1 /*
2 * Copyright (c) 1983, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
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.
16 *
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
27 * SUCH DAMAGE.
28 */
29 #include "gprof.h"
30 #include "hertz.h"
31
32
33 int
hertz(void)34 hertz (void)
35 {
36 #ifdef HERTZ
37 return HERTZ;
38 #else /* ! defined (HERTZ) */
39 #ifdef HAVE_SETITIMER
40 struct itimerval tim;
41
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)
49 {
50 return 1000000 / tim.it_interval.tv_usec;
51 }
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) */
56 #ifdef __MSDOS__
57 return 18;
58 #else /* ! defined (__MSDOS__) */
59 return HZ_WRONG;
60 #endif /* ! defined (__MSDOS__) */
61 #endif /* ! defined (HAVE_SYSCONF) || ! defined (_SC_CLK_TCK) */
62 #endif /* ! defined (HERTZ) */
63 }
64