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/*
Authors:
Pavel Březina <pbrezina@redhat.com>
Copyright (C) 2016 Red Hat
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 <stdlib.h>
#include <stdio.h>
#include <signal.h>
#include "util/util.h"
#include "tools/common/sss_process.h"
static pid_t parse_pid(const char *strpid)
{
long value;
char *endptr;
errno = 0;
value = strtol(strpid, &endptr, 10);
if ((errno != 0) || (endptr == strpid)
|| ((*endptr != '\0') && (*endptr != '\n'))) {
return 0;
}
return value;
}
static errno_t sss_pid(pid_t *out_pid)
{
int ret;
size_t fsize;
FILE *pid_file;
char pid_str[MAX_PID_LENGTH] = {'\0'};
*out_pid = 0;
errno = 0;
pid_file = fopen(SSSD_PIDFILE, "r");
if (pid_file == NULL) {
ret = errno;
DEBUG(SSSDBG_MINOR_FAILURE, "Unable to open pid file \"%s\": %s\n",
SSSD_PIDFILE, strerror(ret));
goto done;
}
fsize = fread(pid_str, sizeof(char), MAX_PID_LENGTH * sizeof(char),
pid_file);
if (!feof(pid_file)) {
/* eof not reached */
ret = ferror(pid_file);
if (ret != 0) {
DEBUG(SSSDBG_CRIT_FAILURE, "Unable to read from file \"%s\": %s\n",
SSSD_PIDFILE, strerror(ret));
} else {
DEBUG(SSSDBG_CRIT_FAILURE, "File \"%s\" contains invalid pid.\n",
SSSD_PIDFILE);
}
goto done;
}
if (fsize == 0) {
DEBUG(SSSDBG_CRIT_FAILURE, "File \"%s\" contains no pid.\n",
SSSD_PIDFILE);
ret = EINVAL;
goto done;
}
pid_str[MAX_PID_LENGTH-1] = '\0';
*out_pid = parse_pid(pid_str);
if (*out_pid == 0) {
DEBUG(SSSDBG_CRIT_FAILURE,
"File \"%s\" contains invalid pid.\n", SSSD_PIDFILE);
ret = EINVAL;
goto done;
}
ret = EOK;
done:
if (pid_file != NULL) {
fclose(pid_file);
}
return ret;
}
bool sss_daemon_running(void)
{
return sss_signal(0) == EOK;
}
errno_t sss_signal(int signum)
{
int ret;
pid_t pid;
ret = sss_pid(&pid);
if (ret != EOK) {
return ret;
}
if (kill(pid, signum) != 0) {
ret = errno;
DEBUG(SSSDBG_CRIT_FAILURE,
"Could not send signal %d to process %d: %s\n",
signum, pid, strerror(errno));
return ret;
}
return EOK;
}
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