1 /* Linux-specific PROCFS manipulation routines.
2 Copyright (C) 2009-2012 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"
28 /* Return the TGID of LWPID from /proc/pid/status. Returns -1 if not
32 linux_proc_get_int (pid_t lwpid
, const char *field
)
34 size_t field_len
= strlen (field
);
39 snprintf (buf
, sizeof (buf
), "/proc/%d/status", (int) lwpid
);
40 status_file
= fopen (buf
, "r");
41 if (status_file
== NULL
)
43 warning (_("unable to open /proc file '%s'"), buf
);
47 while (fgets (buf
, sizeof (buf
), status_file
))
48 if (strncmp (buf
, field
, field_len
) == 0 && buf
[field_len
] == ':')
50 retval
= strtol (&buf
[field_len
+ 1], NULL
, 10);
58 /* Return the TGID of LWPID from /proc/pid/status. Returns -1 if not
62 linux_proc_get_tgid (pid_t lwpid
)
64 return linux_proc_get_int (lwpid
, "Tgid");
67 /* See linux-procfs.h. */
70 linux_proc_get_tracerpid (pid_t lwpid
)
72 return linux_proc_get_int (lwpid
, "TracerPid");
75 /* Return non-zero if 'State' of /proc/PID/status contains STATE. */
78 linux_proc_pid_has_state (pid_t pid
, const char *state
)
85 xsnprintf (buffer
, sizeof (buffer
), "/proc/%d/status", (int) pid
);
86 procfile
= fopen (buffer
, "r");
89 warning (_("unable to open /proc file '%s'"), buffer
);
94 while (fgets (buffer
, sizeof (buffer
), procfile
) != NULL
)
95 if (strncmp (buffer
, "State:", 6) == 0)
100 retval
= (have_state
&& strstr (buffer
, state
) != NULL
);
105 /* Detect `T (stopped)' in `/proc/PID/status'.
106 Other states including `T (tracing stop)' are reported as false. */
109 linux_proc_pid_is_stopped (pid_t pid
)
111 return linux_proc_pid_has_state (pid
, "T (stopped)");
114 /* See linux-procfs.h declaration. */
117 linux_proc_pid_is_zombie (pid_t pid
)
119 return linux_proc_pid_has_state (pid
, "Z (zombie)");
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