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tc.sig.h
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Editing: tc.sig.c
/* * 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" #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_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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