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
35
36
37
38
39
40
41
42
43
|
/* ISC license. */
#include <skalibs/nonposix.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <skalibs/fcntl.h>
#include <skalibs/djbunix.h>
#include <skalibs/socket.h>
int ipc_bind_reuse_lock_perms (int s, char const *p, int *fdlock, unsigned int perms)
{
unsigned int opt = 1 ;
size_t len = strlen(p) ;
int fd ;
int r ;
mode_t m ;
char lockname[len + 6] ;
memcpy(lockname, p, len) ;
memcpy(lockname + len, ".lock", 6) ;
fd = open3(lockname, O_WRONLY | O_NONBLOCK | O_CREAT | O_CLOEXEC, 0600) ;
if (fd < 0) return -1 ;
r = fd_lock(fd, 1, 1) ;
if (r < 0) return -1 ;
if (!r) return (errno = EBUSY, -1) ;
r = errno ;
setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof opt) ;
errno = r ;
unlink_void(p) ;
if (perms) m = umask(~perms & 0777) ;
if (ipc_bind(s, p) < 0)
{
if (perms) umask(m) ;
return -1 ;
}
if (perms) umask(m) ;
*fdlock = fd ;
return 0 ;
}
|
