evSignal.h

Go to the documentation of this file.

/*
 *
 * EVITA: Efficient Visualization of Terascale Datasets
 * Copyright (C) 2000-2016  Team Evita
 * 
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 * 
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Library General Public License for more details.
 * 
 * You should have received a copy of the GNU Library General Public
 * License along with this library; if not, write to the
 * Free Software Foundation, Inc., 675 Mass Ave, Cambridge,
 * MA 02139, USA.
 *
 */


#ifndef __evSignal_h
#define __evSignal_h


#include "evConfig.h"

#include <unistd.h>
#include <signal.h>
#include <sys/wait.h>
#include <errno.h>
#include <sys/types.h>


#define EVSIGNAL_DISCONNECT (SIGRTMIN)
#define EVSIGNAL_CLOSE (SIGRTMIN + 1)
#define EVSIGNAL_QUIT (SIGRTMIN + 2)

typedef void evSignalHandler(int);


inline int evSignalBlock(const int signal)
{
  sigset_t set;

  sigemptyset(&set);
  sigaddset(&set, signal);

  return(pthread_sigmask(SIG_BLOCK, &set, NULL) != 0);
}


inline int evSignalUnblock(const int signal)
{
  sigset_t set;

  sigemptyset(&set);
  sigaddset(&set, signal);

  return(pthread_sigmask(SIG_UNBLOCK, &set, NULL) != 0);
}


inline int evSignalSetHandler(const int signal,
                              evSignalHandler signal_handler)
{
  struct sigaction action, old_action;

  action.sa_handler = signal_handler;
  sigemptyset(&action.sa_mask);
  action.sa_flags = 0;
#ifdef SA_INTERRUPT
  action.sa_flags |= SA_INTERRUPT;
#endif
  return(sigaction(signal, &action, &old_action) != 0);
}


inline int evSignalSend(const int signal)
{
  return(kill(0, signal) != 0);
}


inline int evSignalWait(void)
{
  sigset_t signal_set;

  sigfillset(&signal_set);

  int signal;
  sigwait(&signal_set, &signal);

  return(signal);
}


inline void evSignalStartSession(void)
{
  setsid();
}


#endif