diff options
Diffstat (limited to 'contrib/bind/bin/named/ns_signal.c')
| -rw-r--r-- | contrib/bind/bin/named/ns_signal.c | 264 |
1 files changed, 264 insertions, 0 deletions
diff --git a/contrib/bind/bin/named/ns_signal.c b/contrib/bind/bin/named/ns_signal.c new file mode 100644 index 0000000..4c7c48a --- /dev/null +++ b/contrib/bind/bin/named/ns_signal.c @@ -0,0 +1,264 @@ +#if !defined(lint) && !defined(SABER) +static const char sccsid[] = "@(#)ns_main.c 4.55 (Berkeley) 7/1/91"; +static const char rcsid[] = "$Id: ns_signal.c,v 8.11 1999/10/13 16:39:12 vixie Exp $"; +#endif /* not lint */ + +/* + * Copyright (c) 1986, 1989, 1990 + * 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. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the University of + * California, Berkeley and its contributors. + * 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. + */ + +/* + * Portions Copyright (c) 1993 by Digital Equipment Corporation. + * + * Permission to use, copy, modify, and distribute this software for any + * purpose with or without fee is hereby granted, provided that the above + * copyright notice and this permission notice appear in all copies, and that + * the name of Digital Equipment Corporation not be used in advertising or + * publicity pertaining to distribution of the document or software without + * specific, written prior permission. + * + * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL + * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES + * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT + * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL + * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR + * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS + * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS + * SOFTWARE. + */ + +/* + * Portions Copyright (c) 1996-1999 by Internet Software Consortium. + * + * Permission to use, copy, modify, and distribute this software for any + * purpose with or without fee is hereby granted, provided that the above + * copyright notice and this permission notice appear in all copies. + * + * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS + * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES + * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE + * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL + * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR + * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS + * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS + * SOFTWARE. + */ + +/* Import. */ + +#include "port_before.h" + +#include <sys/types.h> +#include <sys/param.h> +#include <sys/file.h> +#include <sys/stat.h> +#include <sys/wait.h> +#include <sys/ioctl.h> +#include <sys/socket.h> +#ifdef SVR4 /* XXX */ +# include <sys/sockio.h> +#else +# include <sys/mbuf.h> +#endif + +#include <netinet/in.h> +#include <net/route.h> +#include <net/if.h> +#include <arpa/nameser.h> +#include <arpa/inet.h> + +#include <ctype.h> +#include <errno.h> +#include <fcntl.h> +#include <grp.h> +#include <stdio.h> +#include <stdlib.h> +#include <signal.h> +#include <netdb.h> +#include <pwd.h> +#include <resolv.h> +#include <string.h> +#include <syslog.h> +#include <time.h> +#include <unistd.h> + +#include <isc/eventlib.h> +#include <isc/logging.h> +#include <isc/memcluster.h> +#include <isc/list.h> + +#include "port_after.h" +#include "named.h" + +/* Forward. */ + +static SIG_FN onhup(int); +static SIG_FN onintr(int); +static SIG_FN setdumpflg(int); +static SIG_FN setIncrDbgFlg(int); +static SIG_FN setNoDbgFlg(int); +static SIG_FN setQrylogFlg(int); +static SIG_FN setstatsflg(int); +static SIG_FN discard_pipe(int); +static SIG_FN setreapflg(int); + +/* Data. */ + +static struct { + int sig; + SIG_FN (*hand)(int); +} sighandlers[] = { +#ifdef DEBUG + { SIGUSR1, setIncrDbgFlg }, + { SIGUSR2, setNoDbgFlg }, +#endif +#if defined(SIGWINCH) && defined(QRYLOG) + { SIGWINCH, setQrylogFlg }, +#endif +#if defined(SIGXFSZ) + { SIGXFSZ, onhup }, /* Wierd DEC Hesiodism, harmless. */ +#endif + { SIGINT, setdumpflg }, + { SIGILL, setstatsflg }, + { SIGHUP, onhup }, + { SIGCHLD, setreapflg }, + { SIGPIPE, discard_pipe }, + { SIGTERM, onintr } +}; + +static sigset_t mask; +static int blocked = 0; + +/* Private. */ + +static SIG_FN +onhup(int sig) { + ns_need_unsafe(main_need_reload); +} + +static SIG_FN +onintr(int sig) { + ns_need_unsafe(main_need_exit); +} + +static SIG_FN +setdumpflg(int sig) { + ns_need_unsafe(main_need_dump); +} + +#ifdef DEBUG +static SIG_FN +setIncrDbgFlg(int sig) { + desired_debug++; + ns_need_unsafe(main_need_debug); +} + +static SIG_FN +setNoDbgFlg(int sig) { + desired_debug = 0; + ns_need_unsafe(main_need_debug); +} +#endif /*DEBUG*/ + +#if defined(QRYLOG) && defined(SIGWINCH) +static SIG_FN +setQrylogFlg(int sig) { + ns_need_unsafe(main_need_qrylog); +} +#endif /*QRYLOG && SIGWINCH*/ + +static SIG_FN +setstatsflg(int sig) { + ns_need_unsafe(main_need_statsdump); +} + +static SIG_FN +discard_pipe(int sig) { +#ifdef SIGPIPE_ONE_SHOT + int saved_errno = errno; + struct sigaction sa; + + memset(&sa, 0, sizeof sa); + sa.sa_mask = mask; + sa.sa_handler = discard_pipe; + if (sigaction(SIGPIPE, &sa, NULL) < 0) + ns_error(ns_log_os, "sigaction failed in discard_pipe: %s", + strerror(errno)); + errno = saved_errno; +#endif +} + +static SIG_FN +setreapflg(int sig) { + ns_need_unsafe(main_need_reap); +} + +/* Public. */ + +void +init_signals(void) { + int sh; + + /* The mask of all our handlers will block all our other handlers. */ + (void)sigemptyset(&mask); + for (sh = 0; sh < sizeof sighandlers / sizeof sighandlers[0]; sh++) + sigaddset(&mask, sighandlers[sh].sig); + + /* Install our signal handlers with that shared mask. */ + for (sh = 0; sh < sizeof sighandlers / sizeof sighandlers[0]; sh++) { + struct sigaction sa; + + memset(&sa, 0, sizeof sa); + sa.sa_mask = mask; + sa.sa_handler = sighandlers[sh].hand; + if (sigaction(sighandlers[sh].sig, &sa, NULL) < 0) + ns_error(ns_log_os, + "sigaction failed in set_signal_handler(%d): %s", + sighandlers[sh].sig, strerror(errno)); + } +} + +void +block_signals(void) { + INSIST(!blocked); + if (sigprocmask(SIG_BLOCK, &mask, NULL) < 0) + ns_panic(ns_log_os, 1, "sigblock failed: %s", strerror(errno)); + blocked = 1; +} + +void +unblock_signals(void) { + INSIST(blocked); + if (sigprocmask(SIG_UNBLOCK, &mask, NULL) < 0) + ns_panic(ns_log_os, 1, "sigblock failed: %s", strerror(errno)); + blocked = 0; +} |
