need_restart.c (569B) download
1#include "common.h"
2#include "defs.h"
3
4#include <fcntl.h>
5#include <stdbool.h>
6
7
8bool need_restart(void) {
9 struct flock lock = {
10 .l_type = F_WRLCK,
11 .l_whence = SEEK_SET,
12 .l_start = 0,
13 .l_len = 0
14 };
15
16 if (service.should_restart)
17 return true;
18
19 if (fcntl(service.supervise.lock, F_GETLK, &lock) == -1)
20 errprint("unable to retrieve locks of 'supervise/depends'");
21 // F_SETLK could throw if lock couldn't be placed, F_GETLK should not throw
22 THROW_MIN(, "unable to retrieve locks of 'supervise/depends'", EXIT_PERM);
23
24 return lock.l_type != F_ULOCK;
25}