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)
    {
        rqstr->connected(this);
    }
 
    IOChannel* connect()
    {
        return this;
    }
 
    void setNonBlocking(bool val);
 
    bool isNonBlocking() const;
 
    virtual bool isNewInput() const { return _newInput; }
 
    size_t read(void* buf, size_t len)
    {
        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)
    {
        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)
    {
        ssize_t res = ::writev(_fd,iov,iovcnt);
        if (res < 0) throw nidas::util::IOException(getName(),"write",errno);
        _newInput = false;
        return res;
    }
 
    void close()
    {
        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(
        "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