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
|
/* ISC license. */
#include <unistd.h>
#include <skalibs/posixplz.h>
#include <skalibs/strerr2.h>
#include <skalibs/iobuffer.h>
#include <skalibs/djbunix.h>
#include <skalibs/exec.h>
#define USAGE "seekablepipe tempfile prog..."
#define N 8192
int main (int argc, char const *const *argv)
{
iobuffer b ;
int fdr, fdw ;
int r ;
PROG = "seekablepipe" ;
if (argc < 3) strerr_dieusage(100, USAGE) ;
fdw = open_trunc(argv[1]) ;
if (fdw < 0)
strerr_diefu2sys(111, "create temporary ", argv[1]) ;
fdr = open_readb(argv[1]) ;
if (fdr < 0)
strerr_diefu3sys(111, "open ", argv[1], " for reading") ;
unlink_void(argv[1]) ;
if (ndelay_off(fdw) < 0)
strerr_diefu1sys(111, "set fdw blocking") ;
if (!iobuffer_init(&b, 0, fdw))
strerr_diefu1sys(111, "iobuffer_init") ;
while ((r = iobuffer_fill(&b)) > 0)
if (!iobuffer_flush(&b))
strerr_diefu2sys(111, "write to ", argv[1]) ;
if (r < 0) strerr_diefu1sys(111, "read from stdin") ;
iobuffer_finish(&b) ;
close(fdw) ;
if (fd_move(0, fdr) < 0)
strerr_diefu1sys(111, "move temporary file descriptor") ;
xexec(argv+2) ;
}
|
