mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-08 14:20:07 +00:00
93 lines
2.8 KiB
C
93 lines
2.8 KiB
C
/*-
|
|
* 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.
|
|
* 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.
|
|
*/
|
|
|
|
#if defined(LIBC_SCCS) && !defined(lint)
|
|
static char sccsid[] = "@(#)daemon.c 8.1 (Berkeley) 6/4/93";
|
|
#endif /* LIBC_SCCS and not lint */
|
|
|
|
#include <errno.h>
|
|
#include <fcntl.h>
|
|
#include <paths.h>
|
|
#include <unistd.h>
|
|
#include <sys/stat.h>
|
|
|
|
#include <device-nrs.h>
|
|
#include <not-cancel.h>
|
|
|
|
int
|
|
daemon (int nochdir, int noclose)
|
|
{
|
|
int fd;
|
|
|
|
switch (__fork()) {
|
|
case -1:
|
|
return (-1);
|
|
case 0:
|
|
break;
|
|
default:
|
|
_exit(0);
|
|
}
|
|
|
|
if (__setsid() == -1)
|
|
return (-1);
|
|
|
|
if (!nochdir)
|
|
(void)__chdir("/");
|
|
|
|
if (!noclose) {
|
|
struct __stat64_t64 st;
|
|
|
|
if ((fd = __open_nocancel(_PATH_DEVNULL, O_RDWR, 0)) != -1
|
|
&& __glibc_likely (__fstat64_time64 (fd, &st) == 0)) {
|
|
if (__builtin_expect (S_ISCHR (st.st_mode), 1) != 0
|
|
#if defined DEV_NULL_MAJOR && defined DEV_NULL_MINOR
|
|
&& (st.st_rdev
|
|
== makedev (DEV_NULL_MAJOR, DEV_NULL_MINOR))
|
|
#endif
|
|
) {
|
|
(void)__dup2(fd, STDIN_FILENO);
|
|
(void)__dup2(fd, STDOUT_FILENO);
|
|
(void)__dup2(fd, STDERR_FILENO);
|
|
if (fd > 2)
|
|
(void)__close (fd);
|
|
} else {
|
|
/* We must set an errno value since no
|
|
function call actually failed. */
|
|
__close_nocancel_nostatus (fd);
|
|
__set_errno (ENODEV);
|
|
return -1;
|
|
}
|
|
} else {
|
|
__close_nocancel_nostatus (fd);
|
|
return -1;
|
|
}
|
|
}
|
|
return (0);
|
|
}
|