1 /* $Header: /p/tcsh/cvsroot/tcsh/tc.sig.c,v 3.40 2012/01/25 15:34:41 christos Exp $ */
3 * tc.sig.c: Signal routine emulations
6 * Copyright (c) 1980, 1991 The Regents of the University of California.
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
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.
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
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30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35 RCSID("$tcsh: tc.sig.c,v 3.40 2012/01/25 15:34:41 christos Exp $")
40 sigset_interrupting(int sig, void (*fn) (int))
45 sigemptyset(&act.sa_mask);
47 if (sigaction(sig, &act, NULL) == 0) {
51 sigprocmask(SIG_UNBLOCK, &set, NULL);
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; */
66 handle_pending_signals(void)
69 if (!phup_disabled && phup_pending) {
75 if (!pintr_disabled && pintr_pending) {
82 if (!pchild_disabled && pchild_pending) {
88 if (!alrmcatch_disabled && alrmcatch_pending) {
89 alrmcatch_pending = 0;
98 queue_alrmcatch(int sig)
101 alrmcatch_pending = 1;
105 queue_pchild(int sig)
126 disabled_cleanup(void *xdisabled)
130 disabled = xdisabled;
131 if (--*disabled == 0)
132 handle_pending_signals();
136 pintr_disabled_restore(void *xold)
141 pintr_disabled = *old;
145 pintr_push_enable(int *saved)
147 *saved = pintr_disabled;
149 cleanup_push(saved, pintr_disabled_restore);
150 handle_pending_signals();