1 /* Linux-specific PROCFS manipulation routines.
2 Copyright (C) 2009-2013 Free Software Foundation, Inc.
4 This file is part of GDB.
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 3 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program. If not, see <http://www.gnu.org/licenses/>. */
23 #include "gdb_string.h"
26 #include "linux-procfs.h"
27 #include "filestuff.h"
29 /* Return the TGID of LWPID from /proc/pid/status. Returns -1 if not
33 linux_proc_get_int (pid_t lwpid, const char *field)
35 size_t field_len = strlen (field);
40 snprintf (buf, sizeof (buf), "/proc/%d/status", (int) lwpid);
41 status_file = gdb_fopen_cloexec (buf, "r");
42 if (status_file == NULL)
44 warning (_("unable to open /proc file '%s'"), buf);
48 while (fgets (buf, sizeof (buf), status_file))
49 if (strncmp (buf, field, field_len) == 0 && buf[field_len] == ':')
51 retval = strtol (&buf[field_len + 1], NULL, 10);
59 /* Return the TGID of LWPID from /proc/pid/status. Returns -1 if not
63 linux_proc_get_tgid (pid_t lwpid)
65 return linux_proc_get_int (lwpid, "Tgid");
68 /* See linux-procfs.h. */
71 linux_proc_get_tracerpid (pid_t lwpid)
73 return linux_proc_get_int (lwpid, "TracerPid");
76 /* Return non-zero if 'State' of /proc/PID/status contains STATE. */
79 linux_proc_pid_has_state (pid_t pid, const char *state)
86 xsnprintf (buffer, sizeof (buffer), "/proc/%d/status", (int) pid);
87 procfile = gdb_fopen_cloexec (buffer, "r");
90 warning (_("unable to open /proc file '%s'"), buffer);
95 while (fgets (buffer, sizeof (buffer), procfile) != NULL)
96 if (strncmp (buffer, "State:", 6) == 0)
101 retval = (have_state && strstr (buffer, state) != NULL);
106 /* Detect `T (stopped)' in `/proc/PID/status'.
107 Other states including `T (tracing stop)' are reported as false. */
110 linux_proc_pid_is_stopped (pid_t pid)
112 return linux_proc_pid_has_state (pid, "T (stopped)");
115 /* See linux-procfs.h declaration. */
118 linux_proc_pid_is_zombie (pid_t pid)
120 return linux_proc_pid_has_state (pid, "Z (zombie)");