projects / apple / libc.git / blame
| Commit | Line | Data |
|---|---|---|
| e9ce8d39 | 1 | /* |
| 5b2abdfb | 2 | * Copyright (c) 1989, 1993 |
| e9ce8d39 A |
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. | |
| e9ce8d39 A |
13 | * 4. 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 | ||
| 5b2abdfb | 30 | #if defined(LIBC_SCCS) && !defined(lint) |
| 9385eb3d | 31 | static char sccsid[] = "@(#)clock.c 8.1 (Berkeley) 6/4/93"; |
| 5b2abdfb | 32 | #endif /* LIBC_SCCS and not lint */ |
| 9385eb3d | 33 | #include <sys/cdefs.h> |
| 1f2f436a | 34 | __FBSDID("$FreeBSD: src/lib/libc/gen/clock.c,v 1.4 2007/01/09 00:27:53 imp Exp $"); |
| e9ce8d39 | 35 | |
| 9385eb3d A |
36 | #include <sys/param.h> |
| 37 | #include <sys/time.h> | |
| 38 | #include <sys/resource.h> | |
| e9ce8d39 | 39 | |
| 9385eb3d A |
40 | /* |
| 41 | * Convert usec to clock ticks; could do (usec * CLOCKS_PER_SEC) / 1000000, | |
| 42 | * but this would overflow if we switch to nanosec. | |
| 43 | */ | |
| 44 | #define CONVTCK(r) ((r).tv_sec * CLOCKS_PER_SEC \ | |
| 45 | + (r).tv_usec / (1000000 / CLOCKS_PER_SEC)) | |
| 46 | ||
| 47 | clock_t | |
| 48 | clock() | |
| e9ce8d39 | 49 | { |
| 9385eb3d | 50 | struct rusage ru; |
| 5b2abdfb | 51 | |
| 9385eb3d A |
52 | if (getrusage(RUSAGE_SELF, &ru)) |
| 53 | return ((clock_t) -1); | |
| 54 | return((clock_t)((CONVTCK(ru.ru_utime) + CONVTCK(ru.ru_stime)))); | |
| e9ce8d39 | 55 | } |