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Merge branch 'pr2983'

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This commit is contained in:
David Lamparter 2018-09-11 16:56:30 +02:00
commit 5297438f59
1 changed files with 29 additions and 0 deletions
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29
lib/libfrr.c
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@ -262,6 +262,32 @@ bool frr_zclient_addr(struct sockaddr_storage *sa, socklen_t *sa_len,
static struct frr_daemon_info *di = NULL;
static void frr_guard_daemon(void)
{
int fd;
struct flock lock;
const char *path = di->pid_file;
fd = open(path, O_RDWR);
if (fd != -1) {
memset(&lock, 0, sizeof(lock));
lock.l_type = F_WRLCK;
lock.l_whence = SEEK_SET;
if (fcntl(fd, F_GETLK, &lock) < 0) {
flog_err_sys(LIB_ERR_SYSTEM_CALL,
"Could not do F_GETLK pid_file %s (%s), exiting",
path, safe_strerror(errno));
exit(1);
} else if (lock.l_type == F_WRLCK) {
flog_err_sys(LIB_ERR_SYSTEM_CALL,
"Process %d has a write lock on file %s already! Error: (%s)",
lock.l_pid, path, safe_strerror(errno));
exit(1);
}
close(fd);
}
}
void frr_preinit(struct frr_daemon_info *daemon, int argc, char **argv)
{
di = daemon;
@ -589,6 +615,9 @@ struct thread_master *frr_init(void)
zprivs_init(di->privs);
/* Guard to prevent a second instance of this daemon */
frr_guard_daemon();
master = thread_master_create(NULL);
signal_init(master, di->n_signals, di->signals);