src/libstddjb/lock_ex.c


1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34

/* ISC license. */

#include <skalibs/sysdeps.h>

#ifdef SKALIBS_HASFLOCK

#include <skalibs/nonposix.h>
#include <errno.h>
#include <sys/file.h>
#include <skalibs/djbunix.h>

int lock_ex (int fd)
{
  int r ;
  do r = flock(fd, LOCK_EX) ;
  while ((r == -1) && (errno == EINTR)) ;
  return r ;
}

#else

#include <unistd.h>
#include <errno.h>
#include <skalibs/djbunix.h>

int lock_ex (int fd)
{
  int r ;
  do r = lockf(fd, F_LOCK, 0) ;
  while ((r == -1) && (errno == EINTR)) ;
  return r ;
}

#endif