1/* See LICENSE file for copyright and license details. */
 2
 3
 4#include <sys/stat.h>
 5
 6#include <errno.h>
 7#include <fcntl.h>
 8#include <signal.h>
 9#include <unistd.h>
10
11#include "util.h"
12
13static void
14usage(void)
15{
16	eprintf("usage: %s cmd [arg ...]\n", argv0);
17}
18
19// ?man nohup: run command immune to hangups
20// ?man arguments: cmd [arg ...
21// ?man run a command that persists after logging out
22int
23main(int argc, char *argv[])
24{
25	int fd, savederrno;
26
27	ARGBEGIN {
28	default:
29		usage();
30	} ARGEND
31
32	if (!argc)
33		usage();
34
35	if (signal(SIGHUP, SIG_IGN) == SIG_ERR)
36		enprintf(127, "signal HUP:");
37
38	if (isatty(STDOUT_FILENO)) {
39		if ((fd = open("nohup.out", O_WRONLY | O_APPEND | O_CREAT, S_IRUSR | S_IWUSR)) < 0)
40			enprintf(127, "open nohup.out:");
41		if (dup2(fd, STDOUT_FILENO) < 0)
42			enprintf(127, "dup2:");
43		close(fd);
44	}
45	if (isatty(STDERR_FILENO) && dup2(STDOUT_FILENO, STDERR_FILENO) < 0)
46		enprintf(127, "dup2:");
47
48	execvp(argv[0], argv);
49	savederrno = errno;
50	weprintf("execvp %s:", argv[0]);
51
52	_exit(126 + (savederrno == ENOENT));
53}