1 | /* vi: set sw=4 ts=4: */
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2 | /* nohup - invoke a utility immune to hangups.
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3 | *
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4 | * Busybox version based on nohup specification at
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5 | * http://www.opengroup.org/onlinepubs/007904975/utilities/nohup.html
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6 | *
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7 | * Copyright 2006 Rob Landley <rob@landley.net>
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8 | * Copyright 2006 Bernhard Reutner-Fischer
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9 | *
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10 | * Licensed under GPLv2 or later, see file LICENSE in this source tree.
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11 | */
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12 |
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13 | //usage:#define nohup_trivial_usage
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14 | //usage: "PROG ARGS"
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15 | //usage:#define nohup_full_usage "\n\n"
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16 | //usage: "Run PROG immune to hangups, with output to a non-tty"
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17 | //usage:
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18 | //usage:#define nohup_example_usage
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19 | //usage: "$ nohup make &"
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20 |
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21 | #include "libbb.h"
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22 |
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23 | /* Compat info: nohup (GNU coreutils 6.8) does this:
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24 | # nohup true
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25 | nohup: ignoring input and appending output to `nohup.out'
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26 | # nohup true 1>/dev/null
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27 | nohup: ignoring input and redirecting stderr to stdout
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28 | # nohup true 2>zz
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29 | # cat zz
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30 | nohup: ignoring input and appending output to `nohup.out'
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31 | # nohup true 2>zz 1>/dev/null
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32 | # cat zz
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33 | nohup: ignoring input
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34 | # nohup true </dev/null 1>/dev/null
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35 | nohup: redirecting stderr to stdout
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36 | # nohup true </dev/null 2>zz 1>/dev/null
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37 | # cat zz
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38 | (nothing)
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39 | #
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40 | */
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41 |
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42 | int nohup_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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43 | int nohup_main(int argc UNUSED_PARAM, char **argv)
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44 | {
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45 | const char *nohupout;
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46 | char *home;
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47 |
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48 | xfunc_error_retval = 127;
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49 |
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50 | if (!argv[1]) {
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51 | bb_show_usage();
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52 | }
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53 |
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54 | /* If stdin is a tty, detach from it. */
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55 | if (isatty(STDIN_FILENO)) {
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56 | /* bb_error_msg("ignoring input"); */
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57 | close(STDIN_FILENO);
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58 | xopen(bb_dev_null, O_RDONLY); /* will be fd 0 (STDIN_FILENO) */
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59 | }
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60 |
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61 | nohupout = "nohup.out";
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62 | /* Redirect stdout to nohup.out, either in "." or in "$HOME". */
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63 | if (isatty(STDOUT_FILENO)) {
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64 | close(STDOUT_FILENO);
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65 | if (open(nohupout, O_CREAT|O_WRONLY|O_APPEND, S_IRUSR|S_IWUSR) < 0) {
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66 | home = getenv("HOME");
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67 | if (home) {
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68 | nohupout = concat_path_file(home, nohupout);
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69 | xopen3(nohupout, O_CREAT|O_WRONLY|O_APPEND, S_IRUSR|S_IWUSR);
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70 | } else {
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71 | xopen(bb_dev_null, O_RDONLY); /* will be fd 1 */
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72 | }
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73 | }
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74 | bb_error_msg("appending output to %s", nohupout);
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75 | }
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76 |
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77 | /* If we have a tty on stderr, redirect to stdout. */
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78 | if (isatty(STDERR_FILENO)) {
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79 | /* if (stdout_wasnt_a_tty)
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80 | bb_error_msg("redirecting stderr to stdout"); */
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81 | dup2(STDOUT_FILENO, STDERR_FILENO);
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82 | }
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83 |
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84 | signal(SIGHUP, SIG_IGN);
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85 |
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86 | argv++;
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87 | BB_EXECVP_or_die(argv);
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88 | }
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