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