ptw32_threadstart.c

很有名的一款用于组织DDoS的恶意机器人程序。仅供研究学习

/*
 * ptw32_threadStart.c
 *
 * Description:
 * This translation unit implements routines which are private to
 * the implementation and may be used throughout it.
 *
 * --------------------------------------------------------------------------
 *
 *      Pthreads-win32 - POSIX Threads Library for Win32
 *      Copyright(C) 1998 John E. Bossom
 *      Copyright(C) 1999,2003 Pthreads-win32 contributors
 * 
 *      Contact Email: [e-mail]
 * 
 *      The current list of contributors is contained
 *      in the file CONTRIBUTORS included with the source
 *      code distribution. The list can also be seen at the
 *      following World Wide Web location:
 *      http://sources.redhat.com/pthreads-win32/contributors.html
 * 
 *      This library is free software; you can redistribute it and/or
 *      modify it under the terms of the GNU Lesser General Public
 *      License as published by the Free Software Foundation; either
 *      version 2 of the License, or (at your option) any later version.
 * 
 *      This library 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
 *      Lesser General Public License for more details.
 * 
 *      You should have received a copy of the GNU Lesser General Public
 *      License along with this library in the file COPYING.LIB;
 *      if not, write to the Free Software Foundation, Inc.,
 *      59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
 */

#include "pthread.h"
#include "implement.h"


#ifdef __CLEANUP_SEH

static DWORD
ExceptionFilter (EXCEPTION_POINTERS * ep, DWORD * ei)
{
  switch (ep->ExceptionRecord->ExceptionCode)
    {
      case EXCEPTION_PTW32_SERVICES:
	{
	  DWORD param;
	  DWORD numParams = ep->ExceptionRecord->NumberParameters;

	  numParams = (numParams > 3) ? 3 : numParams;

	  for (param = 0; param < numParams; param++)
	    {
	      ei[param] = ep->ExceptionRecord->ExceptionInformation[param];
	    }

	  return EXCEPTION_EXECUTE_HANDLER;
	  break;
	}
      default:
	{
	  /*
	   * A system unexpected exception has occurred running the user's
	   * routine. We need to cleanup before letting the exception
	   * out of thread scope.
	   */
	  pthread_t self = pthread_self();

	  (void) pthread_mutex_destroy(&self->cancelLock);
	  ptw32_callUserDestroyRoutines(self);

	  return EXCEPTION_CONTINUE_SEARCH;
	  break;
	}
    }
}

#elif defined(__CLEANUP_CXX)

#if defined(_MSC_VER)
# include <eh.h>
#else
# if defined(__GNUC__) && __GNUC__ < 3
#   include <new.h>
# else
#   include <new>
    using std::terminate_handler;
    using std::terminate;
    using std::set_terminate;
# endif
  typedef terminate_handler terminate_function;
#endif

static terminate_function ptw32_oldTerminate;

void
ptw32_terminate ()
{
  pthread_t self = pthread_self();
  set_terminate(ptw32_oldTerminate);
  (void) pthread_mutex_destroy(&self->cancelLock);
  ptw32_callUserDestroyRoutines(self);
  terminate();
}

#endif

#if ! defined (__MINGW32__) || defined (__MSVCRT__)
unsigned __stdcall
#else
void
#endif
ptw32_threadStart (void * vthreadParms)
{
  ThreadParms *threadParms = (ThreadParms *) vthreadParms;
  pthread_t self;
  void *(*start) (void *);
  void *arg;

#ifdef __CLEANUP_SEH
  DWORD ei[] = {0,0,0};
#endif

#ifdef __CLEANUP_C
  int setjmp_rc;
#endif

  void * status = (void *) 0;

  self = threadParms->tid;
  start = threadParms->start;
  arg = threadParms->arg;

  free (threadParms);

#if defined (__MINGW32__) && ! defined (__MSVCRT__)
  /*
   * beginthread does not return the thread id and is running
   * before it returns us the thread handle, and so we do it here.
   */
  self->thread = GetCurrentThreadId ();
  /*
   * Here we're using cancelLock as a general-purpose lock
   * to make the new thread wait until the creating thread
   * has the new handle.
   */
  if (pthread_mutex_lock(&self->cancelLock) == 0)
    {
      (void) pthread_mutex_unlock(&self->cancelLock);
    }
#endif

  pthread_setspecific (ptw32_selfThreadKey, self);

  self->state = PThreadStateRunning;

