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.
27 #else /* ! defined (HERTZ) */
31 tim
.it_interval
.tv_sec
= 0;
32 tim
.it_interval
.tv_usec
= 1;
33 tim
.it_value
.tv_sec
= 0;
34 tim
.it_value
.tv_usec
= 0;
35 setitimer (ITIMER_REAL
, &tim
, 0);
36 setitimer (ITIMER_REAL
, 0, &tim
);
37 if (tim
.it_interval
.tv_usec
>= 2)
39 return 1000000 / tim
.it_interval
.tv_usec
;
41 #endif /* ! defined (HAVE_SETITIMER) */
42 #if defined (HAVE_SYSCONF) && defined (_SC_CLK_TCK)
43 return sysconf (_SC_CLK_TCK
);
44 #else /* ! defined (HAVE_SYSCONF) || ! defined (_SC_CLK_TCK) */
47 #else /* ! defined (__MSDOS__) */
49 #endif /* ! defined (__MSDOS__) */
50 #endif /* ! defined (HAVE_SYSCONF) || ! defined (_SC_CLK_TCK) */
51 #endif /* ! defined (HERTZ) */
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