fiss

Friedel's Initialization and Service Supervision
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need_restart.c (569B)

      1 #include "common.h"
      2 #include "defs.h"
      3 
      4 #include <fcntl.h>
      5 #include <stdbool.h>
      6 
      7 
      8 bool 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 }