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82 lines
2.1 KiB
C
82 lines
2.1 KiB
C
/* vi: set sw=4 ts=4: */
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/* nohup - invoke a utility immune to hangups.
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*
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* Busybox version based on nohup specification at
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* http://www.opengroup.org/onlinepubs/007904975/utilities/nohup.html
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*
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* Copyright 2006 Rob Landley <rob@landley.net>
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* Copyright 2006 Bernhard Reutner-Fischer
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*
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* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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*/
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#include "libbb.h"
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/* Compat info: nohup (GNU coreutils 6.8) does this:
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# nohup true
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nohup: ignoring input and appending output to `nohup.out'
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# nohup true 1>/dev/null
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nohup: ignoring input and redirecting stderr to stdout
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# nohup true 2>zz
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# cat zz
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nohup: ignoring input and appending output to `nohup.out'
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# nohup true 2>zz 1>/dev/null
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# cat zz
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nohup: ignoring input
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# nohup true </dev/null 1>/dev/null
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nohup: redirecting stderr to stdout
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# nohup true </dev/null 2>zz 1>/dev/null
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# cat zz
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(nothing)
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#
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*/
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int nohup_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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int nohup_main(int argc UNUSED_PARAM, char **argv)
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{
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const char *nohupout;
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char *home;
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xfunc_error_retval = 127;
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if (!argv[1]) {
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bb_show_usage();
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}
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/* If stdin is a tty, detach from it. */
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if (isatty(STDIN_FILENO)) {
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/* bb_error_msg("ignoring input"); */
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close(STDIN_FILENO);
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xopen(bb_dev_null, O_RDONLY); /* will be fd 0 (STDIN_FILENO) */
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}
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nohupout = "nohup.out";
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/* Redirect stdout to nohup.out, either in "." or in "$HOME". */
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if (isatty(STDOUT_FILENO)) {
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close(STDOUT_FILENO);
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if (open(nohupout, O_CREAT|O_WRONLY|O_APPEND, S_IRUSR|S_IWUSR) < 0) {
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home = getenv("HOME");
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if (home) {
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nohupout = concat_path_file(home, nohupout);
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xopen3(nohupout, O_CREAT|O_WRONLY|O_APPEND, S_IRUSR|S_IWUSR);
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} else {
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xopen(bb_dev_null, O_RDONLY); /* will be fd 1 */
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}
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}
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bb_error_msg("appending output to %s", nohupout);
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}
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/* If we have a tty on stderr, redirect to stdout. */
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if (isatty(STDERR_FILENO)) {
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/* if (stdout_wasnt_a_tty)
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bb_error_msg("redirecting stderr to stdout"); */
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dup2(STDOUT_FILENO, STDERR_FILENO);
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}
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signal(SIGHUP, SIG_IGN);
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argv++;
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BB_EXECVP(argv[0], argv);
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bb_perror_msg_and_die("can't execute '%s'", argv[0]);
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}
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