mirror of git://git.suckless.org/ubase
55 lines
870 B
C
55 lines
870 B
C
|
/* See LICENSE file for copyright and license details. */
|
||
|
|
#include <errno.h>
|
||
|
|
#include <stdlib.h>
|
||
|
|
#include <sys/types.h>
|
||
|
|
#include <sys/wait.h>
|
||
|
|
#include <unistd.h>
|
||
|
|
#include "util.h"
|
||
|
|
|
||
|
|
static void
|
||
|
|
usage(void)
|
||
|
|
{
|
||
|
|
eprintf("usage: respawn [-d N] cmd [args...]\n");
|
||
|
|
}
|
||
|
|
|
||
|
|
int
|
||
|
|
main(int argc, char **argv)
|
||
|
|
{
|
||
|
|
pid_t pid;
|
||
|
|
int savederrno;
|
||
|
|
unsigned int delay = 0;
|
||
|
|
|
||
|
|
ARGBEGIN {
|
||
|
|
case 'd':
|
||
|
|
delay = estrtol(EARGF(usage()), 0);
|
||
|
|
break;
|
||
|
|
default:
|
||
|
|
usage();
|
||
|
|
} ARGEND;
|
||
|
|
|
||
|
|
if(argc < 1)
|
||
|
|
usage();
|
||
|
|
|
||
|
|
while (1) {
|
||
|
|
pid = fork();
|
||
|
|
if (pid < 0)
|
||
|
|
eprintf("fork:");
|
||
|
|
switch (pid) {
|
||
|
|
case 0:
|
||
|
|
if (setsid() < 0)
|
||
|
|
eprintf("setsid:");
|
||
|
|
execvp(argv[0], argv);
|
||
|
|
savederrno = errno;
|
||
|
|
weprintf("execvp %s:", argv[0]);
|
||
|
|
_exit(savederrno == ENOENT ? 127 : 126);
|
||
|
|
break;
|
||
|
|
default:
|
||
|
|
waitpid(pid, NULL, 0);
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
sleep(delay);
|
||
|
|
}
|
||
|
|
/* not reachable */
|
||
|
|
return EXIT_SUCCESS;
|
||
|
|
}
|