/*
   orxonox - the future of 3D-vertical-scrollers

   Copyright (C) 2004 orx

   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, or (at your option)
   any later version.

### File Specific:
   main-programmer: Christoph Renner
   co-programmer: ...
*/

#include "signal_handler.h"
#include <assert.h>

#ifdef __LINUX__

SignalHandler * SignalHandler::singletonRef = NULL;

SignalHandler::SignalHandler()
{
}

void SignalHandler::doCatch( std::string appName, GdbRunType type )
{
  this->type = type;
  this->appName = appName;

  catchSignal( SIGSEGV );
  catchSignal( SIGABRT );
}

void SignalHandler::dontCatch()
{
  for ( SignalRecList::iterator it = sigRecList.begin(); it != sigRecList.end(); it++ )
  {
    signal( it->signal, it->handler );
  }

  sigRecList.clear();
}

void SignalHandler::catchSignal( int sig )
{
  sig_t handler = signal( sig, SignalHandler::sigHandler );

  assert( handler != SIG_ERR );

  SignalRec rec;
  rec.signal = sig;
  rec.handler = handler;

  sigRecList.push_front( rec );
}

void SignalHandler::sigHandler( int sig )
{

  std::string sigName = "UNKNOWN";
  
  switch ( sig )
  {
    case SIGSEGV:
      sigName = "SIGSEGV";
      break;
    case SIGABRT:
      sigName = "SIGABRT";
      break;
  }

  printf( "recieved signal %s\ntry to write backtrace to file orxonox.backtrace\n", sigName.c_str() );

  int fd[2];

  assert( pipe(fd) != -1 );

  int pid = fork();

  assert( pid != -1 );

  if ( pid == 0 )
  {
	getInstance()->dontCatch();	
    sleep(2);

    return;
  }
  else
  {
    if ( getInstance()->type == GDB_RUN_WRITE_TO_FILE && fork() == 0 )
    {
      sleep(1);
      write( fd[1], "c\nbt\nq\n", 7 );

      exit(0);
    }

    char command[256];
    if ( getInstance()->type == GDB_RUN_WRITE_TO_FILE )
    {
      dup2( fd[0], STDIN_FILENO );
      snprintf( command, 255, "gdb -p %d %s 1>" GDB_BT_FILE " 2>&1", pid, getInstance()->appName.c_str() );
    }
    else
      snprintf( command, 255, "gdb -p %d %s", pid, getInstance()->appName.c_str() );
    execlp( "sh", "sh", "-c", command, (void*)NULL);
  }
}

#endif /* __WIN32__ */