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
44
45
46
47
|
/* ISC license. */
#include <string.h>
#include <errno.h>
#include <skalibs/djbunix.h>
#include <s6-rc/s6rc-utils.h>
int s6rc_lock (char const *live, int lwhat, int *llfd, char const *compiled, int cwhat, int *ccfd)
{
int e = 0 ;
int lfd = -1, cfd = -1 ;
if (lwhat)
{
size_t llen = strlen(live) ;
char lfn[llen + 6] ;
memcpy(lfn, live, llen) ;
memcpy(lfn + llen, "/lock", 6) ;
lfd = open_create(lfn) ;
if (lfd < 0) return 0 ;
if ((lwhat > 1 ? lock_ex(lfd) : lock_sh(lfd)) < 0) { e = errno ; goto lerr ; }
}
if (cwhat)
{
size_t clen = strlen(compiled) ;
char cfn[clen + 6] ;
memcpy(cfn, compiled, clen) ;
memcpy(cfn + clen, "/lock", 6) ;
cfd = open_create(cfn) ;
if (cfd < 0)
if (cwhat > 1 || errno != EROFS) { e = errno ; goto lerr ; }
else cfd = -errno ;
else if ((cwhat > 1 ? lock_ex(cfd) : lock_sh(cfd)) < 0) { e = errno ; goto cerr ; }
}
if (lwhat) *llfd = lfd ;
if (cwhat) *ccfd = cfd ;
return 1 ;
cerr:
fd_close(cfd) ;
lerr:
if (lwhat) fd_close(lfd) ;
errno = e ;
return 0 ;
}
|
