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
48
49
50
51
|
/* ISC license. */
#include <sys/stat.h>
#include <string.h>
#include <errno.h>
#include <stdlib.h>
#include <stdio.h>
#include <skalibs/bytestr.h>
#include <skalibs/env.h>
#include <skalibs/djbunix.h>
/* XXX: breaks layering, but really openat() should be supported everywhere */
#include <skalibs/unix-transactional.h>
#define SUFFIX ":envdump:XXXXXX"
int env_dump (char const *dir, mode_t mode, char const *const *envp)
{
int fd ;
size_t dirlen = strlen(dir) ;
char tmpdir[dirlen + sizeof(SUFFIX)] ;
memcpy(tmpdir, dir, dirlen) ;
memcpy(tmpdir + dirlen, SUFFIX, sizeof(SUFFIX)) ;
if (!mkdtemp(tmpdir)) return 0 ;
fd = open_read(tmpdir) ;
if (fd == -1) goto err ;
for (; *envp ; envp++)
{
size_t len = str_chr(*envp, '=') ;
size_t vallen = strlen(*envp + len + 1) ;
char fn[len + 1] ;
memcpy(fn, *envp, len + 1) ;
len = openwritenclose_at(fd, fn, *envp + len + 1, vallen) ;
if (len < vallen) goto cerr ;
}
fd_close(fd) ;
if (chmod(tmpdir, mode) == -1) goto err ;
if (rename(tmpdir, dir) == -1) goto err ;
return 1 ;
cerr:
fd_close(fd) ;
err:
{
int e = errno ;
rm_rf(tmpdir) ;
errno = e ;
}
return 0 ;
}
|
