1 /* ISC license. */
2
3 #include <sys/uio.h>
4 #include <string.h>
5 #include <errno.h>
6 #include <unistd.h>
7 #include <stdio.h>
8 #include <stdlib.h>
9 #include <skalibs/djbunix.h>
10
11 #define SUFFIX ":skalibs-openwritevnclose:XXXXXX"
12
openwritevnclose_internal(char const * fn,struct iovec const * v,unsigned int vlen,dev_t * dev,ino_t * ino,int dosync)13 int openwritevnclose_internal (char const *fn, struct iovec const *v, unsigned int vlen, dev_t *dev, ino_t *ino, int dosync)
14 {
15 dev_t tmpdev ;
16 ino_t tmpino ;
17 size_t fnlen = strlen(fn) ;
18 int fd ;
19 char tmp[fnlen + sizeof(SUFFIX)] ;
20 memcpy(tmp, fn, fnlen) ;
21 memcpy(tmp + fnlen, SUFFIX, sizeof(SUFFIX)) ;
22 fd = mkstemp(tmp) ;
23 if (fd < 0) return 0 ;
24 if (!writevnclose_unsafe_internal(fd, v, vlen, dev ? &tmpdev : 0, ino ? &tmpino : 0, dosync)) goto failclose ;
25 if (rename(tmp, fn) < 0) goto fail ;
26 if (dev) *dev = tmpdev ;
27 if (ino) *ino = tmpino ;
28 return 1 ;
29
30 failclose:
31 fd_close(fd) ;
32 fail:
33 {
34 int e = errno ;
35 unlink(tmp) ;
36 errno = e ;
37 }
38 return 0 ;
39 }
40