Merge GDB 7.5.1

gdb/common/linux-procfs.c

 /* Linux-specific PROCFS manipulation routines.
    Copyright (C) 2009-2012 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.
 
@@ skipping 10 matching lines @@
 #else
 #include "defs.h"
 #include "gdb_string.h"
 #endif
 
 #include "linux-procfs.h"
 
 /* Return the TGID of LWPID from /proc/pid/status.  Returns -1 if not
    found.  */
 
+static int
+linux_proc_get_int (pid_t lwpid, const char *field)
+{
+  size_t field_len = strlen (field);
+  FILE *status_file;
+  char buf[100];
+  int retval = -1;
+
+  snprintf (buf, sizeof (buf), "/proc/%d/status", (int) lwpid);
+  status_file = fopen (buf, "r");
+  if (status_file == NULL)
+    {
+      warning (_("unable to open /proc file '%s'"), buf);
+      return -1;
+    }
+
+  while (fgets (buf, sizeof (buf), status_file))
+    if (strncmp (buf, field, field_len) == 0 && buf[field_len] == ':')
+      {
+        retval = strtol (&buf[field_len + 1], NULL, 10);
+        break;
+      }
+
+  fclose (status_file);
+  return retval;
+}
+
+/* Return the TGID of LWPID from /proc/pid/status.  Returns -1 if not
+   found.  */
+
 int
-linux_proc_get_tgid (int lwpid)
+linux_proc_get_tgid (pid_t lwpid)
 {
-  FILE *status_file;
-  char buf[100];
-  int tgid = -1;
+  return linux_proc_get_int (lwpid, "Tgid");
+}
 
-  snprintf (buf, sizeof (buf), "/proc/%d/status", (int) lwpid);
-  status_file = fopen (buf, "r");
-  if (status_file != NULL)
+/* See linux-procfs.h.  */
+
+pid_t
+linux_proc_get_tracerpid (pid_t lwpid)
+{
+  return linux_proc_get_int (lwpid, "TracerPid");
+}
+
+/* Return non-zero if 'State' of /proc/PID/status contains STATE.  */
+
+static int
+linux_proc_pid_has_state (pid_t pid, const char *state)
+{
+  char buffer[100];
+  FILE *procfile;
+  int retval;
+  int have_state;
+
+  xsnprintf (buffer, sizeof (buffer), "/proc/%d/status", (int) pid);
+  procfile = fopen (buffer, "r");
+  if (procfile == NULL)
     {
-      while (fgets (buf, sizeof (buf), status_file))
-        {
-          if (strncmp (buf, "Tgid:", 5) == 0)
-            {
-              tgid = strtoul (buf + strlen ("Tgid:"), NULL, 10);
-              break;
-            }
-        }
-
-      fclose (status_file);
+      warning (_("unable to open /proc file '%s'"), buffer);
+      return 0;
     }
 
-  return tgid;
+  have_state = 0;
+  while (fgets (buffer, sizeof (buffer), procfile) != NULL)
+    if (strncmp (buffer, "State:", 6) == 0)
+      {
+        have_state = 1;
+        break;
+      }
+  retval = (have_state && strstr (buffer, state) != NULL);
+  fclose (procfile);
+  return retval;
 }
+
+/* Detect `T (stopped)' in `/proc/PID/status'.
+   Other states including `T (tracing stop)' are reported as false.  */
+
+int
+linux_proc_pid_is_stopped (pid_t pid)
+{
+  return linux_proc_pid_has_state (pid, "T (stopped)");
+}
+
+/* See linux-procfs.h declaration.  */
+
+int
+linux_proc_pid_is_zombie (pid_t pid)
+{
+  return linux_proc_pid_has_state (pid, "Z (zombie)");
+}