c1920558b3
- Move CSRG IDs into __SCCSID(). - When a file has been copied, consistently use 'From: <tag>' for strings referencing the version of the source file copied from in the license block comment. - Some of the 'From:' tags were using $FreeBSD$ that was being expanded on each checkout. Fix those to hardcode the FreeBSD tag from the file that was copied at the time of the copy. - When multiple strings are present list them in "chronological" order, so CSRG (__SCCSID) before FreeBSD (__FBSDID). If a file came from OtherBSD and contains a CSRG ID from the OtherBSD file, use the order CSRG -> OtherBSD -> FreeBSD. Reviewed by: imp Differential Revision: https://reviews.freebsd.org/D15831
120 lines
3.1 KiB
C
120 lines
3.1 KiB
C
/*-
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* SPDX-License-Identifier: BSD-3-Clause
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*
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* Copyright (c) 1990, 1993 The Regents of the University of California.
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* Copyright (c) 2017 Mariusz Zaborski <oshogbo@FreeBSD.org>
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* 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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* 3. 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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#include <sys/cdefs.h>
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__SCCSID("@(#)daemon.c 8.1 (Berkeley) 6/4/93");
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__FBSDID("$FreeBSD$");
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#include "namespace.h"
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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 <stdlib.h>
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#include <signal.h>
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#include <unistd.h>
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#include "un-namespace.h"
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#include "libc_private.h"
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int
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daemonfd(int chdirfd, int nullfd)
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{
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struct sigaction osa, sa;
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pid_t newgrp;
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int oerrno;
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int osa_ok;
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/* A SIGHUP may be thrown when the parent exits below. */
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sigemptyset(&sa.sa_mask);
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sa.sa_handler = SIG_IGN;
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sa.sa_flags = 0;
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osa_ok = __libc_sigaction(SIGHUP, &sa, &osa);
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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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/*
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* A fine point: _exit(0), not exit(0), to avoid triggering
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* atexit(3) processing
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*/
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_exit(0);
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}
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newgrp = setsid();
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oerrno = errno;
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if (osa_ok != -1)
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__libc_sigaction(SIGHUP, &osa, NULL);
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if (newgrp == -1) {
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errno = oerrno;
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return (-1);
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}
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if (chdirfd != -1)
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(void)fchdir(chdirfd);
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if (nullfd != -1) {
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(void)_dup2(nullfd, STDIN_FILENO);
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(void)_dup2(nullfd, STDOUT_FILENO);
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(void)_dup2(nullfd, STDERR_FILENO);
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}
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return (0);
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}
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int
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daemon(int nochdir, int noclose)
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{
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int chdirfd, nullfd, ret;
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if (!noclose)
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nullfd = _open(_PATH_DEVNULL, O_RDWR, 0);
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else
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nullfd = -1;
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if (!nochdir)
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chdirfd = _open("/", O_EXEC);
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else
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chdirfd = -1;
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ret = daemonfd(chdirfd, nullfd);
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if (chdirfd != -1)
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_close(chdirfd);
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if (nullfd > 2)
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_close(nullfd);
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return (ret);
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}
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