Reorganize implementation of Flist_system_processes and

Fsystem_process_attributes.  No functional changes.
* process.c: Don't #include pwd.h, grp.h and limits.h.
(Flist_system_processes): Just call list_system_processes.
(Fsystem_process_attributes): Just call system_process_attributes.
(procfs_list_system_processes, time_from_jiffies)
(ltime_from_jiffies, get_up_time, procfs_ttyname, MAJOR, MINOR)
(procfs_get_total_memory, procfs_system_process_attributes): Move ...

* sysdep.c: ... here.  Include pwd.h, grp.h and limits.h.
(list_system_processes): Rename from
procfs_list_system_processes.  Enclose in #ifdef HAVE_PROCFS.
Provide a do nothing implementation.
(system_process_attributes): Rename from
procfs_list_system_processes.
(ltime_from_jiffies, get_up_time, procfs_ttyname, MAJOR, MINOR)
(procfs_get_total_memory):  Enclose in #ifdef GNU_LINUX.

* w32.c (list_system_processes): Rename from
w32_list_system_processes.
(system_process_attributes): Rename from
w32_system_process_attributes.

* s/gnu-linux.h (LISTPROC, PROCATTR): Remove.

* process.h (w32_list_system_processes)
(w32_system_process_attributes): Remove.
(list_system_processes, system_process_attributes): New
prototypes.

* config.nt (LISTPROC, PROCATTR): Remove.

6 files changed, 484 insertions, 445 deletions

diff --git a/src/ChangeLog b/src/ChangeLog
index 53654f413f5..4bc6d54c1a0 100644
--- a/src/ChangeLog
+++ b/src/ChangeLog
@@ -1,3 +1,35 @@
+2008-12-19  Dan Nicolaescu  <dann@ics.uci.edu>
+
+        Reorganize implementation of Flist_system_processes and
+        Fsystem_process_attributes.  No functional changes.
+        * process.c: Don't #include pwd.h, grp.h and limits.h.
+        (Flist_system_processes): Just call list_system_processes.
+        (Fsystem_process_attributes): Just call system_process_attributes.
+        (procfs_list_system_processes, time_from_jiffies)
+        (ltime_from_jiffies, get_up_time, procfs_ttyname, MAJOR, MINOR)
+        (procfs_get_total_memory, procfs_system_process_attributes): Move ...
+
+        * sysdep.c: ... here.  Include pwd.h, grp.h and limits.h.
+        (list_system_processes): Rename from
+        procfs_list_system_processes.  Enclose in #ifdef HAVE_PROCFS.
+        Provide a do nothing implementation.
+        (system_process_attributes): Rename from
+        procfs_list_system_processes.
+        (ltime_from_jiffies, get_up_time, procfs_ttyname, MAJOR, MINOR)
+        (procfs_get_total_memory):  Enclose in #ifdef GNU_LINUX.
+
+        * w32.c (list_system_processes): Rename from
+        w32_list_system_processes.
+        (system_process_attributes): Rename from
+        w32_system_process_attributes.
+
+        * s/gnu-linux.h (LISTPROC, PROCATTR): Remove.
+
+        * process.h (w32_list_system_processes)
+        (w32_system_process_attributes): Remove.
+        (list_system_processes, system_process_attributes): New
+        prototypes.
+
 2008-12-19  Kenichi Handa  <handa@m17n.org>
 
         * xfont.c (xfont_decode_coding_xlfd): New function.
diff --git a/src/process.c b/src/process.c
index 0f3373b5db0..4172ffe1f50 100644
--- a/src/process.c
+++ b/src/process.c
@@ -33,8 +33,6 @@ along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
 #ifdef subprocesses
 
 #include <stdio.h>
-#include <stdlib.h>
-#include <ctype.h>
 #include <errno.h>
 #include <setjmp.h>
 #include <sys/types.h>          /* some typedefs are used in sys/file.h */
@@ -44,11 +42,6 @@ along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
 #include <inttypes.h>
 #endif
 
-#ifdef HAVE_PWD_H
-#include <pwd.h>
-#include <grp.h>
-#endif
-
 #ifdef HAVE_UNISTD_H
 #include <unistd.h>
 #endif
@@ -104,10 +97,6 @@ along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
 #include <resolv.h>
 #endif
 
-#ifdef HAVE_LIMITS_H
-#include <limits.h>
-#endif /* HAVE_LIMITS_H */
-
 #include "lisp.h"
 #include "systime.h"
 #include "systty.h"
@@ -7073,422 +7062,6 @@ keyboard_bit_set (mask)
 
