1/* See LICENSE file for copyright and license details. */
 2
 3#include <sys/stat.h>
 4
 5#include <errno.h>
 6#include <fcntl.h>
 7#include <signal.h>
 8#include <unistd.h>
 9
10#include "util.h"
11#include "wexec.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  {
29    default:
30      usage();
31  }
32  ARGEND
33
34  if (!argc)
35    usage();
36
37  if (signal(SIGHUP, SIG_IGN) == SIG_ERR)
38    enprintf(127, "signal HUP:");
39
40  if (isatty(STDOUT_FILENO)) {
41    if ((fd = open("nohup.out", O_WRONLY | O_APPEND | O_CREAT, S_IRUSR | S_IWUSR)) < 0)
42      enprintf(127, "open nohup.out:");
43    if (dup2(fd, STDOUT_FILENO) < 0)
44      enprintf(127, "dup2:");
45    close(fd);
46  }
47  if (isatty(STDERR_FILENO) && dup2(STDOUT_FILENO, STDERR_FILENO) < 0)
48    enprintf(127, "dup2:");
49
50  wexecvp_self(argv[0], argv);
51  savederrno = errno;
52  weprintf("wexecvp %s:", argv[0]);
53
54  _exit(126 + (savederrno == ENOENT));
55}