8b2b22e84d
by a parent that is a session leader (e.g., login shell) by ignoring SIGHUP in before calling fork(2) and then restoring SIGHUP's action after setsid(3). Based on the patch by Martin Kammerhofer <mkamm@gmx.net>. PR: bin/25462 Reviewed by: bde, alex.neyman@auriga.ru
95 lines
2.9 KiB
C
95 lines
2.9 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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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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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 <sys/cdefs.h>
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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 <signal.h>
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#include <unistd.h>
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#include "un-namespace.h"
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int
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daemon(nochdir, noclose)
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int nochdir, noclose;
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{
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struct sigaction osa, sa;
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int fd;
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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 = _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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_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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_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 (!nochdir)
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(void)chdir("/");
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if (!noclose && (fd = _open(_PATH_DEVNULL, O_RDWR, 0)) != -1) {
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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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}
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return (0);
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}
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