28e7fd6234
Two modifications:
1. The addition of 2013 to the copyright year range for every file;
2. The use of a single year range, instead of potentially multiple
year ranges, as approved by the FSF.
120 lines
2.9 KiB
C
120 lines
2.9 KiB
C
/* Linux-specific PROCFS manipulation routines.
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Copyright (C) 2009-2013 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#ifdef GDBSERVER
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#include "server.h"
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#else
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#include "defs.h"
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#include "gdb_string.h"
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#endif
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#include "linux-procfs.h"
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/* Return the TGID of LWPID from /proc/pid/status. Returns -1 if not
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found. */
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static int
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linux_proc_get_int (pid_t lwpid, const char *field)
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{
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size_t field_len = strlen (field);
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FILE *status_file;
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char buf[100];
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int retval = -1;
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snprintf (buf, sizeof (buf), "/proc/%d/status", (int) lwpid);
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status_file = fopen (buf, "r");
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if (status_file == NULL)
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{
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warning (_("unable to open /proc file '%s'"), buf);
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return -1;
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}
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while (fgets (buf, sizeof (buf), status_file))
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if (strncmp (buf, field, field_len) == 0 && buf[field_len] == ':')
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{
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retval = strtol (&buf[field_len + 1], NULL, 10);
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break;
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}
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fclose (status_file);
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return retval;
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}
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/* Return the TGID of LWPID from /proc/pid/status. Returns -1 if not
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found. */
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int
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linux_proc_get_tgid (pid_t lwpid)
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{
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return linux_proc_get_int (lwpid, "Tgid");
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}
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/* See linux-procfs.h. */
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pid_t
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linux_proc_get_tracerpid (pid_t lwpid)
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{
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return linux_proc_get_int (lwpid, "TracerPid");
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}
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/* Return non-zero if 'State' of /proc/PID/status contains STATE. */
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static int
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linux_proc_pid_has_state (pid_t pid, const char *state)
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{
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char buffer[100];
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FILE *procfile;
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int retval;
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int have_state;
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xsnprintf (buffer, sizeof (buffer), "/proc/%d/status", (int) pid);
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procfile = fopen (buffer, "r");
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if (procfile == NULL)
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{
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warning (_("unable to open /proc file '%s'"), buffer);
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return 0;
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}
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have_state = 0;
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while (fgets (buffer, sizeof (buffer), procfile) != NULL)
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if (strncmp (buffer, "State:", 6) == 0)
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{
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have_state = 1;
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break;
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}
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retval = (have_state && strstr (buffer, state) != NULL);
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fclose (procfile);
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return retval;
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}
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/* Detect `T (stopped)' in `/proc/PID/status'.
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Other states including `T (tracing stop)' are reported as false. */
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int
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linux_proc_pid_is_stopped (pid_t pid)
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{
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return linux_proc_pid_has_state (pid, "T (stopped)");
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}
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/* See linux-procfs.h declaration. */
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int
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linux_proc_pid_is_zombie (pid_t pid)
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{
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return linux_proc_pid_has_state (pid, "Z (zombie)");
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}
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