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