167 lines
4.1 KiB
C
167 lines
4.1 KiB
C
/* $NetBSD: signal.c,v 1.3 2003/06/13 04:11:31 itojun Exp $ */
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/* $OpenBSD: select.c,v 1.2 2002/06/25 15:50:15 mickey Exp $ */
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/*
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* Copyright 2000-2002 Niels Provos <provos@citi.umich.edu>
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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. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Niels Provos.
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* 4. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "config.h"
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#include <sys/types.h>
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#ifdef HAVE_SYS_TIME_H
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#include <sys/time.h>
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#else
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#include <sys/_time.h>
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#endif
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#include <sys/queue.h>
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#include <signal.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <errno.h>
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#include <err.h>
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#ifdef USE_LOG
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#include "log.h"
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#else
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#define LOG_DBG(x)
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#define log_error(x) perror(x)
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#endif
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#include "event.h"
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#include "evsignal.h"
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extern struct event_list signalqueue;
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static short evsigcaught[NSIG];
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static int needrecalc;
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volatile sig_atomic_t evsignal_caught = 0;
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void evsignal_process(void);
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int evsignal_recalc(sigset_t *);
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int evsignal_deliver(sigset_t *);
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void
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evsignal_init(sigset_t *evsigmask)
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{
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sigemptyset(evsigmask);
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}
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int
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evsignal_add(sigset_t *evsigmask, struct event *ev)
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{
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int evsignal;
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if (ev->ev_events & (EV_READ|EV_WRITE))
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errx(1, "%s: EV_SIGNAL incompatible use", __func__);
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evsignal = EVENT_SIGNAL(ev);
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sigaddset(evsigmask, evsignal);
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return (0);
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}
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/*
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* Nothing to be done here.
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*/
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int
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evsignal_del(sigset_t *evsigmask, struct event *ev)
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{
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int evsignal;
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evsignal = EVENT_SIGNAL(ev);
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sigdelset(evsigmask, evsignal);
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needrecalc = 1;
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return (sigaction(EVENT_SIGNAL(ev),(struct sigaction *)SIG_DFL, NULL));
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}
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static void
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evsignal_handler(int sig)
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{
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evsigcaught[sig]++;
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evsignal_caught = 1;
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}
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int
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evsignal_recalc(sigset_t *evsigmask)
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{
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struct sigaction sa;
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struct event *ev;
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if (TAILQ_FIRST(&signalqueue) == NULL && !needrecalc)
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return (0);
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needrecalc = 0;
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if (sigprocmask(SIG_BLOCK, evsigmask, NULL) == -1)
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return (-1);
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/* Reinstall our signal handler. */
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memset(&sa, 0, sizeof(sa));
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sa.sa_handler = evsignal_handler;
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sa.sa_mask = *evsigmask;
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sa.sa_flags |= SA_RESTART;
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TAILQ_FOREACH(ev, &signalqueue, ev_signal_next) {
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if (sigaction(EVENT_SIGNAL(ev), &sa, NULL) == -1)
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return (-1);
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}
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return (0);
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}
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int
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evsignal_deliver(sigset_t *evsigmask)
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{
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if (TAILQ_FIRST(&signalqueue) == NULL)
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return (0);
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return (sigprocmask(SIG_UNBLOCK, evsigmask, NULL));
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/* XXX - pending signals handled here */
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}
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void
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evsignal_process(void)
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{
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struct event *ev;
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short ncalls;
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TAILQ_FOREACH(ev, &signalqueue, ev_signal_next) {
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ncalls = evsigcaught[EVENT_SIGNAL(ev)];
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if (ncalls) {
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if (!(ev->ev_events & EV_PERSIST))
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event_del(ev);
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event_active(ev, EV_SIGNAL, ncalls);
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}
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}
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memset(evsigcaught, 0, sizeof(evsigcaught));
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evsignal_caught = 0;
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}
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