268 lines
7.7 KiB
C
268 lines
7.7 KiB
C
#if !defined(lint) && !defined(SABER)
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static const char sccsid[] = "@(#)ns_main.c 4.55 (Berkeley) 7/1/91";
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static const char rcsid[] = "$Id: ns_signal.c,v 8.13 2000/07/11 07:10:12 vixie Exp $";
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#endif /* not lint */
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/*
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* Copyright (c) 1986, 1989, 1990
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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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/*
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* Portions Copyright (c) 1993 by Digital Equipment Corporation.
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies, and that
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* the name of Digital Equipment Corporation not be used in advertising or
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* publicity pertaining to distribution of the document or software without
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* specific, written prior permission.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL
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* WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT
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* CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
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* DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
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* PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
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* ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
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* SOFTWARE.
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*/
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/*
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* Portions Copyright (c) 1996-2000 by Internet Software Consortium.
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
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* ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
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* CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
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* DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
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* PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
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* ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
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* SOFTWARE.
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*/
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/* Import. */
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#include "port_before.h"
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#include <sys/types.h>
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#include <sys/param.h>
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#include <sys/file.h>
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#include <sys/stat.h>
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#include <sys/wait.h>
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#include <sys/ioctl.h>
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#include <sys/socket.h>
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#ifdef SVR4 /* XXX */
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# include <sys/sockio.h>
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#else
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# include <sys/mbuf.h>
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#endif
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#include <netinet/in.h>
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#include <net/route.h>
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#include <net/if.h>
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#include <arpa/nameser.h>
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#include <arpa/inet.h>
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#include <ctype.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <grp.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <signal.h>
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#include <netdb.h>
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#include <pwd.h>
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#include <resolv.h>
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#include <string.h>
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#include <syslog.h>
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#include <time.h>
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#include <unistd.h>
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#include <isc/eventlib.h>
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#include <isc/logging.h>
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#include <isc/memcluster.h>
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#include <isc/list.h>
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#include "port_after.h"
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#include "named.h"
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/* Forward. */
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static SIG_FN onhup(int);
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static SIG_FN onintr(int);
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static SIG_FN setdumpflg(int);
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static SIG_FN setIncrDbgFlg(int);
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static SIG_FN setNoDbgFlg(int);
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static SIG_FN setQrylogFlg(int);
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static SIG_FN setstatsflg(int);
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static SIG_FN discard_pipe(int);
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static SIG_FN setreapflg(int);
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/* Data. */
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static struct {
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int sig;
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SIG_FN (*hand)(int);
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} sighandlers[] = {
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#ifdef DEBUG
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{ SIGUSR1, setIncrDbgFlg },
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{ SIGUSR2, setNoDbgFlg },
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#endif
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#if defined(SIGWINCH) && defined(QRYLOG)
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{ SIGWINCH, setQrylogFlg },
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#endif
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#if defined(SIGXFSZ)
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{ SIGXFSZ, onhup }, /* Wierd DEC Hesiodism, harmless. */
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#endif
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{ SIGINT, setdumpflg },
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{ SIGILL, setstatsflg },
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{ SIGHUP, onhup },
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{ SIGCHLD, setreapflg },
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{ SIGPIPE, discard_pipe },
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{ SIGTERM, onintr }
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};
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static sigset_t mask;
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static int blocked = 0;
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/* Private. */
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static SIG_FN
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onhup(int sig) {
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ns_need_unsafe(main_need_reload);
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}
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static SIG_FN
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onintr(int sig) {
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ns_need_unsafe(main_need_exit);
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}
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static SIG_FN
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setdumpflg(int sig) {
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ns_need_unsafe(main_need_dump);
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}
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#ifdef DEBUG
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static SIG_FN
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setIncrDbgFlg(int sig) {
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desired_debug++;
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ns_need_unsafe(main_need_debug);
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}
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static SIG_FN
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setNoDbgFlg(int sig) {
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desired_debug = 0;
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ns_need_unsafe(main_need_debug);
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}
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#endif /*DEBUG*/
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#if defined(QRYLOG) && defined(SIGWINCH)
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static SIG_FN
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setQrylogFlg(int sig) {
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ns_need_unsafe(main_need_qrylog);
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}
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#endif /*QRYLOG && SIGWINCH*/
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static SIG_FN
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setstatsflg(int sig) {
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ns_need_unsafe(main_need_statsdump);
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}
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static SIG_FN
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discard_pipe(int sig) {
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#ifdef SIGPIPE_ONE_SHOT
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int saved_errno = errno;
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struct sigaction sa;
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memset(&sa, 0, sizeof sa);
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sa.sa_mask = mask;
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sa.sa_handler = discard_pipe;
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if (sigaction(SIGPIPE, &sa, NULL) < 0)
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ns_error(ns_log_os, "sigaction failed in discard_pipe: %s",
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strerror(errno));
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errno = saved_errno;
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#endif
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}
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static SIG_FN
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setreapflg(int sig) {
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ns_need_unsafe(main_need_reap);
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}
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/* Public. */
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void
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init_signals(void) {
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int sh;
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/* The mask of all our handlers will block all our other handlers. */
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(void)sigemptyset(&mask);
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for (sh = 0; sh < sizeof sighandlers / sizeof sighandlers[0]; sh++)
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sigaddset(&mask, sighandlers[sh].sig);
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/* Install our signal handlers with that shared mask. */
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for (sh = 0; sh < sizeof sighandlers / sizeof sighandlers[0]; sh++) {
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struct sigaction sa;
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memset(&sa, 0, sizeof sa);
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sa.sa_mask = mask;
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sa.sa_handler = sighandlers[sh].hand;
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if (sigaction(sighandlers[sh].sig, &sa, NULL) < 0)
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ns_error(ns_log_os,
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"sigaction failed in set_signal_handler(%d): %s",
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sighandlers[sh].sig, strerror(errno));
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}
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/* Unblock all signals that we expect to handle. */
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if (sigprocmask(SIG_UNBLOCK, &mask, NULL) < 0)
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ns_panic(ns_log_os, 1, "sigblock failed: %s", strerror(errno));
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}
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void
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block_signals(void) {
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INSIST(!blocked);
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if (sigprocmask(SIG_BLOCK, &mask, NULL) < 0)
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ns_panic(ns_log_os, 1, "sigblock failed: %s", strerror(errno));
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blocked = 1;
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}
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void
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unblock_signals(void) {
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INSIST(blocked);
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if (sigprocmask(SIG_UNBLOCK, &mask, NULL) < 0)
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ns_panic(ns_log_os, 1, "sigblock failed: %s", strerror(errno));
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blocked = 0;
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}
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