linux-sgx-trts-modified/psw/ae/common/inc/NonBlockingUnixCommunicationSocket.h

/*
 * Copyright (C) 2011-2017 Intel Corporation. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *   * Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *   * 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.
 *   * Neither the name of Intel Corporation nor the names of its
 *     contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "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 COPYRIGHT
 * OWNER OR CONTRIBUTORS 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 __AE_NON_BLOCKING_COMM_SOCKET_H
#define __AE_NON_BLOCKING_COMM_SOCKET_H

#include <UnixCommunicationSocket.h>

#define MAX_EVENTS  12

class NonBlockingUnixCommunicationSocket : public UnixCommunicationSocket
{
public:
    NonBlockingUnixCommunicationSocket(const char* socketbase) : UnixCommunicationSocket(socketbase), mEvents(NULL), mEpoll(-1) {}    
    NonBlockingUnixCommunicationSocket(int socket) : UnixCommunicationSocket(socket), mEvents(NULL), mEpoll(-1) {}

    ~NonBlockingUnixCommunicationSocket();

    bool  init();
    char* readRaw(ssize_t length); //throw(SockDisconnectedException) = 0;
    ssize_t  writeRaw(const char* data, ssize_t length);
    int   getSockDescriptor();
    bool wasTimeoutDetected();
    bool setTimeout(uint32_t milliseconds);

    void Cancel() const;

protected:
    bool MakeNonBlocking();
    ssize_t partialRead(char* buffer, ssize_t maxLength);

    //members
    struct  epoll_event *mEvents;   //epoll for events on two sources: 0->special command pipe. 1->the socket
    int     mEpoll;
    int     mCommandPipe[2];
private:
    //non-copyable
    NonBlockingUnixCommunicationSocket(const NonBlockingUnixCommunicationSocket&);
    NonBlockingUnixCommunicationSocket& operator=(const NonBlockingUnixCommunicationSocket&);
};

#endif