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    Annotation of /trunk/mkinitrd-magellan/busybox/coreutils/nohup.c

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    Revision 984 - (hide annotations) (download)
    Sun May 30 11:32:42 2010 UTC (13 years, 11 months ago) by niro
    File MIME type: text/plain
    File size: 2122 byte(s) 
    -updated to busybox-1.16.1 and enabled blkid/uuid support in default config
    1 niro 532 /* 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 niro 816 * Copyright 2006 Bernhard Reutner-Fischer
    9 niro 532 *
    10     * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
    11     */
    12    
    13 niro 816 #include "libbb.h"
    14 niro 532
    15 niro 816 /* 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 niro 984 int nohup_main(int argc UNUSED_PARAM, char **argv)
    36 niro 532 {
    37 niro 816 const char *nohupout;
    38     char *home;
    39 niro 532
    40     xfunc_error_retval = 127;
    41    
    42 niro 984 if (!argv[1]) {
    43     bb_show_usage();
    44     }
    45 niro 532
    46     /* If stdin is a tty, detach from it. */
    47 niro 816 if (isatty(STDIN_FILENO)) {
    48     /* bb_error_msg("ignoring input"); */
    49     close(STDIN_FILENO);
    50     xopen(bb_dev_null, O_RDONLY); /* will be fd 0 (STDIN_FILENO) */
    51     }
    52 niro 532
    53     nohupout = "nohup.out";
    54     /* Redirect stdout to nohup.out, either in "." or in "$HOME". */
    55     if (isatty(STDOUT_FILENO)) {
    56     close(STDOUT_FILENO);
    57     if (open(nohupout, O_CREAT|O_WRONLY|O_APPEND, S_IRUSR|S_IWUSR) < 0) {
    58     home = getenv("HOME");
    59     if (home) {
    60     nohupout = concat_path_file(home, nohupout);
    61     xopen3(nohupout, O_CREAT|O_WRONLY|O_APPEND, S_IRUSR|S_IWUSR);
    62 niro 816 } else {
    63     xopen(bb_dev_null, O_RDONLY); /* will be fd 1 */
    64 niro 532 }
    65     }
    66 niro 816 bb_error_msg("appending output to %s", nohupout);
    67     }
    68 niro 532
    69 niro 816 /* If we have a tty on stderr, redirect to stdout. */
    70     if (isatty(STDERR_FILENO)) {
    71     /* if (stdout_wasnt_a_tty)
    72     bb_error_msg("redirecting stderr to stdout"); */
    73     dup2(STDOUT_FILENO, STDERR_FILENO);
    74     }
    75 niro 532
    76 niro 816 signal(SIGHUP, SIG_IGN);
    77    
    78     BB_EXECVP(argv[1], argv+1);
    79     bb_simple_perror_msg_and_die(argv[1]);
    80 niro 532 }