Move shared native target specific code to gdb/nat

https://sourceware.org/gdb/wiki/Common describes the following
directory structure:

 gdb/nat/
   Native target backend files. Code that interfaces with the
   host debug API. E.g., ptrace code, Windows debug API code,
   procfs code should go here.

 gdb/target/
   Host-independent, target vector specific code (target_ops).

 gdb/common/
   All other shared code.

This commit moves all native target backend files currently in
gdb/common to gdb/nat.

gdb/
2014-06-20  Gary Benson  <gbenson@redhat.com>

	* common/gdb_thread_db.h: Moved to nat.  All includes updated.
	* common/glibc_thread_db.h: Likewise.
	* common/i386-cpuid.h: Likewise.
	* common/i386-gcc-cpuid.h: Likewise.
	* common/linux-btrace.h: Likewise.
	* common/linux-osdata.h: Likewise.
	* common/linux-procfs.h: Likewise.
	* common/linux-ptrace.h: Likewise.
	* common/mips-linux-watch.h: Likewise.
	* common/linux-btrace.c: Moved to nat.
	* common/linux-osdata.c: Likewise.
	* common/linux-procfs.c: Likewise.
	* common/linux-ptrace.c: Likewise.
	* common/mips-linux-watch.c: Likewise.
	* nat/gdb_thread_db.h: Moved from common.
	* nat/glibc_thread_db.h: Likewise.
	* nat/i386-cpuid.h: Likewise.
	* nat/i386-gcc-cpuid.h: Likewise.
	* nat/linux-btrace.c: Likewise.
	* nat/linux-btrace.h: Likewise.
	* nat/linux-osdata.c: Likewise.
	* nat/linux-osdata.h: Likewise.
	* nat/linux-procfs.c: Likewise.
	* nat/linux-procfs.h: Likewise.
	* nat/linux-ptrace.c: Likewise.
	* nat/linux-ptrace.h: Likewise.
	* nat/mips-linux-watch.c: Likewise.
	* nat/mips-linux-watch.h: Likewise.
	* Makefile.in (HFILES_NO_SRCDIR): Reflect new locations.
	(object file files): Reordered.
	* gdb/copyright.py (EXCLUDE_LIST): Reflect new location
	of glibc_thread_db.h.

gdb/gdbserver/
2014-06-20  Gary Benson  <gbenson@redhat.com>

	* Makefile.in (SFILES): Update locations for files moved
	from common to nat.
	(object file files): Reordered.

gdb/testsuite/
2014-06-20  Gary Benson  <gbenson@redhat.com>

	* gdb.arch/i386-avx.exp: Fix include file location.
	* gdb.arch/i386-sse.exp: Likewise.

1 files changed, 1634 insertions, 0 deletions

diff --git a/gdb/nat/linux-osdata.c b/gdb/nat/linux-osdata.c
new file mode 100644
index 0000000..dae637b
--- /dev/null
+++ b/gdb/nat/linux-osdata.c
@@ -0,0 +1,1634 @@
+/* Linux-specific functions to retrieve OS data.
+   
+   Copyright (C) 2009-2014 Free Software Foundation, Inc.
+
+   This file is part of GDB.
+
+   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 3 of the License, 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, see <http://www.gnu.org/licenses/>.  */
+
+#ifdef GDBSERVER
+#include "server.h"
+#else
+#include "defs.h"
+#endif
+
+#include "linux-osdata.h"
+
+#include <sys/types.h>
+#include <sys/sysinfo.h>
+#include <ctype.h>
+#include <stdlib.h>
+#include <string.h>
+#include <utmp.h>
+#include <time.h>
+#include <unistd.h>
+#include <pwd.h>
+#include <grp.h>
+#include <netdb.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+
+#include "xml-utils.h"
+#include "buffer.h"
+#include "gdb_assert.h"
+#include <dirent.h>
+#include <sys/stat.h>
+#include "filestuff.h"
+
+#define NAMELEN(dirent) strlen ((dirent)->d_name)
+
+/* Define PID_T to be a fixed size that is at least as large as pid_t,
+   so that reading pid values embedded in /proc works
+   consistently.  */
+
+typedef long long  PID_T;
+
+/* Define TIME_T to be at least as large as time_t, so that reading
+   time values embedded in /proc works consistently.  */
+
+typedef long long TIME_T;
+
+#define MAX_PID_T_STRLEN  (sizeof ("-9223372036854775808") - 1)
+
+/* Returns the CPU core that thread PTID is currently running on.  */
+					  
+/* Compute and return the processor core of a given thread.  */
+
+int
+linux_common_core_of_thread (ptid_t ptid)
+{
+  char filename[sizeof ("/proc//task//stat") + 2 * MAX_PID_T_STRLEN];
+  FILE *f;
+  char *content = NULL;
+  char *p;
+  char *ts = 0;
+  int content_read = 0;
+  int i;
+  int core;
+
+  sprintf (filename, "/proc/%lld/task/%lld/stat",
+	   (PID_T) ptid_get_pid (ptid), (PID_T) ptid_get_lwp (ptid));
+  f = gdb_fopen_cloexec (filename, "r");
+  if (!f)
+    return -1;
+
+  for (;;)
+    {
+      int n;
+      content = xrealloc (content, content_read + 1024);
+      n = fread (content + content_read, 1, 1024, f);
+      content_read += n;
+      if (n < 1024)
+	{
+	  content[content_read] = '\0';
+	  break;
+	}
+    }
+
+  /* ps command also relies on no trailing fields ever contain ')'.  */
+  p = strrchr (content, ')');
+  if (p != NULL)
+    p++;
+
+  /* If the first field after program name has index 0, then core number is
+     the field with index 36.  There's no constant for that anywhere.  */
+  if (p != NULL)
+    p = strtok_r (p, " ", &ts);
+  for (i = 0; p != NULL && i != 36; ++i)
+    p = strtok_r (NULL, " ", &ts);
+
+  if (p == NULL || sscanf (p, "%d", &core) == 0)
+    core = -1;
+
+  xfree (content);
+  fclose (f);
+
+  return core;
+}
+
+/* Finds the command-line of process PID and copies it into COMMAND.
