| 1 | /*
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| 2 | * Copyright (c) 1983, 1993
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| 3 | * The Regents of the University of California. All rights reserved.
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| 4 | *
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| 5 | * Redistribution and use in source and binary forms, with or without
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| 6 | * modification, are permitted provided that the following conditions
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| 7 | * are met:
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| 8 | * 1. Redistributions of source code must retain the above copyright
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| 9 | * notice, this list of conditions and the following disclaimer.
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| 10 | * 2. Redistributions in binary form must reproduce the above copyright
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| 11 | * notice, this list of conditions and the following disclaimer in the
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| 12 | * documentation and/or other materials provided with the distribution.
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| 13 | * 3. Neither the name of the University nor the names of its contributors
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| 14 | * may be used to endorse or promote products derived from this software
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| 15 | * without specific prior written permission.
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| 16 | *
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| 17 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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| 18 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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| 19 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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| 20 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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| 21 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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| 22 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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| 23 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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| 24 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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| 25 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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| 26 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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| 27 | * SUCH DAMAGE.
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| 28 | */
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| 29 | #include "gprof.h"
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| 30 | #include "hertz.h"
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| 31 |
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| 32 |
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| 33 | int
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| 34 | hertz ()
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| 35 | {
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| 36 | #ifdef HERTZ
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| 37 | return HERTZ;
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| 38 | #else /* ! defined (HERTZ) */
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| 39 | #ifdef HAVE_SETITIMER
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| 40 | struct itimerval tim;
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| 41 |
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| 42 | tim.it_interval.tv_sec = 0;
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| 43 | tim.it_interval.tv_usec = 1;
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| 44 | tim.it_value.tv_sec = 0;
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| 45 | tim.it_value.tv_usec = 0;
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| 46 | setitimer (ITIMER_REAL, &tim, 0);
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| 47 | setitimer (ITIMER_REAL, 0, &tim);
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| 48 | if (tim.it_interval.tv_usec >= 2)
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| 49 | {
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| 50 | return 1000000 / tim.it_interval.tv_usec;
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| 51 | }
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| 52 | #endif /* ! defined (HAVE_SETITIMER) */
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| 53 | #if defined (HAVE_SYSCONF) && defined (_SC_CLK_TCK)
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| 54 | return sysconf (_SC_CLK_TCK);
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| 55 | #else /* ! defined (HAVE_SYSCONF) || ! defined (_SC_CLK_TCK) */
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| 56 | #ifdef __MSDOS__
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| 57 | return 18;
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| 58 | #else /* ! defined (__MSDOS__) */
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| 59 | return HZ_WRONG;
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| 60 | #endif /* ! defined (__MSDOS__) */
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| 61 | #endif /* ! defined (HAVE_SYSCONF) || ! defined (_SC_CLK_TCK) */
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| 62 | #endif /* ! defined (HERTZ) */
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| 63 | }
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