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- /* daemon implementation for uClibc
- *
- * Copyright (c) 1990, 1993
- * The Regents of the University of California. All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- *
- * 3. <BSD Advertising Clause omitted per the July 22, 1999 licensing change
- * ftp://ftp.cs.berkeley.edu/pub/4bsd/README.Impt.License.Change>
- *
- * 4. Neither the name of the University nor the names of its contributors
- * may be used to endorse or promote products derived from this software
- * without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- */
- /*
- * Copyright (C) 2000-2006 Erik Andersen <andersen@uclibc.org>
- *
- * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
- * Modified for uClibc by Erik Andersen <andersen@uclibc.org>
- */
- #include <stdio.h>
- #include <features.h>
- #include <fcntl.h>
- #include <paths.h>
- #include <signal.h>
- #include <unistd.h>
- #include <not-cancel.h>
- #include <errno.h>
- #ifdef __UCLIBC_HAS_THREADS_NATIVE__
- #include <sys/stat.h>
- #endif
- #define STAT stat64
- #define FSTAT fstat64
- #if defined __USE_BSD || (defined __USE_XOPEN && !defined __USE_UNIX98)
- #ifndef __ARCH_USE_MMU__
- #include <sys/syscall.h>
- #include <sched.h>
- /* use clone() to get fork() like behavior here -- we just want to disassociate
- * from the controlling terminal
- */
- pid_t _fork_parent(void)
- {
- INTERNAL_SYSCALL_DECL(err);
- register long ret = INTERNAL_SYSCALL(clone, err, 2, CLONE_VM, 0);
- if (ret > 0)
- /* parent needs to die now w/out touching stack */
- INTERNAL_SYSCALL(exit, err, 1, 0);
- return ret;
- }
- static inline pid_t fork_parent(void)
- {
- /* Block all signals to keep the parent from using the stack */
- pid_t ret;
- sigset_t new_set, old_set;
- sigfillset(&new_set);
- sigprocmask(SIG_BLOCK, &new_set, &old_set);
- ret = _fork_parent();
- sigprocmask(SIG_SETMASK, &old_set, NULL);
- return ret;
- }
- #else
- static inline pid_t fork_parent(void)
- {
- switch (fork()) {
- case -1: return -1;
- case 0: return 0;
- default: _exit(0);
- }
- }
- #endif
- int daemon(int nochdir, int noclose)
- {
- int fd;
- if (fork_parent() == -1)
- return -1;
- if (setsid() == -1)
- return -1;
- if (!nochdir)
- chdir("/");
- if (!noclose)
- {
- struct STAT st;
- if ((fd = open_not_cancel_2(_PATH_DEVNULL, O_RDWR)) != -1
- && (__builtin_expect (FSTAT (fd, &st), 0) == 0))
- {
- if (__builtin_expect (S_ISCHR (st.st_mode), 1) != 0) {
- dup2(fd, STDIN_FILENO);
- dup2(fd, STDOUT_FILENO);
- dup2(fd, STDERR_FILENO);
- if (fd > 2)
- close(fd);
- } else {
- /* We must set an errno value since no
- function call actually failed. */
- close_not_cancel_no_status (fd);
- __set_errno (ENODEV);
- return -1;
- }
- } else {
- close_not_cancel_no_status (fd);
- return -1;
- }
- }
- return 0;
- }
- #endif
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