 0L, 0L, + 0, + 0, + 0, 0, + 0LL); +} + +static ssize_t +process_file_gc_statm (struct proc_stat *ps, char **contents) +{ + task_basic_info_t tbi = proc_stat_task_basic_info (ps); + + return asprintf (contents, + "%lu %lu 0 0 0 0 0\n", + tbi->virtual_size / sysconf(_SC_PAGE_SIZE), + tbi->resident_size / sysconf(_SC_PAGE_SIZE)); +} + +static ssize_t +process_file_gc_status (struct proc_stat *ps, char **contents) +{ + task_basic_info_t tbi = proc_stat_task_basic_info (ps); + + return asprintf (contents, + "Name:\t%s\n" + "State:\t%s\n" + "Tgid:\t%u\n" + "Pid:\t%u\n" + "PPid:\t%u\n" + "Uid:\t%u\t%u\t%u\t%u\n" + "VmSize:\t%8u kB\n" + "VmPeak:\t%8u kB\n" + "VmRSS:\t%8u kB\n" + "VmHWM:\t%8u kB\n" /* ie. resident peak */ + "Threads:\t%u\n", + args_filename (proc_stat_args (ps)), + state_string (ps), + proc_stat_pid (ps), /* XXX will need more work for threads */ + proc_stat_pid (ps), + proc_stat_proc_info (ps)->ppid, + proc_stat_owner_uid (ps), + proc_stat_owner_uid (ps), + proc_stat_owner_uid (ps), + proc_stat_owner_uid (ps), + tbi->virtual_size / 1024, + tbi->virtual_size / 1024, + tbi->resident_size / 1024, + tbi->resident_size / 1024, + proc_stat_num_threads (ps)); +} + + +/* Implementation of the file nodes. */ + +/* Describes a file in the process directories. This structure is + filled in as an "entry hook" in our procfs_dir entry table and is + passed to the process_file_make_node function defined below. */ +struct process_file_desc +{ + /* The proc_stat information required to get the contents of this file. */ + ps_flags_t needs; + + /* Content generator to use for this file. Once we have acquired the + necessary information, there can be only memory allocation errors, + hence this simplified signature. */ + ssize_t (*get_contents) (struct proc_stat *ps, char **contents); + + /* The cmdline and environ contents don't need any cleaning since they + point directly into the proc_stat structure. */ + int no_cleanup; + + /* If specified, the file mode to be set with procfs_node_chmod(). */ + mode_t mode; +}; + +struct process_file_node +{ + const struct process_file_desc *desc; + struct proc_stat *ps; +}; + +/* FIXME: lock the parent! */ +static error_t +process_file_get_contents (void *hook, char **contents, ssize_t *contents_len) +{ + struct process_file_node *file = hook; + error_t err; + + /* Fetch the required information. */ + err = proc_stat_set_flags (file->ps, file->desc->needs); + if (err) + return EIO; + if ((proc_stat_flags (file->ps) & file->desc->needs) != file->desc->needs) + return EIO; + + /* Call the actual content generator (see the definitions below). */ + *contents_len = file->desc->get_contents (file->ps, contents); + return 0; +} + +static void +process_file_cleanup_contents (void *hook, char *contents, ssize_t len) +{ + struct process_file_node *file = hook; + + if (! file->desc->no_cleanup) + free (contents); +} + +static struct node * +process_file_make_node (void *dir_hook, const void *entry_hook) +{ + static const struct procfs_node_ops ops = { + .get_contents = process_file_get_contents, + .cleanup_contents = process_file_cleanup_contents, + .cleanup = free, + }; + struct process_file_node *f; + struct node *np; + + f = malloc (sizeof *f); + if (! f) + return NULL; + + f->desc = entry_hook; + f->ps = dir_hook; + + np = procfs_make_node (&ops, f); + if (! np) + return NULL; + + procfs_node_chown (np, proc_stat_owner_uid (f->ps)); + if (f->desc->mode) + procfs_node_chmod (np, f->desc->mode); + + return np; +} + +/* Stat needs its own constructor in oreder to set its mode according to + the --stat-mode command-line option. */ +static struct node * +process_stat_make_node (void *dir_hook, const void *entry_hook) +{ + struct node *np = process_file_make_node (dir_hook, entry_hook); + if (np) procfs_node_chmod (np, opt_stat_mode); + return np; +} + + +/* Implementation of the process directory per se. */ + +static struct procfs_dir_entry entries[] = { + { + .name = "cmdline", + .hook = & (struct process_file_desc) { + .get_contents = process_file_gc_cmdline, + .needs = PSTAT_ARGS, + .no_cleanup = 1, + }, + }, + { + .name = "environ", + .hook = & (struct process_file_desc) { + .get_contents = process_file_gc_environ, + .needs = PSTAT_ENV, + .no_cleanup = 1, + .mode = 0400, + }, + }, + { + .name = "stat", + .hook = & (struct process_file_desc) { + .get_contents = process_file_gc_stat, + .needs = PSTAT_PID | PSTAT_ARGS | PSTAT_STATE | PSTAT_PROC_INFO + | PSTAT_TASK | PSTAT_TASK_BASIC | PSTAT_THREAD_BASIC + | PSTAT_THREAD_WAIT, + }, + .ops = { + .make_node = process_stat_make_node, + } + }, + { + .name = "statm", + .hook = & (struct process_file_desc) { + .get_contents = process_file_gc_statm, + .needs = PSTAT_TASK_BASIC, + }, + }, + { + .name = "status", + .hook = & (struct process_file_desc) { + .get_contents = process_file_gc_status, + .needs = PSTAT_PID | PSTAT_ARGS | PSTAT_STATE | PSTAT_PROC_INFO + | PSTAT_TASK_BASIC | PSTAT_OWNER_UID | PSTAT_NUM_THREADS, + }, + }, + {} +}; + +error_t +process_lookup_pid (struct ps_context *pc, pid_t pid, struct node **np) +{ + static const struct procfs_dir_ops dir_ops = { + .entries = entries, + .cleanup = (void (*)(void *)) _proc_stat_free, + .entry_ops = { + .make_node = process_file_make_node, + }, + }; + struct proc_stat *ps; + int owner; + error_t err; + + err = _proc_stat_create (pid, pc, &ps); + if (err == ESRCH) + return ENOENT; + if (err) + return EIO; + + err = proc_stat_set_flags (ps, PSTAT_OWNER_UID); + if (err || ! (proc_stat_flags (ps) & PSTAT_OWNER_UID)) + { + _proc_stat_free (ps); + return EIO; + } + + /* FIXME: have a separate proc_desc structure for each file, so this can be + accessed in a more robust and straightforward way. */ + ((struct process_file_desc *) entries[2].hook)->mode = opt_stat_mode; + + /* FIXME: have a separate proc_desc structure for each file, so this can be + accessed in a more robust and straightforward way. */ + ((struct process_file_desc *) entries[2].hook)->mode = opt_stat_mode; + + *np = procfs_dir_make_node (&dir_ops, ps); + if (! *np) + return ENOMEM; + + owner = proc_stat_owner_uid (ps); + procfs_node_chown (*np, owner >= 0 ? owner : opt_anon_owner); + return 0; +} diff --git a/process.h b/process.h new file mode 100644 index 0000000..b230a28 --- /dev/null +++ b/process.h @@ -0,0 +1,27 @@ +/* Hurd /proc filesystem, implementation of process directories. + Copyright (C) 2010 Free Software Foundation, Inc. + + This file is part of the GNU Hurd. + + The GNU Hurd is free software; you can redistribute it and/or + modify it under the terms of the GNU General Public License as + published by the Free Software Foundation; either version 2, or (at + your option) any later version. + + The GNU Hurd is distributed in the hope that it will be useful, but + WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ + +#include <ps.h> + +/* Create a node for a directory representing the given PID, as published by + the proc server refrenced by the libps context PC. On success, returns the + newly created node in *NP. */ +error_t +process_lookup_pid (struct ps_context *pc, pid_t pid, struct node **np); + @@ -1,149 +1,203 @@ -/* procfs -- a translator for providing GNU/Linux compatible - proc pseudo-filesystem - - procfs.c -- This file is the main file of the translator. - This has important definitions and initializes - the translator - - Copyright (C) 2008, FSF. - Written as a Summer of Code Project - - procfs is free software; you can redistribute it and/or +/* Hurd /proc filesystem, basic infrastructure. + Copyright (C) 2010 Free Software Foundation, Inc. + + This file is part of the GNU Hurd. + + The GNU Hurd is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2, or (at your option) any later version. - procfs is distributed in the hope that it will be useful, but + The GNU Hurd is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software - Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA. -*/ + Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ -#include <stdio.h> -#include <argp.h> -#include <string.h> #include <stdlib.h> - -#include <unistd.h> -#include <error.h> -#include <sys/stat.h> +#include <string.h> +#include <fcntl.h> +#include <mach.h> #include <hurd/netfs.h> - +#include <hurd/fshelp.h> #include "procfs.h" -/* Defines this Tanslator Name */ -char *netfs_server_name = PROCFS_SERVER_NAME; -char *netfs_server_version = PROCFS_SERVER_VERSION; -int netfs_maxsymlinks = 12; +struct netnode +{ + const struct procfs_node_ops *ops; + void *hook; -static const struct argp_child argp_children[] = - { - {&netfs_std_startup_argp, 0, NULL, 0}, - {0} - }; + /* (cached) contents of the node */ + char *contents; + ssize_t contents_len; + /* parent directory, if applicable */ + struct node *parent; +}; -const char *argp_program_version = "/proc pseudo-filesystem (" PROCFS_SERVER_NAME - ") " PROCFS_SERVER_VERSION "\n" -"Copyright (C) 2008 Free Software Foundation\n" -"This is free software; see the source for copying conditions. There is NO\n" -"warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE." -"\n"; +void +procfs_cleanup_contents_with_free (void *hook, char *cont, ssize_t len) +{ + free (cont); +} -static char *args_doc = "PROCFSROOT"; -static char *doc = "proc pseudo-filesystem for Hurd implemented as a translator. " -"This is still under very humble and initial stages of development.\n" -"Any Contribution or help is welcome. The code may not even compile"; +void +procfs_cleanup_contents_with_vm_deallocate (void *hook, char *cont, ssize_t len) +{ + vm_deallocate (mach_task_self (), (vm_address_t) cont, (vm_size_t) len); +} +struct node *procfs_make_node (const struct procfs_node_ops *ops, void *hook) +{ + struct netnode *nn; + struct node *np; + + nn = malloc (sizeof *nn); + if (! nn) + goto fail; + + memset (nn, 0, sizeof *nn); + nn->ops = ops; + nn->hook = hook; + + np = netfs_make_node (nn); + if (! np) + goto fail; + + np->nn = nn; + memset (&np->nn_stat, 0, sizeof np->nn_stat); + np->nn_translated = 0; + + if (np->nn->ops->lookup) + np->nn_stat.st_mode = S_IFDIR | 0555; + else + np->nn_stat.st_mode = S_IFREG | 0444; + + return np; + +fail: + if (ops->cleanup) + ops->cleanup (hook); + + free (nn); + return NULL; +} -/* The Filesystem */ -struct procfs *procfs; +void procfs_node_chown (struct node *np, uid_t owner) +{ + np->nn_stat.st_uid = owner; +} -/* The FILESYSTEM component of PROCFS_FS. */ -char *procfs_root = ""; +void procfs_node_chmod (struct node *np, mode_t mode) +{ + np->nn_stat.st_mode = (np->nn_stat.st_mode & S_IFMT) | mode; + np->nn_translated = np->nn_stat.st_mode; +} -volatile struct mapped_time_value *procfs_maptime; +void procfs_node_chtype (struct node *np, mode_t type) +{ + np->nn_stat.st_mode = (np->nn_stat.st_mode & ~S_IFMT) | type; + np->nn_translated = np->nn_stat.st_mode; + if (type == S_IFLNK) + procfs_node_chmod (np, 0777); +} + +/* FIXME: possibly not the fastest hash function... */ +ino64_t +procfs_make_ino (struct node *np, const char *filename) +{ + unsigned short x[3]; -/* Startup options. */ -static const struct argp_option procfs_options[] = - { - { 0 } - }; + if (! strcmp (filename, ".")) + return np->nn_stat.st_ino; + if (! strcmp (filename, "..")) + return np->nn->parent ? np->nn->parent->nn_stat.st_ino : /* FIXME: */ 2; - -/* argp parser function for parsing single procfs command line options */ -static error_t -parse_procfs_opt (int key, char *arg, struct argp_state *state) + assert (sizeof np->nn_stat.st_ino > sizeof x); + memcpy (x, &np->nn_stat.st_ino, sizeof x); + + while (*filename) + { + x[0] ^= *(filename++); + jrand48 (x); + } + + return (unsigned long) jrand48 (x); +} + +error_t procfs_get_contents (struct node *np, char **data, ssize_t *data_len) { - switch (key) + if (! np->nn->contents && np->nn->ops->get_contents) { - case ARGP_KEY_ARG: - if (state->arg_num > 1) - argp_usage (state); - break; - - case ARGP_KEY_NO_ARGS: - argp_usage(state); - break; - - default: - return ARGP_ERR_UNKNOWN; + char *contents; + ssize_t contents_len; + error_t err; + + contents_len = -1; + err = np->nn->ops->get_contents (np->nn->hook, &contents, &contents_len); + if (err) + return err; + if (contents_len < 0) + return ENOMEM; + + np->nn->contents = contents; + np->nn->contents_len = contents_len; } + + *data = np->nn->contents; + *data_len = np->nn->contents_len; + return 0; } -/* Program entry point. */ -int -main (int argc, char **argv) +void procfs_refresh (struct node *np) { - error_t err; - mach_port_t bootstrap, underlying_node; - struct stat underlying_stat; - - struct argp argp = + if (np->nn->contents && np->nn->ops->cleanup_contents) + np->nn->ops->cleanup_contents (np->nn->hook, np->nn->contents, np->nn->contents_len); + + np->nn->contents = NULL; +} + +error_t procfs_lookup (struct node *np, const char *name, struct node **npp) +{ + error_t err = ENOENT; + + if (err && ! strcmp (name, ".")) + { + netfs_nref(*npp = np); + err = 0; + } + + if (err && np->nn->parent && ! strcmp (name, "..")) { - procfs_options, parse_procfs_opt, - args_doc, doc, argp_children, - NULL, NULL - }; - - - /* Parse the command line arguments */ -// argp_parse (&argp, argc, argv, 0, 0, 0); - - task_get_bootstrap_port (mach_task_self (), &bootstrap); - - netfs_init (); - - if (maptime_map (0, 0, &procfs_maptime)) + netfs_nref(*npp = np->nn->parent); + err = 0; + } + + if (err && np->nn->ops->lookup) { - perror (PROCFS_SERVER_NAME ": Cannot map time"); - return 1; + err = np->nn->ops->lookup (np->nn->hook, name, npp); + if (! err) + { + (*npp)->nn_stat.st_ino = procfs_make_ino (np, name); + netfs_nref ((*npp)->nn->parent = np); + } } - - procfs_init (); - - err = procfs_create (procfs_root, getpid (), &procfs); - if (err) - error (4, err, "%s", procfs_root); - - /* Create our root node */ - netfs_root_node = procfs->root; - - /* Start netfs activities */ - underlying_node = netfs_startup (bootstrap, 0); - if (io_stat (underlying_node, &underlying_stat)) - error (1, err, "cannot stat underling node"); - - /* Initialize stat information of the root node. */ - netfs_root_node->nn_stat = underlying_stat; - netfs_root_node->nn_stat.st_mode = - S_IFDIR | (underlying_stat.st_mode & ~S_IFMT & ~S_ITRANS); - - for (;;) - netfs_server_loop (); - return 1; + + return err; +} + +void procfs_cleanup (struct node *np) +{ + procfs_refresh (np); + + if (np->nn->ops->cleanup) + np->nn->ops->cleanup (np->nn->hook); + + if (np->nn->parent) + netfs_nrele (np->nn->parent); + + free (np->nn); } @@ -1,220 +1,93 @@ -/* procfs -- a translator for providing GNU/Linux compatible - proc pseudo-filesystem - - procfs.h -- This file is the main header file of this - translator. This has important header - definitions for constants and functions - used in the translator. - - Copyright (C) 2008, FSF. - Written as a Summer of Code Project - - procfs is free software; you can redistribute it and/or +/* Hurd /proc filesystem, basic infrastructure. + Copyright (C) 2010 Free Software Foundation, Inc. + + This file is part of the GNU Hurd. + + The GNU Hurd is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2, or (at your option) any later version. - procfs is distributed in the hope that it will be useful, but + The GNU Hurd is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software - Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA. - - A portion of the code in this file is based on ftpfs code - present in the hurd repositories copyrighted to FSF. The - Copyright notice from that file is given below. - - Copyright (C) 1997,98,2002 Free Software Foundation, Inc. - Written by Miles Bader <miles@gnu.org> - This file is part of the GNU Hurd. -*/ - -#ifndef __PROCFS_H__ -#define __PROCFS_H__ - -#define PROCFS_SERVER_NAME "procfs" -#define PROCFS_SERVER_VERSION "0.0.1" - -/* /proc Filesystem type. */ -#define PROCFILESYSTEM "procfs" - -#define NUMBER_OF_FILES_PER_PID 1 -#define JIFFY_ADJUST 100 -#define PAGES_TO_BYTES(pages) ((pages) * sysconf(_SC_PAGESIZE)) -#define BYTES_TO_PAGES(bytes) ((bytes) / sysconf(_SC_PAGESIZE)) - -#include <stdlib.h> -#include <unistd.h> -#include <cthreads.h> -#include <maptime.h> -#include <hurd/ihash.h> -#include <ps.h> - -typedef unsigned long long jiffy_t; - -/* A single entry in a directory. */ -struct procfs_dir_entry -{ - char *name; /* Name of this entry */ - size_t hv; /* Hash value of NAME */ - - /* The active node referred to by this name (may be 0). - NETFS_NODE_REFCNT_LOCK should be held while frobbing this. */ - struct node *node; - - struct stat stat; - char *symlink_target; - time_t stat_timestamp; - - /* The directory to which this entry belongs. */ - struct procfs_dir *dir; - - /* Link to next entry in hash bucket, and address of previous entry's (or - hash table's) pointer to this entry. If the SELF_P field is 0, then - this is a deleted entry, awaiting final disposal. */ - struct procfs_dir_entry *next, **self_p; - - /* Next entry in 'directory order', or 0 if none known. */ - struct procfs_dir_entry *ordered_next, **ordered_self_p; - - /* When the presence/absence of this file was last checked. */ - time_t name_timestamp; + Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ - hurd_ihash_locp_t inode_locp; /* Used for removing this entry */ +#include <hurd/hurd_types.h> +#include <hurd/netfs.h> - int noent : 1; /* A negative lookup result. */ - int valid : 1; /* Marker for GC'ing. */ -}; - -/* A directory. */ -struct procfs_dir -{ - /* Number of entries in HTABLE. */ - size_t num_entries; - - /* The number of entries that have nodes attached. We keep an additional - reference to our node if there are any, to prevent it from going away. */ - size_t num_live_entries; - - /* Hash table of entries. */ - struct procfs_dir_entry **htable; - size_t htable_len; /* # of elements in HTABLE (not bytes). */ - - /* List of dir entries in 'directory order', in a linked list using the - ORDERED_NEXT and ORDERED_SELF_P fields in each entry. Not all entries - in HTABLE need be in this list. */ - struct procfs_dir_entry *ordered; - - /* The filesystem node that this is the directory for. */ - struct node *node; - - /* The filesystem this directory is in. */ - struct procfs *fs; - - /* The path to this directory in the filesystem. */ - const char *fs_path; + +/* Interface for the procfs side. */ - time_t stat_timestamp; - time_t name_timestamp; - -}; - - -/* libnetfs node structure */ -struct netnode -{ - /* Name of this node */ - char *name; - - /* The path in the filesystem that corresponds - this node. */ - char *fs_path; - - /* The directory entry for this node. */ - struct procfs_dir_entry *dir_entry; - - /* The proc filesystem */ - struct procfs *fs; - - /* inode number, assigned to this netnode structure. */ - unsigned int inode_num; - - /* If this is a directory, the contents, or 0 if not fetched. */ - struct procfs_dir *dir; - - /* pointer to node structure, assigned to this node. */ - struct node *node; - - /* links to the previous and next nodes in the list */ - struct netnode *nextnode, *prevnode; - - /* link to parent netnode of this file or directory */ - struct netnode *parent; - - /* link to the first child netnode of this directory */ - struct netnode *child_first; -}; - -/* The actual procfs filesystem structure */ -struct procfs +/* Any of these callback functions can be omitted, in which case + reasonable defaults will be used. The initial file mode and type + depend on whether a lookup function is provided, but can be + overridden in update_stat(). */ +struct procfs_node_ops { - /* Root of the filesystem. */ - struct node *root; - - /* Inode numbers are assigned sequentially in order of creation. */ - ino_t next_inode; - int fsid; - - /* A hash table mapping inode numbers to directory entries. */ - struct hurd_ihash inode_mappings; - spin_lock_t inode_mappings_lock; + /* Fetch the contents of a node. A pointer to the contents should be + returned in *CONTENTS and their length in *CONTENTS_LEN. The exact + nature of these data depends on whether the node is a regular file, + symlink or directory, as determined by the file mode in + netnode->nn_stat. For regular files and symlinks, they are what + you would expect; for directories, they are an argz vector of the + names of the entries. If upon return, *CONTENTS_LEN is negative or + unchanged, the call is considered to have failed because of a memory + allocation error. */ + error_t (*get_contents) (void *hook, char **contents, ssize_t *contents_len); + void (*cleanup_contents) (void *hook, char *contents, ssize_t contents_len); + + /* Lookup NAME in this directory, and store the result in *np. The + returned node should be created by lookup() using procfs_make_node() + or a derived function. Note that the parent will be kept alive as + long as the child exists, so you can safely reference the parent's + data from the child. You may want to consider locking if there's + any mutation going on, though. */ + error_t (*lookup) (void *hook, const char *name, struct node **np); + + /* Destroy this node. */ + void (*cleanup) (void *hook); }; -extern struct procfs *procfs; - -extern volatile struct mapped_time_value *procfs_maptime; - -extern struct ps_context *ps_context; - -/* Create a new procfs filesystem. */ -error_t procfs_create (char *procfs_root, int fsid, - struct procfs **fs); +/* These helper functions can be used as procfs_node_ops.cleanup_contents. */ +void procfs_cleanup_contents_with_free (void *, char *, ssize_t); +void procfs_cleanup_contents_with_vm_deallocate (void *, char *, ssize_t); -/* Initialize the procfs filesystem for use. */ -error_t procfs_init (); +/* Create a new node and return it. Returns NULL if it fails to allocate + enough memory. In this case, ops->cleanup will be invoked. */ +struct node *procfs_make_node (const struct procfs_node_ops *ops, void *hook); -/* Refresh stat information for NODE */ -error_t procfs_refresh_node (struct node *node); +/* Set the owner of the node NP. Must be called right after the node + has been created. */ +void procfs_node_chown (struct node *np, uid_t owner); -/* Return a new node in NODE, with a name NAME, - and return the new node with a single - reference in NODE. */ -error_t procfs_create_node (struct procfs_dir_entry *dir_entry, - const char *fs_path, - struct node **node); +/* Set the permission bits of the node NP. Must be called right after + the node has been created. */ +void procfs_node_chmod (struct node *np, mode_t mode); -/* Remove NODE from its entry */ -error_t procfs_remove_node (struct node *node); +/* Set the type of the node NP. If type is S_IFLNK, appropriate + permission bits will be set as well. Must be called right after the + node has been created. */ +void procfs_node_chtype (struct node *np, mode_t type); -/* Return in DIR a new procfs directory, in the filesystem FS, - with node NODE and path PATH. */ -error_t procfs_dir_create (struct procfs *fs, struct node *node, - const char *path, struct procfs_dir **dir); + +/* Interface for the libnetfs side. */ -/* Remove the specified DIR and free all its allocated - storage. */ -void procfs_dir_remove (struct procfs_dir *dir); +/* Get the inode number which will be given to a child of NP named FILENAME. + This allows us to retreive them for readdir() without creating the + corresponding child nodes. */ +ino64_t procfs_make_ino (struct node *np, const char *filename); -/* Refresh DIR. */ -error_t procfs_dir_refresh (struct procfs_dir *dir, int isroot); +/* Forget the current cached contents for the node. This is done before reads + from offset 0, to ensure