1 /* vi: set sw=4 ts=4: */
2 /* nohup - invoke a utility immune to hangups.
4 * Busybox version based on nohup specification at
5 * http://www.opengroup.org/onlinepubs/007904975/utilities/nohup.html
7 * Copyright 2006 Rob Landley <rob@landley.net>
8 * Copyright 2006 Bernhard Reutner-Fischer
10 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
15 /* Compat info: nohup (GNU coreutils 6.8) does this:
17 nohup: ignoring input and appending output to `nohup.out'
18 # nohup true 1>/dev/null
19 nohup: ignoring input and redirecting stderr to stdout
22 nohup: ignoring input and appending output to `nohup.out'
23 # nohup true 2>zz 1>/dev/null
26 # nohup true </dev/null 1>/dev/null
27 nohup: redirecting stderr to stdout
28 # nohup true </dev/null 2>zz 1>/dev/null
34 int nohup_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
35 int nohup_main(int argc, char **argv)
40 xfunc_error_retval = 127;
42 if (argc < 2) bb_show_usage();
44 /* If stdin is a tty, detach from it. */
45 if (isatty(STDIN_FILENO)) {
46 /* bb_error_msg("ignoring input"); */
48 xopen(bb_dev_null, O_RDONLY); /* will be fd 0 (STDIN_FILENO) */
51 nohupout = "nohup.out";
52 /* Redirect stdout to nohup.out, either in "." or in "$HOME". */
53 if (isatty(STDOUT_FILENO)) {
55 if (open(nohupout, O_CREAT|O_WRONLY|O_APPEND, S_IRUSR|S_IWUSR) < 0) {
56 home = getenv("HOME");
58 nohupout = concat_path_file(home, nohupout);
59 xopen3(nohupout, O_CREAT|O_WRONLY|O_APPEND, S_IRUSR|S_IWUSR);
61 xopen(bb_dev_null, O_RDONLY); /* will be fd 1 */
64 bb_error_msg("appending output to %s", nohupout);
67 /* If we have a tty on stderr, redirect to stdout. */
68 if (isatty(STDERR_FILENO)) {
69 /* if (stdout_wasnt_a_tty)
70 bb_error_msg("redirecting stderr to stdout"); */
71 dup2(STDOUT_FILENO, STDERR_FILENO);
74 signal(SIGHUP, SIG_IGN);
76 BB_EXECVP(argv[1], argv+1);
77 bb_simple_perror_msg_and_die(argv[1]);