2 * Copyright (c) 1983 Regents of the University of California.
5 * Redistribution and use in source and binary forms are permitted
6 * provided that: (1) source distributions retain this entire copyright
7 * notice and comment, and (2) distributions including binaries display
8 * the following acknowledgement: ``This product includes software
9 * developed by the University of California, Berkeley and its contributors''
10 * in the documentation or other materials provided with the distribution
11 * and in all advertising materials mentioning features or use of this
12 * software. Neither the name of the University nor the names of its
13 * contributors may be used to endorse or promote products derived
14 * from this software without specific prior written permission.
15 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
17 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
21 static char sccsid
[] = "@(#)hertz.c 5.4 (Berkeley) 6/1/90";
27 * discover the tick frequency of the machine
28 * if something goes wrong, we return 0, an impossible hertz.
36 tim
.it_interval
.tv_sec
= 0;
37 tim
.it_interval
.tv_usec
= 1;
38 tim
.it_value
.tv_sec
= 0;
39 tim
.it_value
.tv_usec
= 0;
40 setitimer(ITIMER_REAL
, &tim
, 0);
41 setitimer(ITIMER_REAL
, 0, &tim
);
42 if (tim
.it_interval
.tv_usec
< 2)
44 return (1000000 / tim
.it_interval
.tv_usec
);
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