that the data are recent even for utilities such as + top which keep some nodes open. */ +void procfs_refresh (struct node *np); -/* Lookup NAME in DIR, returning its entry, or an error. - *NODE will contain the result node, locked, and with - an additional reference, or 0 if an error occurs. */ -error_t procfs_dir_lookup (struct procfs_dir *dir, const char *name, - struct node **node); +error_t procfs_get_contents (struct node *np, char **data, ssize_t *data_len); +error_t procfs_lookup (struct node *np, const char *name, struct node **npp); +void procfs_cleanup (struct node *np); -#endif /* __PROCFS_H__ */ diff --git a/procfs_dir.c b/procfs_dir.c index bd1e49d..c250aa4 100644 --- a/procfs_dir.c +++ b/procfs_dir.c @@ -1,667 +1,134 @@ -/* procfs -- a translator for providing GNU/Linux compatible - proc pseudo-filesystem +/* Hurd /proc filesystem, infrastructure for directories. + Copyright (C) 2010 Free Software Foundation, Inc. - procfs_dir.c -- This file contains definitions to perform - directory operations such as creating, - removing and refreshing directories. - - Copyright (C) 2008, FSF. - Written as a Summer of Code Project - + This file is part of the GNU Hurd. - procfs is free software; you can redistribute it and/or + The GNU Hurd is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2, or (at your option) any later version. - procfs is distributed in the hope that it will be useful, but + The GNU Hurd is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software - Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA. - - A portion of the code in this file is based on ftpfs code - present in the hurd repositories copyrighted to FSF. The - Copyright notice from that file is given below. - - Copyright (C) 1997,98,2002 Free Software Foundation, Inc. - Written by Miles Bader <miles@gnu.org> - This file is part of the GNU Hurd. -*/ - - -#include <stdio.h> -#include <unistd.h> -#include <hurd/netfs.h> -#include <hurd/ihash.h> -#include <sys/stat.h> + Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ +#include <stdlib.h> +#include <string.h> #include "procfs.h" +#include "procfs_dir.h" -/* Initial HASHTABLE length for the new directories to be created. */ -#define INIT_HTABLE_LEN 5 - -struct procfs_dir_entry **cur_entry; - -/* Return in DIR a new procfs directory, in the filesystem FS, - with node NODE and path PATH. */ -error_t procfs_dir_create (struct procfs *fs, struct node *node, - const char *path, struct procfs_dir **dir) +struct procfs_dir_node { - struct procfs_dir *new = malloc (sizeof (struct procfs_dir)); - if (!new) - return ENOMEM; - struct procfs_dir_entry **htable = calloc (INIT_HTABLE_LEN, - sizeof (struct procfs_dir_entry *)); - if (!htable) - return ENOMEM; - - /* Hold a reference to the new dir's node. */ - spin_lock (&netfs_node_refcnt_lock); - node->references++; - spin_unlock (&netfs_node_refcnt_lock); + const struct procfs_dir_ops *ops; + void *hook; +}; - new->num_entries = 0; - new->num_live_entries = 0; - new->htable_len = INIT_HTABLE_LEN; - new->htable = htable; - new->ordered = NULL; - new->fs_path = path; - new->fs = fs; - new->node = node; - new->stat_timestamp = 0; - new->name_timestamp = 0; - - *dir = new; - - if (fs->root != 0) - node->nn->dir = new; - - return 0; -} - -/* Put the directory entry DIR_ENTRY into the hash table HTABLE. */ -static void -insert (struct procfs_dir_entry *dir_entry, - struct procfs_dir_entry **htable, size_t htable_len) +static int +entry_exists (struct procfs_dir_node *dir, const struct procfs_dir_entry *ent) { - struct procfs_dir_entry **new_htable = &htable[dir_entry->hv % htable_len]; - if (*new_htable) - (*new_htable)->self_p = &dir_entry->next; - dir_entry->next = *new_htable; - dir_entry->self_p = new_htable; - *new_htable = dir_entry; -} + if (ent->ops.exists) + return ent->ops.exists (dir->hook, ent->hook); + if (dir->ops->entry_ops.exists) + return dir->ops->entry_ops.exists (dir->hook, ent->hook); -/* Calculate NAME's hash value. */ -static size_t -hash (const char *name) -{ - size_t hash_value = 0; - while (*name) - hash_value = ((hash_value << 5) + *name++) & 0xFFFFFF; - return hash_value; + return 1; } -/* Extend the existing hashtable for DIR to accomodate values for new length - NEW_LEN. We retain all the previous entries. */ static error_t -rehash (struct procfs_dir *dir, size_t new_len) +procfs_dir_get_contents (void *hook, char **contents, ssize_t *contents_len) { - int count; - size_t old_len = dir->htable_len; - struct procfs_dir_entry **old_htable = dir->htable; - struct procfs_dir_entry **new_htable = (struct procfs_dir_entry **) - malloc (new_len * sizeof (struct procfs_dir_entry *)); + static const char dot_dotdot[] = ".\0.."; + struct procfs_dir_node *dir = hook; + const struct procfs_dir_entry *ent; + int pos; - if (! new_htable) - return ENOMEM; - - bzero (new_htable, new_len * sizeof (struct procfs_dir_entry *)); - - for (count = 0; count < old_len; count++) - while (old_htable[count]) - { - struct procfs_dir_entry *dir_entry = old_htable[count]; - - /* Remove DIR_ENTRY from the old table */ - old_htable[count] = dir_entry->next; - - insert (dir_entry, new_htable, new_len); - } - - free (old_htable); - - dir->htable = new_htable; - dir->htable_len = new_len; - - return 0; -} - -/* Lookup NAME in DIR and return its entry. If there is no such entry, and - DNEW, the decision variable, is true, then a new entry is allocated and - returned, otherwise 0 is returned (if DNEW is true then 0 can be returned - if a memory allocation error occurs). */ -struct procfs_dir_entry * -lookup_entry (struct procfs_dir *dir, const char *name, int dnew) -{ - size_t hv = hash (name); - struct procfs_dir_entry *dir_entry = dir->htable[hv % dir->htable_len]; - - while (dir_entry && strcmp (name, dir_entry->name) != 0) - dir_entry = dir_entry->next; - - if (!dir_entry && dnew) - { - if (dir->num_entries > dir->htable_len) - /* Grow the hash table. */ - if (rehash (dir, (dir->htable_len + 1) * 2 - 1) != 0) - return 0; - - dir_entry = - (struct procfs_dir_entry *) malloc (sizeof (struct procfs_dir_entry)); - - if (dir_entry) - { - dir_entry->hv = hv; - dir_entry->name = strdup (name); - dir_entry->node = 0; - dir_entry->dir = dir; - dir_entry->stat_timestamp = 0; - bzero (&dir_entry->stat, sizeof dir_entry->stat); - dir_entry->symlink_target = 0; - dir_entry->noent = 0; - dir_entry->valid = 0; - dir_entry->name_timestamp = 0; - dir_entry->ordered_next = 0; - dir_entry->ordered_self_p = 0; - dir_entry->next = 0; - dir_entry->self_p = 0; - insert (dir_entry, dir->htable, dir->htable_len); - dir->num_entries++; - } - } + /* Evaluate how much space is needed. Note that we include the hidden + entries, just in case their status changes between now and then. */ + pos = sizeof dot_dotdot; + for (ent = dir->ops->entries; ent->name; ent++) + pos += strlen (ent->name) + 1; - return dir_entry; -} - - -/* Lookup NAME in DIR, returning its entry, or an error. - *NODE will contain the result node, locked, and with - an additional reference, or 0 if an error occurs. */ -error_t procfs_dir_lookup (struct procfs_dir *dir, const char *name, - struct node **node) -{ - struct procfs_dir_entry *dir_entry = 0; - error_t err = 0; - char *fs_path = dir->fs_path; - - struct timeval tv; - maptime_read (procfs_maptime, &tv); - - time_t timestamp = tv.tv_sec; - - if (*name == '\0' || strcmp (name, ".") == 0) - /* Current directory -- just add an additional reference to DIR's node - and return it. */ - { - netfs_nref (dir->node); - *node = dir->node; - return 0; - } - else if (strcmp (name, "..") == 0) - /* Parent directory. */ - { - if (dir->node->nn->dir_entry) - { - *node = dir->node->nn->dir_entry->dir->node; - mutex_lock (&(*node)->lock); - netfs_nref (*node); - } - else - { - err = ENOENT; /* No .. */ - *node = 0; - } - - mutex_unlock (&dir->node->lock); - - return err; - } - - err = procfs_dir_refresh (dir, dir->node == dir->fs->root); - if (!err && !dir_entry) - dir_entry = lookup_entry (dir, name, 0); - - if (! err) - { - if (dir_entry && !dir_entry->noent) - /* We've got a dir entry, get a node for it. */ - { - /* If there's already a node, add a ref so that it doesn't go - away. */ - spin_lock (&netfs_node_refcnt_lock); - if (dir_entry->node) - dir_entry->node->references++; - spin_unlock (&netfs_node_refcnt_lock); - - if (! dir_entry->node) - /* No node; make one and install it into E. */ - { - if (! fs_path) - err = EROFS; - - if (! err) - { - err = procfs_create_node (dir_entry, fs_path, &dir_entry->node); - - if (!err && dir->num_live_entries++ == 0) - /* Keep a reference to dir's node corresponding to - children. */ - { - spin_lock (&netfs_node_refcnt_lock); - dir->node->references++; - spin_unlock (&netfs_node_refcnt_lock); - } - } - } - - if (! err) - { - *node = dir_entry->node; - /* We have to unlock DIR's node before locking the child node - because the locking order is always child-parent. We know - the child node won't go away because we already hold the - additional reference to it. */ - mutex_unlock (&dir->node->lock); - mutex_lock (&dir_entry->node->lock); - } - } - else - err = ENOENT; - } - - if (err) - { - *node = 0; - mutex_unlock (&dir->node->lock); - } - -#if 0 - if (fs_path) - free (fs_path); -#endif - - return err; -} - -/* Lookup the null name in DIR, and return a node for it in NODE. Unlike - procfs_dir_lookup, this won't attempt to validate the existance of the - entry (to avoid opening a new connection if possible) -- that will happen - the first time the entry is refreshed. Also unlink ftpfs_dir_lookup, this - function doesn't expect DIR to be locked, and won't return *NODE locked. - This function is only used for bootstrapping the root node. */ -error_t -procfs_dir_null_lookup (struct procfs_dir *dir, struct node **node) -{ - struct procfs_dir_entry *dir_entry; - error_t err = 0; - - dir_entry = lookup_entry (dir, "", 1); - if (! dir_entry) + *contents = malloc (pos); + if (! *contents) return ENOMEM; - if (! dir_entry->noent) - /* We've got a dir entry, get a node for it. */ - { - /* If there's already a node, add a ref so that it doesn't go away. */ - spin_lock (&netfs_node_refcnt_lock); - if (dir_entry->node) - dir_entry->node->references++; - spin_unlock (&netfs_node_refcnt_lock); - - if (! dir_entry->node) - /* No node; make one and install it into DIR_ENTRY. */ - { - err = procfs_create_node (dir_entry, dir->fs_path, &dir_entry->node); - - if (!err && dir->num_live_entries++ == 0) - /* Keep a reference to dir's node corresponding to children. */ - { - spin_lock (&netfs_node_refcnt_lock); - dir->node->references++; - spin_unlock (&netfs_node_refcnt_lock); - } - } - - if (! err) - *node = dir_entry->node; - } - else - err = ENOENT; - - return err; -} - -/* Free the directory entry DIR_ENTRY and all resources it consumes. */ -void -free_entry (struct procfs_dir_entry *dir_entry) -{ - - assert (! dir_entry->self_p); /* We should only free deleted nodes. */ - free (dir_entry->name); - if (dir_entry->symlink_target) - free (dir_entry->symlink_target); - free (dir_entry->node->nn->dir); - free (dir_entry->node->nn); - free (dir_entry->node); - free (dir_entry); -} - -/* Remove DIR_ENTRY from its position in the ordered_next chain. */ -static void -ordered_unlink (struct procfs_dir_entry *dir_entry) -{ - if (dir_entry->ordered_self_p) - *dir_entry->ordered_self_p = dir_entry->ordered_next; - if (dir_entry->ordered_next) - dir_entry->ordered_next->self_p = dir_entry->ordered_self_p; -} - -/* Delete DIR_ENTRY from its directory, freeing any resources it holds. */ -static void -delete (struct procfs_dir_entry *dir_entry, struct procfs_dir *dir) -{ - dir->num_entries--; - - /* Take out of the hash chain. */ - if (dir_entry->self_p) - *dir_entry->self_p = dir_entry->next; - if (dir_entry->next) - dir_entry->next->self_p = dir_entry->self_p; - - /* Take out of the directory ordered list. */ - ordered_unlink (dir_entry); - - /* If there's a node attached, we'll delete the entry whenever it goes - away, otherwise, just delete it now. */ - if (! dir_entry->node) - free_entry (dir_entry); -} - -/* Make all the directory entries invalid */ -static void -make_dir_invalid (struct procfs_dir *dir) -{ - int count; - size_t len = dir->htable_len; - struct procfs_dir_entry **htable = dir->htable; - struct procfs_dir_entry *dir_entry; - - for (count = 0; count < len; count++) - { - dir_entry = htable[count]; - while (dir_entry) - { - dir_entry->valid = 0; - dir_entry = dir_entry->next; - } - } -} - -/* Delete any entries in DIR which don't have their valid bit set. */ -static void -sweep (struct procfs_dir *dir) -{ - size_t len = dir->htable_len, i; - struct procfs_dir_entry **htable = dir->htable, *dir_entry; - - for (i = 0; i < len; i++) - { - dir_entry = htable[i]; - while (dir_entry) - { - if (!dir_entry->valid && !dir_entry->noent && dir->num_entries) - delete (dir_entry, dir); - dir_entry = dir_entry->next; - } - if (htable[i]) - { - free (htable[i]); - htable[i] = 0; - } - - } - -} - -/* Remove the specified DIR and free all its allocated - storage. */ -void procfs_dir_entries_remove (struct procfs_dir *dir) -{ - /* Free all entries. */ - make_dir_invalid (dir); - sweep (dir); -} - -/* Checks if the DIR name is in list of - Active pids. */ -int is_in_pid_list (struct procfs_dir *dir) -{ - int dir_name; - int count; - pid_t *pids = NULL; - int pidslen = 0; - error_t err; - - if (dir->node->nn) + memcpy (*contents, dot_dotdot, sizeof dot_dotdot); + pos = sizeof dot_dotdot; + for (ent = dir->ops->entries; ent->name; ent++) { - dir_name = atoi (dir->node->nn->dir_entry->name); - err = proc_getallpids (getproc (), &pids, &pidslen); + if (! entry_exists (dir, ent)) + continue; - for (count = 0; count < pidslen; ++count) - if (pids[count] == dir_name) - return 1; + strcpy (*contents + pos, ent->name); + pos += strlen (ent->name) + 1; } + *contents_len = pos; return 0; - } -/* Checks if DIR is a directory that - represents a pid. */ -int check_parent (struct procfs_dir *dir) +static error_t +procfs_dir_lookup (void *hook, const char *name, struct node **np) { - if (dir == dir->fs->root) - return 0; - else - if (is_in_pid_list (dir)) - return 1; - else - return 0; + struct procfs_dir_node *dir = hook; + const struct procfs_dir_entry *ent; -} + for (ent = dir->ops->entries; ent->name && strcmp (name, ent->name); ent++); + if (! ent->name) + return ENOENT; -/* Refresh DIR. */ -error_t procfs_dir_refresh (struct procfs_dir *dir, int isroot) -{ - error_t err; - int is_parent_pid; - struct node *node; - - struct timeval tv; - maptime_read (procfs_maptime, &tv); - - time_t timestamp = tv.tv_sec; - cur_entry = &dir->ordered; - if (isroot) - err = procfs_fill_root_dir(dir, timestamp); + if (ent->ops.make_node) + *np = ent->ops.make_node (dir->hook, ent->hook); + else if (dir->ops->entry_ops.make_node) + *np = dir->ops->entry_ops.make_node (dir->hook, ent->hook); else - { - err = update_dir_entries (dir, timestamp); - is_parent_pid = check_parent (dir); - if (is_parent_pid) - err = procfs_create_files (dir, &node, timestamp); - } + return EGRATUITOUS; - return err; -} - -/* Update the directory entry for NAME to reflect STAT and SYMLINK_TARGET. - This also creates a valid linked list of entries imposing ordering on - them. */ -struct procfs_dir_entry* -update_entries_list (struct procfs_dir *dir, const char *name, - const struct stat *stat, time_t timestamp, - const char *symlink_target) -{ - ino_t ino; - struct procfs_dir_entry *dir_entry = lookup_entry (dir, name, 1); - struct procfs *fs = dir->fs; - - if (! dir_entry) + if (! *np) return ENOMEM; - if (dir_entry->stat.st_ino) - ino = dir_entry->stat.st_ino; - else - ino = fs->next_inode++; - - dir_entry->name_timestamp = timestamp; - - if (stat) - /* The ST and SYMLINK_TARGET parameters are only valid if ST isn't 0. */ - { - dir_entry->stat = *stat; - dir_entry->stat_timestamp = timestamp; - - if (!dir_entry->symlink_target || !symlink_target - || strcmp (dir_entry->symlink_target, symlink_target) != 0) - { - if (dir_entry->symlink_target) - free (dir_entry->symlink_target); - dir_entry->symlink_target = symlink_target ? strdup (symlink_target) : 0; - } - } - - /* The st_ino field is always valid. */ - dir_entry->stat.st_ino = ino; - dir_entry->stat.st_fsid = fs->fsid; - dir_entry->stat.st_fstype = PROCFILESYSTEM; - - dir_entry->valid = 1; - - if (! dir_entry->ordered_self_p) - /* Position DIR_ENTRY in the ordered chain following the previously seen entry. */ - { - /* The PREV_ENTRY_NEXT_P field holds a pointer to the NEXT-field of the - previous entry, or a pointer to the ORDERED field in the directory. */ - dir_entry->ordered_self_p = cur_entry; - - if (*dir_entry->ordered_self_p) - /* Update the self_p pointer of the previous successor. */ - (*dir_entry->ordered_self_p)->ordered_self_p = &dir_entry->ordered_next; - - /* DIR_ENTRY comes before the previous successor. */ - dir_entry->ordered_next = *dir_entry->ordered_self_p; + return 0; +} - *dir_entry->ordered_self_p = dir_entry; /* Put DIR_ENTRY there. */ - } +static void +procfs_dir_cleanup (void *hook) +{ + struct procfs_dir_node *dir = hook; - /* Put the next entry after this one. */ - cur_entry = &dir_entry->ordered_next; + if (dir->ops->cleanup) + dir->ops->cleanup (dir->hook); - return dir_entry; + free (dir); } -/* Fills DIR, the root directory with all the pids of - processes running in the system as directories. */ -error_t -procfs_fill_root_dir(struct procfs_dir *dir, time_t timestamp) +struct node * +procfs_dir_make_node (const struct procfs_dir_ops *dir_ops, void *dir_hook) { - error_t err; - char *data; - pid_t *pids; - int pidslen; - struct stat stat; - stat.st_mode = S_IFDIR | S_IRUSR | S_IXUSR | S_IRGRP | S_IXGRP | - S_IROTH | S_IXOTH; - stat.st_nlink = 1; - stat.st_size = 0; + static const struct procfs_node_ops ops = { + .get_contents = procfs_dir_get_contents, + .lookup = procfs_dir_lookup, + .cleanup_contents = procfs_cleanup_contents_with_free, + .cleanup = procfs_dir_cleanup, + }; + struct procfs_dir_node *dir; - int count; - char *dir_name_pid; - struct node *node; - struct procfs_dir *new_dir; - struct procfs_dir_entry *dir_entry; - struct proc_stat *ps; - - pids = NULL; - pidslen = 0; - err = proc_getallpids (getproc (), &pids, &pidslen); - - if (!err) + dir = malloc (sizeof *dir); + if (! dir) { - for (count = 0; count < pidslen; count++) - { - if (asprintf (&dir_name_pid, "%d", pids[count]) == -1) - return errno; - -#if 0 - node = (struct node *) malloc (sizeof (struct node)); - new_dir = (struct procfs_dir *) malloc (sizeof (struct procfs_dir )); - - if (! node || ! new_dir ) - return ENOMEM; -#endif - err = _proc_stat_create (pids[count], ps_context, &ps); - if (! err) - { - err = set_field_value (ps, PSTAT_PROC_INFO); - if (! err) - { - stat.st_uid = proc_stat_proc_info (ps)->owner; - stat.st_gid = proc_stat_proc_info (ps)->pgrp; - - dir_entry = update_entries_list (dir, dir_name_pid, - &stat, timestamp, NULL); - err = procfs_create_node (dir_entry, dir_name_pid, &node); + if (dir_ops->cleanup) + dir_ops->cleanup (dir_hook); - procfs_dir_create (dir->fs, node, - dir_name_pid, &new_dir); - free(dir_name_pid); - _proc_stat_free (ps); - } - } - } + return NULL; } - if ((err = procfs_create_uptime (dir, &node, timestamp)) != 0) - return err; + dir->ops = dir_ops; + dir->hook = dir_hook; - if ((err = procfs_create_stat (dir, &node, timestamp)) != 0) - return err; - - if ((err = procfs_create_version (dir, &node, timestamp)) != 0) - return err; - - if ((err = procfs_create_meminfo (dir, &node, timestamp)) != 0) - return err; - - if ((err = procfs_create_loadavg (dir, &node, timestamp)) != 0) - return err; - - if ((err = procfs_create_mounts (dir, &node, timestamp)) != 0) - return err; - - return 0; + return procfs_make_node (&ops, dir); } -error_t update_dir_entries (struct procfs_dir *dir) -{ - /* STUB */ - return 0; -} diff --git a/procfs_dir.h b/procfs_dir.h new file mode 100644 index 0000000..94c5b01 --- /dev/null +++ b/procfs_dir.h @@ -0,0 +1,63 @@ +/* Hurd /proc filesystem, infrastructure for directories. + Copyright (C) 2010 Free Software Foundation, Inc. + + This file is part of the GNU Hurd. + + The GNU Hurd is free software; you can redistribute it and/or + modify it under the terms of the GNU General Public License as + published by the Free Software Foundation; either version 2, or (at + your option) any later version. + + The GNU Hurd is distributed in the hope that it will be useful, but + WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ + +/* This module provides an abstraction layer for implementing simple + directories with (mostly) static contents. The user defines the + contents of the directory by providing a table of entries and various + optional callback functions. */ + +/* These operations define how a given entry will behave. Either can be + omitted, both from the entry-specific operations and from the + directory-wide defaults. */ +struct procfs_dir_entry_ops +{ + /* Called when this entry is looked up to create a corresponding node. */ + struct node *(*make_node)(void *dir_hook, const void *entry_hook); + /* If this is provided and returns 0, this entry will be hidden. */ + int (*exists)(void *dir_hook, const void *entry_hook); +}; + +/* Describes an individual directory entry, associating a NAME with + * arbitrary HOOK data and node-specific OPS. */ +struct procfs_dir_entry +{ + const char *name; + const void *hook; + struct procfs_dir_entry_ops ops; +}; + +/* Describes a complete directory. ENTRIES is a table terminated by a + null NAME field. ENTRY_OPS provides default operations for the + entries which don't specify them. The optional CLEANUP function + should release all the resources associated with the directory hook. */ +struct procfs_dir_ops +{ + const struct procfs_dir_entry *entries; + void (*cleanup)(void *dir_hook); + struct procfs_dir_entry_ops entry_ops; +}; + +/* Create and return a new node for the directory described in OPS. + The DIR_HOOK is passed the MAKE_NODE callback function of looked up + entries, as well as to the CLEANUP callback when the node is + destroyed. If not enough memory can be allocated, OPS->CLEANUP is + invoked immediately and NULL is returned. */ +struct node * +procfs_dir_make_node (const struct procfs_dir_ops *ops, void *dir_hook); + diff --git a/procfs_nonpid_files.c b/procfs_nonpid_files.c deleted file mode 100644 index f130066..0000000 --- a/procfs_nonpid_files.c +++ /dev/null @@ -1,527 +0,0 @@ -/* procfs -- a translator for providing GNU/Linux compatible - proc pseudo-filesystem - - procfs_nonpid_files.c -- This file contains function definitions - to create and update the non-Per PID - files and their contents. - - Copyright (C) 2008, FSF. - Written as a Summer of Code Project - - - procfs is free software; you can redistribute it and/or - modify it under the terms of the GNU General Public License as - published by the Free Software Foundation; either version 2, or (at - your option) any later version. - - procfs is distributed in the hope that it will be useful, but - WITHOUT ANY WARRANTY; without even the implied warranty of - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - General Public License for more details. - - You should have received a copy of the GNU General Public License - along with this program; if not, write to the Free Software - Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA. - - A portion of the code in this file is based on vmstat.c code - present in the hurd repositories copyrighted