 /* Enumeration of and access to system processes a-la ps(1).  */
 
-#if HAVE_PROCFS
-
-/* Process enumeration and access via /proc.  */
-
-static Lisp_Object
-procfs_list_system_processes ()
-{
-  Lisp_Object procdir, match, proclist, next;
-  struct gcpro gcpro1, gcpro2;
-  register Lisp_Object tail;
-
-  GCPRO2 (procdir, match);
-  /* For every process on the system, there's a directory in the
-     "/proc" pseudo-directory whose name is the numeric ID of that
-     process.  */
-  procdir = build_string ("/proc");
-  match = build_string ("[0-9]+");
-  proclist = directory_files_internal (procdir, Qnil, match, Qt, 0, Qnil);
-
-  /* `proclist' gives process IDs as strings.  Destructively convert
-     each string into a number.  */
-  for (tail = proclist; CONSP (tail); tail = next)
-    {
-      next = XCDR (tail);
-      XSETCAR (tail, Fstring_to_number (XCAR (tail), Qnil));
-    }
-  UNGCPRO;
-
-  /* directory_files_internal returns the files in reverse order; undo
-     that.  */
-  proclist = Fnreverse (proclist);
-  return proclist;
-}
-
-static void
-time_from_jiffies (unsigned long long tval, long hz,
-                   time_t *sec, unsigned *usec)
-{
-  unsigned long long ullsec;
-
-  *sec = tval / hz;
-  ullsec = *sec;
-  tval -= ullsec * hz;
-  /* Careful: if HZ > 1 million, then integer division by it yields zero.  */
-  if (hz <= 1000000)
-    *usec = tval * 1000000 / hz;
-  else
-    *usec = tval / (hz / 1000000);
-}
-
-static Lisp_Object
-ltime_from_jiffies (unsigned long long tval, long hz)
-{
-  time_t sec;
-  unsigned usec;
-
-  time_from_jiffies (tval, hz, &sec, &usec);
-
-  return list3 (make_number ((sec >> 16) & 0xffff),
-                make_number (sec & 0xffff),
-                make_number (usec));
-}
-
-static void
-get_up_time (time_t *sec, unsigned *usec)
-{
-  FILE *fup;
-
-  *sec = *usec = 0;
-
-  BLOCK_INPUT;
-  fup = fopen ("/proc/uptime", "r");
-
-  if (fup)
-    {
-      double uptime, idletime;
-
-      /* The numbers in /proc/uptime use C-locale decimal point, but
-         we already set ourselves to the C locale (see `fixup_locale'
-         in emacs.c).  */
-      if (2 <= fscanf (fup, "%lf %lf", &uptime, &idletime))
-        {
-          *sec = uptime;
-          *usec = (uptime - *sec) * 1000000;
-        }
-      fclose (fup);
-    }
-  UNBLOCK_INPUT;
-}
-
-#define MAJOR(d) (((unsigned)(d) >> 8) & 0xfff)
-#define MINOR(d) (((unsigned)(d) & 0xff) | (((unsigned)(d) & 0xfff00000) >> 12))
-
-static Lisp_Object
-procfs_ttyname (rdev)
-{
-  FILE *fdev = NULL;
-  char name[PATH_MAX];
-
-  BLOCK_INPUT;
-  fdev = fopen ("/proc/tty/drivers", "r");
-
-  if (fdev)
-    {
-      unsigned major;
-      unsigned long minor_beg, minor_end;
-      char minor[25];   /* 2 32-bit numbers + dash */
-      char *endp;
-
-      while (!feof (fdev) && !ferror (fdev))
-        {
-          if (3 <= fscanf (fdev, "%*s %s %u %s %*s\n", name, &major, minor)
-              && major == MAJOR (rdev))
-            {
-              minor_beg = strtoul (minor, &endp, 0);
-              if (*endp == '\0')
-                minor_end = minor_beg;
-              else if (*endp == '-')
-                minor_end = strtoul (endp + 1, &endp, 0);
-              else
-                continue;
-
-              if (MINOR (rdev) >= minor_beg && MINOR (rdev) <= minor_end)
-                {
-                  sprintf (name + strlen (name), "%lu", MINOR (rdev));
-                  break;
-                }
-            }
-        }
-      fclose (fdev);
-    }
-  UNBLOCK_INPUT;
-  return build_string (name);
-}
-
-static unsigned long
-procfs_get_total_memory (void)
-{
-  FILE *fmem = NULL;
-  unsigned long retval = 2 * 1024 * 1024; /* default: 2GB */
-
-  BLOCK_INPUT;
-  fmem = fopen ("/proc/meminfo", "r");
-
-  if (fmem)
-    {
-      unsigned long entry_value;
-      char entry_name[20];      /* the longest I saw is 13+1 */
-
-      while (!feof (fmem) && !ferror (fmem))
-        {
-          if (2 <= fscanf (fmem, "%s %lu kB\n", entry_name, &entry_value)
-              && strcmp (entry_name, "MemTotal:") == 0)
-            {
-              retval = entry_value;
-              break;
-            }
-        }
-      fclose (fmem);
-    }
-  UNBLOCK_INPUT;
-  return retval;
-}
-
-static Lisp_Object
-procfs_system_process_attributes (pid)
-     Lisp_Object pid;
-{
-  char procfn[PATH_MAX], fn[PATH_MAX];
-  struct stat st;
-  struct passwd *pw;
-  struct group *gr;
-  long clocks_per_sec;
-  char *procfn_end;
-  char procbuf[1025], *p, *q;
-  int fd;
-  ssize_t nread;
-  const char *cmd = NULL;
-  char *cmdline = NULL;
-  size_t cmdsize = 0, cmdline_size;
-  unsigned char c;
-  int proc_id, ppid, uid, gid, pgrp, sess, tty, tpgid, thcount;
-  unsigned long long utime, stime, cutime, cstime, start;
-  long priority, nice, rss;