+   At most MAXLEN characters are copied.  If the command-line cannot
+   be found, PID is copied into command in text-form.  */
+
+static void
+command_from_pid (char *command, int maxlen, PID_T pid)
+{
+  char *stat_path = xstrprintf ("/proc/%lld/stat", pid); 
+  FILE *fp = gdb_fopen_cloexec (stat_path, "r");
+  
+  command[0] = '\0';
+ 
+  if (fp)
+    {
+      /* sizeof (cmd) should be greater or equal to TASK_COMM_LEN (in
+	 include/linux/sched.h in the Linux kernel sources) plus two
+	 (for the brackets).  */
+      char cmd[18];
+      PID_T stat_pid;
+      int items_read = fscanf (fp, "%lld %17s", &stat_pid, cmd);
+	  
+      if (items_read == 2 && pid == stat_pid)
+	{
+	  cmd[strlen (cmd) - 1] = '\0'; /* Remove trailing parenthesis.  */
+	  strncpy (command, cmd + 1, maxlen); /* Ignore leading parenthesis.  */
+	}
+
+      fclose (fp);
+    }
+  else
+    {
+      /* Return the PID if a /proc entry for the process cannot be found.  */
+      snprintf (command, maxlen, "%lld", pid);
+    }
+
+  command[maxlen - 1] = '\0'; /* Ensure string is null-terminated.  */
+	
+  xfree (stat_path);
+}
+
+/* Returns the command-line of the process with the given PID. The
+   returned string needs to be freed using xfree after use.  */
+
+static char *
+commandline_from_pid (PID_T pid)
+{
+  char *pathname = xstrprintf ("/proc/%lld/cmdline", pid);
+  char *commandline = NULL;
+  FILE *f = gdb_fopen_cloexec (pathname, "r");
+
+  if (f)
+    {
+      size_t len = 0;
+
+      while (!feof (f))
+	{
+	  char buf[1024];
+	  size_t read_bytes = fread (buf, 1, sizeof (buf), f);
+     
+	  if (read_bytes)
+	    {
+	      commandline = (char *) xrealloc (commandline, len + read_bytes + 1);
+	      memcpy (commandline + len, buf, read_bytes);
+	      len += read_bytes;
+	    }
+	}
+
+      fclose (f);
+
+      if (commandline)
+	{
+	  size_t i;
+
+	  /* Replace null characters with spaces.  */
+	  for (i = 0; i < len; ++i)
+	    if (commandline[i] == '\0')
+	      commandline[i] = ' ';
+
+	  commandline[len] = '\0';
+	}
+      else
+	{
+	  /* Return the command in square brackets if the command-line
+	     is empty.  */
+	  commandline = (char *) xmalloc (32);
+	  commandline[0] = '[';
+	  command_from_pid (commandline + 1, 31, pid);
+
+	  len = strlen (commandline);
+	  if (len < 31)
+	    strcat (commandline, "]");
+	}
+    }
+
+  xfree (pathname);
+
+  return commandline;
+}
+
+/* Finds the user name for the user UID and copies it into USER.  At
+   most MAXLEN characters are copied.  */
+
+static void
+user_from_uid (char *user, int maxlen, uid_t uid)
+{
+  struct passwd *pwentry = getpwuid (uid);
+  
+  if (pwentry)
+    {
+      strncpy (user, pwentry->pw_name, maxlen);
+      /* Ensure that the user name is null-terminated.  */
+      user[maxlen - 1] = '\0';
+    }
+  else
+    user[0] = '\0';
+}
+
+/* Finds the owner of process PID and returns the user id in OWNER.
+   Returns 0 if the owner was found, -1 otherwise.  */
+
+static int
+get_process_owner (uid_t *owner, PID_T pid)
+{
+  struct stat statbuf;
+  char procentry[sizeof ("/proc/") + MAX_PID_T_STRLEN];
+
+  sprintf (procentry, "/proc/%lld", pid);
+  
+  if (stat (procentry, &statbuf) == 0 && S_ISDIR (statbuf.st_mode))
+    {
+      *owner = statbuf.st_uid;
+      return 0;
+    }
+  else
+    return -1;
+}
+
+/* Find the CPU cores used by process PID and return them in CORES.
+   CORES points to an array of NUM_CORES elements.  */
+
+static int
+get_cores_used_by_process (PID_T pid, int *cores, const int num_cores)
+{
+  char taskdir[sizeof ("/proc/") + MAX_PID_T_STRLEN + sizeof ("/task") - 1];
+  DIR *dir;
+  struct dirent *dp;
+  int task_count = 0;
+
+  sprintf (taskdir, "/proc/%lld/task", pid);
+  dir = opendir (taskdir);
+  if (dir)
+    {
+      while ((dp = readdir (dir)) != NULL)
+	{
+	  PID_T tid;
+	  int core;
+
+	  if (!isdigit (dp->d_name[0])
+	      || NAMELEN (dp) > MAX_PID_T_STRLEN)
+	    continue;
+
+	  sscanf (dp->d_name, "%lld", &tid);
+	  core = linux_common_core_of_thread (ptid_build ((pid_t) pid,
+							  (pid_t) tid, 0));
+
+	  if (core >= 0 && core < num_cores)
+	    {
+	      ++cores[core];
+	      ++task_count;
+	    }
+	}
+
+      closedir (dir);
+    }
+
+  return task_count;
+}
+
+static LONGEST
+linux_xfer_osdata_processes (gdb_byte *readbuf,
+			     ULONGEST offset, ULONGEST len)
+{
+  /* We make the process list snapshot when the object starts to be read.  */
+  static const char *buf;
+  static LONGEST len_avail = -1;
+  static struct buffer buffer;
+
+  if (offset == 0)
+    {
+      DIR *dirp;
+
+      if (len_avail != -1 && len_avail != 0)
+	buffer_free (&buffer);
+      len_avail = 0;
+      buf = NULL;
+      buffer_init (&buffer);
+      buffer_grow_str (&buffer, "<osdata type=\"processes\">\n");
+
+      dirp = opendir ("/proc");
+      if (dirp)
+	{
+	  const int num_cores = sysconf (_SC_NPROCESSORS_ONLN);
+	  struct dirent *dp;
+
+	  while ((dp = readdir (dirp)) != NULL)
+	    {
+	      PID_T pid;
+	      uid_t owner;
+	      char user[UT_NAMESIZE];
+	      char *command_line;
+	      int *cores;
+	      int task_count;
+	      char *cores_str;
+	      int i;
+
+	      if (!isdigit (dp->d_name[0])
+		  || NAMELEN (dp) > MAX_PID_T_STRLEN)
+		continue;
+
+	      sscanf (dp->d_name, "%lld", &pid);
+	      command_line = commandline_from_pid (pid);
+
+	      if (get_process_owner (&owner, pid) == 0)
+		user_from_uid (user, sizeof (user), owner);
+	      else
+		strcpy (user, "?");
+
+	      /* Find CPU cores used by the process.  */
+	      cores = (int *) xcalloc (num_cores, sizeof (int));
+	      task_count = get_cores_used_by_process (pid, cores, num_cores);
+	      cores_str = (char *) xcalloc (task_count, sizeof ("4294967295") + 1);
+
+	      for (i = 0; i < num_cores && task_count > 0; ++i)
+		if (cores[i])
+		  {
+		    char core_str[sizeof ("4294967295")];
+
+		    sprintf (core_str, "%d", i);
+		    strcat (cores_str, core_str);
+
+		    task_count -= cores[i];
+		    if (task_count > 0)
+		      strcat (cores_str, ",");
+		  }
+
+	      xfree (cores);
+	      
+	      buffer_xml_printf (
+		  &buffer,
+		  "<item>"
+		  "<column name=\"pid\">%lld</column>"
+		  "<column name=\"user\">%s</column>"
+		  "<column name=\"command\">%s</column>"
+		  "<column name=\"cores\">%s</column>"
+		  "</item>",
+		  pid,
+		  user,
+		  command_line ? command_line : "",
+		  cores_str);
+
+	      xfree (command_line);     
+	      xfree (cores_str);
+	    }
+	  
+	  closedir (dirp);
+	}
+
+      buffer_grow_str0 (&buffer, "</osdata>\n");
+      buf = buffer_finish (&buffer);
+      len_avail = strlen (buf);
+    }
+
+  if (offset >= len_avail)
+    {
+      /* Done.  Get rid of the buffer.  */
+      buffer_free (&buffer);
+      buf = NULL;
+      len_avail = 0;
+      return 0;
+    }
+
+  if (len > len_avail - offset)
+    len = len_avail - offset;
+  memcpy (readbuf, buf + offset, len);
+
+  return len;
+}
+
+/* Auxiliary function used by qsort to sort processes by process
+   group.  Compares two processes with ids PROCESS1 and PROCESS2.
