Contents of /trunk/mkinitrd-magellan/busybox/coreutils/nohup.c
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Fri Apr 24 18:33:46 2009 UTC (15 years, 5 months ago) by niro
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Fri Apr 24 18:33:46 2009 UTC (15 years, 5 months ago) by niro
File MIME type: text/plain
File size: 2102 byte(s)
-updated to busybox-1.13.4
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 tarball for details. |
11 | */ |
12 | |
13 | #include "libbb.h" |
14 | |
15 | /* Compat info: nohup (GNU coreutils 6.8) does this: |
16 | # nohup true |
17 | nohup: ignoring input and appending output to `nohup.out' |
18 | # nohup true 1>/dev/null |
19 | nohup: ignoring input and redirecting stderr to stdout |
20 | # nohup true 2>zz |
21 | # cat zz |
22 | nohup: ignoring input and appending output to `nohup.out' |
23 | # nohup true 2>zz 1>/dev/null |
24 | # cat zz |
25 | nohup: ignoring input |
26 | # nohup true </dev/null 1>/dev/null |
27 | nohup: redirecting stderr to stdout |
28 | # nohup true </dev/null 2>zz 1>/dev/null |
29 | # cat zz |
30 | (nothing) |
31 | # |
32 | */ |
33 | |
34 | int nohup_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
35 | int nohup_main(int argc, char **argv) |
36 | { |
37 | const char *nohupout; |
38 | char *home; |
39 | |
40 | xfunc_error_retval = 127; |
41 | |
42 | if (argc < 2) bb_show_usage(); |
43 | |
44 | /* If stdin is a tty, detach from it. */ |
45 | if (isatty(STDIN_FILENO)) { |
46 | /* bb_error_msg("ignoring input"); */ |
47 | close(STDIN_FILENO); |
48 | xopen(bb_dev_null, O_RDONLY); /* will be fd 0 (STDIN_FILENO) */ |
49 | } |
50 | |
51 | nohupout = "nohup.out"; |
52 | /* Redirect stdout to nohup.out, either in "." or in "$HOME". */ |
53 | if (isatty(STDOUT_FILENO)) { |
54 | close(STDOUT_FILENO); |
55 | if (open(nohupout, O_CREAT|O_WRONLY|O_APPEND, S_IRUSR|S_IWUSR) < 0) { |
56 | home = getenv("HOME"); |
57 | if (home) { |
58 | nohupout = concat_path_file(home, nohupout); |
59 | xopen3(nohupout, O_CREAT|O_WRONLY|O_APPEND, S_IRUSR|S_IWUSR); |
60 | } else { |
61 | xopen(bb_dev_null, O_RDONLY); /* will be fd 1 */ |
62 | } |
63 | } |
64 | bb_error_msg("appending output to %s", nohupout); |
65 | } |
66 | |
67 | /* If we have a tty on stderr, redirect to stdout. */ |
68 | if (isatty(STDERR_FILENO)) { |
69 | /* if (stdout_wasnt_a_tty) |
70 | bb_error_msg("redirecting stderr to stdout"); */ |
71 | dup2(STDOUT_FILENO, STDERR_FILENO); |
72 | } |
73 | |
74 | signal(SIGHUP, SIG_IGN); |
75 | |
76 | BB_EXECVP(argv[1], argv+1); |
77 | bb_simple_perror_msg_and_die(argv[1]); |
78 | } |