Polled.h

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// -*- mode: C++; indent-tabs-mode: nil; c-basic-offset: 4; tab-width: 4; -*-
// vim: set shiftwidth=4 softtabstop=4 expandtab:
/*
 ********************************************************************
 ** NIDAS: NCAR In-situ Data Acquistion Software
 **
 ** 2013, Copyright University Corporation for Atmospheric Research
 **
 ** This program is free software; you can redistribute it and/or modify
 ** it under the terms of the GNU General Public License as published by
 ** the Free Software Foundation; either version 2 of the License, or
 ** (at your option) any later version.
 **
 ** This program 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 General Public License for more details.
 **
 ** The LICENSE.txt file accompanying this software contains
 ** a copy of the GNU General Public License. If it is not found,
 ** write to the Free Software Foundation, Inc.,
 ** 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 **
 ********************************************************************
*/

#ifndef NIDAS_CORE_POLLED_H
#define NIDAS_CORE_POLLED_H

#define POLL_EPOLL_ET   0       /* epoll edge-triggered */
#define POLL_EPOLL_LT   1       /* epoll level-triggered */
#define POLL_PSELECT    2       /* pselect */
#define POLL_POLL       3       /* poll/ppoll */

#define POLLING_METHOD POLL_EPOLL_LT

#include <sys/poll.h>

#define N_POLLIN POLLIN
#define N_POLLERR POLLERR
#define N_POLLHUP POLLHUP

// POLLRDHUP is somewhat new (Linux 2.6.17)
#ifdef POLLRDHUP
#define N_POLLRDHUP POLLRDHUP
#else
#define N_POLLRDHUP POLLHUP
#endif

#if POLLING_METHOD == POLL_PSELECT
#include <sys/select.h>
#endif

#if POLLING_METHOD == POLL_EPOLL_ET || POLLING_METHOD == POLL_EPOLL_LT
#include <sys/epoll.h>
#endif

namespace nidas { namespace core {

class Polled {
public:
    virtual ~Polled() {}

    virtual int getFd() const = 0;

    virtual bool handlePollEvents(uint32_t events) throw() = 0;
};

}}  // namespace nidas namespace core

#endif