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 //config: bool "nohup (2 kb)"
16 //config: run a command immune to hangups, with output to a non-tty.
18 //applet:IF_NOHUP(APPLET(nohup, BB_DIR_USR_BIN, BB_SUID_DROP))
20 //kbuild:lib-$(CONFIG_NOHUP) += nohup.o
22 //usage:#define nohup_trivial_usage
24 //usage:#define nohup_full_usage "\n\n"
25 //usage: "Run PROG immune to hangups, with output to a non-tty"
27 //usage:#define nohup_example_usage
28 //usage: "$ nohup make &"
32 /* Compat info: nohup (GNU coreutils 6.8) does this:
34 nohup: ignoring input and appending output to `nohup.out'
35 # nohup true 1>/dev/null
36 nohup: ignoring input and redirecting stderr to stdout
39 nohup: ignoring input and appending output to `nohup.out'
40 # nohup true 2>zz 1>/dev/null
43 # nohup true </dev/null 1>/dev/null
44 nohup: redirecting stderr to stdout
45 # nohup true </dev/null 2>zz 1>/dev/null
51 int nohup_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
52 int nohup_main(int argc UNUSED_PARAM, char **argv)
57 xfunc_error_retval = 127;
63 /* If stdin is a tty, detach from it. */
64 if (isatty(STDIN_FILENO)) {
65 /* bb_error_msg("ignoring input"); */
67 xopen(bb_dev_null, O_RDONLY); /* will be fd 0 (STDIN_FILENO) */
70 nohupout = "nohup.out";
71 /* Redirect stdout to nohup.out, either in "." or in "$HOME". */
72 if (isatty(STDOUT_FILENO)) {
74 if (open(nohupout, O_CREAT|O_WRONLY|O_APPEND, S_IRUSR|S_IWUSR) < 0) {
75 home = getenv("HOME");
77 nohupout = concat_path_file(home, nohupout);
78 xopen3(nohupout, O_CREAT|O_WRONLY|O_APPEND, S_IRUSR|S_IWUSR);
80 xopen(bb_dev_null, O_RDONLY); /* will be fd 1 */
83 bb_error_msg("appending output to %s", nohupout);
86 /* If we have a tty on stderr, redirect to stdout. */
87 if (isatty(STDERR_FILENO)) {
88 /* if (stdout_wasnt_a_tty)
89 bb_error_msg("redirecting stderr to stdout"); */
90 dup2(STDOUT_FILENO, STDERR_FILENO);
93 signal(SIGHUP, SIG_IGN);
96 BB_EXECVP_or_die(argv);