+   PROCESS1 comes before PROCESS2 if it has a lower process group id.
+   If they belong to the same process group, PROCESS1 comes before
+   PROCESS2 if it has a lower process id or is the process group
+   leader.  */
+
+static int
+compare_processes (const void *process1, const void *process2)
+{
+  PID_T pid1 = *((PID_T *) process1);
+  PID_T pid2 = *((PID_T *) process2);
+  PID_T pgid1 = *((PID_T *) process1 + 1);
+  PID_T pgid2 = *((PID_T *) process2 + 1);
+
+  /* Sort by PGID.  */
+  if (pgid1 < pgid2)
+    return -1;
+  else if (pgid1 > pgid2)
+    return 1;
+  else
+    {
+      /* Process group leaders always come first, else sort by PID.  */
+      if (pid1 == pgid1)
+	return -1;
+      else if (pid2 == pgid2)
+	return 1;
+      else if (pid1 < pid2)
+	return -1;
+      else if (pid1 > pid2)
+	return 1;
+      else
+	return 0;
+    }
+}
+
+/* Collect all process groups from /proc.  */
+
+static LONGEST
+linux_xfer_osdata_processgroups (gdb_byte *readbuf,
+				 ULONGEST offset, ULONGEST len)
+{
+  /* We make the process list snapshot when the object starts to be read.  */
+  static const char *buf;
+  static LONGEST len_avail = -1;
+  static struct buffer buffer;
+
+  if (offset == 0)
+    {
+      DIR *dirp;
+
+      if (len_avail != -1 && len_avail != 0)
+	buffer_free (&buffer);
+      len_avail = 0;
+      buf = NULL;
+      buffer_init (&buffer);
+      buffer_grow_str (&buffer, "<osdata type=\"process groups\">\n");
+
+      dirp = opendir ("/proc");
+      if (dirp)
+	{
+	  struct dirent *dp;
+	  const size_t list_block_size = 512;
+	  PID_T *process_list = (PID_T *) xmalloc (list_block_size * 2 * sizeof (PID_T));
+	  size_t process_count = 0;
+	  size_t i;
+
+	  /* Build list consisting of PIDs followed by their
+	     associated PGID.  */
+	  while ((dp = readdir (dirp)) != NULL)
+	    {
+	      PID_T pid, pgid;
+
+	      if (!isdigit (dp->d_name[0])
+		  || NAMELEN (dp) > MAX_PID_T_STRLEN)
+		continue;
+
+	      sscanf (dp->d_name, "%lld", &pid);
+	      pgid = getpgid (pid);
+
+	      if (pgid > 0)
+		{
+		  process_list[2 * process_count] = pid;
+		  process_list[2 * process_count + 1] = pgid;
+		  ++process_count;
+
+		  /* Increase the size of the list if necessary.  */
+		  if (process_count % list_block_size == 0)
+		    process_list = (PID_T *) xrealloc (
+			process_list,
+			(process_count + list_block_size)
+			* 2 * sizeof (PID_T));
+		}
+	    }
+
+	  closedir (dirp);
+
+	  /* Sort the process list.  */
+	  qsort (process_list, process_count, 2 * sizeof (PID_T),
+		 compare_processes);
+
+	  for (i = 0; i < process_count; ++i)
+	    {
+	      PID_T pid = process_list[2 * i];
+	      PID_T pgid = process_list[2 * i + 1];
+	      char leader_command[32];
+	      char *command_line;
+
+	      command_from_pid (leader_command, sizeof (leader_command), pgid);
+	      command_line = commandline_from_pid (pid);
+
+	      buffer_xml_printf (
+		  &buffer,
+		  "<item>"
+		  "<column name=\"pgid\">%lld</column>"
+		  "<column name=\"leader command\">%s</column>"
+		  "<column name=\"pid\">%lld</column>"
+		  "<column name=\"command line\">%s</column>"
+		  "</item>",
+		  pgid,
+		  leader_command,
+		  pid,
+		  command_line ? command_line : "");
+
+	      xfree (command_line);
+	    }
+
+	  xfree (process_list);
+	}   
+
+      buffer_grow_str0 (&buffer, "</osdata>\n");
+      buf = buffer_finish (&buffer);
+      len_avail = strlen (buf);
+    }
+
+  if (offset >= len_avail)
+    {
+      /* Done.  Get rid of the buffer.  */
+      buffer_free (&buffer);
+      buf = NULL;
+      len_avail = 0;
+      return 0;
+    }
+
+  if (len > len_avail - offset)
+    len = len_avail - offset;
+  memcpy (readbuf, buf + offset, len);
+
+  return len;
+}
+
+/* Collect all the threads in /proc by iterating through processes and
+   then tasks within each process.  */
+
+static LONGEST
+linux_xfer_osdata_threads (gdb_byte *readbuf,
+			   ULONGEST offset, ULONGEST len)
+{
+  /* We make the process list snapshot when the object starts to be read.  */
+  static const char *buf;
+  static LONGEST len_avail = -1;
+  static struct buffer buffer;
+
+  if (offset == 0)
+    {
+      DIR *dirp;
+
+      if (len_avail != -1 && len_avail != 0)
+	buffer_free (&buffer);
+      len_avail = 0;
+      buf = NULL;
+      buffer_init (&buffer);
+      buffer_grow_str (&buffer, "<osdata type=\"threads\">\n");
+
+      dirp = opendir ("/proc");
+      if (dirp)
+	{
+	  struct dirent *dp;
+
+	  while ((dp = readdir (dirp)) != NULL)
+	    {
+	      struct stat statbuf;
+	      char procentry[sizeof ("/proc/4294967295")];
+
+	      if (!isdigit (dp->d_name[0])
+		  || NAMELEN (dp) > sizeof ("4294967295") - 1)
+		continue;
+
+	      sprintf (procentry, "/proc/%s", dp->d_name);
+	      if (stat (procentry, &statbuf) == 0
+		  && S_ISDIR (statbuf.st_mode))
+		{
+		  DIR *dirp2;
+		  char *pathname;
+		  PID_T pid;
+		  char command[32];
+
+		  pathname = xstrprintf ("/proc/%s/task", dp->d_name);
+		  
+		  pid = atoi (dp->d_name);
+		  command_from_pid (command, sizeof (command), pid);
+
+		  dirp2 = opendir (pathname);
+
+		  if (dirp2)
+		    {
+		      struct dirent *dp2;
+
+		      while ((dp2 = readdir (dirp2)) != NULL)
+			{
+			  PID_T tid;
+			  int core;
+
+			  if (!isdigit (dp2->d_name[0])
