1 /* vi: set sw=4 ts=4: */
2 /* daemon implementation for uClibc
4 * Copyright (c) 1990, 1993
5 * The Regents of the University of California. All rights reserved.
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
16 * 3. <BSD Advertising Clause omitted per the July 22, 1999 licensing change
17 * ftp://ftp.cs.berkeley.edu/pub/4bsd/README.Impt.License.Change>
19 * 4. Neither the name of the University nor the names of its contributors
20 * may be used to endorse or promote products derived from this software
21 * without specific prior written permission.
23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
37 * Copyright (C) 2000-2006 Erik Andersen <andersen@uclibc.org>
39 * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
40 * Modified for uClibc by Erik Andersen <andersen@uclibc.org>
49 #include <not-cancel.h>
52 #ifdef __UCLIBC_HAS_THREADS_NATIVE__
56 #ifdef __UCLIBC_HAS_LFS__
64 #if defined __USE_BSD || (defined __USE_XOPEN && !defined __USE_UNIX98)
66 #ifndef __ARCH_USE_MMU__
67 #include <sys/syscall.h>
69 /* use clone() to get fork() like behavior here -- we just want to disassociate
70 * from the controlling terminal
72 static inline attribute_optimize("O3")
73 pid_t _fork_parent(void)
75 INTERNAL_SYSCALL_DECL(err);
76 register long ret = INTERNAL_SYSCALL(clone, err, 2, CLONE_VM, 0);
78 /* parent needs to die now w/out touching stack */
79 INTERNAL_SYSCALL(exit, err, 1, 0);
82 static inline pid_t fork_parent(void)
84 /* Block all signals to keep the parent from using the stack */
86 sigset_t new_set, old_set;
88 sigprocmask(SIG_BLOCK, &new_set, &old_set);
90 sigprocmask(SIG_SETMASK, &old_set, NULL);
94 static inline pid_t fork_parent(void)
104 int daemon(int nochdir, int noclose)
108 if (fork_parent() == -1)
121 if ((fd = open_not_cancel_2(_PATH_DEVNULL, O_RDWR)) != -1
122 && (__builtin_expect (FSTAT (fd, &st), 0) == 0))
124 if (__builtin_expect (S_ISCHR (st.st_mode), 1) != 0) {
125 dup2(fd, STDIN_FILENO);
126 dup2(fd, STDOUT_FILENO);
127 dup2(fd, STDERR_FILENO);
131 /* We must set an errno value since no
132 function call actually failed. */
133 close_not_cancel_no_status (fd);
134 __set_errno (ENODEV);
138 close_not_cancel_no_status (fd);