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/* 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 <unistd.h>
#include <stdio.h>
#include <fcntl.h>
#include <paths.h>
#include "libbb.h"
#ifdef BB_NOMMU
static void vfork_daemon_common(int nochdir, int noclose)
{
int fd;
setsid();
if (!nochdir)
chdir("/");
if (!noclose && (fd = open(bb_dev_null, O_RDWR, 0)) != -1) {
dup2(fd, STDIN_FILENO);
dup2(fd, STDOUT_FILENO);
dup2(fd, STDERR_FILENO);
if (fd > 2)
close(fd);
}
}
void vfork_daemon(int nochdir, int noclose)
{
vfork_daemon_common(nochdir, noclose);
if (vfork())
exit(0);
}
void vfork_daemon_rexec(int nochdir, int noclose,
int argc, char **argv, char *foreground_opt)
{
char **vfork_args;
int a = 0;
vfork_daemon_common(nochdir, noclose);
vfork_args = xcalloc(sizeof(char *), argc + 3);
vfork_args[a++] = "/bin/busybox";
while(*argv) {
vfork_args[a++] = *argv;
argv++;
}
vfork_args[a] = foreground_opt;
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);
execv(vfork_args[0], vfork_args);
bb_perror_msg_and_die("execv %s", vfork_args[0]);
case -1: /* error */
bb_perror_msg_and_die("vfork");
default: /* parent */
exit(0);
}
}
#endif /* BB_NOMMU */
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