lib/sh/clktck.c

   1 /* clktck.c - get the value of CLK_TCK. */
   2
   3 /* Copyright (C) 1997 Free Software Foundation, Inc.
   4
   5    This file is part of GNU Bash, the Bourne Again SHell.
   6
   7    Bash is free software: you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation, either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    Bash is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with Bash.  If not, see <http://www.gnu.org/licenses/>.
  19 */
  20
  21 #include <config.h>
  22
  23 #include <bashtypes.h>
  24 #include <sys/param.h>
  25
  26 #if defined (HAVE_UNISTD_H)
  27 #  include <unistd.h>
  28 #endif
  29
  30 #if defined (HAVE_LIMITS_H)
  31 #  include <limits.h>
  32 #endif
  33
  34 #if !defined (HAVE_SYSCONF) || !defined (_SC_CLK_TCK)
  35 #  if !defined (CLK_TCK)
  36 #    if defined (HZ)
  37 #      define CLK_TCK HZ
  38 #    else
  39 #      define CLK_TCK 60
  40 #    endif
  41 #  endif /* !CLK_TCK */
  42 #endif /* !HAVE_SYSCONF && !_SC_CLK_TCK */
  43
  44 long
  45 get_clk_tck ()
  46 {
  47   static long retval = 0;
  48
  49   if (retval != 0)
  50     return (retval);
  51
  52 #if defined (HAVE_SYSCONF) && defined (_SC_CLK_TCK)
  53   retval = sysconf (_SC_CLK_TCK);
  54 #else /* !SYSCONF || !_SC_CLK_TCK */
  55   retval = CLK_TCK;
  56 #endif /* !SYSCONF || !_SC_CLK_TCK */
  57
  58   return (retval);
  59 }