| 1 | /* Linux-specific PROCFS manipulation routines. |
| 2 | Copyright (C) 2009-2012 Free Software Foundation, Inc. |
| 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 | |
| 31 | static int |
| 32 | linux_proc_get_int (pid_t lwpid, const char *field) |
| 33 | { |
| 34 | size_t field_len = strlen (field); |
| 35 | FILE *status_file; |
| 36 | char buf[100]; |
| 37 | int retval = -1; |
| 38 | |
| 39 | snprintf (buf, sizeof (buf), "/proc/%d/status", (int) lwpid); |
| 40 | status_file = fopen (buf, "r"); |
| 41 | if (status_file == NULL) |
| 42 | { |
| 43 | warning (_("unable to open /proc file '%s'"), buf); |
| 44 | return -1; |
| 45 | } |
| 46 | |
| 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; |
| 56 | } |
| 57 | |
| 58 | /* Return the TGID of LWPID from /proc/pid/status. Returns -1 if not |
| 59 | found. */ |
| 60 | |
| 61 | int |
| 62 | linux_proc_get_tgid (pid_t lwpid) |
| 63 | { |
| 64 | return linux_proc_get_int (lwpid, "Tgid"); |
| 65 | } |
| 66 | |
| 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"); |
| 73 | } |
| 74 | |
| 75 | /* Return non-zero if 'State' of /proc/PID/status contains STATE. */ |
| 76 | |
| 77 | static int |
| 78 | linux_proc_pid_has_state (pid_t pid, const char *state) |
| 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 | } |
| 100 | retval = (have_state && strstr (buffer, state) != NULL); |
| 101 | fclose (procfile); |
| 102 | return retval; |
| 103 | } |
| 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 | } |