to FSF. The - Copyright notice from that file is given below. - - Copyright (C) 1997,98,2002 Free Software Foundation, Inc. - Written by Miles Bader <miles@gnu.org> - This file is part of the GNU Hurd. -*/ - -#include <stdio.h> -#include <unistd.h> -#include <hurd/netfs.h> -#include <hurd/ihash.h> -#include <fcntl.h> -#include <sys/stat.h> -#include <sys/sysinfo.h> -#include <mach/vm_statistics.h> -#include <mach/default_pager.h> -#include <hurd.h> -#include <hurd/paths.h> -#include <mach.h> -#include <ps.h> -#include <time.h> - -#include "procfs.h" - -typedef long long val_t; -#define BADVAL ((val_t) - 1LL) - -/* default pager port (must be privileged to fetch this). */ -mach_port_t def_pager; -struct default_pager_info def_pager_info; - -error_t procfs_create_uptime (struct procfs_dir *dir, - struct node **node, - time_t timestamp) -{ - int err; - char *file_name, *file_path; - struct procfs_dir_entry *dir_entry; - - if (asprintf (&file_name, "%s", "uptime") == -1) - return errno; - if (asprintf (&file_path, "%s", "uptime") == -1) - return errno; - - dir_entry = update_pid_entries (dir, file_name, timestamp, NULL); - err = procfs_create_node (dir_entry, file_path, node); - - free (file_name); - free (file_path); - - return err; -} - -error_t procfs_create_version(struct procfs_dir *dir, - struct node **node, - time_t timestamp) -{ - int err; - char *file_name, *file_path; - struct procfs_dir_entry *dir_entry; - - if (asprintf (&file_name, "%s", "version") == -1) - return errno; - if (asprintf (&file_path, "%s", "version") == -1) - return errno; - - dir_entry = update_pid_entries (dir, file_name, timestamp, NULL); - err = procfs_create_node (dir_entry, file_path, node); - - free (file_name); - free (file_path); - - return 0; -} - -error_t procfs_create_stat (struct procfs_dir *dir, - struct node **node, - time_t timestamp) -{ - int err; - char *file_name, *file_path; - struct procfs_dir_entry *dir_entry; - - if (asprintf (&file_name, "%s", "stat") == -1) - return errno; - if (asprintf (&file_path, "%s", "stat") == -1) - return errno; - - dir_entry = update_pid_entries (dir, file_name, timestamp, NULL); - err = procfs_create_node (dir_entry, file_path, node); - - free (file_name); - free (file_path); - - return err; -} - -error_t procfs_create_meminfo (struct procfs_dir *dir, - struct node **node, - time_t timestamp) -{ - int err; - char *file_name, *file_path; - struct procfs_dir_entry *dir_entry; - - if (asprintf (&file_name, "%s", "meminfo") == -1) - return errno; - if (asprintf (&file_path, "%s", "meminfo") == -1) - return errno; - - dir_entry = update_pid_entries (dir, file_name, timestamp, NULL); - err = procfs_create_node (dir_entry, file_path, node); - - free (file_name); - free (file_path); - - return err; -} - -error_t procfs_create_loadavg (struct procfs_dir *dir, - struct node **node, - time_t timestamp) -{ - int err; - char *file_name, *file_path; - struct procfs_dir_entry *dir_entry; - - if (asprintf (&file_name, "%s", "loadavg") == -1) - return errno; - if (asprintf (&file_path, "%s", "loadavg") == -1) - return errno; - - dir_entry = update_pid_entries (dir, file_name, timestamp, NULL); - err = procfs_create_node (dir_entry, file_path, node); - - free (file_name); - free (file_path); - - return err; -} - -error_t procfs_create_mounts (struct procfs_dir *dir, - struct node **node, - time_t timestamp) -{ - struct procfs_dir_entry *dir_entry; - int err; - - dir_entry = update_pid_entries (dir, "mounts", timestamp, "/etc/mtab"); - err = procfs_create_node (dir_entry, "mounts", node); - - return err; -} - -error_t get_uptime (struct timeval *uptime) -{ - struct timeval boot_time, now; - error_t err; - struct proc_stat *ps; - - err = _proc_stat_create (1, ps_context, &ps); - - if (err) - return err; - - err = proc_stat_set_flags (ps, PSTAT_TASK_BASIC); - if (!err && !(ps->flags & PSTAT_TASK_BASIC)) - err = EGRATUITOUS; - - if (! err) - { - time_value_t *const tv = &proc_stat_task_basic_info (ps)->creation_time; - boot_time.tv_sec = tv->seconds; - boot_time.tv_usec = tv->microseconds; - if (gettimeofday (&now, 0) < 0) - error (0, errno, "gettimeofday"); - timersub (&now, &boot_time, uptime); - } - - _proc_stat_free (ps); - return err; -} - -error_t get_total_times (struct timeval *total_user_time, - struct timeval *total_system_time) -{ - error_t err; - pid_t *pids; - int pidslen = 0, count; - struct proc_stat *ps; - struct task_thread_times_info live_threads_times; - - struct timeval total_user_time_tmp; - struct timeval total_system_time_tmp; - struct timeval tmpval; - - timerclear (&total_user_time_tmp); - timerclear (&total_system_time_tmp); - - pids = NULL; - err = proc_getallpids (getproc (), &pids, &pidslen); - - if (!err) - for (count = 0; count < pidslen; count++) - { - err = _proc_stat_create (pids[count], ps_context, &ps); - if (err) - return err; - - err = proc_stat_set_flags (ps, PSTAT_TASK_BASIC); - if (!err && !(ps->flags & PSTAT_TASK_BASIC)) - err = EGRATUITOUS; - - if (! err) - { - tmpval.tv_sec = proc_stat_task_basic_info (ps)->user_time.seconds; - tmpval.tv_usec = proc_stat_task_basic_info (ps)->user_time.seconds; - timeradd (&total_user_time_tmp, &tmpval, &total_user_time_tmp); - - tmpval.tv_sec = proc_stat_task_basic_info (ps)->system_time.seconds; - tmpval.tv_usec = proc_stat_task_basic_info (ps)->system_time.seconds; - timeradd (&total_system_time_tmp, &tmpval, &total_system_time_tmp); - - error_t err = set_field_value (ps, PSTAT_TASK); - if (! err) - { - err = get_task_thread_times (ps->task, &live_threads_times); - if (! err) - { - tmpval.tv_sec = live_threads_times.user_time.seconds; - tmpval.tv_usec = live_threads_times.user_time.microseconds; - timeradd (&total_user_time_tmp, &tmpval, &total_user_time_tmp); - - tmpval.tv_sec = live_threads_times.system_time.seconds; - tmpval.tv_usec = live_threads_times.system_time.microseconds; - timeradd (&total_system_time_tmp, &tmpval, &total_system_time_tmp); - } - } - } - _proc_stat_free (ps); - } - - total_user_time->tv_sec = total_user_time_tmp.tv_sec; - total_user_time->tv_usec = total_user_time_tmp.tv_usec; - - total_system_time->tv_sec = total_system_time_tmp.tv_sec; - total_system_time->tv_usec = total_system_time_tmp.tv_usec; - - return err; -} - -error_t procfs_read_nonpid_stat (struct dir_entry *dir_entry, - off_t offset, size_t *len, void *data) -{ - char *stat_data; - error_t err; - jiffy_t total_user_time_jiffy, total_system_time_jiffy; - jiffy_t idle_time_jiffy; - struct timeval uptime, total_user_time, total_system_time; - struct timeval idle_time; - - err = get_uptime (&uptime); - - if (! err) - { - err = get_total_times (&total_user_time, &total_system_time); - - if (! err) - { - timersub (&uptime, &total_system_time, - &idle_time); - - total_user_time_jiffy = 100 * ((double) total_user_time.tv_sec + - (double) total_user_time.tv_usec / (1000 * 1000)); - total_system_time_jiffy = 100 * ((double) total_system_time.tv_sec + - (double) total_system_time.tv_usec / (1000 * 1000)); - idle_time_jiffy = 100 * ((double) idle_time.tv_sec + - (double) idle_time.tv_usec / (1000 * 1000)); - - if (asprintf (&stat_data, "cpu %llu %llu %llu %llu %llu %llu %d %d %d\n" - "cpu0 %llu %llu %llu %llu %llu %llu %d %d %d\n" - "intr %llu %llu %llu %llu %llu %llu %d %d %d\n", - total_user_time_jiffy, (long long unsigned) 0, - total_system_time_jiffy, idle_time_jiffy, - (long long unsigned) 0, (long long unsigned) 0, - 0, 0, 0, - total_user_time_jiffy, (long long unsigned) 0, - total_system_time_jiffy, idle_time_jiffy, - (long long unsigned) 0, (long long unsigned) 0, - 0, 0, 0, - (long long unsigned) 0, - (long long unsigned) 0, (long long unsigned) 0, (long long unsigned) 0, - (long long unsigned) 0, - (long long unsigned) 0, (long long unsigned) 0, - (long long unsigned) 0, (long long unsigned) 0) == -1) - return errno; - } - } - - memcpy (data, stat_data, strlen(stat_data)); - *len = strlen (data); - - free (stat_data); - return err; -} - -/* Makes sure the default pager port and associated - info exists, and returns 0 if not (after printing - an error). */ -static int -ensure_def_pager_info () -{ - error_t err; - - if (def_pager == MACH_PORT_NULL) - { - mach_port_t host; - - err = get_privileged_ports (&host, 0); - if (err == EPERM) - { - /* We are not root, so try opening the /servers file. */ - def_pager = file_name_lookup (_SERVERS_DEFPAGER, O_READ, 0); - if (def_pager == MACH_PORT_NULL) - { - error (0, errno, _SERVERS_DEFPAGER); - return 0; - } - } - if (def_pager == MACH_PORT_NULL) - { - if (err) - { - error (0, err, "get_privileged_ports"); - return 0; - } - - err = vm_set_default_memory_manager (host, &def_pager); - mach_port_deallocate (mach_task_self (), host); - - if (err) - { - error (0, err, "vm_set_default_memory_manager"); - return 0; - } - } - } - - if (!MACH_PORT_VALID (def_pager)) - { - if (def_pager == MACH_PORT_NULL) - { - error (0, 0, - "No default pager running, so no swap information available"); - def_pager = MACH_PORT_DEAD; /* so we don't try again */ - } - return 0; - } - - err = default_pager_info (def_pager, &def_pager_info); - if (err) - error (0, err, "default_pager_info"); - return (err == 0); -} - -#define SWAP_FIELD(getter, expr) \ - static val_t getter () \ - { return ensure_def_pager_info () ? (val_t) (expr) : BADVAL; } - -SWAP_FIELD (get_swap_size, def_pager_info.dpi_total_space) -SWAP_FIELD (get_swap_free, def_pager_info.dpi_free_space) -SWAP_FIELD (get_swap_page_size, def_pager_info.dpi_page_size) -SWAP_FIELD (get_swap_active, (def_pager_info.dpi_total_space - - def_pager_info.dpi_free_space)) - -error_t procfs_read_nonpid_meminfo (struct dir_entry *dir_entry, - off_t offset, size_t *len, void *data) -{ - char *meminfo_data; - error_t err; - struct vm_statistics vmstats; - - err = vm_statistics (mach_task_self (), &vmstats); - - unsigned long mem_size = ((vmstats.free_count + - vmstats.active_count + vmstats.inactive_count + - vmstats.wire_count) * vmstats.pagesize) / 1024; - - if (! err) - if (asprintf (&meminfo_data, "MemTotal:\t%lu kB\n" - "MemFree:\t%lu kB\n" - "Buffers:\t%ld kB\n" - "Cached:\t\t%ld kB\n" - "SwapCached:\t%ld kB\n" - "Active:\t\t%lu kB\n" - "Inactive:\t%lu kB\n" - "HighTotal:\t%lu kB\n" - "HighFree:\t%lu kB\n" - "LowTotal:\t%lu kB\n" - "LowFree:\t%lu kB\n" - "SwapTotal:\t%llu kB\n" - "SwapFree:\t%llu kB\n", - mem_size, (PAGES_TO_BYTES(vmstats.free_count)) / 1024 , 0, 0, 0, - (PAGES_TO_BYTES(vmstats.active_count)) / 1024, - (PAGES_TO_BYTES(vmstats.inactive_count)) / 1024, 0, 0, 0, 0, - get_swap_size () / 1024, get_swap_free () / 1024) == -1) - return errno; - - memcpy (data, meminfo_data, strlen(meminfo_data)); - *len = strlen (data); - - free (meminfo_data); - return err; -} - -error_t procfs_read_nonpid_loadavg (struct dir_entry *dir_entry, - off_t offset, size_t *len, void *data) -{ - char *loadavg_data; - error_t err; - processor_set_info_t info; - natural_t *count; - struct host_load_info *load; - mach_port_t host; - - err = ps_host_load_info (&load); - if (err) - error (0, err, "ps_host_load_info"); - - if (! err) - if (asprintf (&loadavg_data, "%.2f %.2f %.2f %d/%d %d\n", - (double)load->avenrun[0] / (double)LOAD_SCALE, - (double)load->avenrun[1] / (double)LOAD_SCALE, - (double)load->avenrun[2] / (double)LOAD_SCALE, 0, 0, 0) == -1) - return errno; - - memcpy (data, loadavg_data, strlen(loadavg_data)); - *len = strlen (data); - - free (loadavg_data); - return err; -} - -error_t procfs_read_nonpid_uptime (struct dir_entry *dir_entry, - off_t offset, size_t *len, void *data) -{ - char *uptime_data; - error_t err; - double uptime_secs, idle_time_secs; - - struct timeval uptime_val; - struct timeval uptime, total_user_time, total_system_time; - struct timeval idle_time; - - - err = get_uptime (&uptime); - if (! err) - { - err = get_total_times (&total_user_time, - &total_system_time); - if (! err) - { - timersub (&uptime, &total_system_time, - &idle_time); - - uptime_secs = (double) uptime.tv_sec + - (double) uptime.tv_usec / (1000 * 1000); - - idle_time_secs = (double) idle_time.tv_sec + - (double) idle_time.tv_usec / (1000 * 1000); - - if (asprintf (&uptime_data, "%.2f %.2f\n", - uptime_secs, idle_time_secs) == -1) - return errno; - } - } - - - memcpy (data, uptime_data, strlen(uptime_data)); - *len = strlen (data); - - free (uptime_data); - return err; -} - -error_t procfs_read_nonpid_version (struct dir_entry *dir_entry, - off_t offset, size_t *len, void *data) -{ - char *version_data; - error_t err = 0; - - if (asprintf (&version_data, "Linux version 2.6.18\n", NULL) == -1) - return errno; - - memcpy (data, version_data, strlen(version_data)); - *len = strlen (data); - - free (version_data); - return err; -} diff --git a/procfs_pid.h b/procfs_pid.h deleted file mode 100644 index 566c83e..0000000 --- a/procfs_pid.h +++ /dev/null @@ -1,88 +0,0 @@ -/* procfs -- a translator for providing GNU/Linux compatible - proc pseudo-filesystem - - procfs_pid.h -- This is the header file of which contains defintions - for structure of directory with PID as the name and - structure of each file in this directory. - - Copyright (C) 2008, FSF. - Written as a Summer of Code Project - - procfs is free software; you can redistribute it and/or - modify it under the terms of the GNU General Public License as - published by the Free Software Foundation; either version 2, or (at - your option) any later version. - - procfs is distributed in the hope that it will be useful, but - WITHOUT ANY WARRANTY; without even the implied warranty of - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - General Public License for more details. - - You should have received a copy of the GNU General Public License - along with this program; if not, write to the Free Software - Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA. -*/ - -#ifndef __PROCFS_PID_H__ -#define __PROCFS_PID_H__ - -#include "procfs.h" - -struct procfs_pid_files -{ - struct procfs_cwd *procfs_cwd; - struct procfs_environ *procfs_environ; - struct procfs_cpu *procfs_cpu; - struct procfs_root *procfs_root; - struct procfs_exe *procfs_exe; - struct procfs_stat *_procfs_stat; - struct procfs_statm *procfs_statm; -}; - -struct procfs_stat -{ - pid_t pid; - char *comm; - char *state; - pid_t ppid; - pid_t pgid; - pid_t sid; - int tty_nr; - pid_t tty_pgrp; - unsigned flags; - long unsigned minflt; - long unsigned cminflt; - long unsigned majflt; - long unsigned cmajflt; - jiffy_t utime; - jiffy_t stime; - jiffy_t cutime; - jiffy_t cstime; - long priority; - long nice; - long num_threads; - long itrealvalue; - long long unsigned starttime; - long unsigned vsize; - long rss; - long unsigned rlim; - long unsigned startcode; - long unsigned endcode; - long unsigned startstack; - long unsigned kstkesp; - long unsigned kstkeip; - long unsigned signal; - long unsigned blocked; - long unsigned sigignore; - long unsigned sigcatch; - long unsigned wchan; - long unsigned nswap; - long unsigned cnswap; - int exit_signal; - int processor; - unsigned rt_priority; - unsigned policy; - long long unsigned delayacct_blkio_ticks; -}; - -#endif diff --git a/procfs_pid_files.c b/procfs_pid_files.c deleted file mode 100644 index 26a0af3..0000000 --- a/procfs_pid_files.c +++ /dev/null @@ -1,583 +0,0 @@ -/* procfs -- a translator for providing GNU/Linux compatible - proc pseudo-filesystem - - procfs_pid_files.c -- This file contains definitions to perform - file operations such as creating, writing to, - reading from and removing files that holds - information for each process with PID - - Copyright (C) 2008, FSF. - Written as a Summer of Code Project - - - procfs is free software; you can redistribute it and/or - modify it under the terms of the GNU General Public License as - published by the Free Software Foundation; either version 2, or (at - your option) any later version. - - procfs is distributed in the hope that it will be useful, but - WITHOUT ANY WARRANTY; without even the implied warranty of - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - General Public License for more details. - - You should have received a copy of the GNU General Public License - along with this program; if not, write to the Free Software - Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA. - - A portion of the code in this file is based on ftpfs code - present in the hurd repositories copyrighted to FSF. The - Copyright notice from that file is given below. - -*/ - -#include <hurd/netfs.h> -#include <fcntl.h> -#include <string.h> -#include <stdio.h> -#include <mach/task_info.h> -#include <sys/resource.h> - -#include "procfs_pid.h" - -/* Update the files named NAME within the directory named - PID also with SYMLINK TARGET if necessary. */ -struct procfs_dir_entry* -update_pid_entries (struct procfs_dir *dir, const char *name, - time_t timestamp, - const char *symlink_target) -{ - struct stat stat; - - memset (&stat, 0, sizeof stat); - if (symlink_target) - { - stat.st_size = strlen (symlink_target); - stat.st_mode = S_IFLNK | 0777; - } - else - { - stat.st_size = 0; - stat.st_mode = S_IFREG | 0444; - } - - return update_entries_list (dir, name, &stat, timestamp, symlink_target); -} - -/* Creates files to store process information for DIR - whose names are pids and returns these files in *NODE. */ -error_t -procfs_create_files (struct procfs_dir *dir, - struct node **node, - time_t timestamp) -{ - int err; - char *file_name, *file_path; - struct procfs_dir_entry *dir_entry; - - if (asprintf (&file_name, "%s", "stat") == -1) - return errno; - if (asprintf (&file_path, "%s/%s", dir->node->nn->dir_entry->name, "stat") == -1) - return errno; - - dir_entry = update_pid_entries (dir, file_name, timestamp, NULL); - err = procfs_create_node (dir_entry, file_path, node); - - free (file_name); - free (file_path); - - if (asprintf (&file_name, "%s", "status") == -1) - return errno; - if (asprintf (&file_path, "%s/%s", dir->node->nn->dir_entry->name, "status") == -1) - return errno; - - dir_entry = update_pid_entries (dir, file_name, timestamp, NULL); - err = procfs_create_node (dir_entry, file_path, node); - - free (file_name); - free (file_path); - - if (asprintf (&file_name, "%s", "cmdline") == -1) - return errno; - if (asprintf (&file_path, "%s/%s", dir->node->nn->dir_entry->name, "cmdline") == -1) - return errno; - - dir_entry = update_pid_entries (dir, file_name, timestamp, NULL); - err = procfs_create_node (dir_entry, file_path, node); - - free (file_name); - free (file_path); - - if (asprintf (&file_name, "%s", "statm") == -1) - return errno; - if (asprintf (&file_path, "%s/%s", dir->node->nn->dir_entry->name, "statm") == -1) - return errno; - - dir_entry = update_pid_entries (dir, file_name, timestamp, NULL); - err = procfs_create_node (dir_entry, file_path, node); - - free (file_name); - free (file_path); - -#if 0 - nodes_list = &node_stat; - nodes_list++; - node = nodes_list; -#endif - - return err; -} - -/* Check if the PSTAT_FLAG is set in the corresponding PS - structure, if not set it and check again and return error - status accordingly. */ -error_t set_field_value (struct proc_stat *ps, int pstat_flag) -{ - error_t err; - - if (! (ps->flags & pstat_flag)) - { - err = proc_stat_set_flags (ps, pstat_flag); - if (err) - return err; - - /* This second check is done since ps.h specifies to - do so since the previous call would not have set - the required value. */ - if (! (ps->flags & pstat_flag)) - return EGRATUITOUS; - } - - return 0; -} - -/* Adjusts TIME_VAL structure having Seconds and - Microseconds into the value in jiffies. The - value of jiffy is a hack to adjust to what - procps uses. */ -jiffy_t adjust_jiffy_time (time_value_t time_val) -{ - jiffy_t jiffy_time = time_val.seconds * JIFFY_ADJUST; - jiffy_time += (time_val.microseconds * JIFFY_ADJUST) - / (1000 * 1000); - - return jiffy_time; -} - -/* Extract the user and system time for the live threads of - the process. This information is directly retrieved from - MACH since neither libps not proc makes this available. */ -error_t get_task_thread_times (task_t task, - struct task_thread_times_info *live_threads_times) -{ - error_t err; - size_t tkcount = TASK_THREAD_TIMES_INFO_COUNT; - - err = task_info (task, TASK_THREAD_TIMES_INFO, - (task_info_t) live_threads_times, &tkcount); - if (err == MACH_SEND_INVALID_DEST) - err = ESRCH; - - return err; -} - -/* Obtains the User Time in UTIME and System Time in STIME from - MACH directly since this is neither made available by libps - nor by proc server. */ -error_t get_live_threads_time (struct proc_stat *ps, - jiffy_t *utime, jiffy_t *stime) -{ - struct task_thread_times_info live_threads_times; - error_t err = set_field_value (ps, PSTAT_TASK); - - if (! err) - { - err = get_task_thread_times (ps->task, &live_threads_times); - if (! err) - { - *utime = adjust_jiffy_time ( - live_threads_times.user_time); - *stime = adjust_jiffy_time ( - live_threads_times.system_time); - } - } - - return err; -} - -/* Get the data for stat file into the structure - PROCFS_STAT. */ -error_t get_stat_data (pid_t pid, - struct procfs_stat **procfs_stat) -{ - error_t err; - struct procfs_stat *new = (struct procfs_stat *) - malloc (sizeof (struct procfs_stat)); - - struct proc_stat *ps; - jiffy_t utime, stime; - - err = _proc_stat_create (pid, ps_context, &ps); - - new->pid = pid; - - if (! err) - { - err = set_field_value (ps, PSTAT_ARGS); - if (! err) - asprintf (&new->comm, "%s", ps->args); - } - - err = set_field_value (ps, PSTAT_STATE); - if (! err) - { - if (ps->state & PSTAT_STATE_P_STOP) - new->state = strdup ("T"); - if (ps->state & PSTAT_STATE_P_ZOMBIE) - new->state = strdup ("Z"); - if (ps->state & PSTAT_STATE_P_FG) - new->state = strdup ("+"); - if (ps->state & PSTAT_STATE_P_SESSLDR) - new->state = strdup ("s"); - if (ps->state & PSTAT_STATE_P_LOGINLDR) - new->state = strdup ("l"); - if (ps->state & PSTAT_STATE_P_FORKED) - new->state = strdup ("f"); - if (ps->state & PSTAT_STATE_P_NOMSG) - new->state = strdup ("m"); - if (ps->state & PSTAT_STATE_P_NOPARENT) - new->state = strdup ("p"); - if (ps->state & PSTAT_STATE_P_ORPHAN) - new->state = strdup ("o"); - if (ps->state & PSTAT_STATE_P_TRACE) - new->state = strdup ("x"); - if (ps->state & PSTAT_STATE_P_WAIT) - new->state = strdup ("w"); - if (ps->state & PSTAT_STATE_P_GETMSG) - new->state = strdup ("g"); - } - - err = set_field_value (ps, PSTAT_PROC_INFO); - if (! err) - { - new->ppid = ps->proc_info->ppid; - new->pgid = ps->proc_info->pgrp; - new->sid = ps->proc_info->session; - new->tty_pgrp = ps->proc_info->pgrp; - } - else - { - new->ppid = 0; - new->pgid = 0; - new->sid = 0; - new->tty_pgrp = 0; - } - - err = set_field_value (ps, PSTAT_STATE); - if (! err) - new->flags = ps->state; - else - new->flags = 0; - - err = set_field_value (ps, PSTAT_TASK_EVENTS); - if (! err) - { - new->minflt = ps->task_events_info->faults; - new->majflt = ps->task_events_info->pageins; - } - else - { - new->minflt = 0; - new->majflt = 0; - } - - /* This seems to be a bit inconsistent with setting of other - fields in this code. There are two reasons for this. - 1. The actual information required is not made available - by libps which should be directly obtained from MACH. - 2. The same code which is required to get the information - have to be reused in procfs_nonpid_files.c */ - err = get_live_threads_time (ps, &utime, &stime); - if (! err) - { - new->utime = utime; - new->stime = stime; - } - else - { - new->utime = 0; - new->stime = 0; - } - - err = set_field_value (ps, PSTAT_TASK_BASIC); - if (! err) - { - new->cutime = adjust_jiffy_time ( - ps->task_basic_info->user_time); - new->cstime = adjust_jiffy_time ( - ps->task_basic_info->system_time); - - new->priority = ps->task_basic_info->base_priority; - new->starttime = adjust_jiffy_time ( - ps->task_basic_info->creation_time); - - new->vsize = ps->task_basic_info->virtual_size; - new->rss = ps->task_basic_info->resident_size; - } - else - { - new->cutime = 0; - new->cstime = 0; - new->priority = 0; - new->starttime = 0; - new->vsize = 0; - new->rss = 0; - } - - new->nice = getpriority (0, pid); - - err = set_field_value (ps, PSTAT_NUM_THREADS); - if (! err) - new->num_threads = ps->num_threads; - else - new->num_threads = 0; - - /* Not Supported in Linux 2.6 or later. */ - new->tty_nr = 0; - new->itrealvalue = 0; - new->nswap = 0; - new->cnswap = 0; - - /* Temporarily set to 0 until correct - values are found .