tcp_socket.cpp

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/*
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 * Copyright (c) 2011, Southwest Research Institute
 * All rights reserved.
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 *      * Redistributions of source code must retain the above copyright
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 *      documentation and/or other materials provided with the distribution.
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 *      of its contributors may be used to endorse or promote products derived
 *      from this software without specific prior written permission.
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 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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#ifndef FLATHEADERS
#include "simple_message/socket/tcp_socket.h"
#include "simple_message/log_wrapper.h"
#include "simple_message/simple_message.h"
#include "simple_message/shared_types.h"
#else
#include "tcp_socket.h"
#include "log_wrapper.h"
#include "simple_message.h"
#include "shared_types.h"
#endif
 
using namespace industrial::smpl_msg_connection;
using namespace industrial::byte_array;
using namespace industrial::simple_message;
using namespace industrial::shared_types;
 
namespace industrial
{
namespace tcp_socket
{
 
TcpSocket::TcpSocket()
{
}
 
TcpSocket::~TcpSocket()
// Closes socket
{
  LOG_DEBUG("Destructing TCPSocket");
  CLOSE(this->getSockHandle());
}
 
int TcpSocket::rawSendBytes(char *buffer, shared_int num_bytes)
{
  int rc = this->SOCKET_FAIL;
 
  rc = SEND(this->getSockHandle(), buffer, num_bytes, 0);
  
  return rc;
}
 
int TcpSocket::rawReceiveBytes(char *buffer, shared_int num_bytes)
{
  int rc = this->SOCKET_FAIL;
  
  rc = RECV(this->getSockHandle(), buffer, num_bytes, 0);
  
  return rc;
}
 
bool TcpSocket::rawPoll(int timeout, bool & ready, bool & error)
{
  timeval time;
  fd_set read, write, except;
  int rc = this->SOCKET_FAIL;
  bool rtn = false;
  ready = false;
  error = false;
 
  // The select function uses the timeval data structure
  time.tv_sec = timeout / 1000;
  time.tv_usec = (timeout % 1000) * 1000;
 
  FD_ZERO(&read);
  FD_ZERO(&write);
  FD_ZERO(&except);
 
  FD_SET(this->getSockHandle(), &read);
  FD_SET(this->getSockHandle(), &except);
 
  rc = SELECT(this->getSockHandle() + 1, &read, &write, &except, &time);
 
  if (this->SOCKET_FAIL != rc) {
    if (0 == rc)
      rtn = false;
    else {
      if (FD_ISSET(this->getSockHandle(), &read)) {
        ready = true;
        rtn = true;
      }
      else if(FD_ISSET(this->getSockHandle(), &except)) {
        error = true;
        rtn = true;
      }
      else {
        LOG_WARN("Select returned, but no flags are set");
        rtn = false;
      }
    }
  } else {
    this->logSocketError("Socket select function failed", rc, errno);
    rtn = false;
  }
  return rtn;
}
 
} //tcp_socket
} //industrial