1 /* $OpenBSD: hertz.c,v 1.7 2015/01/16 06:40:08 deraadt 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/time.h> 21 #include <sys/sysctl.h> 22 23 #include "gprof.h" 24 25 /* 26 * Return the tick frequency on the machine or 0 if we can't find out. 27 */ 28 29 int 30 hertz(void) 31 { 32 struct clockinfo cinfo; 33 int mib[2]; 34 size_t len; 35 36 mib[0] = CTL_KERN; 37 mib[1] = KERN_CLOCKRATE; 38 len = sizeof(cinfo); 39 if (sysctl(mib, 2, &cinfo, &len, NULL, 0) == -1) 40 return (0); 41 42 return (cinfo.hz); 43 } 44