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