mirror of
https://github.com/0intro/wmii
synced 2024-11-29 09:03:25 +03:00
44 lines
797 B
C
44 lines
797 B
C
/* Copyright ©2008-2010 Kris Maglione <maglione.k at Gmail>
|
|
* See LICENSE file for license details.
|
|
*/
|
|
#include <errno.h>
|
|
#include <unistd.h>
|
|
#include "util.h"
|
|
|
|
int
|
|
spawn3(int fd[3], const char *file, char *argv[]) {
|
|
/* Some ideas from Russ Cox's libthread port. */
|
|
int p[2];
|
|
int pid;
|
|
|
|
if(pipe(p) < 0)
|
|
return -1;
|
|
closeexec(p[1]);
|
|
|
|
switch(pid = doublefork()) {
|
|
case 0:
|
|
dup2(fd[0], 0);
|
|
dup2(fd[1], 1);
|
|
dup2(fd[2], 2);
|
|
|
|
execvp(file, argv);
|
|
write(p[1], &errno, sizeof errno);
|
|
exit(1);
|
|
break;
|
|
default:
|
|
close(p[1]);
|
|
if(read(p[0], &errno, sizeof errno) == sizeof errno)
|
|
pid = -1;
|
|
close(p[0]);
|
|
break;
|
|
case -1: /* can't happen */
|
|
break;
|
|
}
|
|
|
|
close(fd[0]);
|
|
/* These could fail if any of these was also a previous fd. */
|
|
close(fd[1]);
|
|
close(fd[2]);
|
|
return pid;
|
|
}
|