| /* 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, |
| int argc, char **argv, char *foreground_opt) |
| { |
| int fd; |
| char **vfork_args; |
| int a = 0; |
| |
| setsid(); |
| |
| if (!nochdir) |
| xchdir("/"); |
| |
| if (!noclose && (fd = open(bb_dev_null, O_RDWR, 0)) != -1) { |
| dup2(fd, STDIN_FILENO); |
| dup2(fd, STDOUT_FILENO); |
| dup2(fd, STDERR_FILENO); |
| while (fd > 2) |
| close(fd--); |
| } |
| |
| vfork_args = xzalloc(sizeof(char *) * (argc + 3)); |
| vfork_args[a++] = CONFIG_BUSYBOX_EXEC_PATH; |
| 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 */ |