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60 lines
1.5 KiB
C
60 lines
1.5 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 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 "busybox.h"
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int nohup_main(int argc, char **argv)
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{
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int nullfd;
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const char *nohupout;
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char *home = NULL;
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xfunc_error_retval = 127;
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if (argc < 2) bb_show_usage();
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nullfd = xopen(bb_dev_null, O_WRONLY|O_APPEND);
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/* If stdin is a tty, detach from it. */
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if (isatty(STDIN_FILENO))
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dup2(nullfd, STDIN_FILENO);
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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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}
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}
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} else dup2(nullfd, STDOUT_FILENO);
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/* If we have a tty on stderr, announce filename and redirect to stdout.
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* Else redirect to /dev/null.
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*/
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if (isatty(STDERR_FILENO)) {
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bb_error_msg("appending to %s", nohupout);
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dup2(STDOUT_FILENO, STDERR_FILENO);
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} else dup2(nullfd, STDERR_FILENO);
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if (nullfd > 2)
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close(nullfd);
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signal(SIGHUP, SIG_IGN);
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execvp(argv[1], argv+1);
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if (ENABLE_FEATURE_CLEAN_UP && home)
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free((char*)nohupout);
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bb_perror_msg_and_die("%s", argv[1]);
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}
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