/* 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;
}