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
hertz(void)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