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acf51e02 TBB |
1 | /* Return frequency of ticks reported by profil. Generic version. */ |
2 | /*- | |
3 | * Copyright (c) 1983, 1992, 1993 | |
4 | * The Regents of the University of California. All rights reserved. | |
5 | * | |
6 | * Redistribution and use in source and binary forms, with or without | |
7 | * modification, are permitted provided that the following conditions | |
8 | * are met: | |
9 | * 1. Redistributions of source code must retain the above copyright | |
edf5b2d7 UD |
10 | * notice, this list of conditions and the following disclaimer. |
11 | * 2. Redistributions in binary form must reproduce the above copyright | |
12 | * notice, this list of conditions and the following disclaimer in the | |
13 | * documentation and/or other materials provided with the distribution. | |
edf5b2d7 UD |
14 | * 4. Neither the name of the University nor the names of its contributors |
15 | * may be used to endorse or promote products derived from this software | |
16 | * without specific prior written permission. | |
17 | * | |
18 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND | |
19 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
20 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
21 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |
22 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
23 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
24 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
25 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
26 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
27 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
28 | * SUCH DAMAGE. | |
29 | */ | |
30 | ||
31 | ||
32 | #include <sys/types.h> | |
33 | #include <sys/time.h> | |
66539a73 | 34 | #include <libc-internal.h> |
edf5b2d7 UD |
35 | |
36 | int | |
d68171ed | 37 | __profile_frequency (void) |
edf5b2d7 UD |
38 | { |
39 | /* | |
40 | * Discover the tick frequency of the machine if something goes wrong, | |
41 | * we return 0, an impossible hertz. | |
42 | */ | |
43 | struct itimerval tim; | |
44 | ||
45 | tim.it_interval.tv_sec = 0; | |
46 | tim.it_interval.tv_usec = 1; | |
47 | tim.it_value.tv_sec = 0; | |
48 | tim.it_value.tv_usec = 0; | |
50304ef0 UD |
49 | __setitimer(ITIMER_REAL, &tim, 0); |
50 | __setitimer(ITIMER_REAL, 0, &tim); | |
edf5b2d7 UD |
51 | if (tim.it_interval.tv_usec < 2) |
52 | return 0; | |
53 | return (1000000 / tim.it_interval.tv_usec); | |
54 | } | |
37ba7d66 | 55 | libc_hidden_def (__profile_frequency) |