source: branches/3.2/mindi-busybox/coreutils/nohup.c @ 3232

Last change on this file since 3232 was 3232, checked in by bruno, 5 years ago
  • Update mindi-busybox to 1.21.1
File size: 2.3 KB
Line 
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
25nohup: ignoring input and appending output to `nohup.out'
26# nohup true 1>/dev/null
27nohup: ignoring input and redirecting stderr to stdout
28# nohup true 2>zz
29# cat zz
30nohup: ignoring input and appending output to `nohup.out'
31# nohup true 2>zz 1>/dev/null
32# cat zz
33nohup: ignoring input
34# nohup true </dev/null 1>/dev/null
35nohup: redirecting stderr to stdout
36# nohup true </dev/null 2>zz 1>/dev/null
37# cat zz
38  (nothing)
39#
40*/
41
42int nohup_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
43int 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}
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