2 * Copyright (c) 1983, 1993
3 * The Regents of the University of California. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
38 #else /* ! defined (HERTZ) */
42 tim
.it_interval
.tv_sec
= 0;
43 tim
.it_interval
.tv_usec
= 1;
44 tim
.it_value
.tv_sec
= 0;
45 tim
.it_value
.tv_usec
= 0;
46 setitimer (ITIMER_REAL
, &tim
, 0);
47 setitimer (ITIMER_REAL
, 0, &tim
);
48 if (tim
.it_interval
.tv_usec
>= 2)
50 return 1000000 / tim
.it_interval
.tv_usec
;
52 #endif /* ! defined (HAVE_SETITIMER) */
53 #if defined (HAVE_SYSCONF) && defined (_SC_CLK_TCK)
54 return sysconf (_SC_CLK_TCK
);
55 #else /* ! defined (HAVE_SYSCONF) || ! defined (_SC_CLK_TCK) */
58 #else /* ! defined (__MSDOS__) */
60 #endif /* ! defined (__MSDOS__) */
61 #endif /* ! defined (HAVE_SYSCONF) || ! defined (_SC_CLK_TCK) */
62 #endif /* ! defined (HERTZ) */
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