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Get vfork_daemon_rexec working under uclinux

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Russ Dill
2003-12-15 21:57:44 +00:00
parent d4f7a5edad
commit a1fece2c70
5 changed files with 72 additions and 20 deletions
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63
libbb/vfork_daemon_rexec.c
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@@ -1,27 +1,78 @@
/*
* Rexec program for system have fork() as vfork() with foregound option
* Copyright (C) Vladminr Oleynik and many different people.
*
* 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>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <unistd.h>
#include <stdio.h>
#include <fcntl.h>
#include <paths.h>
#include "libbb.h"
#if defined(__uClinux__)
void vfork_daemon_rexec(int argc, char **argv, char *foreground_opt)
void vfork_daemon_rexec(int nochdir, int noclose,
int argc, char **argv, char *foreground_opt)
{
int fd;
char **vfork_args;
int a = 0;
setsid();
if (!nochdir)
chdir("/");
if (!noclose && (fd = open(_PATH_DEVNULL, O_RDWR, 0)) != -1) {
dup2(fd, STDIN_FILENO);
dup2(fd, STDOUT_FILENO);
dup2(fd, STDERR_FILENO);
if (fd > 2)
close(fd);
}
vfork_args = xcalloc(sizeof(char *), argc + 3);
vfork_args[a++] = "/bin/busybox";
while(*argv) {
vfork_args[a++] = *argv;
argv++;
}
vfork_args[a] = foreground_opt;
execvp("/proc/self/exe", vfork_args);
vfork_args[0] = "/bin/busybox";
execv(vfork_args[0], vfork_args);
bb_perror_msg_and_die("execv %s", vfork_args[0]);
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 /* uClinux */