-  unsigned long minflt, majflt, cminflt, cmajflt, vsize;
-  time_t sec;
-  unsigned usec;
-  EMACS_TIME tnow, tstart, tboot, telapsed,ttotal;
-  double pcpu, pmem;
-  Lisp_Object attrs = Qnil;
-  Lisp_Object cmd_str, decoded_cmd, tem;
-  struct gcpro gcpro1, gcpro2;
-  EMACS_INT uid_eint, gid_eint;
-
-  CHECK_NUMBER_OR_FLOAT (pid);
-  proc_id = FLOATP (pid) ? XFLOAT_DATA (pid) : XINT (pid);
-  sprintf (procfn, "/proc/%lu", proc_id);
-  if (stat (procfn, &st) < 0)
-    return attrs;
-
-  GCPRO2 (attrs, decoded_cmd);
-
-  /* euid egid */
-  uid = st.st_uid;
-  /* Use of EMACS_INT stops GCC whining about limited range of data type.  */
-  uid_eint = uid;
-  attrs = Fcons (Fcons (Qeuid, make_fixnum_or_float (uid_eint)), attrs);
-  BLOCK_INPUT;
-  pw = getpwuid (uid);
-  UNBLOCK_INPUT;
-  if (pw)
-    attrs = Fcons (Fcons (Quser, build_string (pw->pw_name)), attrs);
-
-  gid = st.st_gid;
-  gid_eint = gid;
-  attrs = Fcons (Fcons (Qegid, make_fixnum_or_float (gid_eint)), attrs);
-  BLOCK_INPUT;
-  gr = getgrgid (gid);
-  UNBLOCK_INPUT;
-  if (gr)
-    attrs = Fcons (Fcons (Qgroup, build_string (gr->gr_name)), attrs);
-
-  strcpy (fn, procfn);
-  procfn_end = fn + strlen (fn);
-  strcpy (procfn_end, "/stat");
-  fd = emacs_open (fn, O_RDONLY, 0);
-  if (fd >= 0 && (nread = emacs_read (fd, procbuf, sizeof(procbuf) - 1)) > 0)
-    {
-      procbuf[nread] = '\0';
-      p = procbuf;
-
-      p = strchr (p, '(');
-      if (p != NULL)
-        {
-          q = strrchr (p + 1, ')');
-          /* comm */
-          if (q != NULL)
-            {
-              cmd = p + 1;
-              cmdsize = q - cmd;
-            }
-        }
-      else
-        q = NULL;
-      if (cmd == NULL)
-        {
-          cmd = "???";
-          cmdsize = 3;
-        }
-      /* Command name is encoded in locale-coding-system; decode it.  */
-      cmd_str = make_unibyte_string (cmd, cmdsize);
-      decoded_cmd = code_convert_string_norecord (cmd_str,
-                                                  Vlocale_coding_system, 0);
-      attrs = Fcons (Fcons (Qcomm, decoded_cmd), attrs);
-
-      if (q)
-        {
-          EMACS_INT ppid_eint, pgrp_eint, sess_eint, tpgid_eint, thcount_eint;
-          p = q + 2;
-          /* state ppid pgrp sess tty tpgid . minflt cminflt majflt cmajflt utime stime cutime cstime priority nice thcount . start vsize rss */
-          sscanf (p, "%c %d %d %d %d %d %*u %lu %lu %lu %lu %Lu %Lu %Lu %Lu %ld %ld %d %*d %Lu %lu %ld",
-                  &c, &ppid, &pgrp, &sess, &tty, &tpgid,
-                  &minflt, &cminflt, &majflt, &cmajflt,
-                  &utime, &stime, &cutime, &cstime,
-                  &priority, &nice, &thcount, &start, &vsize, &rss);
-          {
-            char state_str[2];
-
-            state_str[0] = c;
-            state_str[1] = '\0';
-            tem =  build_string (state_str);
-            attrs = Fcons (Fcons (Qstate, tem), attrs);
-          }
-          /* Stops GCC whining about limited range of data type.  */
-          ppid_eint = ppid;
-          pgrp_eint = pgrp;
-          sess_eint = sess;
-          tpgid_eint = tpgid;
-          thcount_eint = thcount;
-          attrs = Fcons (Fcons (Qppid, make_fixnum_or_float (ppid_eint)), attrs);
-          attrs = Fcons (Fcons (Qpgrp, make_fixnum_or_float (pgrp_eint)), attrs);
-          attrs = Fcons (Fcons (Qsess, make_fixnum_or_float (sess_eint)), attrs);
-          attrs = Fcons (Fcons (Qttname, procfs_ttyname (tty)), attrs);
-          attrs = Fcons (Fcons (Qtpgid, make_fixnum_or_float (tpgid_eint)), attrs);
-          attrs = Fcons (Fcons (Qminflt, make_fixnum_or_float (minflt)), attrs);
-          attrs = Fcons (Fcons (Qmajflt, make_fixnum_or_float (majflt)), attrs);
-          attrs = Fcons (Fcons (Qcminflt, make_fixnum_or_float (cminflt)), attrs);
-          attrs = Fcons (Fcons (Qcmajflt, make_fixnum_or_float (cmajflt)), attrs);
-          clocks_per_sec = sysconf (_SC_CLK_TCK);
-          if (clocks_per_sec < 0)
-            clocks_per_sec = 100;
-          attrs = Fcons (Fcons (Qutime,
-                                ltime_from_jiffies (utime, clocks_per_sec)),
-                         attrs);
-          attrs = Fcons (Fcons (Qstime,
-                                ltime_from_jiffies (stime, clocks_per_sec)),
-                         attrs);
-          attrs = Fcons (Fcons (Qcutime,
-                                ltime_from_jiffies (cutime, clocks_per_sec)),
-                         attrs);
-          attrs = Fcons (Fcons (Qcstime,
-                                ltime_from_jiffies (cstime, clocks_per_sec)),
-                         attrs);
-          attrs = Fcons (Fcons (Qpri, make_number (priority)), attrs);
-          attrs = Fcons (Fcons (Qnice, make_number (nice)), attrs);
-          attrs = Fcons (Fcons (Qthcount, make_fixnum_or_float (thcount_eint)), attrs);
