sysdeps/posix/clock.c

   1 /* Copyright (C) 1991, 1992 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 Library General Public License as
   6 published by the Free Software Foundation; either version 2 of the
   7 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 Library General Public License for more details.
  13
  14 You should have received a copy of the GNU Library General Public
  15 License along with the GNU C Library; see the file COPYING.LIB.  If
  16 not, write to the Free Software Foundation, Inc., 675 Mass Ave,
  17 Cambridge, MA 02139, USA.  */
  18
  19 #include <ansidecl.h>
  20 #include <sys/times.h>
  21 #include <time.h>
  22
  23 /* Return the time used by the program so far (user time + system time).  */
  24 clock_t
  25 DEFUN_VOID(clock)
  26 {
  27   struct tms buf;
  28
  29   if (__times(&buf) < 0)
  30     return (clock_t) -1;
  31
  32   return ((buf.tms_utime + buf.tms_stime) * CLK_TCK * CLOCKS_PER_SEC);
  33 }