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 source tree.
13 //usage:#define nohup_trivial_usage
15 //usage:#define nohup_full_usage "\n\n"
16 //usage: "Run PROG immune to hangups, with output to a non-tty"
18 //usage:#define nohup_example_usage
19 //usage: "$ nohup make &"
23 /* Compat info: nohup (GNU coreutils 6.8) does this:
25 nohup: ignoring input and appending output to `nohup.out'
26 # nohup true 1>/dev/null
27 nohup: ignoring input and redirecting stderr to stdout
30 nohup: ignoring input and appending output to `nohup.out'
31 # nohup true 2>zz 1>/dev/null
34 # nohup true </dev/null 1>/dev/null
35 nohup: redirecting stderr to stdout
36 # nohup true </dev/null 2>zz 1>/dev/null
42 int nohup_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
43 int nohup_main(int argc UNUSED_PARAM, char **argv)
48 xfunc_error_retval = 127;
54 /* If stdin is a tty, detach from it. */
55 if (isatty(STDIN_FILENO)) {
56 /* bb_error_msg("ignoring input"); */
58 xopen(bb_dev_null, O_RDONLY); /* will be fd 0 (STDIN_FILENO) */
61 nohupout = "nohup.out";
62 /* Redirect stdout to nohup.out, either in "." or in "$HOME". */
63 if (isatty(STDOUT_FILENO)) {
65 if (open(nohupout, O_CREAT|O_WRONLY|O_APPEND, S_IRUSR|S_IWUSR) < 0) {
66 home = getenv("HOME");
68 nohupout = concat_path_file(home, nohupout);
69 xopen3(nohupout, O_CREAT|O_WRONLY|O_APPEND, S_IRUSR|S_IWUSR);
71 xopen(bb_dev_null, O_RDONLY); /* will be fd 1 */
74 bb_error_msg("appending output to %s", nohupout);
77 /* If we have a tty on stderr, redirect to stdout. */
78 if (isatty(STDERR_FILENO)) {
79 /* if (stdout_wasnt_a_tty)
80 bb_error_msg("redirecting stderr to stdout"); */
81 dup2(STDOUT_FILENO, STDERR_FILENO);
84 signal(SIGHUP, SIG_IGN);
87 BB_EXECVP_or_die(argv);