/* Return the time used by the program so far (user time + system time).

   Copyright (C) 1991-2018 Free Software Foundation, Inc.

   This file is part of the GNU C Library.

   The GNU C 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 2.1 of the License, or (at your option) any later version.

   The GNU C 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 the GNU C Library; if not, see

   <http://www.gnu.org/licenses/>.  */

#include <sys/times.h>

#include <time.h>

#include <unistd.h>

clock_t

clock (void)

{

  struct timespec ts;

  _Static_assert (CLOCKS_PER_SEC == 1000000,

		  "CLOCKS_PER_SEC should be 1000000");

  /* clock_gettime shouldn't fail here since CLOCK_PROCESS_CPUTIME_ID is

     supported since 2.6.12.  Check the return value anyway in case the kernel

     barfs on us for some reason.  */

  if (__glibc_unlikely (__clock_gettime (CLOCK_PROCESS_CPUTIME_ID, &ts) != 0))

    return (clock_t) -1;

  return (ts.tv_sec * CLOCKS_PER_SEC

	  + ts.tv_nsec / (1000000000 / CLOCKS_PER_SEC));

}