2 * Copyright (c) 1990, 1993
3 * The Regents of the University of California. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 4. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 #if defined(LIBC_SCCS) && !defined(lint)
31 static char sccsid
[] = "@(#)daemon.c 8.1 (Berkeley) 6/4/93";
32 #endif /* LIBC_SCCS and not lint */
40 #include <device-nrs.h>
41 #include <not-cancel.h>
44 daemon (int nochdir
, int noclose
)
66 if ((fd
= open_not_cancel(_PATH_DEVNULL
, O_RDWR
, 0)) != -1
67 && (__builtin_expect (__fxstat64 (_STAT_VER
, fd
, &st
), 0)
69 if (__builtin_expect (S_ISCHR (st
.st_mode
), 1) != 0
70 #if defined DEV_NULL_MAJOR && defined DEV_NULL_MINOR
72 == makedev (DEV_NULL_MAJOR
, DEV_NULL_MINOR
))
75 (void)__dup2(fd
, STDIN_FILENO
);
76 (void)__dup2(fd
, STDOUT_FILENO
);
77 (void)__dup2(fd
, STDERR_FILENO
);
81 /* We must set an errno value since no
82 function call actually failed. */
83 close_not_cancel_no_status (fd
);
88 close_not_cancel_no_status (fd
);