/contrib/tcsh/tc.sig.c
https://bitbucket.org/freebsd/freebsd-head/ · C · 151 lines · 104 code · 15 blank · 32 comment · 12 complexity · a6fae47b769967acc173389166d6bc48 MD5 · raw file
- /* $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();
- }