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 Fischer
10 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
15 int nohup_main(int argc, char **argv)
21 xfunc_error_retval = 127;
23 if (argc < 2) bb_show_usage();
25 nullfd = xopen(bb_dev_null, O_WRONLY|O_APPEND);
26 /* If stdin is a tty, detach from it. */
27 if (isatty(STDIN_FILENO))
28 dup2(nullfd, STDIN_FILENO);
30 nohupout = "nohup.out";
31 /* Redirect stdout to nohup.out, either in "." or in "$HOME". */
32 if (isatty(STDOUT_FILENO)) {
34 if (open(nohupout, O_CREAT|O_WRONLY|O_APPEND, S_IRUSR|S_IWUSR) < 0) {
35 home = getenv("HOME");
37 nohupout = concat_path_file(home, nohupout);
38 xopen3(nohupout, O_CREAT|O_WRONLY|O_APPEND, S_IRUSR|S_IWUSR);
41 } else dup2(nullfd, STDOUT_FILENO);
43 /* If we have a tty on stderr, announce filename and redirect to stdout.
44 * Else redirect to /dev/null.
46 if (isatty(STDERR_FILENO)) {
47 bb_error_msg("appending to %s", nohupout);
48 dup2(STDOUT_FILENO, STDERR_FILENO);
49 } else dup2(nullfd, STDERR_FILENO);
53 signal(SIGHUP, SIG_IGN);
55 execvp(argv[1], argv+1);
56 if (ENABLE_FEATURE_CLEAN_UP && home)
57 free((char*)nohupout);
58 bb_perror_msg_and_die("%s", argv[1]);