+			      || NAMELEN (dp2) > sizeof ("4294967295") - 1)
+			    continue;
+
+			  tid = atoi (dp2->d_name);
+			  core = linux_common_core_of_thread (ptid_build (pid, tid, 0));
+
+			  buffer_xml_printf (
+			    &buffer,
+			    "<item>"
+			    "<column name=\"pid\">%lld</column>"
+			    "<column name=\"command\">%s</column>"
+			    "<column name=\"tid\">%lld</column>"
+			    "<column name=\"core\">%d</column>"
+			    "</item>",
+			    pid,
+			    command,
+			    tid,
+			    core);
+			}
+
+		      closedir (dirp2);
+		    }
+
+		  xfree (pathname);
+		}
+	    }
+
+	  closedir (dirp);
+	}
+
+      buffer_grow_str0 (&buffer, "</osdata>\n");
+      buf = buffer_finish (&buffer);
+      len_avail = strlen (buf);
+    }
+
+  if (offset >= len_avail)
+    {
+      /* Done.  Get rid of the buffer.  */
+      buffer_free (&buffer);
+      buf = NULL;
+      len_avail = 0;
+      return 0;
+    }
+
+  if (len > len_avail - offset)
+    len = len_avail - offset;
+  memcpy (readbuf, buf + offset, len);
+
+  return len;
+}
+
+/* Collect all the open file descriptors found in /proc and put the details
+   found about them into READBUF.  */
+
+static LONGEST
+linux_xfer_osdata_fds (gdb_byte *readbuf,
+		       ULONGEST offset, ULONGEST len)
+{
+  /* We make the process list snapshot when the object starts to be read.  */
+  static const char *buf;
+  static LONGEST len_avail = -1;
+  static struct buffer buffer;
+
+  if (offset == 0)
+    {
+      DIR *dirp;
+
+      if (len_avail != -1 && len_avail != 0)
+	buffer_free (&buffer);
+      len_avail = 0;
+      buf = NULL;
+      buffer_init (&buffer);
+      buffer_grow_str (&buffer, "<osdata type=\"files\">\n");
+
+      dirp = opendir ("/proc");
+      if (dirp)
+	{
+	  struct dirent *dp;
+
+	  while ((dp = readdir (dirp)) != NULL)
+	    {
+	      struct stat statbuf;
+	      char procentry[sizeof ("/proc/4294967295")];
+
+	      if (!isdigit (dp->d_name[0])
+		  || NAMELEN (dp) > sizeof ("4294967295") - 1)
+		continue;
+
+	      sprintf (procentry, "/proc/%s", dp->d_name);
+	      if (stat (procentry, &statbuf) == 0
+		  && S_ISDIR (statbuf.st_mode))
+		{
+		  char *pathname;
+		  DIR *dirp2;
+		  PID_T pid;
+		  char command[32];
+
+		  pid = atoi (dp->d_name);
+		  command_from_pid (command, sizeof (command), pid);
+
+		  pathname = xstrprintf ("/proc/%s/fd", dp->d_name);
+		  dirp2 = opendir (pathname);
+
+		  if (dirp2)
+		    {
+		      struct dirent *dp2;
+
+		      while ((dp2 = readdir (dirp2)) != NULL)
+			{
+			  char *fdname;
+			  char buf[1000];
+			  ssize_t rslt;
+
+			  if (!isdigit (dp2->d_name[0]))
+			    continue;
+
+			  fdname = xstrprintf ("%s/%s", pathname, dp2->d_name);
+			  rslt = readlink (fdname, buf, sizeof (buf) - 1);
+			  if (rslt >= 0)
+			    buf[rslt] = '\0';
+
+			  buffer_xml_printf (
+			    &buffer,
+			    "<item>"
+			    "<column name=\"pid\">%s</column>"
+			    "<column name=\"command\">%s</column>"
+			    "<column name=\"file descriptor\">%s</column>"
+			    "<column name=\"name\">%s</column>"
+			    "</item>",
+			    dp->d_name,
+			    command,
+			    dp2->d_name,
+			    (rslt >= 0 ? buf : dp2->d_name));
+			}
+
+		      closedir (dirp2);
+		    }
+
+		  xfree (pathname);
+		}
+	    }
+
+	  closedir (dirp);
+	}
+
+      buffer_grow_str0 (&buffer, "</osdata>\n");
+      buf = buffer_finish (&buffer);
+      len_avail = strlen (buf);
+    }
+
+  if (offset >= len_avail)
+    {
+      /* Done.  Get rid of the buffer.  */
+      buffer_free (&buffer);
+      buf = NULL;
+      len_avail = 0;
+      return 0;
+    }
+
+  if (len > len_avail - offset)
+    len = len_avail - offset;
+  memcpy (readbuf, buf + offset, len);
+
+  return len;
+}
+
+/* Returns the socket state STATE in textual form.  */
+
+static const char *
+format_socket_state (unsigned char state)
+{
+  /* Copied from include/net/tcp_states.h in the Linux kernel sources.  */
+  enum {
+    TCP_ESTABLISHED = 1,
+    TCP_SYN_SENT,
+    TCP_SYN_RECV,
+    TCP_FIN_WAIT1,
+    TCP_FIN_WAIT2,
+    TCP_TIME_WAIT,
+    TCP_CLOSE,
+    TCP_CLOSE_WAIT,
+    TCP_LAST_ACK,
+    TCP_LISTEN,
+    TCP_CLOSING
+  };
+
+  switch (state)
+    {
+    case TCP_ESTABLISHED:
+      return "ESTABLISHED";
+    case TCP_SYN_SENT:
+      return "SYN_SENT";
+    case TCP_SYN_RECV:
+      return "SYN_RECV";
+    case TCP_FIN_WAIT1:
+      return "FIN_WAIT1";
+    case TCP_FIN_WAIT2:
+      return "FIN_WAIT2";
+    case TCP_TIME_WAIT:
+      return "TIME_WAIT";
+    case TCP_CLOSE:
+      return "CLOSE";
+    case TCP_CLOSE_WAIT:
+      return "CLOSE_WAIT";
+    case TCP_LAST_ACK:
+      return "LAST_ACK";
+    case TCP_LISTEN:
+      return "LISTEN";
+    case TCP_CLOSING:
+      return "CLOSING";
+    default:
+      return "(unknown)";
+    }
+}
+
+union socket_addr
+  {
+    struct sockaddr sa;
+    struct sockaddr_in sin;
+    struct sockaddr_in6 sin6;
+  };
+
+/* Auxiliary function used by linux_xfer_osdata_isocket.  Formats
+   information for all open internet sockets of type FAMILY on the
+   system into BUFFER.  If TCP is set, only TCP sockets are processed,
+   otherwise only UDP sockets are processed.  */
+
+static void
+print_sockets (unsigned short family, int tcp, struct buffer *buffer)
+{
+  const char *proc_file;
+  FILE *fp;
