projects / apple / security.git / blame
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|---|---|---|
| b1ab9ed8 A |
1 | /* |
| 2 | * Copyright (c) 2000-2001,2003-2004 Apple Computer, Inc. All Rights Reserved. | |
| 3 | * | |
| 4 | * @APPLE_LICENSE_HEADER_START@ | |
| 5 | * | |
| 6 | * This file contains Original Code and/or Modifications of Original Code | |
| 7 | * as defined in and that are subject to the Apple Public Source License | |
| 8 | * Version 2.0 (the 'License'). You may not use this file except in | |
| 9 | * compliance with the License. Please obtain a copy of the License at | |
| 10 | * http://www.opensource.apple.com/apsl/ and read it before using this | |
| 11 | * file. | |
| 12 | * | |
| 13 | * The Original Code and all software distributed under the License are | |
| 14 | * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER | |
| 15 | * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, | |
| 16 | * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, | |
| 17 | * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. | |
| 18 | * Please see the License for the specific language governing rights and | |
| 19 | * limitations under the License. | |
| 20 | * | |
| 21 | * @APPLE_LICENSE_HEADER_END@ | |
| 22 | */ | |
| 23 | ||
| 24 | ||
| 25 | // | |
| 26 | // timeflow - abstract view of the flow of time | |
| 27 | // | |
| 28 | #include "timeflow.h" | |
| 29 | #include <stdint.h> | |
| 30 | #include <math.h> | |
| 31 | ||
| 32 | ||
| 33 | namespace Security { | |
| 34 | namespace Time { | |
| 35 | ||
| 36 | ||
| 37 | // | |
| 38 | // Get "now" | |
| 39 | // | |
| 40 | Absolute now() | |
| 41 | { | |
| 42 | struct timeval tv; | |
| 43 | gettimeofday(&tv, NULL); | |
| 44 | return tv.tv_sec + double(tv.tv_usec) / 1E6; | |
| 45 | } | |
| 46 | ||
| 47 | ||
| 48 | // | |
| 49 | // OOL Conversions | |
| 50 | // | |
| 51 | Absolute::Absolute(const struct timeval &tv) | |
| 52 | { mValue = tv.tv_sec + double(tv.tv_usec) / 1E6; } | |
| 53 | ||
| 54 | Absolute::Absolute(const struct timespec &tv) | |
| 55 | { mValue = tv.tv_sec + double(tv.tv_nsec) / 1E9; } | |
| 56 | ||
| 57 | Absolute::operator struct timeval () const | |
| 58 | { | |
| 59 | struct timeval tv; | |
| 60 | if (mValue > LONG_MAX) { | |
| 61 | tv.tv_sec = LONG_MAX; | |
| 62 | tv.tv_usec = 0; | |
| 63 | } else { | |
| 64 | tv.tv_sec = int32_t(mValue); | |
| 65 | double intPart; | |
| 66 | tv.tv_usec = int32_t(modf(mValue, &intPart) * 1E6); | |
| 67 | } | |
| 68 | return tv; | |
| 69 | } | |
| 70 | ||
| 71 | Absolute::operator struct timespec () const | |
| 72 | { | |
| 73 | struct timespec ts; | |
| 74 | if (mValue > LONG_MAX) { | |
| 75 | ts.tv_sec = LONG_MAX; | |
| 76 | ts.tv_nsec = 0; | |
| 77 | } else { | |
| 78 | ts.tv_sec = time_t(mValue); | |
| 79 | double intPart; | |
| 80 | ts.tv_nsec = int32_t(modf(mValue, &intPart) * 1E9); | |
| 81 | } | |
| 82 | return ts; | |
| 83 | } | |
| 84 | ||
| 85 | struct timeval Interval::timevalInterval() const | |
| 86 | { | |
| 87 | struct timeval tv; | |
| 88 | if (mValue > LONG_MAX) { | |
| 89 | tv.tv_sec = LONG_MAX; | |
| 90 | tv.tv_usec = 0; | |
| 91 | } else if (mValue < 0) { | |
| 92 | tv.tv_sec = tv.tv_usec = 0; | |
| 93 | } else { | |
| 94 | tv.tv_sec = int32_t(mValue); | |
| 95 | double intPart; | |
| 96 | tv.tv_usec = int32_t(modf(mValue, &intPart) * 1E6); | |
| 97 | } | |
| 98 | return tv; | |
| 99 | } | |
| 100 | ||
| 101 | ||
| 102 | // | |
| 103 | // Estimate resolution at given time. | |
| 104 | // | |
| 105 | // BSD select(2) has theoretical microsecond resolution, but the underlying | |
| 106 | // Mach system deals with milliseconds, so we report that conservatively. | |
| 107 | // Sometime in the future when the sun is near collapse, residual resolution | |
| 108 | // of a double will drop under 1E-3, but we won't worry about that just yet. | |
| 109 | // | |
| 110 | Interval resolution(Absolute) | |
| 111 | { | |
| 112 | return 0.001; | |
| 113 | } | |
| 114 | ||
| 115 | ||
| 116 | } // end namespace Time | |
| 117 | } // end namespace Security |