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    Contents of /tags/mkinitrd-6_1_5/busybox/coreutils/nohup.c

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    Revision 899 - (show annotations) (download)
    Wed Aug 5 17:52:52 2009 UTC (14 years, 10 months ago) by niro
    File MIME type: text/plain
    File size: 2102 byte(s) 
    tagged 'mkinitrd-6_1_5'
    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 }