+
+  if (family == AF_INET)
+    proc_file = tcp ? "/proc/net/tcp" : "/proc/net/udp";
+  else if (family == AF_INET6)
+    proc_file = tcp ? "/proc/net/tcp6" : "/proc/net/udp6";
+  else
+    return;
+
+  fp = gdb_fopen_cloexec (proc_file, "r");
+  if (fp)
+    {
+      char buf[8192];
+
+      do
+	{
+	  if (fgets (buf, sizeof (buf), fp))
+	    {
+	      uid_t uid;
+	      unsigned int local_port, remote_port, state;
+	      char local_address[NI_MAXHOST], remote_address[NI_MAXHOST];
+	      int result;
+
+#if NI_MAXHOST <= 32
+#error "local_address and remote_address buffers too small"
+#endif
+
+	      result = sscanf (buf,
+			       "%*d: %32[0-9A-F]:%X %32[0-9A-F]:%X %X %*X:%*X %*X:%*X %*X %d %*d %*u %*s\n",
+			       local_address, &local_port,
+			       remote_address, &remote_port,
+			       &state,
+			       &uid);
+	      
+	      if (result == 6)
+		{
+		  union socket_addr locaddr, remaddr;
+		  size_t addr_size;
+		  char user[UT_NAMESIZE];
+		  char local_service[NI_MAXSERV], remote_service[NI_MAXSERV];
+
+		  if (family == AF_INET)
+		    {
+		      sscanf (local_address, "%X",
+			      &locaddr.sin.sin_addr.s_addr);
+		      sscanf (remote_address, "%X",
+			      &remaddr.sin.sin_addr.s_addr);
+		      
+		      locaddr.sin.sin_port = htons (local_port);
+		      remaddr.sin.sin_port = htons (remote_port);
+
+		      addr_size = sizeof (struct sockaddr_in);
+		    }
+		  else
+		    {
+		      sscanf (local_address, "%8X%8X%8X%8X",
+			      locaddr.sin6.sin6_addr.s6_addr32,
+			      locaddr.sin6.sin6_addr.s6_addr32 + 1,
+			      locaddr.sin6.sin6_addr.s6_addr32 + 2,
+			      locaddr.sin6.sin6_addr.s6_addr32 + 3);
+		      sscanf (remote_address, "%8X%8X%8X%8X",
+			      remaddr.sin6.sin6_addr.s6_addr32,
+			      remaddr.sin6.sin6_addr.s6_addr32 + 1,
+			      remaddr.sin6.sin6_addr.s6_addr32 + 2,
+			      remaddr.sin6.sin6_addr.s6_addr32 + 3);
+
+		      locaddr.sin6.sin6_port = htons (local_port);
+		      remaddr.sin6.sin6_port = htons (remote_port);
+		      
+		      locaddr.sin6.sin6_flowinfo = 0;
+		      remaddr.sin6.sin6_flowinfo = 0;
+		      locaddr.sin6.sin6_scope_id = 0;
+		      remaddr.sin6.sin6_scope_id = 0;
+
+		      addr_size = sizeof (struct sockaddr_in6);
+		    }
+	      
+		  locaddr.sa.sa_family = remaddr.sa.sa_family = family;
+		      
+		  result = getnameinfo (&locaddr.sa, addr_size,
+					local_address, sizeof (local_address),
+					local_service, sizeof (local_service),
+					NI_NUMERICHOST | NI_NUMERICSERV
+					| (tcp ? 0 : NI_DGRAM));
+		  if (result)
+		    continue;
+		  
+		  result = getnameinfo (&remaddr.sa, addr_size,
+					remote_address,
+					sizeof (remote_address),
+					remote_service,
+					sizeof (remote_service),
+					NI_NUMERICHOST | NI_NUMERICSERV
+					| (tcp ? 0 : NI_DGRAM));
+		  if (result)
+		    continue;
+		  
+		  user_from_uid (user, sizeof (user), uid);
+		  
+		  buffer_xml_printf (
+		      buffer,
+		      "<item>"
+		      "<column name=\"local address\">%s</column>"
+		      "<column name=\"local port\">%s</column>"
+		      "<column name=\"remote address\">%s</column>"
+		      "<column name=\"remote port\">%s</column>"
+		      "<column name=\"state\">%s</column>"
+		      "<column name=\"user\">%s</column>"
+		      "<column name=\"family\">%s</column>" 
+		      "<column name=\"protocol\">%s</column>"
+		      "</item>",
+		      local_address,
+		      local_service,
+		      remote_address,
+		      remote_service,
+		      format_socket_state (state),
+		      user,
+		      (family == AF_INET) ? "INET" : "INET6",
+		      tcp ? "STREAM" : "DGRAM");
+		}
+	    }
+	}
+      while (!feof (fp));
+
+      fclose (fp);
+    }
+}
+
+/* Collect data about internet sockets and write it into READBUF.  */
+
+static LONGEST
+linux_xfer_osdata_isockets (gdb_byte *readbuf,
+			    ULONGEST offset, ULONGEST len)
+{
+  static const char *buf;
+  static LONGEST len_avail = -1;
+  static struct buffer buffer;
+
+  if (offset == 0)
+    {
+      if (len_avail != -1 && len_avail != 0)
+	buffer_free (&buffer);
+      len_avail = 0;
+      buf = NULL;
+      buffer_init (&buffer);
+      buffer_grow_str (&buffer, "<osdata type=\"I sockets\">\n");
+
+      print_sockets (AF_INET, 1, &buffer);
+      print_sockets (AF_INET, 0, &buffer);
+      print_sockets (AF_INET6, 1, &buffer);
+      print_sockets (AF_INET6, 0, &buffer);
+
+      buffer_grow_str0 (&buffer, "</osdata>\n");
+      buf = buffer_finish (&buffer);
+      len_avail = strlen (buf);
+    }
+
+  if (offset >= len_avail)
+    {
+      /* Done.  Get rid of the buffer.  */
+      buffer_free (&buffer);
+      buf = NULL;
+      len_avail = 0;
+      return 0;
+    }
+
+  if (len > len_avail - offset)
+    len = len_avail - offset;
+  memcpy (readbuf, buf + offset, len);
+
+  return len;
+}
+
+/* Converts the time SECONDS into textual form and copies it into a
+   buffer TIME, with at most MAXLEN characters copied.  */
+
+static void
+time_from_time_t (char *time, int maxlen, TIME_T seconds)
+{
+  if (!seconds)
+    time[0] = '\0';
+  else
+    {
+      time_t t = (time_t) seconds;
+      
+      strncpy (time, ctime (&t), maxlen);
+      time[maxlen - 1] = '\0';
+    }
+}
+
+/* Finds the group name for the group GID and copies it into GROUP.
