sysdeps/posix/clock.c

   1 /* Copyright (C) 1991, 1992, 1997 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, see
  16    <http://www.gnu.org/licenses/>.  */
  17
  18 #include <sys/times.h>
  19 #include <time.h>
  20
  21 /* Return the time used by the program so far (user time + system time).  */
  22 clock_t
  23 clock ()
  24 {
  25   struct tms buf;
  26
  27   if (__times (&buf) < 0)
  28     return (clock_t) -1;
  29
  30   return buf.tms_utime + buf.tms_stime;
  31 }