blob: 63853fd550087b27d40e0fdfb827fb7eac0e7681
1 | /* vi: set sw=4 ts=4: */ |
2 | /* nohup - invoke a utility immune to hangups. |
3 | * |
4 | * Busybox version based on nohup specification at |
5 | * http://www.opengroup.org/onlinepubs/007904975/utilities/nohup.html |
6 | * |
7 | * Copyright 2006 Rob Landley <rob@landley.net> |
8 | * Copyright 2006 Bernhard Reutner-Fischer |
9 | * |
10 | * Licensed under GPLv2 or later, see file LICENSE in this source tree. |
11 | */ |
12 | |
13 | //usage:#define nohup_trivial_usage |
14 | //usage: "PROG ARGS" |
15 | //usage:#define nohup_full_usage "\n\n" |
16 | //usage: "Run PROG immune to hangups, with output to a non-tty" |
17 | //usage: |
18 | //usage:#define nohup_example_usage |
19 | //usage: "$ nohup make &" |
20 | |
21 | #include "libbb.h" |
22 | |
23 | /* Compat info: nohup (GNU coreutils 6.8) does this: |
24 | # nohup true |
25 | nohup: ignoring input and appending output to `nohup.out' |
26 | # nohup true 1>/dev/null |
27 | nohup: ignoring input and redirecting stderr to stdout |
28 | # nohup true 2>zz |
29 | # cat zz |
30 | nohup: ignoring input and appending output to `nohup.out' |
31 | # nohup true 2>zz 1>/dev/null |
32 | # cat zz |
33 | nohup: ignoring input |
34 | # nohup true </dev/null 1>/dev/null |
35 | nohup: redirecting stderr to stdout |
36 | # nohup true </dev/null 2>zz 1>/dev/null |
37 | # cat zz |
38 | (nothing) |
39 | # |
40 | */ |
41 | |
42 | int nohup_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
43 | int nohup_main(int argc UNUSED_PARAM, char **argv) |
44 | { |
45 | const char *nohupout; |
46 | char *home; |
47 | |
48 | xfunc_error_retval = 127; |
49 | |
50 | if (!argv[1]) { |
51 | bb_show_usage(); |
52 | } |
53 | |
54 | /* If stdin is a tty, detach from it. */ |
55 | if (isatty(STDIN_FILENO)) { |
56 | /* bb_error_msg("ignoring input"); */ |
57 | close(STDIN_FILENO); |
58 | xopen(bb_dev_null, O_RDONLY); /* will be fd 0 (STDIN_FILENO) */ |
59 | } |
60 | |
61 | nohupout = "nohup.out"; |
62 | /* Redirect stdout to nohup.out, either in "." or in "$HOME". */ |
63 | if (isatty(STDOUT_FILENO)) { |
64 | close(STDOUT_FILENO); |
65 | if (open(nohupout, O_CREAT|O_WRONLY|O_APPEND, S_IRUSR|S_IWUSR) < 0) { |
66 | home = getenv("HOME"); |
67 | if (home) { |
68 | nohupout = concat_path_file(home, nohupout); |
69 | xopen3(nohupout, O_CREAT|O_WRONLY|O_APPEND, S_IRUSR|S_IWUSR); |
70 | } else { |
71 | xopen(bb_dev_null, O_RDONLY); /* will be fd 1 */ |
72 | } |
73 | } |
74 | bb_error_msg("appending output to %s", nohupout); |
75 | } |
76 | |
77 | /* If we have a tty on stderr, redirect to stdout. */ |
78 | if (isatty(STDERR_FILENO)) { |
79 | /* if (stdout_wasnt_a_tty) |
80 | bb_error_msg("redirecting stderr to stdout"); */ |
81 | dup2(STDOUT_FILENO, STDERR_FILENO); |
82 | } |
83 | |
84 | signal(SIGHUP, SIG_IGN); |
85 | |
86 | argv++; |
87 | BB_EXECVP_or_die(argv); |
88 | } |
89 |