+   At most MAXLEN characters are copied.  */
+
+static void
+group_from_gid (char *group, int maxlen, gid_t gid)
+{
+  struct group *grentry = getgrgid (gid);
+  
+  if (grentry)
+    {
+      strncpy (group, grentry->gr_name, maxlen);
+      /* Ensure that the group name is null-terminated.  */
+      group[maxlen - 1] = '\0';
+    }
+  else
+    group[0] = '\0';
+}
+
+/* Collect data about shared memory recorded in /proc and write it
+   into READBUF.  */
+
+static LONGEST
+linux_xfer_osdata_shm (gdb_byte *readbuf,
+		       ULONGEST offset, ULONGEST len)
+{
+  static const char *buf;
+  static LONGEST len_avail = -1;
+  static struct buffer buffer;
+
+  if (offset == 0)
+    {
+      FILE *fp;
+
+      if (len_avail != -1 && len_avail != 0)
+	buffer_free (&buffer);
+      len_avail = 0;
+      buf = NULL;
+      buffer_init (&buffer);
+      buffer_grow_str (&buffer, "<osdata type=\"shared memory\">\n");
+
+      fp = gdb_fopen_cloexec ("/proc/sysvipc/shm", "r");
+      if (fp)
+	{
+	  char buf[8192];
+
+	  do
+	    {
+	      if (fgets (buf, sizeof (buf), fp))
+		{
+		  key_t key;
+		  uid_t uid, cuid;
+		  gid_t gid, cgid;
+		  PID_T cpid, lpid;
+		  int shmid, size, nattch;
+		  TIME_T atime, dtime, ctime;
+		  unsigned int perms;
+		  int items_read;
+				  
+		  items_read = sscanf (buf,
+				       "%d %d %o %d %lld %lld %d %u %u %u %u %lld %lld %lld",
+				       &key, &shmid, &perms, &size,
+				       &cpid, &lpid,
+				       &nattch,
+				       &uid, &gid, &cuid, &cgid,
+				       &atime, &dtime, &ctime);
+
+		  if (items_read == 14)
+		    {
+		      char user[UT_NAMESIZE], group[UT_NAMESIZE];
+		      char cuser[UT_NAMESIZE], cgroup[UT_NAMESIZE];
+		      char ccmd[32], lcmd[32];
+		      char atime_str[32], dtime_str[32], ctime_str[32];
+		      
+		      user_from_uid (user, sizeof (user), uid);
+		      group_from_gid (group, sizeof (group), gid);
+		      user_from_uid (cuser, sizeof (cuser), cuid);
+		      group_from_gid (cgroup, sizeof (cgroup), cgid);
+		      
+		      command_from_pid (ccmd, sizeof (ccmd), cpid);
+		      command_from_pid (lcmd, sizeof (lcmd), lpid);
+		      
+		      time_from_time_t (atime_str, sizeof (atime_str), atime);
+		      time_from_time_t (dtime_str, sizeof (dtime_str), dtime);
+		      time_from_time_t (ctime_str, sizeof (ctime_str), ctime);
+		      
+		      buffer_xml_printf (
+		          &buffer,
+			  "<item>"
+			  "<column name=\"key\">%d</column>"
+			  "<column name=\"shmid\">%d</column>"
+			  "<column name=\"permissions\">%o</column>"
+			  "<column name=\"size\">%d</column>"
+			  "<column name=\"creator command\">%s</column>"
+			  "<column name=\"last op. command\">%s</column>"
+			  "<column name=\"num attached\">%d</column>"
+			  "<column name=\"user\">%s</column>"
+			  "<column name=\"group\">%s</column>"
+			  "<column name=\"creator user\">%s</column>"
+			  "<column name=\"creator group\">%s</column>"
+			  "<column name=\"last shmat() time\">%s</column>"
+			  "<column name=\"last shmdt() time\">%s</column>"
+			  "<column name=\"last shmctl() time\">%s</column>"
+			  "</item>",
+			  key,
+			  shmid,
+			  perms,
+			  size,
+			  ccmd,
+			  lcmd,
+			  nattch,
+			  user,
+			  group,
+			  cuser,
+			  cgroup,
+			  atime_str,
+			  dtime_str,
+			  ctime_str);
+		    }
+		}
+	    }
+	  while (!feof (fp));
+
+	  fclose (fp);
+	}
+      
+      buffer_grow_str0 (&buffer, "</osdata>\n");
+      buf = buffer_finish (&buffer);
+      len_avail = strlen (buf);
+    }
+
+  if (offset >= len_avail)
+    {
+      /* Done.  Get rid of the buffer.  */
+      buffer_free (&buffer);
+      buf = NULL;
+      len_avail = 0;
+      return 0;
+    }
+
+  if (len > len_avail - offset)
+    len = len_avail - offset;
+  memcpy (readbuf, buf + offset, len);
+
+  return len;
+}
+
+/* Collect data about semaphores recorded in /proc and write it
+   into READBUF.  */
+
+static LONGEST
+linux_xfer_osdata_sem (gdb_byte *readbuf,
+		       ULONGEST offset, ULONGEST len)
+{
+  static const char *buf;
+  static LONGEST len_avail = -1;
+  static struct buffer buffer;
+
+  if (offset == 0)
+    {
+      FILE *fp;
+      
+      if (len_avail != -1 && len_avail != 0)
+	buffer_free (&buffer);
+      len_avail = 0;
+      buf = NULL;
+      buffer_init (&buffer);
+      buffer_grow_str (&buffer, "<osdata type=\"semaphores\">\n");
+
+      fp = gdb_fopen_cloexec ("/proc/sysvipc/sem", "r");
+      if (fp)
+	{
+	  char buf[8192];
+	  
+	  do
+	    {
+	      if (fgets (buf, sizeof (buf), fp))
+		{
+		  key_t key;
+		  uid_t uid, cuid;
+		  gid_t gid, cgid;
+		  unsigned int perms, nsems;
+		  int semid;
+		  TIME_T otime, ctime;
+		  int items_read;
+		  
+		  items_read = sscanf (buf,
+				       "%d %d %o %u %d %d %d %d %lld %lld",
+				       &key, &semid, &perms, &nsems,
+				       &uid, &gid, &cuid, &cgid,
+				       &otime, &ctime);
+		  
+		  if (items_read == 10)
+		    {
+		      char user[UT_NAMESIZE], group[UT_NAMESIZE];
+		      char cuser[UT_NAMESIZE], cgroup[UT_NAMESIZE];
