libf2c/libU77/sys_clock_.c

   1 /* Copyright (C) 1996, 1998, 2001 Free Software Foundation, Inc.
   2 This file is part of GNU Fortran libU77 library.
   3
   4 This library is free software; you can redistribute it and/or modify it
   5 under the terms of the GNU Library General Public License as published
   6 by the Free Software Foundation; either version 2 of the License, or
   7 (at your option) any later version.
   8
   9 GNU Fortran 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 GNU Fortran; see the file COPYING.LIB.  If
  16 not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  17 Boston, MA 02111-1307, USA.  */
  18
  19 #ifdef HAVE_CONFIG_H
  20 #include "config.h"
  21 #endif
  22 #include <sys/types.h>
  23 #if HAVE_SYS_PARAM_H
  24 # include <sys/param.h>
  25 #endif
  26 #if TIME_WITH_SYS_TIME
  27 # include <sys/time.h>
  28 # include <time.h>
  29 #else
  30 # if HAVE_SYS_TIME_H
  31 #  include <sys/time.h>
  32 # else
  33 #  include <time.h>
  34 # endif
  35 #endif
  36 #if HAVE_SYS_TIMES_H
  37 #  include <sys/times.h>
  38 #endif
  39 #include <limits.h>
  40 #if HAVE_UNISTD_H
  41 #  include <unistd.h>
  42 #endif
  43 #include <errno.h>              /* for ENOSYS */
  44 #include "f2c.h"
  45
  46 int
  47 G77_system_clock_0 (integer * count, integer * count_rate,
  48                     integer * count_max)
  49 {
  50 #if defined (HAVE_TIMES)
  51   struct tms buffer;
  52   unsigned long cnt;
  53   if (count_rate)
  54     {
  55 #ifdef _SC_CLK_TCK
  56       *count_rate = sysconf (_SC_CLK_TCK);
  57 #elif defined CLOCKS_PER_SECOND
  58       *count_rate = CLOCKS_PER_SECOND;
  59 #elif defined CLK_TCK
  60       *count_rate = CLK_TCK;
  61 #elif defined HZ
  62       *count_rate = HZ;
  63 #else
  64 #error Dont know clock tick length
  65 #endif
  66     }
  67   if (count_max)                /* optional arg present? */
  68     *count_max = INT_MAX;       /* dubious */
  69   cnt = times (&buffer);
  70   if (cnt > (unsigned long) (INT_MAX))
  71     *count = INT_MAX;           /* also dubious */
  72   else
  73     *count = cnt;
  74   return 0;
  75 #else /* ! HAVE_TIMES */
  76   errno = ENOSYS;
  77   return -1;
  78 #endif /* ! HAVE_TIMES */
  79 }