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.
17 int nohup_main(int argc, char *argv[])
20 char *nohupout = "nohup.out", *home = NULL;
22 // I have no idea why the standard cares about this.
24 bb_default_error_retval = 127;
26 if (argc<2) bb_show_usage();
28 nullfd = bb_xopen(bb_dev_null, O_WRONLY|O_APPEND);
29 // If stdin is a tty, detach from it.
31 if (isatty(0)) dup2(nullfd, 0);
33 // Redirect stdout to nohup.out, either in "." or in "$HOME".
37 if (open(nohupout, O_CREAT|O_WRONLY|O_APPEND, S_IRUSR|S_IWUSR) < 0) {
38 home = getenv("HOME");
40 home = concat_path_file(home, nohupout);
41 bb_xopen3(nohupout, O_CREAT|O_WRONLY|O_APPEND, S_IRUSR|S_IWUSR);
44 } else dup2(nullfd, 1);
46 // If we have a tty on strderr, announce filename and redirect to stdout.
47 // Else redirect to /dev/null.
50 if (temp) fdprintf(2,"Writing to %s\n", home ? home : nohupout);
51 dup2(temp ? 1 : nullfd, 2);
53 signal (SIGHUP, SIG_IGN);
55 // Exec our new program.
57 execvp(argv[1],argv+1);
58 if (ENABLE_FEATURE_CLEAN_UP) free(home);
59 bb_error_msg_and_die("exec %s",argv[1]);