152 lines
3.7 KiB
C
152 lines
3.7 KiB
C
/* $Header: /p/tcsh/cvsroot/tcsh/tc.sig.c,v 3.40 2012/01/25 15:34:41 christos Exp $ */
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/*
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* tc.sig.c: Signal routine emulations
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*/
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/*-
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* Copyright (c) 1980, 1991 The Regents of the University of California.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include "sh.h"
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RCSID("$tcsh: tc.sig.c,v 3.40 2012/01/25 15:34:41 christos Exp $")
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#include "tc.wait.h"
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void
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sigset_interrupting(int sig, void (*fn) (int))
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{
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struct sigaction act;
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act.sa_handler = fn;
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sigemptyset(&act.sa_mask);
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act.sa_flags = 0;
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if (sigaction(sig, &act, NULL) == 0) {
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sigset_t set;
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sigemptyset(&set);
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sigaddset(&set, sig);
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sigprocmask(SIG_UNBLOCK, &set, NULL);
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}
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}
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static volatile sig_atomic_t alrmcatch_pending; /* = 0; */
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static volatile sig_atomic_t pchild_pending; /* = 0; */
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static volatile sig_atomic_t phup_pending; /* = 0; */
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static volatile sig_atomic_t pintr_pending; /* = 0; */
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int alrmcatch_disabled; /* = 0; */
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int phup_disabled; /* = 0; */
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int pchild_disabled; /* = 0; */
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int pintr_disabled; /* = 0; */
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int handle_interrupt; /* = 0; */
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int
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handle_pending_signals(void)
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{
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int rv = 0;
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if (!phup_disabled && phup_pending) {
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phup_pending = 0;
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handle_interrupt++;
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phup();
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handle_interrupt--;
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}
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if (!pintr_disabled && pintr_pending) {
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pintr_pending = 0;
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handle_interrupt++;
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pintr();
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handle_interrupt--;
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rv = 1;
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}
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if (!pchild_disabled && pchild_pending) {
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pchild_pending = 0;
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handle_interrupt++;
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pchild();
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handle_interrupt--;
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}
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if (!alrmcatch_disabled && alrmcatch_pending) {
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alrmcatch_pending = 0;
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handle_interrupt++;
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alrmcatch();
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handle_interrupt--;
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}
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return rv;
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}
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void
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queue_alrmcatch(int sig)
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{
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USE(sig);
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alrmcatch_pending = 1;
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}
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void
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queue_pchild(int sig)
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{
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USE(sig);
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pchild_pending = 1;
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}
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void
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queue_phup(int sig)
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{
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USE(sig);
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phup_pending = 1;
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}
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void
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queue_pintr(int sig)
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{
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USE(sig);
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pintr_pending = 1;
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}
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void
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disabled_cleanup(void *xdisabled)
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{
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int *disabled;
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disabled = xdisabled;
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if (--*disabled == 0)
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handle_pending_signals();
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}
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void
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pintr_disabled_restore(void *xold)
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{
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int *old;
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old = xold;
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pintr_disabled = *old;
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}
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void
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pintr_push_enable(int *saved)
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{
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*saved = pintr_disabled;
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pintr_disabled = 0;
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cleanup_push(saved, pintr_disabled_restore);
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handle_pending_signals();
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}
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