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93 lines
2.8 KiB
C
93 lines
2.8 KiB
C
/*-
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* Copyright (c) 1990, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#if defined(LIBC_SCCS) && !defined(lint)
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static char sccsid[] = "@(#)daemon.c 8.1 (Berkeley) 6/4/93";
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#endif /* LIBC_SCCS and not lint */
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#include <errno.h>
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#include <fcntl.h>
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#include <paths.h>
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#include <unistd.h>
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#include <sys/stat.h>
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#include <device-nrs.h>
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#include <not-cancel.h>
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int
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daemon (int nochdir, int noclose)
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{
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int fd;
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switch (__fork()) {
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case -1:
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return (-1);
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case 0:
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break;
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default:
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_exit(0);
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}
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if (__setsid() == -1)
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return (-1);
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if (!nochdir)
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(void)__chdir("/");
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if (!noclose) {
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struct __stat64_t64 st;
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if ((fd = __open_nocancel(_PATH_DEVNULL, O_RDWR, 0)) != -1
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&& __glibc_likely (__fstat64_time64 (fd, &st) == 0)) {
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if (__builtin_expect (S_ISCHR (st.st_mode), 1) != 0
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#if defined DEV_NULL_MAJOR && defined DEV_NULL_MINOR
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&& (st.st_rdev
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== makedev (DEV_NULL_MAJOR, DEV_NULL_MINOR))
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#endif
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) {
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(void)__dup2(fd, STDIN_FILENO);
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(void)__dup2(fd, STDOUT_FILENO);
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(void)__dup2(fd, STDERR_FILENO);
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if (fd > 2)
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(void)__close (fd);
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} else {
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/* We must set an errno value since no
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function call actually failed. */
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__close_nocancel_nostatus (fd);
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__set_errno (ENODEV);
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return -1;
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}
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} else {
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__close_nocancel_nostatus (fd);
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return -1;
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}
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}
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return (0);
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}
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