1 /* Linux-specific PROCFS manipulation routines. 2 Copyright (C) 2009-2013 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 } 121