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Socket.cpp

//
// Socket.cpp
//
// $Id: //poco/1.2/Net/src/Socket.cpp#2 $
//
// Library: Net
// Package: Sockets
// Module:  Socket
//
// Copyright (c) 2005-2006, Applied Informatics Software Engineering GmbH.
// and Contributors.
//
// Permission is hereby granted, free of charge, to any person or organization
// obtaining a copy of the software and accompanying documentation covered by
// this license (the "Software") to use, reproduce, display, distribute,
// execute, and transmit the Software, and to prepare derivative works of the
// Software, and to permit third-parties to whom the Software is furnished to
// do so, all subject to the following:
// 
// The copyright notices in the Software and this entire statement, including
// the above license grant, this restriction and the following disclaimer,
// must be included in all copies of the Software, in whole or in part, and
// all derivative works of the Software, unless such copies or derivative
// works are solely in the form of machine-executable object code generated by
// a source language processor.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
// SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
// FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
// ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.
//


#include "Poco/Net/Socket.h"
#include "Poco/Net/StreamSocketImpl.h"
#include "Poco/Timestamp.h"
#include <algorithm>
#include <string.h>


namespace Poco {
namespace Net {


Socket::Socket():
      _pImpl(new StreamSocketImpl)
{
}


00054 Socket::Socket(SocketImpl* pImpl):
      _pImpl(pImpl)
{
      poco_check_ptr (_pImpl);
}


00061 Socket::Socket(const Socket& socket):
      _pImpl(socket._pImpl)
{
      poco_check_ptr (_pImpl);

      _pImpl->duplicate();
}

      
00070 Socket& Socket::operator = (const Socket& socket)
{
      if (&socket != this)
      {
            if (_pImpl) _pImpl->release();
            _pImpl = socket._pImpl;
            if (_pImpl) _pImpl->duplicate();
      }
      return *this;
}


00082 Socket::~Socket()
{
      _pImpl->release();
}


00088 int Socket::select(SocketList& readList, SocketList& writeList, SocketList& exceptList, const Poco::Timespan& timeout)
{
      fd_set fdRead;
      fd_set fdWrite;
      fd_set fdExcept;
      int nfd = 0;
      FD_ZERO(&fdRead);
      for (SocketList::const_iterator it = readList.begin(); it != readList.end(); ++it)
      {
            if (int(it->sockfd()) > nfd)
                  nfd = int(it->sockfd());
            FD_SET(it->sockfd(), &fdRead);
      }
      FD_ZERO(&fdWrite);
      for (SocketList::const_iterator it = writeList.begin(); it != writeList.end(); ++it)
      {
            if (int(it->sockfd()) > nfd)
                  nfd = int(it->sockfd());
            FD_SET(it->sockfd(), &fdWrite);
      }
      FD_ZERO(&fdExcept);
      for (SocketList::const_iterator it = exceptList.begin(); it != exceptList.end(); ++it)
      {
            if (int(it->sockfd()) > nfd)
                  nfd = int(it->sockfd());
            FD_SET(it->sockfd(), &fdExcept);
      }
      Poco::Timespan remainingTime(timeout);
      int rc;
      do
      {
            struct timeval tv;
            tv.tv_sec  = (long) remainingTime.totalSeconds();
            tv.tv_usec = (long) remainingTime.useconds();
            Poco::Timestamp start;
            rc = ::select(nfd + 1, &fdRead, &fdWrite, &fdExcept, &tv);
            if (rc < 0 && SocketImpl::lastError() == POCO_EINTR)
            {
                  Poco::Timestamp end;
                  Poco::Timespan waited = end - start;
                  if (waited > remainingTime)
                        remainingTime -= waited;
                  else
                        remainingTime = 0;
            }
      }
      while (rc < 0 && SocketImpl::lastError() == POCO_EINTR);
      if (rc < 0) SocketImpl::error();
      
      SocketList readyReadList;
      for (SocketList::const_iterator it = readList.begin(); it != readList.end(); ++it)
      {
            if (FD_ISSET(it->sockfd(), &fdRead))
                  readyReadList.push_back(*it);
      }
      std::swap(readList, readyReadList);
      SocketList readyWriteList;
      for (SocketList::const_iterator it = writeList.begin(); it != writeList.end(); ++it)
      {
            if (FD_ISSET(it->sockfd(), &fdWrite))
                  readyWriteList.push_back(*it);
      }
      std::swap(writeList, readyWriteList);
      SocketList readyExceptList;
      for (SocketList::const_iterator it = exceptList.begin(); it != exceptList.end(); ++it)
      {
            if (FD_ISSET(it->sockfd(), &fdExcept))
                  readyExceptList.push_back(*it);
      }
      std::swap(exceptList, readyExceptList);   
      return rc; 
}


} } // namespace Poco::Net

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