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13da1c97 | 1 | /* Linux-specific PROCFS manipulation routines. |
0b302171 | 2 | Copyright (C) 2009-2012 Free Software Foundation, Inc. |
13da1c97 LM |
3 | |
4 | This file is part of GDB. | |
5 | ||
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. | |
10 | ||
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. | |
15 | ||
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/>. */ | |
18 | ||
19 | #ifdef GDBSERVER | |
20 | #include "server.h" | |
21 | #else | |
22 | #include "defs.h" | |
23 | #include "gdb_string.h" | |
24 | #endif | |
25 | ||
26 | #include "linux-procfs.h" | |
27 | ||
28 | /* Return the TGID of LWPID from /proc/pid/status. Returns -1 if not | |
29 | found. */ | |
30 | ||
87b0bb13 JK |
31 | static int |
32 | linux_proc_get_int (pid_t lwpid, const char *field) | |
13da1c97 | 33 | { |
87b0bb13 | 34 | size_t field_len = strlen (field); |
13da1c97 LM |
35 | FILE *status_file; |
36 | char buf[100]; | |
87b0bb13 | 37 | int retval = -1; |
13da1c97 LM |
38 | |
39 | snprintf (buf, sizeof (buf), "/proc/%d/status", (int) lwpid); | |
40 | status_file = fopen (buf, "r"); | |
87b0bb13 | 41 | if (status_file == NULL) |
13da1c97 | 42 | { |
87b0bb13 JK |
43 | warning (_("unable to open /proc file '%s'"), buf); |
44 | return -1; | |
13da1c97 LM |
45 | } |
46 | ||
87b0bb13 JK |
47 | while (fgets (buf, sizeof (buf), status_file)) |
48 | if (strncmp (buf, field, field_len) == 0 && buf[field_len] == ':') | |
49 | { | |
50 | retval = strtol (&buf[field_len + 1], NULL, 10); | |
51 | break; | |
52 | } | |
53 | ||
54 | fclose (status_file); | |
55 | return retval; | |
13da1c97 | 56 | } |
644cebc9 | 57 | |
87b0bb13 JK |
58 | /* Return the TGID of LWPID from /proc/pid/status. Returns -1 if not |
59 | found. */ | |
644cebc9 PA |
60 | |
61 | int | |
87b0bb13 | 62 | linux_proc_get_tgid (pid_t lwpid) |
644cebc9 | 63 | { |
87b0bb13 JK |
64 | return linux_proc_get_int (lwpid, "Tgid"); |
65 | } | |
644cebc9 | 66 | |
87b0bb13 JK |
67 | /* See linux-procfs.h. */ |
68 | ||
69 | pid_t | |
70 | linux_proc_get_tracerpid (pid_t lwpid) | |
71 | { | |
72 | return linux_proc_get_int (lwpid, "TracerPid"); | |
644cebc9 | 73 | } |
5f572dec | 74 | |
87b0bb13 | 75 | /* Return non-zero if 'State' of /proc/PID/status contains STATE. */ |
5f572dec | 76 | |
87b0bb13 JK |
77 | static int |
78 | linux_proc_pid_has_state (pid_t pid, const char *state) | |
5f572dec JK |
79 | { |
80 | char buffer[100]; | |
81 | FILE *procfile; | |
82 | int retval; | |
83 | int have_state; | |
84 | ||
85 | xsnprintf (buffer, sizeof (buffer), "/proc/%d/status", (int) pid); | |
86 | procfile = fopen (buffer, "r"); | |
87 | if (procfile == NULL) | |
88 | { | |
89 | warning (_("unable to open /proc file '%s'"), buffer); | |
90 | return 0; | |
91 | } | |
92 | ||
93 | have_state = 0; | |
94 | while (fgets (buffer, sizeof (buffer), procfile) != NULL) | |
95 | if (strncmp (buffer, "State:", 6) == 0) | |
96 | { | |
97 | have_state = 1; | |
98 | break; | |
99 | } | |
87b0bb13 | 100 | retval = (have_state && strstr (buffer, state) != NULL); |
5f572dec JK |
101 | fclose (procfile); |
102 | return retval; | |
103 | } | |
87b0bb13 JK |
104 | |
105 | /* Detect `T (stopped)' in `/proc/PID/status'. | |
106 | Other states including `T (tracing stop)' are reported as false. */ | |
107 | ||
108 | int | |
109 | linux_proc_pid_is_stopped (pid_t pid) | |
110 | { | |
111 | return linux_proc_pid_has_state (pid, "T (stopped)"); | |
112 | } | |
113 | ||
114 | /* See linux-procfs.h declaration. */ | |
115 | ||
116 | int | |
117 | linux_proc_pid_is_zombie (pid_t pid) | |
118 | { | |
119 | return linux_proc_pid_has_state (pid, "Z (zombie)"); | |
120 | } |