mirror of
https://github.com/sheumann/hush.git
synced 2024-12-22 14:30:31 +00:00
61 lines
1.5 KiB
C
61 lines
1.5 KiB
C
/* vi:set ts=4: */
|
|
/* nohup - invoke a utility immune to hangups.
|
|
*
|
|
* Busybox version based on nohup specification at
|
|
* http://www.opengroup.org/onlinepubs/007904975/utilities/nohup.html
|
|
*
|
|
* Copyright 2006 Rob Landley <rob@landley.net>
|
|
*
|
|
* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
|
|
*/
|
|
|
|
#include <fcntl.h>
|
|
#include <signal.h>
|
|
#include <unistd.h>
|
|
#include "busybox.h"
|
|
|
|
int nohup_main(int argc, char *argv[])
|
|
{
|
|
int temp, nullfd;
|
|
char *nohupout = "nohup.out", *home = NULL;
|
|
|
|
// I have no idea why the standard cares about this.
|
|
|
|
bb_default_error_retval = 127;
|
|
|
|
if (argc<2) bb_show_usage();
|
|
|
|
nullfd = bb_xopen(bb_dev_null, O_WRONLY|O_APPEND);
|
|
// If stdin is a tty, detach from it.
|
|
|
|
if (isatty(0)) dup2(nullfd, 0);
|
|
|
|
// Redirect stdout to nohup.out, either in "." or in "$HOME".
|
|
|
|
if (isatty(1)) {
|
|
close(1);
|
|
if (open(nohupout, O_CREAT|O_WRONLY|O_APPEND, S_IRUSR|S_IWUSR) < 0) {
|
|
home = getenv("HOME");
|
|
if (home) {
|
|
home = concat_path_file(home, nohupout);
|
|
bb_xopen3(nohupout, O_CREAT|O_WRONLY|O_APPEND, S_IRUSR|S_IWUSR);
|
|
}
|
|
}
|
|
} else dup2(nullfd, 1);
|
|
|
|
// If we have a tty on strderr, announce filename and redirect to stdout.
|
|
// Else redirect to /dev/null.
|
|
|
|
temp = isatty(2);
|
|
if (temp) fdprintf(2,"Writing to %s\n", home ? home : nohupout);
|
|
dup2(temp ? 1 : nullfd, 2);
|
|
close(nullfd);
|
|
signal (SIGHUP, SIG_IGN);
|
|
|
|
// Exec our new program.
|
|
|
|
execvp(argv[1],argv+1);
|
|
if (ENABLE_FEATURE_CLEAN_UP) free(home);
|
|
bb_error_msg_and_die("exec %s",argv[1]);
|
|
}
|