/* * Copyright (c) 2000-2001 Apple Computer, Inc. All Rights Reserved. * * The contents of this file constitute Original Code as defined in and are * subject to the Apple Public Source License Version 1.2 (the 'License'). * You may not use this file except in compliance with the License. Please obtain * a copy of the License at http://www.apple.com/publicsource and read it before * using this file. * * This Original Code and all software distributed under the License are * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESS * OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, INCLUDING WITHOUT * LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR * PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. Please see the License for the * specific language governing rights and limitations under the License. */ // // timeflow - abstract view of the flow of time // #include "timeflow.h" #include <sys/time.h> #include <math.h> namespace Security { namespace Time { // // Get "now" // Absolute now() { struct timeval tv; gettimeofday(&tv, NULL); return tv.tv_sec + double(tv.tv_usec) / 1E6; } // // OOL Conversions // Absolute::Absolute(const struct timeval &tv) { mValue = tv.tv_sec + double(tv.tv_usec) / 1E6; } Absolute::Absolute(const struct timespec &tv) { mValue = tv.tv_sec + double(tv.tv_nsec) / 1E9; } Absolute::operator struct timeval () const { struct timeval tv; if (mValue > LONG_MAX) { tv.tv_sec = LONG_MAX; tv.tv_usec = 0; } else { tv.tv_sec = int32_t(mValue); double intPart; tv.tv_usec = int32_t(modf(mValue, &intPart) * 1E6); } return tv; } Absolute::operator struct timespec () const { struct timespec ts; if (mValue > LONG_MAX) { ts.tv_sec = LONG_MAX; ts.tv_nsec = 0; } else { ts.tv_sec = time_t(mValue); double intPart; ts.tv_nsec = int32_t(modf(mValue, &intPart) * 1E9); } return ts; } struct timeval Interval::timevalInterval() const { struct timeval tv; if (mValue > LONG_MAX) { tv.tv_sec = LONG_MAX; tv.tv_usec = 0; } else if (mValue < 0) { tv.tv_sec = tv.tv_usec = 0; } else { tv.tv_sec = int32_t(mValue); double intPart; tv.tv_usec = int32_t(modf(mValue, &intPart) * 1E6); } return tv; } // // Estimate resolution at given time. // // BSD select(2) has theoretical microsecond resolution, but the underlying // Mach system deals with milliseconds, so we report that conservatively. // Sometime in the future when the sun is near collapse, residual resolution // of a double will drop under 1E-3, but we won't worry about that just yet. // Interval resolution(Absolute) { return 0.001; } } // end namespace Time } // end namespace Security