projects / unix-history / blame
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1 | /* |
| 2 | * Copyright (c) 1989 The Regents of the University of California. | |
| 3 | * All rights reserved. | |
| 4 | * | |
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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. All advertising materials mentioning features or use of this software | |
| 14 | * must display the following acknowledgement: | |
| 15 | * This product includes software developed by the University of | |
| 16 | * California, Berkeley and its contributors. | |
| 17 | * 4. Neither the name of the University nor the names of its contributors | |
| 18 | * may be used to endorse or promote products derived from this software | |
| 19 | * without specific prior written permission. | |
| 20 | * | |
| 21 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND | |
| 22 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
| 23 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
| 24 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |
| 25 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
| 26 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
| 27 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
| 28 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
| 29 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
| 30 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
| 31 | * SUCH DAMAGE. | |
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32 | */ |
| 33 | ||
| 34 | #if defined(LIBC_SCCS) && !defined(lint) | |
| af359dea | 35 | static char sccsid[] = "@(#)clock.c 5.4 (Berkeley) 8/27/90"; |
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36 | #endif /* LIBC_SCCS and not lint */ |
| 37 | ||
| 428b8f00 | 38 | #include <sys/param.h> |
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39 | #include <sys/time.h> |
| 40 | #include <sys/resource.h> | |
| 41 | ||
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42 | /* |
| 43 | * Convert usec to clock ticks; could do (usec * CLK_TCK) / 1000000, | |
| 44 | * but this would overflow if we switch to nanosec. | |
| 45 | */ | |
| 46 | #define CONVTCK(r) (r.tv_sec * CLK_TCK + r.tv_usec / (1000000 / CLK_TCK)) | |
| 47 | ||
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48 | clock_t |
| 49 | clock() | |
| 50 | { | |
| 428b8f00 | 51 | struct rusage ru; |
| 93d75995 | 52 | |
| 428b8f00 | 53 | if (getrusage(RUSAGE_SELF, &ru)) |
| 675fd207 | 54 | return ((clock_t) -1); |
| 428b8f00 | 55 | return((clock_t)((CONVTCK(ru.ru_utime) + CONVTCK(ru.ru_stime)))); |
| 93d75995 | 56 | } |