*/ - new->cminflt = 0; - new->cmajflt = 0; - new->rlim = 0; - new->startcode = 0; - new->endcode = 0; - new->startstack = 0; - new->kstkesp = 0; - new->kstkeip = 0; - new->signal = 0; - new->blocked = 0; - new->sigignore = 0; - new->sigcatch = 0; - new->wchan = 0; - new->exit_signal = 0; - new->processor = 0; - new->rt_priority = 0; - new->policy = 0; - new->delayacct_blkio_ticks = 0; - - *procfs_stat = new; - _proc_stat_free (ps); - - return err; -} - -/* Reads required process information from stat file - within the directory represented by pid. Return - the data in DATA and actual length to be written - in LEN. */ -error_t -procfs_read_stat_file (struct procfs_dir_entry *dir_entry, - off_t offset, size_t *len, void *data) -{ - error_t err; - char *stat_data; - struct procfs_stat *procfs_stat; - pid_t pid = atoi (dir_entry->dir->node->nn->dir_entry->name); - - err = get_stat_data (pid, &procfs_stat); - - if (asprintf (&stat_data, "%d (%s) %s %d %d %d %d %d %u %lu %lu %lu %lu %lu %lu %ld %ld %ld %ld %ld %ld %llu %lu %ld %lu %lu %lu %lu %lu %lu %lu %lu %lu %lu %lu %lu %lu %d %d %u %u %llu \n", - procfs_stat->pid, procfs_stat->comm, - procfs_stat->state, procfs_stat->ppid, - procfs_stat->pgid, procfs_stat->sid, - procfs_stat->tty_nr, procfs_stat->tty_pgrp, - procfs_stat->flags, procfs_stat->minflt, - procfs_stat->cminflt, procfs_stat->majflt, - procfs_stat->cmajflt, procfs_stat->utime, - procfs_stat->stime, procfs_stat->cutime, - procfs_stat->cstime, procfs_stat->priority, - procfs_stat->nice, procfs_stat->num_threads, - procfs_stat->itrealvalue, procfs_stat->starttime, - procfs_stat->vsize, BYTES_TO_PAGES(procfs_stat->rss), - procfs_stat->rlim, procfs_stat->startcode, - procfs_stat->endcode, procfs_stat->startstack, - procfs_stat->kstkesp, procfs_stat->kstkeip, - procfs_stat->signal, procfs_stat->blocked, - procfs_stat->sigignore, procfs_stat->sigcatch, - procfs_stat->wchan, procfs_stat->nswap, - procfs_stat->cnswap, procfs_stat->exit_signal, - procfs_stat->processor, procfs_stat->rt_priority, - procfs_stat->policy, - procfs_stat->delayacct_blkio_ticks) == -1) - return errno; - - - memcpy (data, stat_data, strlen(stat_data)); - *len = strlen (data); - - free (stat_data); - free (procfs_stat); - - return err; -} - -/* Reads required process's command line information - from cmline file within the directory represented - by pid. Return the data in DATA and actual length - to be written in LEN. */ -error_t -procfs_read_cmdline_file (struct procfs_dir_entry *dir_entry, - off_t offset, size_t *len, void *data) -{ - char *cmdline_data; - error_t err; - struct proc_stat *ps; - pid_t pid = atoi (dir_entry->dir->node->nn->dir_entry->name); - err = _proc_stat_create (pid, ps_context, &ps); - - err = set_field_value (ps, PSTAT_ARGS); - - if (! err) - if (asprintf (&cmdline_data, "%s \n", ps->args) == -1) - return errno; - - memcpy (data, cmdline_data, strlen(cmdline_data)); - *len = strlen (data); - - _proc_stat_free (ps); - free (cmdline_data); - return err; -} - -/* Reads required process's information that is represented by - stat and statm in a human readable format from status file - within the directory represented by pid. Return the data - in DATA and actual length to be written in LEN. */ -error_t -procfs_read_status_file (struct procfs_dir_entry *dir_entry, - off_t offset, size_t *len, void *data) -{ - char *status_data; - error_t err; - struct proc_stat *ps; - struct procfs_stat *procfs_stat; - - pid_t pid = atoi (dir_entry->dir->node->nn->dir_entry->name); - err = _proc_stat_create (pid, ps_context, &ps); - - err = get_stat_data (pid, &procfs_stat); - - if (! err) - if (asprintf (&status_data, "Name:\t%s\nState:\t%s\nTgid:\t%d\nPid:\t%d\n", procfs_stat->comm, procfs_stat->state, procfs_stat->pid, procfs_stat->pid) == -1) - return errno; - - memcpy (data, status_data, strlen(status_data)); - *len = strlen (data); - - _proc_stat_free (ps); - - free (status_data); - free (procfs_stat); - - return err; -} - -/* Reads required process information from statm file - within the directory represented by pid. Return - the data in DATA and actual length to be written - in LEN. */ -error_t -procfs_read_statm_file (struct procfs_dir_entry *dir_entry, - off_t offset, size_t *len, void *data) -{ - char *statm_data; - error_t err; - struct proc_stat *ps; - struct procfs_stat *procfs_stat; - - pid_t pid = atoi (dir_entry->dir->node->nn->dir_entry->name); - err = _proc_stat_create (pid, ps_context, &ps); - - err = get_stat_data (pid, &procfs_stat); - - if (! err) - if (asprintf (&statm_data, "%lu %ld %d %d %d %d %d\n", - BYTES_TO_PAGES(procfs_stat->vsize), - BYTES_TO_PAGES(procfs_stat->rss), - 0, 0, 0, 0, 0) == -1) - return errno; - - memcpy (data, statm_data, strlen(statm_data)); - *len = strlen (data); - - _proc_stat_free (ps); - - free (statm_data); - free (procfs_stat); - - return err; -} - -/* Reads required process information from each of files - within directory represented by pid, for files specified - by NODE. Return the data in DATA and actual length of - data in LEN. */ -error_t -procfs_read_files_contents (struct node *node, - off_t offset, size_t *len, void *data) -{ - error_t err; - - if (! strcmp (node->nn->dir_entry->name, "stat")) - if (! strcmp (node->nn->dir_entry->dir->fs_path, "")) - err = procfs_read_nonpid_stat (node->nn->dir_entry, - offset, len, data); - else - err = procfs_read_stat_file (node->nn->dir_entry, - offset, len, data); - - if (! strcmp (node->nn->dir_entry->name, "cmdline")) - err = procfs_read_cmdline_file (node->nn->dir_entry, - offset, len, data); - - if (! strcmp (node->nn->dir_entry->name, "status")) - err = procfs_read_status_file (node->nn->dir_entry, - offset, len, data); - - if (! strcmp (node->nn->dir_entry->name, "statm")) - err = procfs_read_statm_file (node->nn->dir_entry, - offset, len, data); - - if (! strcmp (node->nn->dir_entry->name, "meminfo")) - if (! strcmp (node->nn->dir_entry->dir->fs_path, "")) - err = procfs_read_nonpid_meminfo (node->nn->dir_entry, - offset, len, data); - else - err = ENOENT; - - if (! strcmp (node->nn->dir_entry->name, "loadavg")) - if (! strcmp (node->nn->dir_entry->dir->fs_path, "")) - err = procfs_read_nonpid_loadavg (node->nn->dir_entry, - offset, len, data); - else - err = ENOENT; - - if (! strcmp (node->nn->dir_entry->name, "uptime")) - if (! strcmp (node->nn->dir_entry->dir->fs_path, "")) - err = procfs_read_nonpid_uptime (node->nn->dir_entry, - offset, len, data); - else - err = ENOENT; - - if (! strcmp (node->nn->dir_entry->name, "version")) - if (! strcmp (node->nn->dir_entry->dir->fs_path, "")) - err = procfs_read_nonpid_version (node->nn->dir_entry, - offset, len, data); - else - err = ENOENT; - - return err; -} diff --git a/proclist.c b/proclist.c new file mode 100644 index 0000000..58b942d --- /dev/null +++ b/proclist.c @@ -0,0 +1,94 @@ +/* Hurd /proc filesystem, list of processes as a directory. + Copyright (C) 2010 Free Software Foundation, Inc. + + This file is part of the GNU Hurd. + + The GNU Hurd is free software; you can redistribute it and/or + modify it under the terms of the GNU General Public License as + published by the Free Software Foundation; either version 2, or (at + your option) any later version. + + The GNU Hurd is distributed in the hope that it will be useful, but + WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ + +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <mach.h> +#include <hurd/process.h> +#include <ps.h> +#include "procfs.h" +#include "process.h" + +#define PID_STR_SIZE (3 * sizeof (pid_t) + 1) + +static error_t +proclist_get_contents (void *hook, char **contents, ssize_t *contents_len) +{ + struct ps_context *pc = hook; + pidarray_t pids; + mach_msg_type_number_t num_pids; + error_t err; + int i; + + num_pids = 0; + err = proc_getallpids (pc->server, &pids, &num_pids); + if (err) + return EIO; + + *contents = malloc (num_pids * PID_STR_SIZE); + if (*contents) + { + *contents_len = 0; + for (i=0; i < num_pids; i++) + { + int n = sprintf (*contents + *contents_len, "%d", pids[i]); + assert (n >= 0); + *contents_len += (n + 1); + } + } + else + err = ENOMEM; + + vm_deallocate (mach_task_self (), (vm_address_t) pids, num_pids * sizeof pids[0]); + return err; +} + +static error_t +proclist_lookup (void *hook, const char *name, struct node **np) +{ + struct ps_context *pc = hook; + char *endp; + pid_t pid; + + /* Self-lookups should not end up here. */ + assert (name[0]); + + /* No leading zeros allowed */ + if (name[0] == '0' && name[1]) + return ENOENT; + + pid = strtol (name, &endp, 10); + if (*endp) + return ENOENT; + + return process_lookup_pid (pc, pid, np); +} + +struct node * +proclist_make_node (struct ps_context *pc) +{ + static const struct procfs_node_ops ops = { + .get_contents = proclist_get_contents, + .lookup = proclist_lookup, + .cleanup_contents = procfs_cleanup_contents_with_free, + }; + return procfs_make_node (&ops, pc); +} + diff --git a/proclist.h b/proclist.h new file mode 100644 index 0000000..bfe95b3 --- /dev/null +++ b/proclist.h @@ -0,0 +1,23 @@ +/* Hurd /proc filesystem, list of processes as a directory. + Copyright (C) 2010 Free Software Foundation, Inc. + + This file is part of the GNU Hurd. + + The GNU Hurd is free software; you can redistribute it and/or + modify it under the terms of the GNU General Public License as + published by the Free Software Foundation; either version 2, or (at + your option) any later version. + + The GNU Hurd is distributed in the hope that it will be useful, but + WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ + +#include <ps.h> + +struct node * +proclist_make_node (struct ps_context *pc); diff --git a/rootdir.c b/rootdir.c new file mode 100644 index 0000000..1fa71b0 --- /dev/null +++ b/rootdir.c @@ -0,0 +1,506 @@ +/* Hurd /proc filesystem, permanent files of the root directory. + Copyright (C) 2010 Free Software Foundation, Inc. + + This file is part of the GNU Hurd. + + The GNU Hurd is free software; you can redistribute it and/or + modify it under the terms of the GNU General Public License as + published by the Free Software Foundation; either version 2, or (at + your option) any later version. + + The GNU Hurd is distributed in the hope that it will be useful, but + WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ + +#include <mach/vm_param.h> +#include <mach/vm_statistics.h> +#include <mach/default_pager.h> +#include <hurd/paths.h> +#include <stdio.h> +#include <unistd.h> +#include <fcntl.h> +#include <sys/time.h> +#include <sys/utsname.h> +#include <sys/stat.h> +#include <argz.h> +#include <ps.h> +#include "procfs.h" +#include "procfs_dir.h" +#include "main.h" + +/* This implements a directory node with the static files in /proc. + NB: the libps functions for host information return static storage; + using them would require locking and as a consequence it would be + more complicated, not simpler. */ + + +/* Helper functions */ + +/* We get the boot time by using that of the kernel process. */ +static error_t +get_boottime (struct ps_context *pc, struct timeval *tv) +{ + struct proc_stat *ps; + error_t err; + + err = _proc_stat_create (opt_kernel_pid, pc, &ps); + if (err) + return err; + + err = proc_stat_set_flags (ps, PSTAT_TASK_BASIC); + if (err || !