text: // Copyright(c) 2017, Intel Corporation
  //
  // 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 Intel Corporation  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.
  
  #ifdef HAVE_CONFIG_H
  #include <config.h>
  #endif // HAVE_CONFIG_H
  
  #include <opae/access.h>
  #include <opae/properties.h>
  #include "common_int.h"
  #include "ase_common.h"
  
  fpga_result __FPGA_API__ ase_fpgaCreateEventHandle(fpga_event_handle *handle)
  {
  	struct _fpga_event_handle *_eh;
  
  	if (!handle)
  		return FPGA_INVALID_PARAM;
  
  	_eh = ase_malloc(sizeof(struct _fpga_event_handle));
  	if (NULL == _eh) {
  		FPGA_ERR("Could not allocate memory for event handle");
  		return FPGA_NO_MEMORY;
  	}
  
  	/* create eventfd */
  	_eh->fd = eventfd(0, 0);
  	if (_eh->fd < 0) {
  		FPGA_ERR("eventfd : %s", strerror(errno));
  		free(_eh);
  		_eh = NULL;
  		return FPGA_NOT_FOUND;
  	}
  
  	*handle = (fpga_event_handle)_eh;
  	return FPGA_OK;
  }
  
  fpga_result __FPGA_API__ ase_fpgaDestroyEventHandle(fpga_event_handle *handle)
  {
  	struct _fpga_event_handle *_eh;
  	if (!handle)
  		return FPGA_INVALID_PARAM;
  
  	_eh = (struct _fpga_event_handle *) *handle;
  
  	if (NULL == _eh) {
  		FPGA_ERR("Received NULL event handle");
  		return FPGA_INVALID_PARAM;
  	}
  
  	if (close(_eh->fd) < 0) {
  		FPGA_ERR("eventfd : %s", strerror(errno));
  		if (errno == EBADF)
  			return FPGA_INVALID_PARAM;
  		else
  			return FPGA_EXCEPTION;
  	}
  
  	free(*handle);
  	*handle = NULL;
  	return FPGA_OK;
  }
  
  fpga_result __FPGA_API__ ase_fpgaGetOSObjectFromEventHandle(const fpga_event_handle eh,
  						int *fd)
  {
  	struct _fpga_event_handle *_eh = (struct _fpga_event_handle *) eh;
  	if (NULL == _eh) {
  		FPGA_ERR("Event handle is null");
  		return FPGA_INVALID_PARAM;
  	}
  
  	*fd = _eh->fd;
  
  	return FPGA_OK;
  }
  
  fpga_result __FPGA_API__ ase_fpgaRegisterEvent(fpga_handle handle,
  					   fpga_event_type type,
  					   fpga_event_handle event_handle,
  					   uint32_t flags)
  {
  	UNUSED_PARAM(handle);
  	if (type != FPGA_EVENT_INTERRUPT)
  		return FPGA_NOT_SUPPORTED;
  
  	if (flags >= MAX_USR_INTRS)
  		return FPGA_INVALID_PARAM;
  
  	if (register_event(FILE_DESCRIPTOR(event_handle), flags) == 0)
  		return FPGA_OK;
  	else
  		return FPGA_EXCEPTION;
  }
  
  fpga_result __FPGA_API__ ase_fpgaUnregisterEvent(fpga_handle handle,
  					     fpga_event_type event_type,
  					     fpga_event_handle event_handle)
  {
  	UNUSED_PARAM(handle);
  	if (event_type != FPGA_EVENT_INTERRUPT)
  		return FPGA_NOT_SUPPORTED;
  
  	if (unregister_event(FILE_DESCRIPTOR(event_handle)) == 0)
  		return FPGA_OK;
  	else
  		return FPGA_EXCEPTION;
  }
  