-          EMACS_GET_TIME (tnow);
-          get_up_time (&sec, &usec);
-          EMACS_SET_SECS (telapsed, sec);
-          EMACS_SET_USECS (telapsed, usec);
-          EMACS_SUB_TIME (tboot, tnow, telapsed);
-          time_from_jiffies (start, clocks_per_sec, &sec, &usec);
-          EMACS_SET_SECS (tstart, sec);
-          EMACS_SET_USECS (tstart, usec);
-          EMACS_ADD_TIME (tstart, tboot, tstart);
-          attrs = Fcons (Fcons (Qstart,
-                                list3 (make_number
-                                       ((EMACS_SECS (tstart) >> 16) & 0xffff),
-                                       make_number
-                                       (EMACS_SECS (tstart) & 0xffff),
-                                       make_number
-                                       (EMACS_USECS (tstart)))),
-                         attrs);
-          attrs = Fcons (Fcons (Qvsize, make_fixnum_or_float (vsize/1024)), attrs);
-          attrs = Fcons (Fcons (Qrss, make_fixnum_or_float (4*rss)), attrs);
-          EMACS_SUB_TIME (telapsed, tnow, tstart);
-          attrs = Fcons (Fcons (Qetime,
-                                list3 (make_number
-                                       ((EMACS_SECS (telapsed) >> 16) & 0xffff),
-                                       make_number
-                                       (EMACS_SECS (telapsed) & 0xffff),
-                                       make_number
-                                       (EMACS_USECS (telapsed)))),
-                         attrs);
-          time_from_jiffies (utime + stime, clocks_per_sec, &sec, &usec);
-          pcpu = (sec + usec / 1000000.0) / (EMACS_SECS (telapsed) + EMACS_USECS (telapsed) / 1000000.0);
-          if (pcpu > 1.0)
-            pcpu = 1.0;
-          attrs = Fcons (Fcons (Qpcpu, make_float (100 * pcpu)), attrs);
-          pmem = 4.0 * 100 * rss / procfs_get_total_memory ();
-          if (pmem > 100)
-            pmem = 100;
-          attrs = Fcons (Fcons (Qpmem, make_float (pmem)), attrs);
-        }
-    }
-  if (fd >= 0)
-    emacs_close (fd);
-
-  /* args */
-  strcpy (procfn_end, "/cmdline");
-  fd = emacs_open (fn, O_RDONLY, 0);
-  if (fd >= 0)
-    {
-      for (cmdline_size = 0; emacs_read (fd, &c, 1) == 1; cmdline_size++)
-        {
-          if (isspace (c) || c == '\\')
-            cmdline_size++;     /* for later quoting, see below */
-        }
-      if (cmdline_size)
-        {
-          cmdline = xmalloc (cmdline_size + 1);
-          lseek (fd, 0L, SEEK_SET);
-          cmdline[0] = '\0';
-          if ((nread = read (fd, cmdline, cmdline_size)) >= 0)
-            cmdline[nread++] = '\0';
-          else
-            {
-              /* Assigning zero to `nread' makes us skip the following
-                 two loops, assign zero to cmdline_size, and enter the
-                 following `if' clause that handles unknown command
-                 lines.  */
-              nread = 0;
-            }
-          /* We don't want trailing null characters.  */
-          for (p = cmdline + nread - 1; p > cmdline && !*p; p--)
-            nread--;
-          for (p = cmdline; p < cmdline + nread; p++)
-            {
-              /* Escape-quote whitespace and backslashes.  */
-              if (isspace (*p) || *p == '\\')
-                {
-                  memmove (p + 1, p, nread - (p - cmdline));
-                  nread++;
-                  *p++ = '\\';
-                }
-              else if (*p == '\0')
-                *p = ' ';
-            }
-          cmdline_size = nread;
-        }
-      if (!cmdline_size)
-        {
-          if (!cmd)
-            cmd = "???";
-          if (!cmdsize)
-            cmdsize = strlen (cmd);
-          cmdline_size = cmdsize + 2;
-          cmdline = xmalloc (cmdline_size + 1);
-          strcpy (cmdline, "[");
-          strcat (strncat (cmdline, cmd, cmdsize), "]");
-        }
-      emacs_close (fd);
-      /* Command line is encoded in locale-coding-system; decode it.  */
-      cmd_str = make_unibyte_string (cmdline, cmdline_size);
-      decoded_cmd = code_convert_string_norecord (cmd_str,
-                                                  Vlocale_coding_system, 0);
-      xfree (cmdline);
-      attrs = Fcons (Fcons (Qargs, decoded_cmd), attrs);
-    }
-
-  UNGCPRO;
-  return attrs;
-}
-
-#endif  /* !HAVE_PROCFS */
-
 DEFUN ("list-system-processes", Flist_system_processes, Slist_system_processes,
        0, 0, 0,
        doc: /* Return a list of numerical process IDs of all running processes.
@@ -7498,11 +7071,7 @@ See `system-process-attributes' for getting attributes of a process
 given its ID.  */)
     ()
 {
-#ifdef LISTPROC
-  return LISTPROC ();
-#else
-  return Qnil;
-#endif
+  return list_system_processes ();
 }
 
