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/* Linux-specific PROCFS manipulation routines.
Copyright (C) 2009-2014 Free Software Foundation, Inc.
This file is part of GDB.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include "common-defs.h"
#include "linux-procfs.h"
#include "filestuff.h"
/* Return the TGID of LWPID from /proc/pid/status. Returns -1 if not
found. */
static int
linux_proc_get_int (pid_t lwpid, const char *field)
{
size_t field_len = strlen (field);
FILE *status_file;
char buf[100];
int retval = -1;
snprintf (buf, sizeof (buf), "/proc/%d/status", (int) lwpid);
status_file = gdb_fopen_cloexec (buf, "r");
if (status_file == NULL)
{
warning (_("unable to open /proc file '%s'"), buf);
return -1;
}
while (fgets (buf, sizeof (buf), status_file))
if (strncmp (buf, field, field_len) == 0 && buf[field_len] == ':')
{
retval = strtol (&buf[field_len + 1], NULL, 10);
break;
}
fclose (status_file);
return retval;
}
/* Return the TGID of LWPID from /proc/pid/status. Returns -1 if not
found. */
int
linux_proc_get_tgid (pid_t lwpid)
{
return linux_proc_get_int (lwpid, "Tgid");
}
/* See linux-procfs.h. */
pid_t
linux_proc_get_tracerpid (pid_t lwpid)
{
return linux_proc_get_int (lwpid, "TracerPid");
}
/* Return non-zero if 'State' of /proc/PID/status contains STATE. */
static int
linux_proc_pid_has_state (pid_t pid, const char *state)
{
char buffer[100];
FILE *procfile;
int retval;
int have_state;
xsnprintf (buffer, sizeof (buffer), "/proc/%d/status", (int) pid);
procfile = gdb_fopen_cloexec (buffer, "r");
if (procfile == NULL)
{
warning (_("unable to open /proc file '%s'"), buffer);
return 0;
}
have_state = 0;
while (fgets (buffer, sizeof (buffer), procfile) != NULL)
if (strncmp (buffer, "State:", 6) == 0)
{
have_state = 1;
break;
}
retval = (have_state && strstr (buffer, state) != NULL);
fclose (procfile);
return retval;
}
/* Detect `T (stopped)' in `/proc/PID/status'.
Other states including `T (tracing stop)' are reported as false. */
int
linux_proc_pid_is_stopped (pid_t pid)
{
return linux_proc_pid_has_state (pid, "T (stopped)");
}
/* See linux-procfs.h declaration. */
int
linux_proc_pid_is_zombie (pid_t pid)
{
return linux_proc_pid_has_state (pid, "Z (zombie)");
}
/* See linux-procfs.h declaration. */
char *
linux_proc_pid_get_ns (pid_t pid, const char *ns)
{
char buf[100];
char nsval[64];
int ret;
xsnprintf (buf, sizeof (buf), "/proc/%d/ns/%s", (int) pid, ns);
ret = readlink (buf, nsval, sizeof (nsval));
if (0 < ret && ret < sizeof (nsval))
{
nsval[ret] = '\0';
return xstrdup (nsval);
}
return NULL;
}
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