Windows Overlapped Read할때 Timeout구현 문제...

int readStdout(char *pbuffer, int bufsize, DWORD *pdwReadLen, DWORD dwTimeout)
{
	const DWORD PollInterval = 100;
 
	int retval = 0;
 
	DWORD dwWaitRst;
	BOOL bRst;
	DWORD dwErr;
 
	BOOL bIoComplete = FALSE;
	DWORD waitTimer;
 
	OVERLAPPED ov = {0};
 
	ov.hEvent = m_hStdoutRdEvent;
 
	bRst = ReadFile(m_hStdoutRd, pbuffer, bufsize, pdwReadLen, &ov);
	if(!bRst)
	{
		do {
			dwErr = GetLastError();
			if(dwErr != ERROR_IO_PENDING)
			{
				retval = -((int)dwErr);
				break;
			}
			dwWaitRst = WaitForSingleObject(m_hStdoutRdEvent, dwTimeout);
			if(dwWaitRst == WAIT_OBJECT_0)
			{
				bRst = GetOverlappedResult(m_hStdoutRdEvent, &m_comm_StdoutOverlapped, pdwReadLen, FALSE);
				if(bRst)
				{
					retval = 1;
				}else{
					dwErr = GetLastError();
					retval = -((int)dwErr);
				}
			}else if(dwWaitRst == WAIT_TIMEOUT)
			{
				retval = 0;
			}else{
				dwErr = GetLastError();
				retval = -((int)dwErr);
			}
		}while(0);
	}else{
		retval = 1;
	}
 
	return retval;
}