2002-06-14 Roland McGrath <roland@frob.com>

	* proxy-defpager.c: New file.
	* Makefile (targets, SRCS): Add it.
	(proxy-defpager): New target.
	(OBJS): Add default_pagerServer.o here.

1 files changed, 255 insertions, 0 deletions

diff --git a/trans/proxy-defpager.c b/trans/proxy-defpager.c
new file mode 100644
index 00000000..d4c8d753
--- /dev/null
+++ b/trans/proxy-defpager.c
@@ -0,0 +1,255 @@
+/* A translator for providing access to Mach default_pager.defs control calls
+
+   Copyright (C) 2002 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. */
+
+#include <hurd/trivfs.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <argp.h>
+#include <error.h>
+#include <version.h>
+#include <hurd/paths.h>
+
+#include "default_pager_S.h"
+
+static mach_port_t real_defpager, dev_master;
+
+static error_t
+allowed (mach_port_t port, int mode)
+{
+  struct trivfs_protid *cred = ports_lookup_port
+    (0, port, trivfs_protid_portclasses[0]);
+  if (port == 0)
+    return MIG_BAD_ID;
+  error_t result = (cred->po->openmodes & mode) ? 0 : EACCES;
+  ports_port_deref (cred);
+  return result;
+}
+
+kern_return_t
+default_pager_object_create (mach_port_t default_pager,
+			     memory_object_t *memory_object,
+			     vm_size_t object_size)
+{
+  return allowed (default_pager, O_EXEC)
+    ?: default_pager_object_create (real_defpager, memory_object, object_size);
+}
+
+kern_return_t
+default_pager_info (mach_port_t default_pager, default_pager_info_t *info)
+{
+  return allowed (default_pager, O_READ)
+    ?: default_pager_info (default_pager, info);
+}
+
+kern_return_t
+default_pager_objects (mach_port_t default_pager,
+		       default_pager_object_array_t *objects,
+		       mach_msg_type_number_t *objectsCnt,
+		       mach_port_array_t *ports,
+		       mach_msg_type_number_t *portsCnt)
+{
+  return allowed (default_pager, O_WRITE)
+    ?: default_pager_objects (real_defpager,
+			      objects, objectsCnt, ports, portsCnt);
+}
+
+kern_return_t
+default_pager_paging_file (mach_port_t default_pager,
+			   mach_port_t master_device_port,
+			   default_pager_filename_t filename,
+			   boolean_t add)
+{
+  return allowed (default_pager, O_WRITE)
+    ?: default_pager_paging_file (real_defpager, dev_master, filename, add)
+    ?: mach_port_deallocate (mach_task_self (), master_device_port);
+}
+
+kern_return_t
+default_pager_paging_storage (mach_port_t default_pager,
+			      mach_port_t device,
+			      recnum_t *runs, mach_msg_type_number_t nruns,
+			      default_pager_filename_t name,
+			      boolean_t add)
+{
+  return allowed (default_pager, O_WRITE)
+    ?: default_pager_paging_storage (real_defpager, dev_master,
+				     runs, nruns, name, add)
+    ?: mach_port_deallocate (mach_task_self (), device);
+}
+
+kern_return_t
+default_pager_object_set_size (mach_port_t memory_object,
+			       mach_port_t reply_port,
+			       mach_port_seqno_t seqno,
+			       vm_size_t object_size_limit)
+{
+  /* This is sent to an object, not the control port.  */
+  return MIG_BAD_ID;
+}
+
+
+/* Trivfs hooks  */
+
+int trivfs_fstype = FSTYPE_MISC;
+int trivfs_fsid;
+
+int trivfs_support_read = 1;
+int trivfs_support_write = 1;
+int trivfs_support_exec = 1;
+
+int trivfs_allow_open = O_READ | O_WRITE | O_EXEC;