+		      char otime_str[32], ctime_str[32];
+		      
+		      user_from_uid (user, sizeof (user), uid);
+		      group_from_gid (group, sizeof (group), gid);
+		      user_from_uid (cuser, sizeof (cuser), cuid);
+		      group_from_gid (cgroup, sizeof (cgroup), cgid);
+		      
+		      time_from_time_t (otime_str, sizeof (otime_str), otime);
+		      time_from_time_t (ctime_str, sizeof (ctime_str), ctime);
+		      
+		      buffer_xml_printf (
+			  &buffer,
+			  "<item>"
+			  "<column name=\"key\">%d</column>"
+			  "<column name=\"semid\">%d</column>"
+			  "<column name=\"permissions\">%o</column>"
+			  "<column name=\"num semaphores\">%u</column>"
+			  "<column name=\"user\">%s</column>"
+			  "<column name=\"group\">%s</column>"
+			  "<column name=\"creator user\">%s</column>"
+			  "<column name=\"creator group\">%s</column>"
+			  "<column name=\"last semop() time\">%s</column>"
+			  "<column name=\"last semctl() time\">%s</column>"
+			  "</item>",
+			  key,
+			  semid,
+			  perms,
+			  nsems,
+			  user,
+			  group,
+			  cuser,
+			  cgroup,
+			  otime_str,
+			  ctime_str);
+		    }
+		}
+	    }
+	  while (!feof (fp));
+
+	  fclose (fp);
+	}
+
+      buffer_grow_str0 (&buffer, "</osdata>\n");
+      buf = buffer_finish (&buffer);
+      len_avail = strlen (buf);
+    }
+
+  if (offset >= len_avail)
+    {
+      /* Done.  Get rid of the buffer.  */
+      buffer_free (&buffer);
+      buf = NULL;
+      len_avail = 0;
+      return 0;
+    }
+
+  if (len > len_avail - offset)
+    len = len_avail - offset;
+  memcpy (readbuf, buf + offset, len);
+
+  return len;
+}
+
+/* Collect data about message queues recorded in /proc and write it
+   into READBUF.  */
+
+static LONGEST
+linux_xfer_osdata_msg (gdb_byte *readbuf,
+		       ULONGEST offset, ULONGEST len)
+{
+  static const char *buf;
+  static LONGEST len_avail = -1;
+  static struct buffer buffer;
+
+  if (offset == 0)
+    {
+      FILE *fp;
+      
+      if (len_avail != -1 && len_avail != 0)
+	buffer_free (&buffer);
+      len_avail = 0;
+      buf = NULL;
+      buffer_init (&buffer);
+      buffer_grow_str (&buffer, "<osdata type=\"message queues\">\n");
+      
+      fp = gdb_fopen_cloexec ("/proc/sysvipc/msg", "r");
+      if (fp)
+	{
+	  char buf[8192];
+	  
+	  do
+	    {
+	      if (fgets (buf, sizeof (buf), fp))
+		{
+		  key_t key;
+		  PID_T lspid, lrpid;
+		  uid_t uid, cuid;
+		  gid_t gid, cgid;
+		  unsigned int perms, cbytes, qnum;
+		  int msqid;
+		  TIME_T stime, rtime, ctime;
+		  int items_read;
+		  
+		  items_read = sscanf (buf,
+				       "%d %d %o %u %u %lld %lld %d %d %d %d %lld %lld %lld",
+				       &key, &msqid, &perms, &cbytes, &qnum,
+				       &lspid, &lrpid, &uid, &gid, &cuid, &cgid,
+				       &stime, &rtime, &ctime);
+		  
+		  if (items_read == 14)
+		    {
+		      char user[UT_NAMESIZE], group[UT_NAMESIZE];
+		      char cuser[UT_NAMESIZE], cgroup[UT_NAMESIZE];
+		      char lscmd[32], lrcmd[32];
+		      char stime_str[32], rtime_str[32], ctime_str[32];
+		      
+		      user_from_uid (user, sizeof (user), uid);
+		      group_from_gid (group, sizeof (group), gid);
+		      user_from_uid (cuser, sizeof (cuser), cuid);
+		      group_from_gid (cgroup, sizeof (cgroup), cgid);
+		      
+		      command_from_pid (lscmd, sizeof (lscmd), lspid);
+		      command_from_pid (lrcmd, sizeof (lrcmd), lrpid);
+		      
+		      time_from_time_t (stime_str, sizeof (stime_str), stime);
+		      time_from_time_t (rtime_str, sizeof (rtime_str), rtime);
+		      time_from_time_t (ctime_str, sizeof (ctime_str), ctime);
+		      
+		      buffer_xml_printf (
+			  &buffer,
+			  "<item>"
+			  "<column name=\"key\">%d</column>"
+			  "<column name=\"msqid\">%d</column>"
+			  "<column name=\"permissions\">%o</column>"
+			  "<column name=\"num used bytes\">%u</column>"
+			  "<column name=\"num messages\">%u</column>"
+			  "<column name=\"last msgsnd() command\">%s</column>"
+			  "<column name=\"last msgrcv() command\">%s</column>"
+			  "<column name=\"user\">%s</column>"
+			  "<column name=\"group\">%s</column>"
+			  "<column name=\"creator user\">%s</column>"
+			  "<column name=\"creator group\">%s</column>"
+			  "<column name=\"last msgsnd() time\">%s</column>"
+			  "<column name=\"last msgrcv() time\">%s</column>"
+			  "<column name=\"last msgctl() time\">%s</column>"
+			  "</item>",
+			  key,
+			  msqid,
+			  perms,
+			  cbytes,
+			  qnum,
+			  lscmd,
+			  lrcmd,
+			  user,
+			  group,
+			  cuser,
+			  cgroup,
+			  stime_str,
+			  rtime_str,
+			  ctime_str);
+		    }
+		}
+	    }
+	  while (!feof (fp));
+
+	  fclose (fp);
+	}
+
+      buffer_grow_str0 (&buffer, "</osdata>\n");
+      buf = buffer_finish (&buffer);
+      len_avail = strlen (buf);
+    }
+
+  if (offset >= len_avail)
+    {
+      /* Done.  Get rid of the buffer.  */
+      buffer_free (&buffer);
+      buf = NULL;
+      len_avail = 0;
+      return 0;
+    }
+
+  if (len > len_avail - offset)
+    len = len_avail - offset;
+  memcpy (readbuf, buf + offset, len);
+
