kc3-lang/libevent/signal.c

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• Hash : b3d1c6a8
  Author :
  Date : 2003-02-28T22:38:30
  

  support poll(2) and split out the signal handling
  
  
  svn:r37
  

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• signal.c

• /*	$OpenBSD: select.c,v 1.2 2002/06/25 15:50:15 mickey Exp $	*/
  
  /*
   * Copyright 2000-2002 Niels Provos <provos@citi.umich.edu>
   * 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. All advertising materials mentioning features or use of this software
   *    must display the following acknowledgement:
   *      This product includes software developed by Niels Provos.
   * 4. The name of the author may not be used to endorse or promote products
   *    derived from this software without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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 "config.h"
  
  #include <sys/types.h>
  #ifdef HAVE_SYS_TIME_H
  #include <sys/time.h>
  #else
  #include <sys/_time.h>
  #endif
  #include <sys/queue.h>
  #include <signal.h>
  #include <stdio.h>
  #include <stdlib.h>
  #include <string.h>
  #include <unistd.h>
  #include <errno.h>
  #include <err.h>
  
  #ifdef USE_LOG
  #include "log.h"
  #else
  #define LOG_DBG(x)
  #define log_error(x)	perror(x)
  #endif
  
  #include "event.h"
  
  extern struct event_list timequeue;
  extern struct event_list eventqueue;
  extern struct event_list signalqueue;
  
  short evsigcaught[NSIG];
  volatile sig_atomic_t evsignal_caught = 0;
  
  struct selectop {
  	int event_fds;		/* Highest fd in fd set */
  	int event_fdsz;
  	fd_set *event_readset;
  	fd_set *event_writeset;
  	sigset_t evsigmask;
  } sop;
  
  void evsignal_process(void);
  int evsignal_recalc(sigset_t *);
  int evsignal_deliver(void);
  
  void
  evsignal_init(sigset_t *evsigmask)
  {
  	sigemptyset(evsigmask);
  }
  
  int
  evsignal_add(sigset_t *evsigmask, struct event *ev)
  {
  	int signal;
  	
  	if (ev->ev_events & (EV_READ|EV_WRITE))
  		errx(1, "%s: EV_SIGNAL incompatible use", __func__);
  	signal = EVENT_SIGNAL(ev);
  	sigaddset(evsigmask, signal);
  	
  	return (0);
  }
  
  /*
   * Nothing to be done here.
   */
  
  int
  evsignal_del(sigset_t *evsigmask, struct event *ev)
  {
  	int signal;
  
  	signal = EVENT_SIGNAL(ev);
  	sigdelset(evsigmask, signal);
  
  	return (sigaction(EVENT_SIGNAL(ev),(struct sigaction *)SIG_DFL, NULL));
  }
  
  static void
  evsignal_handler(int sig)
  {
  	evsigcaught[sig]++;
  	evsignal_caught = 1;
  }
  
  int
  evsignal_recalc(sigset_t *evsigmask)
  {
  	struct sigaction sa;
  	struct event *ev;
  
  	if (sigprocmask(SIG_BLOCK, evsigmask, NULL) == -1)
  		return (-1);
  	
  	/* Reinstall our signal handler. */
  	memset(&sa, 0, sizeof(sa));
  	sa.sa_handler = evsignal_handler;
  	sa.sa_mask = sop.evsigmask;
  	sa.sa_flags |= SA_RESTART;
  	
  	TAILQ_FOREACH(ev, &signalqueue, ev_signal_next) {
  		if (sigaction(EVENT_SIGNAL(ev), &sa, NULL) == -1)
  			return (-1);
  	}
  	return (0);
  }
  
  int
  evsignal_deliver(void)
  {
  	return (sigprocmask(SIG_UNBLOCK, &sop.evsigmask, NULL));
  	/* XXX - pending signals handled here */
  }
  
  void
  evsignal_process(void)
  {
  	struct event *ev;
  	short ncalls;
  
  	TAILQ_FOREACH(ev, &signalqueue, ev_signal_next) {
  		ncalls = evsigcaught[EVENT_SIGNAL(ev)];
  		if (ncalls) {
  			if (!(ev->ev_events & EV_PERSIST))
  				event_del(ev);
  			event_active(ev, EV_SIGNAL, ncalls);
  		}
  	}
  
  	memset(evsigcaught, 0, sizeof(evsigcaught));
  	evsignal_caught = 0;
  }
  
  

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