//
// JTAGEMUL.C
//
// Emulates a JTAG hardware interface via the parallel port
// and a JTAG/parallel port dongle to target hardware that
// interfaces to GDB via the remote debugging protocol.
//
// Copyright (c) 2002, Jason Riffel - TotalEmbedded LLC.
// 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 TotalEmbedded 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.
//

//
// INCLUDES
//
#include <errno.h>
#include <signal.h>
#include <stdio.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/wait.h>
#include <netinet/in.h>
#include <netdb.h>
#include "jtagsock.h"
#include "gdbrdp.h"

//
// DEFINES
//
#define PORTNUM                 50000

//
// main
//
// The heart of it all.
//
int main(void)
{
  int i_socket, i_currentsocket, i_flags;

  // Establish connection to port
  i_socket = fJTAGSOCK_Establish(PORTNUM);
  if (i_socket < 0)
  {
    // Establish failed.
    perror("fJTAGSOCK_Establish failed.");
    exit(1);
  }

  // Forever
  for (;;)
  {
    printf("Attached to port %d, waiting for gdb.\n", PORTNUM);

    // Wait for a connection to occur
    i_currentsocket = fJTAGSOCK_GetConnection(i_socket);
    if (i_currentsocket < 0)
    {
      perror("fJTAGSOCK_GetConnection failed.");
      close(i_socket);
      exit(1);
    }

    // Change the socket to non-blocking
    i_flags = fcntl(i_currentsocket, F_GETFL, 0); 
    i_flags |= O_NONBLOCK;
    fcntl(i_currentsocket, F_SETFL, i_flags); 

    printf("GDB successfully attached.\r\n");

    // Run the GDB Remote Debugging Protocol handler (the guts)
    if (-1 == fGDBRDP_Handler(i_currentsocket))
    {
      printf("JTAGEMUL: User exit!\n");
      close(i_socket);
      close(i_currentsocket);
      return(1);
    }
  }

  // Should never reach here
  close(i_socket);
  close(i_currentsocket);
  return(1);
}