init version.
[bush.git] / lib / sh / clktck.c
blobc444a361690ad00f6b193924ef24f8d22169e13e
1 /* clktck.c - get the value of CLK_TCK. */
3 /* Copyright (C) 1997 Free Software Foundation, Inc.
5 This file is part of GNU Bush, the Bourne Again SHell.
7 Bush 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.
12 Bush 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.
17 You should have received a copy of the GNU General Public License
18 along with Bush. If not, see <http://www.gnu.org/licenses/>.
21 #include <config.h>
23 #include <bushtypes.h>
24 #if defined (HAVE_SYS_PARAM_H)
25 # include <sys/param.h>
26 #endif
28 #if defined (HAVE_UNISTD_H)
29 # include <unistd.h>
30 #endif
32 #if defined (HAVE_LIMITS_H)
33 # include <limits.h>
34 #endif
36 #if !defined (HAVE_SYSCONF) || !defined (_SC_CLK_TCK)
37 # if !defined (CLK_TCK)
38 # if defined (HZ)
39 # define CLK_TCK HZ
40 # else
41 # define CLK_TCK 60
42 # endif
43 # endif /* !CLK_TCK */
44 #endif /* !HAVE_SYSCONF && !_SC_CLK_TCK */
46 long
47 get_clk_tck ()
49 static long retval = 0;
51 if (retval != 0)
52 return (retval);
54 #if defined (HAVE_SYSCONF) && defined (_SC_CLK_TCK)
55 retval = sysconf (_SC_CLK_TCK);
56 #else /* !SYSCONF || !_SC_CLK_TCK */
57 retval = CLK_TCK;
58 #endif /* !SYSCONF || !_SC_CLK_TCK */
60 return (retval);