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 it under
8   the terms of the GNU General Public License as published by the Free
9   Software Foundation; either version 2, or (at your option) any later
10   version.
11
12   Bash is distributed in the hope that it will be useful, but WITHOUT ANY
13   WARRANTY; without even the implied warranty of MERCHANTABILITY or
14   FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
15   for more details.
16
17   You should have received a copy of the GNU General Public License along
18   with Bash; see the file COPYING.  If not, write to the Free Software
19   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA */
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
44long
45get_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}
60