 DEFUN ("system-process-attributes", Fsystem_process_attributes,
@@ -7558,11 +7127,7 @@ integer or floating point values.
 
     Lisp_Object pid;
 {
-#ifdef PROCATTR
-  return PROCATTR (pid);
-#else
-  return Qnil;
-#endif
+  return system_process_attributes (pid);
 }
 
 void
diff --git a/src/process.h b/src/process.h
index 9606f5da9d6..73674b7358e 100644
--- a/src/process.h
+++ b/src/process.h
@@ -161,13 +161,13 @@ extern int synch_process_retcode;
    when exiting.  */
 extern int inhibit_sentinels;
 
-extern Lisp_Object w32_list_system_processes P_ ((void));
-extern Lisp_Object w32_system_process_attributes P_ ((Lisp_Object));
-
 extern Lisp_Object Qeuid, Qegid, Qcomm, Qstate, Qppid, Qpgrp, Qsess, Qttname;
 extern Lisp_Object Qminflt, Qmajflt, Qcminflt, Qcmajflt, Qutime, Qstime;
 extern Lisp_Object Qcutime, Qpri, Qnice, Qthcount, Qstart, Qvsize, Qrss, Qargs;
 extern Lisp_Object Quser, Qgroup, Qetime, Qpcpu, Qpmem, Qtpgid, Qcstime;
 
+extern Lisp_Object list_system_processes (void);
+extern Lisp_Object system_process_attributes (Lisp_Object);
+
 /* arch-tag: dffedfc4-d7bc-4b58-a26f-c16155449c72
    (do not change this comment) */
diff --git a/src/s/gnu-linux.h b/src/s/gnu-linux.h
index 2e28b81f7d0..7437db5d8eb 100644
--- a/src/s/gnu-linux.h
+++ b/src/s/gnu-linux.h
@@ -105,10 +105,8 @@ along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
 
 #define BSTRING
 
-/* These are used in Flist_system_processes and Fsystem_process_attributes.  */
+/* This is used in list_system_processes.  */
 #define HAVE_PROCFS 1
-#define LISTPROC procfs_list_system_processes
-#define PROCATTR procfs_system_process_attributes
 
 /* define MAIL_USE_FLOCK if the mailer uses flock
    to interlock access to /usr/spool/mail/$USER.
diff --git a/src/sysdep.c b/src/sysdep.c
index 0a2e2ed1614..7f53ea2f788 100644
--- a/src/sysdep.c
+++ b/src/sysdep.c
@@ -25,6 +25,13 @@ along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
 #include <signal.h>
 #include <stdio.h>
 #include <setjmp.h>
+#ifdef HAVE_PWD_H
+#include <pwd.h>
+#include <grp.h>
+#endif /* HAVE_PWD_H */
+#ifdef HAVE_LIMITS_H
+#include <limits.h>
+#endif /* HAVE_LIMITS_H */
 #ifdef HAVE_UNISTD_H
 #include <unistd.h>
 #endif
@@ -3171,6 +3178,443 @@ serial_configure (struct Lisp_Process *p,
 
