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-rw-r--r--rootdir.c506
1 files changed, 506 insertions, 0 deletions
diff --git a/rootdir.c b/rootdir.c
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index 0000000..1fa71b0
--- /dev/null
+++ b/rootdir.c
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+/* 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);
+}
+