mirror of
https://github.com/sheumann/hush.git
synced 2024-07-18 03:29:00 +00:00
9067f13be0
option for every affected applet (and dnsd, for example, don't have one). Thus rework re-exec support to not require it. Code got smaller too.
59 lines
1.4 KiB
C
59 lines
1.4 KiB
C
/* vi: set sw=4 ts=4: */
|
|
/*
|
|
* Rexec program for system have fork() as vfork() with foreground option
|
|
*
|
|
* Copyright (C) Vladimir N. Oleynik <dzo@simtreas.ru>
|
|
* Copyright (C) 2003 Russ Dill <Russ.Dill@asu.edu>
|
|
*
|
|
* daemon() portion taken from uClibc:
|
|
*
|
|
* Copyright (c) 1991, 1993
|
|
* The Regents of the University of California. All rights reserved.
|
|
*
|
|
* Modified for uClibc by Erik Andersen <andersee@debian.org>
|
|
*
|
|
* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
|
|
*/
|
|
|
|
#include <paths.h>
|
|
#include "libbb.h"
|
|
|
|
#ifdef BB_NOMMU
|
|
void vfork_daemon_rexec(int nochdir, int noclose, char **argv)
|
|
{
|
|
int fd;
|
|
|
|
setsid();
|
|
|
|
if (!nochdir)
|
|
xchdir("/");
|
|
|
|
if (!noclose) {
|
|
/* if "/dev/null" doesn't exist, bail out! */
|
|
fd = xopen(bb_dev_null, O_RDWR);
|
|
dup2(fd, STDIN_FILENO);
|
|
dup2(fd, STDOUT_FILENO);
|
|
dup2(fd, STDERR_FILENO);
|
|
while (fd > 2)
|
|
close(fd--);
|
|
}
|
|
|
|
switch (vfork()) {
|
|
case 0: /* child */
|
|
/* Make certain we are not a session leader, or else we
|
|
* might reacquire a controlling terminal */
|
|
if (vfork())
|
|
_exit(0);
|
|
/* High-order bit of first char in argv[0] is a hidden
|
|
* "we have (alrealy) re-execed, don't do it again" flag */
|
|
argv[0][0] |= 0x80;
|
|
execv(CONFIG_BUSYBOX_EXEC_PATH, argv);
|
|
bb_perror_msg_and_die("exec %s", CONFIG_BUSYBOX_EXEC_PATH);
|
|
case -1: /* error */
|
|
bb_perror_msg_and_die("vfork");
|
|
default: /* parent */
|
|
exit(0);
|
|
}
|
|
}
|
|
#endif /* BB_NOMMU */
|