17c478bd9Sstevel@tonic-gate /*
27c478bd9Sstevel@tonic-gate * CDDL HEADER START
37c478bd9Sstevel@tonic-gate *
47c478bd9Sstevel@tonic-gate * The contents of this file are subject to the terms of the
57c478bd9Sstevel@tonic-gate * Common Development and Distribution License, Version 1.0 only
67c478bd9Sstevel@tonic-gate * (the "License"). You may not use this file except in compliance
77c478bd9Sstevel@tonic-gate * with the License.
87c478bd9Sstevel@tonic-gate *
97c478bd9Sstevel@tonic-gate * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
107c478bd9Sstevel@tonic-gate * or http://www.opensolaris.org/os/licensing.
117c478bd9Sstevel@tonic-gate * See the License for the specific language governing permissions
127c478bd9Sstevel@tonic-gate * and limitations under the License.
137c478bd9Sstevel@tonic-gate *
147c478bd9Sstevel@tonic-gate * When distributing Covered Code, include this CDDL HEADER in each
157c478bd9Sstevel@tonic-gate * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
167c478bd9Sstevel@tonic-gate * If applicable, add the following below this CDDL HEADER, with the
177c478bd9Sstevel@tonic-gate * fields enclosed by brackets "[]" replaced with your own identifying
187c478bd9Sstevel@tonic-gate * information: Portions Copyright [yyyy] [name of copyright owner]
197c478bd9Sstevel@tonic-gate *
207c478bd9Sstevel@tonic-gate * CDDL HEADER END
217c478bd9Sstevel@tonic-gate */
227c478bd9Sstevel@tonic-gate /* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
23*6241c4c0SToomas Soome /* All Rights Reserved */
247c478bd9Sstevel@tonic-gate
257c478bd9Sstevel@tonic-gate #include "signal.h"
267c478bd9Sstevel@tonic-gate
277c478bd9Sstevel@tonic-gate #include "lpadmin.h"
287c478bd9Sstevel@tonic-gate
297c478bd9Sstevel@tonic-gate static int trapping = -1; /* -1 means first time */
307c478bd9Sstevel@tonic-gate
317c478bd9Sstevel@tonic-gate static
327c478bd9Sstevel@tonic-gate #ifdef SIGPOLL
337c478bd9Sstevel@tonic-gate void
347c478bd9Sstevel@tonic-gate #else
357c478bd9Sstevel@tonic-gate int
367c478bd9Sstevel@tonic-gate #endif
377c478bd9Sstevel@tonic-gate (*old_sighup)(),
387c478bd9Sstevel@tonic-gate (*old_sigint)(),
397c478bd9Sstevel@tonic-gate (*old_sigquit)(),
407c478bd9Sstevel@tonic-gate (*old_sigterm)();
417c478bd9Sstevel@tonic-gate
427c478bd9Sstevel@tonic-gate /**
437c478bd9Sstevel@tonic-gate ** catch() - CLEAN UP AFTER SIGNAL
447c478bd9Sstevel@tonic-gate **/
457c478bd9Sstevel@tonic-gate
467c478bd9Sstevel@tonic-gate static void
catch(int sig __unused)47*6241c4c0SToomas Soome catch (int sig __unused)
487c478bd9Sstevel@tonic-gate {
497c478bd9Sstevel@tonic-gate (void)signal (SIGHUP, SIG_IGN);
507c478bd9Sstevel@tonic-gate (void)signal (SIGINT, SIG_IGN);
517c478bd9Sstevel@tonic-gate (void)signal (SIGQUIT, SIG_IGN);
527c478bd9Sstevel@tonic-gate (void)signal (SIGTERM, SIG_IGN);
537c478bd9Sstevel@tonic-gate done (1);
