UnixIOChannel.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
 **
 ** 2005, 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_UNIXIOCHANNEL_H
#define NIDAS_CORE_UNIXIOCHANNEL_H

#include "IOChannel.h"

#include <fcntl.h>
#include <unistd.h>  // read(), write(), close(), ...

#include <string>
#include <iostream>

namespace nidas { namespace core {

class UnixIOChannel: public IOChannel {

public:

    UnixIOChannel(const std::string& name, int fd):
        _name(name),_fd(fd),_newInput(true)
    {
    }

    ~UnixIOChannel() {}

    UnixIOChannel* clone() const { return new UnixIOChannel(*this); }

    void requestConnection(IOChannelRequester* rqstr)
        throw(nidas::util::IOException)
    {
        rqstr->connected(this);
    }

    IOChannel* connect() throw(nidas::util::IOException)
    {
    return this;
    }

    void setNonBlocking(bool val) throw (nidas::util::IOException);

    bool isNonBlocking() const throw (nidas::util::IOException);

    virtual bool isNewInput() const { return _newInput; }

    size_t read(void* buf, size_t len) throw (nidas::util::IOException)
    {
        ssize_t res = ::read(_fd,buf,len);
    if (res < 0) throw nidas::util::IOException(getName(),"read",errno);
    _newInput = false;
    return res;
    }

    size_t write(const void* buf, size_t len) throw (nidas::util::IOException)
    {
        ssize_t res = ::write(_fd,buf,len);
    if (res < 0) throw nidas::util::IOException(getName(),"write",errno);
    _newInput = false;
    return res;
    }

    size_t write(const struct iovec* iov, int iovcnt) throw (nidas::util::IOException)
    {
        ssize_t res = ::writev(_fd,iov,iovcnt);
    if (res < 0) throw nidas::util::IOException(getName(),"write",errno);
    _newInput = false;
    return res;
    }

    void close() throw (nidas::util::IOException)
    {
        int res = ::close(_fd);
    if (res < 0) throw nidas::util::IOException(getName(),"close",errno);
    }

    int getFd() const
    {
        return _fd;
    }

    const std::string& getName() const { return _name; }

    void setName(const std::string& val) { _name = val; }

    void fromDOMElement(const xercesc::DOMElement*)
    throw(nidas::util::InvalidParameterException)
    {
        throw nidas::util::InvalidParameterException(
        "UnixIOChannel::fromDOMElement not supported");
    }

protected:

    UnixIOChannel(const UnixIOChannel& x): IOChannel(x),
        _name(x._name),_fd(x._fd),_newInput(x._newInput)
    {
    }

    std::string _name;

    int _fd;

    bool _newInput;
};

}}  // namespace nidas namespace core

#endif