 }
 #endif /* TERMIOS  */
+
+/* System depended enumeration of and access to system processes a-la ps(1).  */
+
+#ifdef HAVE_PROCFS
+
+/* Process enumeration and access via /proc.  */
+
+Lisp_Object
+list_system_processes ()
+{
+  Lisp_Object procdir, match, proclist, next;
+  struct gcpro gcpro1, gcpro2;
+  register Lisp_Object tail;
+
+  GCPRO2 (procdir, match);
+  /* For every process on the system, there's a directory in the
+     "/proc" pseudo-directory whose name is the numeric ID of that
+     process.  */
+  procdir = build_string ("/proc");
+  match = build_string ("[0-9]+");
+  proclist = directory_files_internal (procdir, Qnil, match, Qt, 0, Qnil);
+
+  /* `proclist' gives process IDs as strings.  Destructively convert
+     each string into a number.  */
+  for (tail = proclist; CONSP (tail); tail = next)
+    {
+      next = XCDR (tail);
+      XSETCAR (tail, Fstring_to_number (XCAR (tail), Qnil));
+    }
+  UNGCPRO;
+
+  /* directory_files_internal returns the files in reverse order; undo
+     that.  */
+  proclist = Fnreverse (proclist);
+  return proclist;
+}
+
+#elif !defined (WINDOWSNT)
+
+Lisp_Object
+list_system_processes ()
+{
+  return Qnil;
+}
+#endif /* !defined (WINDOWSNT)*/
+
+#ifdef GNU_LINUX
+static void
+time_from_jiffies (unsigned long long tval, long hz,
+                   time_t *sec, unsigned *usec)
+{
+  unsigned long long ullsec;
+
+  *sec = tval / hz;
+  ullsec = *sec;
+  tval -= ullsec * hz;
+  /* Careful: if HZ > 1 million, then integer division by it yields zero.  */
+  if (hz <= 1000000)
+    *usec = tval * 1000000 / hz;
+  else
+    *usec = tval / (hz / 1000000);
+}
+
+static Lisp_Object
+ltime_from_jiffies (unsigned long long tval, long hz)
+{
+  time_t sec;
+  unsigned usec;
+
+  time_from_jiffies (tval, hz, &sec, &usec);
+
+  return list3 (make_number ((sec >> 16) & 0xffff),
+                make_number (sec & 0xffff),
+                make_number (usec));
+}
+
+static void
+get_up_time (time_t *sec, unsigned *usec)
+{
+  FILE *fup;
+
+  *sec = *usec = 0;
+
+  BLOCK_INPUT;
+  fup = fopen ("/proc/uptime", "r");
+
+  if (fup)
+    {
+      double uptime, idletime;
+
+      /* The numbers in /proc/uptime use C-locale decimal point, but
+         we already set ourselves to the C locale (see `fixup_locale'
+         in emacs.c).  */
+      if (2 <= fscanf (fup, "%lf %lf", &uptime, &idletime))
+        {
+          *sec = uptime;
+          *usec = (uptime - *sec) * 1000000;
+        }
+      fclose (fup);
+    }
+  UNBLOCK_INPUT;
+}
+
+#define MAJOR(d) (((unsigned)(d) >> 8) & 0xfff)
+#define MINOR(d) (((unsigned)(d) & 0xff) | (((unsigned)(d) & 0xfff00000) >> 12))
+
+static Lisp_Object
+procfs_ttyname (rdev)
+{
+  FILE *fdev = NULL;
+  char name[PATH_MAX];
+
+  BLOCK_INPUT;
+  fdev = fopen ("/proc/tty/drivers", "r");
+
+  if (fdev)
+    {
+      unsigned major;
+      unsigned long minor_beg, minor_end;
+      char minor[25];   /* 2 32-bit numbers + dash */
+      char *endp;
+
+      while (!feof (fdev) && !ferror (fdev))
+        {
+          if (3 <= fscanf (fdev, "%*s %s %u %s %*s\n", name, &major, minor)
+              && major == MAJOR (rdev))
+            {
+              minor_beg = strtoul (minor, &endp, 0);
+              if (*endp == '\0')
+                minor_end = minor_beg;
+              else if (*endp == '-')
+                minor_end = strtoul (endp + 1, &endp, 0);
+              else
+                continue;
+
+              if (MINOR (rdev) >= minor_beg && MINOR (rdev) <= minor_end)
+                {
+                  sprintf (name + strlen (name), "%lu", MINOR (rdev));
+                  break;
+                }
+            }
+        }
+      fclose (fdev);
+    }
+  UNBLOCK_INPUT;
+  return build_string (name);
+}
+
+static unsigned long
+procfs_get_total_memory (void)
+{
+  FILE *fmem = NULL;
+  unsigned long retval = 2 * 1024 * 1024; /* default: 2GB */
+
+  BLOCK_INPUT;
+  fmem = fopen ("/proc/meminfo", "r");
+
+  if (fmem)
+    {
+      unsigned long entry_value;
+      char entry_name[20];      /* the longest I saw is 13+1 */
+
+      while (!feof (fmem) && !ferror (fmem))
+        {
+          if (2 <= fscanf (fmem, "%s %lu kB\n", entry_name, &entry_value)
+              && strcmp (entry_name, "MemTotal:") == 0)
+            {
+              retval = entry_value;
+              break;
+            }
+        }
+      fclose (fmem);
+    }
+  UNBLOCK_INPUT;
+  return retval;
+}
+
+Lisp_Object
+system_process_attributes (pid)
+     Lisp_Object pid;
+{
+  char procfn[PATH_MAX], fn[PATH_MAX];
+  struct stat st;
+  struct passwd *pw;
+  struct group *gr;
+  long clocks_per_sec;
+  char *procfn_end;
+  char procbuf[1025], *p, *q;
+  int fd;
+  ssize_t nread;
+  const char *cmd = NULL;
+  char *cmdline = NULL;
+  size_t cmdsize = 0, cmdline_size;
+  unsigned char c;
+  int proc_id, ppid, uid, gid, pgrp, sess, tty, tpgid, thcount;
+  unsigned long long utime, stime, cutime, cstime, start;
+  long priority, nice, rss;