+
+void
+trivfs_modify_stat (struct trivfs_protid *cred, struct stat *st)
+{
+  st->st_blksize = vm_page_size * 256; /* Make transfers LARRRRRGE */
+
+  st->st_size = 0;
+  st->st_blocks = 0;
+
+  st->st_mode &= ~S_IFMT;
+  st->st_mode |= S_IFCHR;
+}
+
+
+error_t
+trivfs_goaway (struct trivfs_control *fsys, int flags)
+{
+  exit (0);
+}
+
+kern_return_t
+trivfs_S_io_read (struct trivfs_protid *cred,
+		  mach_port_t reply, mach_msg_type_name_t replytype,
+		  char **data,
+		  mach_msg_type_number_t *datalen,
+		  loff_t offs,
+		  mach_msg_type_number_t amt)
+{
+  if (!cred)
+    return EOPNOTSUPP;
+  return EIO;
+}
+
+kern_return_t
+trivfs_S_io_write (struct trivfs_protid *cred,
+		   mach_port_t reply, mach_msg_type_name_t replytype,
+		   char *data, mach_msg_type_number_t datalen,
+		   loff_t offs, mach_msg_type_number_t *amt)
+{
+  if (!cred)
+    return EOPNOTSUPP;
+  return EIO;
+}
+
+kern_return_t
+trivfs_S_io_get_openmodes (struct trivfs_protid *cred,
+			   mach_port_t reply, mach_msg_type_name_t replytype,
+			   int *bits)
+{
+  if (!cred)
+    return EOPNOTSUPP;
+  else
+    {
+      *bits = cred->po->openmodes;
+      return 0;
+    }
+}
+
+error_t
+trivfs_S_io_set_all_openmodes (struct trivfs_protid *cred,
+			       mach_port_t reply,
+			       mach_msg_type_name_t replytype,
+			       int mode)
+{
+  if (!cred)
+    return EOPNOTSUPP;
+  else
+    return 0;
+}
+
+kern_return_t
+trivfs_S_io_set_some_openmodes (struct trivfs_protid *cred,
+				mach_port_t reply,
+				mach_msg_type_name_t replytype,
+				int bits)
+{
+  if (!cred)
+    return EOPNOTSUPP;
+  else
+    return 0;
+}
+
+kern_return_t
+trivfs_S_io_clear_some_openmodes (struct trivfs_protid *cred,
+				  mach_port_t reply,
+				  mach_msg_type_name_t replytype,
+				  int bits)
+{
+  if (!cred)
+    return EOPNOTSUPP;
+  else
+    return 0;
+}
+
+const char *argp_program_version = STANDARD_HURD_VERSION (proxy-defpager);
+
+static const struct argp argp =
+{doc: "\
+Access to control interfaces of Mach default pager.\n\
+This translator should normally be set on " _SERVERS_DEFPAGER "."};
+
+int
+main (int argc, char **argv)
+{
+  error_t err;
+  mach_port_t bootstrap;
+  struct trivfs_control *fsys;
+  mach_port_t host_priv;
+
+  argp_parse (&argp, argc, argv, 0, 0, 0);
+
+  err = get_privileged_ports (&host_priv, &dev_master);
+  if (err)
+    error (2, err, "cannot get privileged ports");
+  real_defpager = MACH_PORT_NULL;
+  err = vm_set_default_memory_manager (host_priv, &real_defpager);
+  mach_port_deallocate (mach_task_self (), host_priv);
+  if (err)
+    error (3, err, "vm_set_default_memory_manager");
+  if (real_defpager == MACH_PORT_NULL)
+    error (1, 0, "no default memory manager set!");
+
+  task_get_bootstrap_port (mach_task_self (), &bootstrap);
+  if (bootstrap == MACH_PORT_NULL)
+    error (1, 0, "Must be started as a translator");
+
+  trivfs_fsid = getpid ();
+
+  /* Reply to our parent.  */
+  err = trivfs_startup (bootstrap, 0, 0, 0, 0, 0, &fsys);
+  mach_port_deallocate (mach_task_self (), bootstrap);
+  if (err)
+    error (4, err, "Contacting parent");
+
+  /* Launch. */
+  ports_manage_port_operations_multithread (fsys->pi.bucket, trivfs_demuxer,
+					    2 * 60 * 1000, 0, 0);
+
+  return 0;
+}