547c478bd9Sstevel@tonic-gate }
557c478bd9Sstevel@tonic-gate
567c478bd9Sstevel@tonic-gate /**
577c478bd9Sstevel@tonic-gate ** trap_signals() - SET SIGNALS TO BE CAUGHT FOR CLEAN EXIT
587c478bd9Sstevel@tonic-gate **/
597c478bd9Sstevel@tonic-gate
trap_signals()607c478bd9Sstevel@tonic-gate void trap_signals ()
617c478bd9Sstevel@tonic-gate {
627c478bd9Sstevel@tonic-gate switch (trapping) {
637c478bd9Sstevel@tonic-gate
647c478bd9Sstevel@tonic-gate case -1: /* first time */
657c478bd9Sstevel@tonic-gate
667c478bd9Sstevel@tonic-gate #define SETSIG(SIG) \
677c478bd9Sstevel@tonic-gate if (signal(SIG, SIG_IGN) != SIG_IGN) \
687c478bd9Sstevel@tonic-gate signal (SIG, catch);
697c478bd9Sstevel@tonic-gate
707c478bd9Sstevel@tonic-gate SETSIG (SIGHUP);
717c478bd9Sstevel@tonic-gate SETSIG (SIGINT);
727c478bd9Sstevel@tonic-gate SETSIG (SIGQUIT);
737c478bd9Sstevel@tonic-gate SETSIG (SIGTERM);
747c478bd9Sstevel@tonic-gate break;
757c478bd9Sstevel@tonic-gate
767c478bd9Sstevel@tonic-gate case 0: /* currently ignoring */
777c478bd9Sstevel@tonic-gate signal (SIGHUP, old_sighup);
787c478bd9Sstevel@tonic-gate signal (SIGINT, old_sigint);
797c478bd9Sstevel@tonic-gate signal (SIGQUIT, old_sigquit);
807c478bd9Sstevel@tonic-gate signal (SIGTERM, old_sigterm);
817c478bd9Sstevel@tonic-gate trapping = 1;
827c478bd9Sstevel@tonic-gate break;
837c478bd9Sstevel@tonic-gate
847c478bd9Sstevel@tonic-gate case 1: /* already trapping */
857c478bd9Sstevel@tonic-gate break;
867c478bd9Sstevel@tonic-gate
877c478bd9Sstevel@tonic-gate }
887c478bd9Sstevel@tonic-gate return;
897c478bd9Sstevel@tonic-gate }
907c478bd9Sstevel@tonic-gate
917c478bd9Sstevel@tonic-gate /**
927c478bd9Sstevel@tonic-gate ** ignore_signals() - SET SIGNALS TO BE IGNORED FOR CRITICAL SECTIONS
937c478bd9Sstevel@tonic-gate **/
947c478bd9Sstevel@tonic-gate
ignore_signals()957c478bd9Sstevel@tonic-gate void ignore_signals ()
967c478bd9Sstevel@tonic-gate {
977c478bd9Sstevel@tonic-gate switch (trapping) {
987c478bd9Sstevel@tonic-gate
997c478bd9Sstevel@tonic-gate case -1: /* first time */
1007c478bd9Sstevel@tonic-gate trap_signals ();
1017c478bd9Sstevel@tonic-gate /*fall through*/
1027c478bd9Sstevel@tonic-gate
1037c478bd9Sstevel@tonic-gate case 1: /* currently trapping */
1047c478bd9Sstevel@tonic-gate old_sighup = signal(SIGHUP, SIG_IGN);
1057c478bd9Sstevel@tonic-gate old_sigint = signal(SIGINT, SIG_IGN);
1067c478bd9Sstevel@tonic-gate old_sigquit = signal(SIGQUIT, SIG_IGN);
1077c478bd9Sstevel@tonic-gate old_sigterm = signal(SIGTERM, SIG_IGN);
1087c478bd9Sstevel@tonic-gate trapping = 0;
1097c478bd9Sstevel@tonic-gate break;
1107c478bd9Sstevel@tonic-gate
1117c478bd9Sstevel@tonic-gate case 0: /* already ignoring */
1127c478bd9Sstevel@tonic-gate break;
1137c478bd9Sstevel@tonic-gate
1147c478bd9Sstevel@tonic-gate }
1157c478bd9Sstevel@tonic-gate return;
1167c478bd9Sstevel@tonic-gate }
117