+  unsigned long minflt, majflt, cminflt, cmajflt, vsize;
+  time_t sec;
+  unsigned usec;
+  EMACS_TIME tnow, tstart, tboot, telapsed,ttotal;
+  double pcpu, pmem;
+  Lisp_Object attrs = Qnil;
+  Lisp_Object cmd_str, decoded_cmd, tem;
+  struct gcpro gcpro1, gcpro2;
+  EMACS_INT uid_eint, gid_eint;
+
+  CHECK_NUMBER_OR_FLOAT (pid);
+  proc_id = FLOATP (pid) ? XFLOAT_DATA (pid) : XINT (pid);
+  sprintf (procfn, "/proc/%lu", proc_id);
+  if (stat (procfn, &st) < 0)
+    return attrs;
+
+  GCPRO2 (attrs, decoded_cmd);
+
+  /* euid egid */
+  uid = st.st_uid;
+  /* Use of EMACS_INT stops GCC whining about limited range of data type.  */
+  uid_eint = uid;
+  attrs = Fcons (Fcons (Qeuid, make_fixnum_or_float (uid_eint)), attrs);
+  BLOCK_INPUT;
+  pw = getpwuid (uid);
+  UNBLOCK_INPUT;
+  if (pw)
+    attrs = Fcons (Fcons (Quser, build_string (pw->pw_name)), attrs);
+
+  gid = st.st_gid;
+  gid_eint = gid;
+  attrs = Fcons (Fcons (Qegid, make_fixnum_or_float (gid_eint)), attrs);
+  BLOCK_INPUT;
+  gr = getgrgid (gid);
+  UNBLOCK_INPUT;
+  if (gr)
+    attrs = Fcons (Fcons (Qgroup, build_string (gr->gr_name)), attrs);
+
+  strcpy (fn, procfn);
+  procfn_end = fn + strlen (fn);
+  strcpy (procfn_end, "/stat");
+  fd = emacs_open (fn, O_RDONLY, 0);
+  if (fd >= 0 && (nread = emacs_read (fd, procbuf, sizeof(procbuf) - 1)) > 0)
+    {
+      procbuf[nread] = '\0';
+      p = procbuf;
+
+      p = strchr (p, '(');
+      if (p != NULL)
+        {
+          q = strrchr (p + 1, ')');
+          /* comm */
+          if (q != NULL)
+            {
+              cmd = p + 1;
+              cmdsize = q - cmd;
+            }
+        }
+      else
+        q = NULL;
+      if (cmd == NULL)
+        {
+          cmd = "???";
+          cmdsize = 3;
+        }
+      /* Command name is encoded in locale-coding-system; decode it.  */
+      cmd_str = make_unibyte_string (cmd, cmdsize);
+      decoded_cmd = code_convert_string_norecord (cmd_str,
+                                                  Vlocale_coding_system, 0);
+      attrs = Fcons (Fcons (Qcomm, decoded_cmd), attrs);
+
+      if (q)
+        {
+          EMACS_INT ppid_eint, pgrp_eint, sess_eint, tpgid_eint, thcount_eint;
+          p = q + 2;
+          /* state ppid pgrp sess tty tpgid . minflt cminflt majflt cmajflt utime stime cutime cstime priority nice thcount . start vsize rss */
+          sscanf (p, "%c %d %d %d %d %d %*u %lu %lu %lu %lu %Lu %Lu %Lu %Lu %ld %ld %d %*d %Lu %lu %ld",
+                  &c, &ppid, &pgrp, &sess, &tty, &tpgid,
+                  &minflt, &cminflt, &majflt, &cmajflt,
+                  &utime, &stime, &cutime, &cstime,
+                  &priority, &nice, &thcount, &start, &vsize, &rss);
+          {
+            char state_str[2];
+
+            state_str[0] = c;
+            state_str[1] = '\0';
+            tem =  build_string (state_str);
+            attrs = Fcons (Fcons (Qstate, tem), attrs);
+          }
+          /* Stops GCC whining about limited range of data type.  */
+          ppid_eint = ppid;
+          pgrp_eint = pgrp;
+          sess_eint = sess;
+          tpgid_eint = tpgid;
+          thcount_eint = thcount;
+          attrs = Fcons (Fcons (Qppid, make_fixnum_or_float (ppid_eint)), attrs);
+          attrs = Fcons (Fcons (Qpgrp, make_fixnum_or_float (pgrp_eint)), attrs);
+          attrs = Fcons (Fcons (Qsess, make_fixnum_or_float (sess_eint)), attrs);
+          attrs = Fcons (Fcons (Qttname, procfs_ttyname (tty)), attrs);
+          attrs = Fcons (Fcons (Qtpgid, make_fixnum_or_float (tpgid_eint)), attrs);
+          attrs = Fcons (Fcons (Qminflt, make_fixnum_or_float (minflt)), attrs);
+          attrs = Fcons (Fcons (Qmajflt, make_fixnum_or_float (majflt)), attrs);
+          attrs = Fcons (Fcons (Qcminflt, make_fixnum_or_float (cminflt)), attrs);
+          attrs = Fcons (Fcons (Qcmajflt, make_fixnum_or_float (cmajflt)), attrs);
+          clocks_per_sec = sysconf (_SC_CLK_TCK);
+          if (clocks_per_sec < 0)
+            clocks_per_sec = 100;
+          attrs = Fcons (Fcons (Qutime,
+                                ltime_from_jiffies (utime, clocks_per_sec)),
+                         attrs);
+          attrs = Fcons (Fcons (Qstime,
+                                ltime_from_jiffies (stime, clocks_per_sec)),
+                         attrs);
+          attrs = Fcons (Fcons (Qcutime,
+                                ltime_from_jiffies (cutime, clocks_per_sec)),
+                         attrs);
+          attrs = Fcons (Fcons (Qcstime,
+                                ltime_from_jiffies (cstime, clocks_per_sec)),
+                         attrs);
+          attrs = Fcons (Fcons (Qpri, make_number (priority)), attrs);
+          attrs = Fcons (Fcons (Qnice, make_number (nice)), attrs);
+          attrs = Fcons (Fcons (Qthcount, make_fixnum_or_float (thcount_eint)), attrs);
+          EMACS_GET_TIME (tnow);
+          get_up_time (&sec, &usec);
+          EMACS_SET_SECS (telapsed, sec);
