* Copyright (c) 1983 Regents of the University of California.
* Redistribution and use in source and binary forms are permitted
* provided that the above copyright notice and this paragraph are
* duplicated in all such forms and that any documentation,
* advertising materials, and other materials related to such
* distribution and use acknowledge that the software was developed
* by the University of California, Berkeley. The name of the
* University may not be used to endorse or promote products derived
* from this software without specific prior written permission.
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
static char sccsid
[] = "@(#)hertz.c 5.3 (Berkeley) %G%";
* discover the tick frequency of the machine
* if something goes wrong, we return 0, an impossible hertz.
tim
.it_interval
.tv_sec
= 0;
tim
.it_interval
.tv_usec
= 1;
tim
.it_value
.tv_usec
= 0;
setitimer(ITIMER_REAL
, &tim
, 0);
setitimer(ITIMER_REAL
, 0, &tim
);
if (tim
.it_interval
.tv_usec
< 2)
return (1000000 / tim
.it_interval
.tv_usec
);