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>
9 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
14 int nohup_main(int argc, char *argv[])
17 char *nohupout = "nohup.out", *home = NULL;
19 // I have no idea why the standard cares about this.
21 bb_default_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.
28 if (isatty(0)) dup2(nullfd, 0);
30 // Redirect stdout to nohup.out, either in "." or in "$HOME".
34 if (open(nohupout, O_CREAT|O_WRONLY|O_APPEND, S_IRUSR|S_IWUSR) < 0) {
35 home = getenv("HOME");
37 home = concat_path_file(home, nohupout);
38 xopen3(nohupout, O_CREAT|O_WRONLY|O_APPEND, S_IRUSR|S_IWUSR);
41 } else dup2(nullfd, 1);
43 // If we have a tty on strderr, announce filename and redirect to stdout.
44 // Else redirect to /dev/null.
47 if (temp) fdprintf(2,"Writing to %s\n", home ? home : nohupout);
48 dup2(temp ? 1 : nullfd, 2);
50 signal(SIGHUP, SIG_IGN);
52 // Exec our new program.
54 execvp(argv[1],argv+1);
55 if (ENABLE_FEATURE_CLEAN_UP) free(home);
56 bb_error_msg_and_die("exec %s",argv[1]);