+  return len;
+}
+
+/* Collect data about loaded kernel modules and write it into
+   READBUF.  */
+
+static LONGEST
+linux_xfer_osdata_modules (gdb_byte *readbuf,
+			   ULONGEST offset, ULONGEST len)
+{
+  static const char *buf;
+  static LONGEST len_avail = -1;
+  static struct buffer buffer;
+
+  if (offset == 0)
+    {
+      FILE *fp;
+
+      if (len_avail != -1 && len_avail != 0)
+	buffer_free (&buffer);
+      len_avail = 0;
+      buf = NULL;
+      buffer_init (&buffer);
+      buffer_grow_str (&buffer, "<osdata type=\"modules\">\n");
+
+      fp = gdb_fopen_cloexec ("/proc/modules", "r");
+      if (fp)
+	{
+	  char buf[8192];
+	  
+	  do
+	    {
+	      if (fgets (buf, sizeof (buf), fp))
+		{
+		  char *name, *dependencies, *status, *tmp;
+		  unsigned int size;
+		  unsigned long long address;
+		  int uses;
+
+		  name = strtok (buf, " ");
+		  if (name == NULL)
+		    continue;
+
+		  tmp = strtok (NULL, " ");
+		  if (tmp == NULL)
+		    continue;
+		  if (sscanf (tmp, "%u", &size) != 1)
+		    continue;
+
+		  tmp = strtok (NULL, " ");
+		  if (tmp == NULL)
+		    continue;
+		  if (sscanf (tmp, "%d", &uses) != 1)
+		    continue;
+
+		  dependencies = strtok (NULL, " ");
+		  if (dependencies == NULL)
+		    continue;
+
+		  status = strtok (NULL, " ");
+		  if (status == NULL)
+		    continue;
+
+		  tmp = strtok (NULL, "\n");
+		  if (tmp == NULL)
+		    continue;
+		  if (sscanf (tmp, "%llx", &address) != 1)
+		    continue;
+
+		  buffer_xml_printf (
+			&buffer,
+			"<item>"
+			"<column name=\"name\">%s</column>"
+			"<column name=\"size\">%u</column>"
+			"<column name=\"num uses\">%d</column>"
+			"<column name=\"dependencies\">%s</column>"
+			"<column name=\"status\">%s</column>"
+			"<column name=\"address\">%llx</column>"
+			"</item>",
+			name,
+			size,
+			uses,
+			dependencies,
+			status,
+			address);
+		}
+	    }
+	  while (!feof (fp));
+
+	  fclose (fp);
+	}
+
+      buffer_grow_str0 (&buffer, "</osdata>\n");
+      buf = buffer_finish (&buffer);
+      len_avail = strlen (buf);
+    }
+
+  if (offset >= len_avail)
+    {
+      /* Done.  Get rid of the buffer.  */
+      buffer_free (&buffer);
+      buf = NULL;
+      len_avail = 0;
+      return 0;
+    }
+
+  if (len > len_avail - offset)
+    len = len_avail - offset;
+  memcpy (readbuf, buf + offset, len);
+
+  return len;
+}
+
+struct osdata_type {
+  char *type;
+  char *title;
+  char *description;
+  LONGEST (*getter) (gdb_byte *readbuf, ULONGEST offset, ULONGEST len);
+} osdata_table[] = {
+  { "processes", "Processes", "Listing of all processes",
+    linux_xfer_osdata_processes },
+  { "procgroups", "Process groups", "Listing of all process groups",
+    linux_xfer_osdata_processgroups },
+  { "threads", "Threads", "Listing of all threads",
+    linux_xfer_osdata_threads },
+  { "files", "File descriptors", "Listing of all file descriptors",
+    linux_xfer_osdata_fds },
+  { "sockets", "Sockets", "Listing of all internet-domain sockets",
+    linux_xfer_osdata_isockets },
+  { "shm", "Shared-memory regions", "Listing of all shared-memory regions",
+    linux_xfer_osdata_shm },
+  { "semaphores", "Semaphores", "Listing of all semaphores",
+    linux_xfer_osdata_sem },
+  { "msg", "Message queues", "Listing of all message queues",
+    linux_xfer_osdata_msg },
+  { "modules", "Kernel modules", "Listing of all loaded kernel modules",
+    linux_xfer_osdata_modules },
+  { NULL, NULL, NULL }
+};
+
+LONGEST
+linux_common_xfer_osdata (const char *annex, gdb_byte *readbuf,
+			  ULONGEST offset, ULONGEST len)
+{
+  if (!annex || *annex == '\0')
+    {
+      static const char *buf;
+      static LONGEST len_avail = -1;
+      static struct buffer buffer;
+
+      if (offset == 0)
+	{
+	  int i;
+
+	  if (len_avail != -1 && len_avail != 0)
+	    buffer_free (&buffer);
+	  len_avail = 0;
+	  buf = NULL;
+	  buffer_init (&buffer);
+	  buffer_grow_str (&buffer, "<osdata type=\"types\">\n");
+
+	  for (i = 0; osdata_table[i].type; ++i)
+	    buffer_xml_printf (
+			       &buffer,
+			       "<item>"
+			       "<column name=\"Type\">%s</column>"
+			       "<column name=\"Description\">%s</column>"
+			       "<column name=\"Title\">%s</column>"
+			       "</item>",
+			       osdata_table[i].type,
+			       osdata_table[i].description,
+			       osdata_table[i].title);
+
+	  buffer_grow_str0 (&buffer, "</osdata>\n");
+	  buf = buffer_finish (&buffer);
+	  len_avail = strlen (buf);
+	}
+
+      if (offset >= len_avail)
+	{
+	  /* Done.  Get rid of the buffer.  */
+	  buffer_free (&buffer);
+	  buf = NULL;
+	  len_avail = 0;
+	  return 0;
+	}
+
+      if (len > len_avail - offset)
+	len = len_avail - offset;
+      memcpy (readbuf, buf + offset, len);
+
+      return len;
+    }
+  else
+    {
+      int i;
+
+      for (i = 0; osdata_table[i].type; ++i)
+	{
+	  if (strcmp (annex, osdata_table[i].type) == 0)
+	    {
+	      gdb_assert (readbuf);
+	      
+	      return (osdata_table[i].getter) (readbuf, offset, len);
+	    }
+	}
+
+      return 0;
+    }
+}
+