1 /* $Header: /p/tcsh/cvsroot/tcsh/tc.sig.c,v 3.40 2012/01/25 15:34:41 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 3.40 2012/01/25 15:34:41 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 int handle_interrupt; /* = 0; */ 64 65 int 66 handle_pending_signals(void) 67 { 68 int rv = 0; 69 if (!phup_disabled && phup_pending) { 70 phup_pending = 0; 71 handle_interrupt++; 72 phup(); 73 handle_interrupt--; 74 } 75 if (!pintr_disabled && pintr_pending) { 76 pintr_pending = 0; 77 handle_interrupt++; 78 pintr(); 79 handle_interrupt--; 80 rv = 1; 81 } 82 if (!pchild_disabled && pchild_pending) { 83 pchild_pending = 0; 84 handle_interrupt++; 85 pchild(); 86 handle_interrupt--; 87 } 88 if (!alrmcatch_disabled && alrmcatch_pending) { 89 alrmcatch_pending = 0; 90 handle_interrupt++; 91 alrmcatch(); 92 handle_interrupt--; 93 } 94 return rv; 95 } 96 97 void 98 queue_alrmcatch(int sig) 99 { 100 USE(sig); 101 alrmcatch_pending = 1; 102 } 103 104 void 105 queue_pchild(int sig) 106 { 107 USE(sig); 108 pchild_pending = 1; 109 } 110 111 void 112 queue_phup(int sig) 113 { 114 USE(sig); 115 phup_pending = 1; 116 } 117 118 void 119 queue_pintr(int sig) 120 { 121 USE(sig); 122 pintr_pending = 1; 123 } 124 125 void 126 disabled_cleanup(void *xdisabled) 127 { 128 int *disabled; 129 130 disabled = xdisabled; 131 if (--*disabled == 0) 132 handle_pending_signals(); 133 } 134 135 void 136 pintr_disabled_restore(void *xold) 137 { 138 int *old; 139 140 old = xold; 141 pintr_disabled = *old; 142 } 143 144 void 145 pintr_push_enable(int *saved) 146 { 147 *saved = pintr_disabled; 148 pintr_disabled = 0; 149 cleanup_push(saved, pintr_disabled_restore); 150 handle_pending_signals(); 151 } 152