#ifdef __CLEANUP_SEH

  __try
  {
    /*
     * Run the caller's routine;
     */
    status = self->exitStatus = (*start) (arg);

#ifdef _UWIN
	if (--pthread_count <= 0)
		exit(0);
#endif

  }
  __except (ExceptionFilter(GetExceptionInformation(), ei))
  {
     switch (ei[0])
       {
	case PTW32_EPS_CANCEL:
	  status = PTHREAD_CANCELED;
#ifdef _UWIN
		if (--pthread_count <= 0)
			exit(0);
#endif
	  break;
	case PTW32_EPS_EXIT:
	  status = self->exitStatus;
	  break;
	default:
	  status = PTHREAD_CANCELED;
	  break;
       }
  }

#else /* __CLEANUP_SEH */

#ifdef __CLEANUP_C

  setjmp_rc = setjmp( self->start_mark );

  if( 0 == setjmp_rc ) {

	  /*
	   * Run the caller's routine;
	   */
	  status = self->exitStatus = (*start) (arg);
  }

  else {

     switch (setjmp_rc)
       {
	case PTW32_EPS_CANCEL:
	  status = PTHREAD_CANCELED;
	  break;
	case PTW32_EPS_EXIT:
	  status = self->exitStatus;
	  break;
	default:
	  status = PTHREAD_CANCELED;
	  break;
       }
  }

#else /* __CLEANUP_C */

#ifdef __CLEANUP_CXX

  ptw32_oldTerminate = set_terminate(&ptw32_terminate);

  try
  {
    /*
     * Run the caller's routine in a nested try block so that we
     * can run the user's terminate function, which may call
     * pthread_exit() or be canceled.
     */
    try
      {
	status = self->exitStatus = (*start) (arg);
      }
    catch (ptw32_exception &)
      {
	/*
	 * Pass these through to the outer block.
	 */
	throw;
      }
    catch(...)
     {
       /*
	* We want to run the user's terminate function if supplied.
	* That function may call pthread_exit() or be canceled, which will
	* be handled by the outer try block.
	*
	* ptw32_terminate() will be called if there is no user
	* supplied function.
	*/

       terminate_function term_func = set_terminate(0);
       set_terminate(term_func);

       if (term_func != 0) {
	   term_func();
       }

       throw;
     }
  }
  catch (ptw32_exception_cancel &)
    {
      /*
       * Thread was canceled.
       */
      status = self->exitStatus = PTHREAD_CANCELED;
    }
  catch (ptw32_exception_exit &)
    {
      /*
       * Thread was exited via pthread_exit().
       */
      status = self->exitStatus;
    }
  catch (...)
    {
      /*
       * A system unexpected exception has occurred running the user's
       * terminate routine. We get control back within this block - cleanup
       * and release the exception out of thread scope.
       */
      status = self->exitStatus = PTHREAD_CANCELED;
      (void) pthread_mutex_lock(&self->cancelLock);
      self->state = PThreadStateException;
      (void) pthread_mutex_unlock(&self->cancelLock);
      (void) pthread_mutex_destroy(&self->cancelLock);
      (void) set_terminate(ptw32_oldTerminate);
      ptw32_callUserDestroyRoutines(self);
      throw;

      /*
       * Never reached.
       */
    }

  (void) set_terminate(ptw32_oldTerminate);

#else

#error ERROR [__FILE__, line __LINE__]: Cleanup type undefined.

#endif /* __CLEANUP_CXX */
#endif /* __CLEANUP_C */
#endif /* __CLEANUP_SEH */

  if (self->detachState == PTHREAD_CREATE_DETACHED)
    {
      /*
       * We need to cleanup the pthread now in case we have
       * been statically linked, in which case the cleanup
       * in dllMain won't get done. Joinable threads will
       * be cleaned up by pthread_join().
       *
       * Note that implicitly created pthreads (those created
       * for Win32 threads which have called pthreads routines)
       * must be cleaned up explicitly by the application
       * (by calling pthread_win32_thread_detach_np()) if
       * this library has been statically linked. For the dll,
       * dllMain will do the cleanup automatically.
       */
      (void) pthread_win32_thread_detach_np ();
    }
  else
    {
      ptw32_callUserDestroyRoutines (self);
    }

#if ! defined (__MINGW32__) || defined (__MSVCRT__)
  _endthreadex ((unsigned) status);
#else
  _endthread ();
#endif

  /*
   * Never reached.
   */

#if ! defined (__MINGW32__) || defined (__MSVCRT__)
  return (unsigned) status;
#endif

}				/* ptw32_threadStart */