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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Process id output.
* Copyright (C) 1998, 1999 Kunihiro Ishiguro
*/
#include <zebra.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <log.h>
#include "lib/version.h"
#include "network.h"
#include "lib_errors.h"
#define PIDFILE_MASK 0644
pid_t pid_output(const char *path)
{
int tmp;
int fd;
pid_t pid;
char buf[16];
struct flock lock;
mode_t oldumask;
pid = getpid();
oldumask = umask(0777 & ~PIDFILE_MASK);
fd = open(path, O_RDWR | O_CREAT, PIDFILE_MASK);
if (fd < 0) {
flog_err_sys(EC_LIB_SYSTEM_CALL,
"Can't create pid lock file %s (%s), exiting",
path, safe_strerror(errno));
umask(oldumask);
exit(1);
} else {
size_t pidsize;
umask(oldumask);
memset(&lock, 0, sizeof(lock));
set_cloexec(fd);
lock.l_type = F_WRLCK;
lock.l_whence = SEEK_SET;
if (fcntl(fd, F_SETLK, &lock) < 0) {
flog_err_sys(EC_LIB_SYSTEM_CALL,
"Could not lock pid_file %s (%s), exiting. Please ensure that the daemon is not already running",
path, safe_strerror(errno));
exit(1);
}
snprintf(buf, sizeof(buf), "%d\n", (int)pid);
pidsize = strlen(buf);
if ((tmp = write(fd, buf, pidsize)) != (int)pidsize)
flog_err_sys(
EC_LIB_SYSTEM_CALL,
"Could not write pid %d to pid_file %s, rc was %d: %s",
(int)pid, path, tmp, safe_strerror(errno));
else if (ftruncate(fd, pidsize) < 0)
flog_err_sys(
EC_LIB_SYSTEM_CALL,
"Could not truncate pid_file %s to %u bytes: %s",
path, (unsigned int)pidsize,
safe_strerror(errno));
}
return pid;
}
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