1 /* $OpenBSD: hertz.c,v 1.6 2006/03/25 19:06:36 espie Exp $ */ 2 3 /* 4 * Copyright (c) 2005 Artur Grabowski <art@openbsd.org> 5 * 6 * Permission to use, copy, modify, and distribute this software for any 7 * purpose with or without fee is hereby granted, provided that the above 8 * copyright notice and this permission notice appear in all copies. 9 * 10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 17 */ 18 19 20 #include <sys/param.h> 21 #include <sys/time.h> 22 #include <sys/sysctl.h> 23 24 #include "gprof.h" 25 26 /* 27 * Return the tick frequency on the machine or 0 if we can't find out. 28 */ 29 30 int 31 hertz(void) 32 { 33 struct clockinfo cinfo; 34 int mib[2]; 35 size_t len; 36 37 mib[0] = CTL_KERN; 38 mib[1] = KERN_CLOCKRATE; 39 len = sizeof(cinfo); 40 if (sysctl(mib, 2, &cinfo, &len, NULL, 0) == -1) 41 return (0); 42 43 return (cinfo.hz); 44 } 45