kc3-lang/libevent/evsignal-internal.h

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• Hash : 1af745d0
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  Date : 2022-10-25T11:30:34
  

  signal: new signal handling backend based on signalfd
  
  Linux-specific signal handling backend based on signalfd(2)
  system call, and public function event_base_get_signal_method()
  to obtain an underlying kernel signal handling mechanism.
  
  Signed-off-by: Dmitry Antipov <dantipov@cloudlinux.com>
  

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• evsignal-internal.h

• /*
   * Copyright 2000-2007 Niels Provos <provos@citi.umich.edu>
   * Copyright 2007-2012 Niels Provos and Nick Mathewson
   *
   * 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. 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.
   */
  #ifndef EVSIGNAL_INTERNAL_H_INCLUDED_
  #define EVSIGNAL_INTERNAL_H_INCLUDED_
  
  #ifndef evutil_socket_t
  #include "event2/util.h"
  #endif
  #include <signal.h>
  
  typedef void (*ev_sighandler_t)(int);
  
  /* Data structure for the default signal-handling implementation in signal.c
   */
  struct evsig_info {
  	/* Event watching ev_signal_pair[1] */
  	struct event ev_signal;
  	/* Socketpair used to send notifications from the signal handler */
  	evutil_socket_t ev_signal_pair[2];
  	/* True iff we've added the ev_signal event yet. */
  	int ev_signal_added;
  	/* Count of the number of signals we're currently watching. */
  	int ev_n_signals_added;
  #ifdef EVENT__HAVE_SYS_SIGNALFD_H
  	/* EV_READ events used to wakeup corresponding EV_SIGNAL ones. */
  	struct event *ev_sigevent[NSIG];
  #endif /* EVENT__HAVE_SYS_SIGNALFD_H */
  
  	/* Array of previous signal handler objects before Libevent started
  	 * messing with them.  Used to restore old signal handlers. */
  #ifdef EVENT__HAVE_SIGACTION
  	struct sigaction **sh_old;
  #else
  	ev_sighandler_t **sh_old;
  #endif
  	/* Size of sh_old. */
  	int sh_old_max;
  };
  
  #ifdef EVENT__HAVE_SYS_SIGNALFD_H
  int sigfd_init_(struct event_base *);
  #else /* no signalfd() */
  static inline int
  sigfd_init_(struct event_base *base) { return -1; }
  #endif /* have signalfd() */
  
  int evsig_init_(struct event_base *);
  void evsig_dealloc_(struct event_base *);
  int evsig_ensure_saved_(struct evsig_info *, int);
  
  void evsig_set_base_(struct event_base *base);
  void evsig_free_globals_(void);
  
  #endif /* EVSIGNAL_INTERNAL_H_INCLUDED_ */
  

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