1 /* $Header: /p/tcsh/cvsroot/tcsh/tc.sig.c,v 3.36 2006/08/24 20:56:31 christos Exp $ */ 2 /* 3 * tc.sig.c: Signal routine emulations 4 */ 5 /*- 6 * Copyright (c) 1980, 1991 The Regents of the University of California. 7 * All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 #include "sh.h" 34 35 RCSID("$tcsh: tc.sig.c,v 3.36 2006/08/24 20:56:31 christos Exp $") 36 37 #include "tc.wait.h" 38 39 void 40 sigset_interrupting(int sig, void (*fn) (int)) 41 { 42 struct sigaction act; 43 44 act.sa_handler = fn; 45 sigemptyset(&act.sa_mask); 46 act.sa_flags = 0; 47 if (sigaction(sig, &act, NULL) == 0) { 48 sigset_t set; 49 sigemptyset(&set); 50 sigaddset(&set, sig); 51 sigprocmask(SIG_UNBLOCK, &set, NULL); 52 } 53 } 54 55 static volatile sig_atomic_t alrmcatch_pending; /* = 0; */ 56 static volatile sig_atomic_t pchild_pending; /* = 0; */ 57 static volatile sig_atomic_t phup_pending; /* = 0; */ 58 static volatile sig_atomic_t pintr_pending; /* = 0; */ 59 int alrmcatch_disabled; /* = 0; */ 60 int phup_disabled; /* = 0; */ 61 int pchild_disabled; /* = 0; */ 62 int pintr_disabled; /* = 0; */ 63 64 void 65 handle_pending_signals(void) 66 { 67 if (!phup_disabled && phup_pending) { 68 phup_pending = 0; 69 phup(); 70 } 71 if (!pintr_disabled && pintr_pending) { 72 pintr_pending = 0; 73 pintr(); 74 } 75 if (!pchild_disabled && pchild_pending) { 76 pchild_pending = 0; 77 pchild(); 78 } 79 if (!alrmcatch_disabled && alrmcatch_pending) { 80 alrmcatch_pending = 0; 81 alrmcatch(); 82 } 83 } 84 85 void 86 queue_alrmcatch(int sig) 87 { 88 USE(sig); 89 alrmcatch_pending = 1; 90 } 91 92 void 93 queue_pchild(int sig) 94 { 95 USE(sig); 96 pchild_pending = 1; 97 } 98 99 void 100 queue_phup(int sig) 101 { 102 USE(sig); 103 phup_pending = 1; 104 } 105 106 void 107 queue_pintr(int sig) 108 { 109 USE(sig); 110 pintr_pending = 1; 111 } 112 113 void 114 disabled_cleanup(void *xdisabled) 115 { 116 int *disabled; 117 118 disabled = xdisabled; 119 if (--*disabled == 0) 120 handle_pending_signals(); 121 } 122 123 void 124 pintr_disabled_restore(void *xold) 125 { 126 int *old; 127 128 old = xold; 129 pintr_disabled = *old; 130 } 131 132 void 133 pintr_push_enable(int *saved) 134 { 135 *saved = pintr_disabled; 136 pintr_disabled = 0; 137 cleanup_push(saved, pintr_disabled_restore); 138 handle_pending_signals(); 139 } 140