(proc_stat_flags (ps) & PSTAT_TASK_BASIC)) + err = EIO; + + if (! err) + { + task_basic_info_t tbi = proc_stat_task_basic_info (ps); + tv->tv_sec = tbi->creation_time.seconds; + tv->tv_usec = tbi->creation_time.microseconds; + } + + _proc_stat_free (ps); + return err; +} + +/* We get the idle time by querying the kernel's idle thread. */ +static error_t +get_idletime (struct ps_context *pc, struct timeval *tv) +{ + struct proc_stat *ps, *pst; + thread_basic_info_t tbi; + error_t err; + int i; + + err = _proc_stat_create (opt_kernel_pid, pc, &ps); + if (err) + return err; + + pst = NULL, tbi = NULL; + + err = proc_stat_set_flags (ps, PSTAT_NUM_THREADS); + if (err || !(proc_stat_flags (ps) & PSTAT_NUM_THREADS)) + { + err = EIO; + goto out; + } + + /* Look for the idle thread */ + for (i=0; !tbi || !(tbi->flags & TH_FLAGS_IDLE); i++) + { + if (pst) + _proc_stat_free (pst); + + pst = NULL, tbi = NULL; + if (i >= proc_stat_num_threads (ps)) + { + err = ESRCH; + goto out; + } + + err = proc_stat_thread_create (ps, i, &pst); + if (err) + continue; + + err = proc_stat_set_flags (pst, PSTAT_THREAD_BASIC); + if (err || ! (proc_stat_flags (pst) & PSTAT_THREAD_BASIC)) + continue; + + tbi = proc_stat_thread_basic_info (pst); + } + + /* We found it! */ + tv->tv_sec = tbi->system_time.seconds; + tv->tv_usec = tbi->system_time.microseconds; + err = 0; + +out: + if (pst) _proc_stat_free (pst); + _proc_stat_free (ps); + return err; +} + +static error_t +get_swapinfo (default_pager_info_t *info) +{ + mach_port_t defpager; + error_t err; + + defpager = file_name_lookup (_SERVERS_DEFPAGER, O_READ, 0); + if (defpager == MACH_PORT_NULL) + return errno; + + err = default_pager_info (defpager, info); + mach_port_deallocate (mach_task_self (), defpager); + + return err; +} + + +/* Content generators */ + +static error_t +rootdir_gc_version (void *hook, char **contents, ssize_t *contents_len) +{ + struct utsname uts; + int r; + + r = uname (&uts); + if (r < 0) + return errno; + + *contents_len = asprintf (contents, + "Linux version 2.6.1 (%s %s %s %s)\n", + uts.sysname, uts.release, uts.version, uts.machine); + + return 0; +} + +static error_t +rootdir_gc_uptime (void *hook, char **contents, ssize_t *contents_len) +{ + struct timeval time, boottime, idletime; + double up_secs, idle_secs; + error_t err; + + err = gettimeofday (&time, NULL); + if (err < 0) + return errno; + + err = get_boottime (hook, &boottime); + if (err) + return err; + + err = get_idletime (hook, &idletime); + if (err) + return err; + + timersub (&time, &boottime, &time); + up_secs = (time.tv_sec * 1000000. + time.tv_usec) / 1000000.; + idle_secs = (idletime.tv_sec * 1000000. + idletime.tv_usec) / 1000000.; + + /* The second field is the total idle time. As far as I know we don't + keep track of it. However, procps uses it to compute "USER_HZ", and + proc(5) specifies that it should be equal to USER_HZ times the idle value + in ticks from /proc/stat. So we assume a completely idle system both here + and there to make that work. */ + *contents_len = asprintf (contents, "%.2lf %.2lf\n", up_secs, idle_secs); + + return 0; +} + +static error_t +rootdir_gc_stat (void *hook, char **contents, ssize_t *contents_len) +{ + struct timeval boottime, time, idletime; + struct vm_statistics vmstats; + unsigned long up_ticks, idle_ticks; + error_t err; + + err = gettimeofday (&time, NULL); + if (err < 0) + return errno; + + err = get_boottime (hook, &boottime); + if (err) + return err; + + err = get_idletime (hook, &idletime); + if (err) + return err; + + err = vm_statistics (mach_task_self (), &vmstats); + if (err) + return EIO; + + timersub (&time, &boottime, &time); + up_ticks = opt_clk_tck * (time.tv_sec * 1000000. + time.tv_usec) / 1000000.; + idle_ticks = opt_clk_tck * (idletime.tv_sec * 1000000. + idletime.tv_usec) / 1000000.; + + *contents_len = asprintf (contents, + "cpu %lu 0 0 %lu 0 0 0 0 0\n" + "cpu0 %lu 0 0 %lu 0 0 0 0 0\n" + "intr 0\n" + "page %d %d\n" + "btime %lu\n", + up_ticks - idle_ticks, idle_ticks, + up_ticks - idle_ticks, idle_ticks, + vmstats.pageins, vmstats.pageouts, + boottime.tv_sec); + + return 0; +} + +static error_t +rootdir_gc_loadavg (void *hook, char **contents, ssize_t *contents_len) +{ + host_load_info_data_t hli; + mach_msg_type_number_t cnt; + error_t err; + + cnt = HOST_LOAD_INFO_COUNT; + err = host_info (mach_host_self (), HOST_LOAD_INFO, (host_info_t) &hli, &cnt); + if (err) + return err; + + assert (cnt == HOST_LOAD_INFO_COUNT); + *contents_len = asprintf (contents, + "%.2f %.2f %.2f 1/0 0\n", + hli.avenrun[0] / (double) LOAD_SCALE, + hli.avenrun[1] / (double) LOAD_SCALE, + hli.avenrun[2] / (double) LOAD_SCALE); + + return 0; +} + +static error_t +rootdir_gc_meminfo (void *hook, char **contents, ssize_t *contents_len) +{ + host_basic_info_data_t hbi; + mach_msg_type_number_t cnt; + struct vm_statistics vmstats; + default_pager_info_t swap; + error_t err; + + err = vm_statistics (mach_task_self (), &vmstats); + if (err) + return EIO; + + cnt = HOST_BASIC_INFO_COUNT; + err = host_info (mach_host_self (), HOST_BASIC_INFO, (host_info_t) &hbi, &cnt); + if (err) + return err; + + err = get_swapinfo (&swap); + if (err) + return err; + + assert (cnt == HOST_BASIC_INFO_COUNT); + *contents_len = asprintf (contents, + "MemTotal: %14lu kB\n" + "MemFree: %14lu kB\n" + "Buffers: %14lu kB\n" + "Cached: %14lu kB\n" + "Active: %14lu kB\n" + "Inactive: %14lu kB\n" + "Mlocked: %14lu kB\n" + "SwapTotal:%14lu kB\n" + "SwapFree: %14lu kB\n" + , + (long unsigned) hbi.memory_size / 1024, + (long unsigned) vmstats.free_count * PAGE_SIZE / 1024, + 0, + 0, + (long unsigned) vmstats.active_count * PAGE_SIZE / 1024, + (long unsigned) vmstats.inactive_count * PAGE_SIZE / 1024, + (long unsigned) vmstats.wire_count * PAGE_SIZE / 1024, + (long unsigned) swap.dpi_total_space / 1024, + (long unsigned) swap.dpi_free_space / 1024); + + return 0; +} + +static error_t +rootdir_gc_vmstat (void *hook, char **contents, ssize_t *contents_len) +{ + host_basic_info_data_t hbi; + mach_msg_type_number_t cnt; + struct vm_statistics vmstats; + error_t err; + + err = vm_statistics (mach_task_self (), &vmstats); + if (err) + return EIO; + + cnt = HOST_BASIC_INFO_COUNT; + err = host_info (mach_host_self (), HOST_BASIC_INFO, (host_info_t) &hbi, &cnt); + if (err) + return err; + + assert (cnt == HOST_BASIC_INFO_COUNT); + *contents_len = asprintf (contents, + "nr_free_pages %lu\n" + "nr_inactive_anon %lu\n" + "nr_active_anon %lu\n" + "nr_inactive_file %lu\n" + "nr_active_file %lu\n" + "nr_unevictable %lu\n" + "nr_mlock %lu\n" + "pgpgin %lu\n" + "pgpgout %lu\n" + "pgfault %lu\n", + (long unsigned) vmstats.free_count, + /* FIXME: how can we distinguish the anon/file pages? Maybe we can + ask the default pager how many it manages? */ + (long unsigned) vmstats.inactive_count, + (long unsigned) vmstats.active_count, + (long unsigned) 0, + (long unsigned) 0, + (long unsigned) vmstats.wire_count, + (long unsigned) vmstats.wire_count, + (long unsigned) vmstats.pageins, + (long unsigned) vmstats.pageouts, + (long unsigned) vmstats.faults); + + return 0; +} + +static error_t +rootdir_gc_cmdline (void *hook, char **contents, ssize_t *contents_len) +{ + struct ps_context *pc = hook; + struct proc_stat *ps; + error_t err; + + err = _proc_stat_create (opt_kernel_pid, pc, &ps); + if (err) + return EIO; + + err = proc_stat_set_flags (ps, PSTAT_ARGS); + if (err || ! (proc_stat_flags (ps) & PSTAT_ARGS)) + { + err = EIO; + goto out; + } + + *contents_len = proc_stat_args_len (ps); + *contents = malloc (*contents_len); + if (! *contents) + { + err = ENOMEM; + goto out; + } + + memcpy (*contents, proc_stat_args (ps), *contents_len); + argz_stringify (*contents, *contents_len, ' '); + (*contents)[*contents_len - 1] = '\n'; + +out: + _proc_stat_free (ps); + return err; +} + +static int +rootdir_fakeself_exists () +{ + return opt_fake_self >= 0; +} + +static error_t +rootdir_gc_fakeself (void *hook, char **contents, ssize_t *contents_len) +{ + *contents_len = asprintf (contents, "%d", opt_fake_self); + return 0; +} + + +/* Glue logic and entries table */ + +static struct node * +rootdir_file_make_node (void *dir_hook, const void *entry_hook) +{ + /* The entry hook we use is actually a procfs_node_ops for the file to be + created. The hook associated to these newly created files (and passed + to the generators above as a consequence) is always the same global + ps_context, which we get from rootdir_make_node as the directory hook. */ + return procfs_make_node (entry_hook, dir_hook); +} + +static struct node * +rootdir_symlink_make_node (void *dir_hook, const void *entry_hook) +{ + struct node *np = procfs_make_node (entry_hook, dir_hook); + if (np) + procfs_node_chtype (np, S_IFLNK); + return np; +} + +static const struct procfs_dir_entry rootdir_entries[] = { + { + .name = "self", + .hook = & (struct procfs_node_ops) { + .get_contents = rootdir_gc_fakeself, + .cleanup_contents = procfs_cleanup_contents_with_free, + }, + .ops = { + .make_node = rootdir_symlink_make_node, + .exists = rootdir_fakeself_exists, + } + }, + { + .name = "version", + .hook = & (struct procfs_node_ops) { + .get_contents = rootdir_gc_version, + .cleanup_contents = procfs_cleanup_contents_with_free, + }, + }, + { + .name = "uptime", + .hook = & (struct procfs_node_ops) { + .get_contents = rootdir_gc_uptime, + .cleanup_contents = procfs_cleanup_contents_with_free, + }, + }, + { + .name = "stat", + .hook = & (struct procfs_node_ops) { + .get_contents = rootdir_gc_stat, + .cleanup_contents = procfs_cleanup_contents_with_free, + }, + }, + { + .name = "loadavg", + .hook = & (struct procfs_node_ops) { + .get_contents = rootdir_gc_loadavg, + .cleanup_contents = procfs_cleanup_contents_with_free, + }, + }, + { + .name = "meminfo", + .hook = & (struct procfs_node_ops) { + .get_contents = rootdir_gc_meminfo, + .cleanup_contents = procfs_cleanup_contents_with_free, + }, + }, + { + .name = "vmstat", + .hook = & (struct procfs_node_ops) { + .get_contents = rootdir_gc_vmstat, + .cleanup_contents = procfs_cleanup_contents_with_free, + }, + }, + { + .name = "cmdline", + .hook = & (struct procfs_node_ops) { + .get_contents = rootdir_gc_cmdline, + .cleanup_contents = procfs_cleanup_contents_with_free, + }, + }, +#ifdef PROFILE + /* In order to get a usable gmon.out file, we must apparently use exit(). */ + { + .name = "exit", + .ops = { + .make_node = exit, + }, + }, +#endif + {} +}; + +struct node +*rootdir_make_node (struct ps_context *pc) +{ + static const struct procfs_dir_ops ops = { + .entries = rootdir_entries, + .entry_ops = { + .make_node = rootdir_file_make_node, + }, + }; + return procfs_dir_make_node (&ops, pc); +} + diff --git a/rootdir.h b/rootdir.h new file mode 100644 index 0000000..6980da8 --- /dev/null +++ b/rootdir.h @@ -0,0 +1,23 @@ +/* Hurd /proc filesystem, permanent files of the root directory. + Copyright (C) 2010 Free Software Foundation, Inc. + + This file is part of the GNU Hurd. + + The GNU Hurd is free software; you can redistribute it and/or + modify it under the terms of the GNU General Public License as + published by the Free Software Foundation; either version 2, or (at + your option) any later version. + + The GNU Hurd is distributed in the hope that it will be useful, but + WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ + +#include <ps.h> + +struct node * +rootdir_make_node (struct ps_context *pc); |