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/******************************************************************************

*                                                                             *

* License Agreement                                                           *

*                                                                             *

* Copyright (c) 2004 Altera Corporation, San Jose, California, USA.           *

* All rights reserved.                                                        *

*                                                                             *

* Permission is hereby granted, free of charge, to any person obtaining a     *

* copy of this software and associated documentation files (the "Software"),  *

* to deal in the Software without restriction, including without limitation   *

* the rights to use, copy, modify, merge, publish, distribute, sublicense,    *

* and/or sell copies of the Software, and to permit persons to whom the       *

* Software is furnished to do so, subject to the following conditions:        *

*                                                                             *

* The above copyright notice and this permission notice shall be included in  *

* all copies or substantial portions of the Software.                         *

*                                                                             *

* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR  *

* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,    *

* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE *

* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER      *

* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING     *

* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER         *

* DEALINGS IN THE SOFTWARE.                                                   *

*                                                                             *

* This agreement shall be governed in all respects by the laws of the State   *

* of California and by the laws of the United States of America.              *

*                                                                             *

* Altera does not recommend, suggest or require that this reference design    *

* file be used in conjunction or combination with any other product.          *

******************************************************************************/

#include <sys/times.h>

#include "sys/alt_errno.h"

#include "sys/alt_alarm.h"

#include "os/alt_syscall.h"

/*

 * The times() function is used by newlib to obtain elapsed time information.

 * The return value is the elapsed time since reset in system clock ticks. Note

 * that this is distinct from the strict Posix version of times(), which should

 * return the time since: 0 hours, 0 minutes, 0 seconds, January 1, 1970, GMT.

 *

 * The input structure is filled in with time accounting information. This

 * implementation attributes all cpu time to the system.

 *

 * ALT_TIMES is mapped onto the times() system call in alt_syscall.h

 */

clock_t ALT_TIMES (struct tms *buf)

{

  clock_t ticks = alt_nticks();

  /* If there is no system clock present, generate an error */

  if (!alt_ticks_per_second())

  {

    ALT_ERRNO = ENOSYS;

    return 0;

  }

  /* Otherwise return the elapsed time */

  buf->tms_utime  = 0;

  buf->tms_stime  = ticks;

  buf->tms_cutime = 0;

  buf->tms_cstime = 0;

  return ticks;

}