+          EMACS_SET_USECS (telapsed, usec);
+          EMACS_SUB_TIME (tboot, tnow, telapsed);
+          time_from_jiffies (start, clocks_per_sec, &sec, &usec);
+          EMACS_SET_SECS (tstart, sec);
+          EMACS_SET_USECS (tstart, usec);
+          EMACS_ADD_TIME (tstart, tboot, tstart);
+          attrs = Fcons (Fcons (Qstart,
+                                list3 (make_number
+                                       ((EMACS_SECS (tstart) >> 16) & 0xffff),
+                                       make_number
+                                       (EMACS_SECS (tstart) & 0xffff),
+                                       make_number
+                                       (EMACS_USECS (tstart)))),
+                         attrs);
+          attrs = Fcons (Fcons (Qvsize, make_fixnum_or_float (vsize/1024)), attrs);
+          attrs = Fcons (Fcons (Qrss, make_fixnum_or_float (4*rss)), attrs);
+          EMACS_SUB_TIME (telapsed, tnow, tstart);
+          attrs = Fcons (Fcons (Qetime,
+                                list3 (make_number
+                                       ((EMACS_SECS (telapsed) >> 16) & 0xffff),
+                                       make_number
+                                       (EMACS_SECS (telapsed) & 0xffff),
+                                       make_number
+                                       (EMACS_USECS (telapsed)))),
+                         attrs);
+          time_from_jiffies (utime + stime, clocks_per_sec, &sec, &usec);
+          pcpu = (sec + usec / 1000000.0) / (EMACS_SECS (telapsed) + EMACS_USECS (telapsed) / 1000000.0);
+          if (pcpu > 1.0)
+            pcpu = 1.0;
+          attrs = Fcons (Fcons (Qpcpu, make_float (100 * pcpu)), attrs);
+          pmem = 4.0 * 100 * rss / procfs_get_total_memory ();
+          if (pmem > 100)
+            pmem = 100;
+          attrs = Fcons (Fcons (Qpmem, make_float (pmem)), attrs);
+        }
+    }
+  if (fd >= 0)
+    emacs_close (fd);
+
+  /* args */
+  strcpy (procfn_end, "/cmdline");
+  fd = emacs_open (fn, O_RDONLY, 0);
+  if (fd >= 0)
+    {
+      for (cmdline_size = 0; emacs_read (fd, &c, 1) == 1; cmdline_size++)
+        {
+          if (isspace (c) || c == '\\')
+            cmdline_size++;     /* for later quoting, see below */
+        }
+      if (cmdline_size)
+        {
+          cmdline = xmalloc (cmdline_size + 1);
+          lseek (fd, 0L, SEEK_SET);
+          cmdline[0] = '\0';
+          if ((nread = read (fd, cmdline, cmdline_size)) >= 0)
+            cmdline[nread++] = '\0';
+          else
+            {
+              /* Assigning zero to `nread' makes us skip the following
+                 two loops, assign zero to cmdline_size, and enter the
+                 following `if' clause that handles unknown command
+                 lines.  */
+              nread = 0;
+            }
+          /* We don't want trailing null characters.  */
+          for (p = cmdline + nread - 1; p > cmdline && !*p; p--)
+            nread--;
+          for (p = cmdline; p < cmdline + nread; p++)
+            {
+              /* Escape-quote whitespace and backslashes.  */
+              if (isspace (*p) || *p == '\\')
+                {
+                  memmove (p + 1, p, nread - (p - cmdline));
+                  nread++;
+                  *p++ = '\\';
+                }
+              else if (*p == '\0')
+                *p = ' ';
+            }
+          cmdline_size = nread;
+        }
+      if (!cmdline_size)
+        {
+          if (!cmd)
+            cmd = "???";
+          if (!cmdsize)
+            cmdsize = strlen (cmd);
+          cmdline_size = cmdsize + 2;
+          cmdline = xmalloc (cmdline_size + 1);
+          strcpy (cmdline, "[");
+          strcat (strncat (cmdline, cmd, cmdsize), "]");
+        }
+      emacs_close (fd);
+      /* Command line is encoded in locale-coding-system; decode it.  */
+      cmd_str = make_unibyte_string (cmdline, cmdline_size);
+      decoded_cmd = code_convert_string_norecord (cmd_str,
+                                                  Vlocale_coding_system, 0);
+      xfree (cmdline);
+      attrs = Fcons (Fcons (Qargs, decoded_cmd), attrs);
+    }
+
+  UNGCPRO;
+  return attrs;
+}
+
+#elif !defined (WINDOWSNT)
+
+Lisp_Object
+system_process_attributes (Lisp_Object pid)
+{
+  return Qnil
+}
+
+#endif  /* !defined (WINDOWSNT) */
+
 
 /* arch-tag: edb43589-4e09-4544-b325-978b5b121dcf
    (do not change this comment) */
diff --git a/src/w32.c b/src/w32.c
index c6660c0d3d6..5d70cbc48c3 100644
--- a/src/w32.c
+++ b/src/w32.c
@@ -3671,7 +3671,7 @@ BOOL WINAPI global_memory_status_ex (
 }
 
 Lisp_Object
-w32_list_system_processes ()
+list_system_processes ()
 {
   struct gcpro gcpro1;
   Lisp_Object proclist = Qnil;
@@ -3823,7 +3823,7 @@ process_times (h_proc, ctime, etime, stime, utime, pcpu)
 }
 
 Lisp_Object
-w32_system_process_attributes (pid)
+system_process_attributes (pid)
      Lisp_Object pid;
 {
   struct gcpro gcpro1, gcpro2, gcpro3;