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/*
Copyright (c) 2007-2013 Contributors as noted in the AUTHORS file
This file is part of 0MQ.
0MQ is free software; you can redistribute it and/or modify it under
the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
0MQ 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 Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef __ZMQ_SIGNALER_HPP_INCLUDED__
#define __ZMQ_SIGNALER_HPP_INCLUDED__
#ifdef HAVE_FORK
#include <unistd.h>
#endif
#include "fd.hpp"
namespace zmq
{
// This is a cross-platform equivalent to signal_fd. However, as opposed
// to signal_fd there can be at most one signal in the signaler at any
// given moment. Attempt to send a signal before receiving the previous
// one will result in undefined behaviour.
class signaler_t
{
public:
signaler_t ();
~signaler_t ();
fd_t get_fd ();
void send ();
int wait (int timeout_);
void recv ();
#ifdef HAVE_FORK
// close the file descriptors in a forked child process so that they
// do not interfere with the context in the parent process.
void forked();
#endif
private:
// Creates a pair of filedescriptors that will be used
// to pass the signals.
static int make_fdpair (fd_t *r_, fd_t *w_);
// Underlying write & read file descriptor
// Will be -1 if we exceeded number of available handles
fd_t w;
fd_t r;
// Disable copying of signaler_t object.
signaler_t (const signaler_t&);
const signaler_t &operator = (const signaler_t&);
#ifdef HAVE_FORK
// the process that created this context. Used to detect forking.
pid_t pid;
// idempotent close of file descriptors that is safe to use by destructor
// and forked().
void close_internal();
#endif
};
}
#endif
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