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Diffstat (limited to 'include/iprt/time.h')
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diff --git a/include/iprt/time.h b/include/iprt/time.h new file mode 100644 index 00000000..fead7cb1 --- /dev/null +++ b/include/iprt/time.h @@ -0,0 +1,1211 @@ +/** @file + * IPRT - Time. + */ + +/* + * Copyright (C) 2006-2019 Oracle Corporation + * + * This file is part of VirtualBox Open Source Edition (OSE), as + * available from http://www.virtualbox.org. This file is free software; + * you can redistribute it and/or modify it under the terms of the GNU + * General Public License (GPL) as published by the Free Software + * Foundation, in version 2 as it comes in the "COPYING" file of the + * VirtualBox OSE distribution. VirtualBox OSE is distributed in the + * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind. + * + * The contents of this file may alternatively be used under the terms + * of the Common Development and Distribution License Version 1.0 + * (CDDL) only, as it comes in the "COPYING.CDDL" file of the + * VirtualBox OSE distribution, in which case the provisions of the + * CDDL are applicable instead of those of the GPL. + * + * You may elect to license modified versions of this file under the + * terms and conditions of either the GPL or the CDDL or both. + */ + +#ifndef IPRT_INCLUDED_time_h +#define IPRT_INCLUDED_time_h +#ifndef RT_WITHOUT_PRAGMA_ONCE +# pragma once +#endif + +#include <iprt/cdefs.h> +#include <iprt/types.h> +#include <iprt/assertcompile.h> + +RT_C_DECLS_BEGIN + +/** @defgroup grp_rt_time RTTime - Time + * @ingroup grp_rt + * @{ + */ + +/** Time Specification. + * + * Use the inline RTTimeSpecGet/Set to operate on structure this so we + * can easily change the representation if required later. + * + * The current representation is in nanoseconds relative to the unix epoch + * (1970-01-01 00:00:00 UTC). This gives us an approximate span from + * 1678 to 2262 without sacrificing the resolution offered by the various + * host OSes (BSD & LINUX 1ns, NT 100ns). + */ +typedef struct RTTIMESPEC +{ + /** Nanoseconds since epoch. + * The name is intentially too long to be comfortable to use because you should be + * using inline helpers! */ + int64_t i64NanosecondsRelativeToUnixEpoch; +} RTTIMESPEC; + + +/** @name RTTIMESPEC methods + * @{ */ + +/** + * Gets the time as nanoseconds relative to the unix epoch. + * + * @returns Nanoseconds relative to unix epoch. + * @param pTime The time spec to interpret. + */ +DECLINLINE(int64_t) RTTimeSpecGetNano(PCRTTIMESPEC pTime) +{ + return pTime->i64NanosecondsRelativeToUnixEpoch; +} + + +/** + * Sets the time give by nanoseconds relative to the unix epoch. + * + * @returns pTime. + * @param pTime The time spec to modify. + * @param i64Nano The new time in nanoseconds. + */ +DECLINLINE(PRTTIMESPEC) RTTimeSpecSetNano(PRTTIMESPEC pTime, int64_t i64Nano) +{ + pTime->i64NanosecondsRelativeToUnixEpoch = i64Nano; + return pTime; +} + + +/** + * Gets the time as microseconds relative to the unix epoch. + * + * @returns microseconds relative to unix epoch. + * @param pTime The time spec to interpret. + */ +DECLINLINE(int64_t) RTTimeSpecGetMicro(PCRTTIMESPEC pTime) +{ + return pTime->i64NanosecondsRelativeToUnixEpoch / RT_NS_1US; +} + + +/** + * Sets the time given by microseconds relative to the unix epoch. + * + * @returns pTime. + * @param pTime The time spec to modify. + * @param i64Micro The new time in microsecond. + */ +DECLINLINE(PRTTIMESPEC) RTTimeSpecSetMicro(PRTTIMESPEC pTime, int64_t i64Micro) +{ + pTime->i64NanosecondsRelativeToUnixEpoch = i64Micro * RT_NS_1US; + return pTime; +} + + +/** + * Gets the time as milliseconds relative to the unix epoch. + * + * @returns milliseconds relative to unix epoch. + * @param pTime The time spec to interpret. + */ +DECLINLINE(int64_t) RTTimeSpecGetMilli(PCRTTIMESPEC pTime) +{ + return pTime->i64NanosecondsRelativeToUnixEpoch / RT_NS_1MS; +} + + +/** + * Sets the time given by milliseconds relative to the unix epoch. + * + * @returns pTime. + * @param pTime The time spec to modify. + * @param i64Milli The new time in milliseconds. + */ +DECLINLINE(PRTTIMESPEC) RTTimeSpecSetMilli(PRTTIMESPEC pTime, int64_t i64Milli) +{ + pTime->i64NanosecondsRelativeToUnixEpoch = i64Milli * RT_NS_1MS; + return pTime; +} + + +/** + * Gets the time as seconds relative to the unix epoch. + * + * @returns seconds relative to unix epoch. + * @param pTime The time spec to interpret. + */ +DECLINLINE(int64_t) RTTimeSpecGetSeconds(PCRTTIMESPEC pTime) +{ + return pTime->i64NanosecondsRelativeToUnixEpoch / RT_NS_1SEC; +} + + +/** + * Sets the time given by seconds relative to the unix epoch. + * + * @returns pTime. + * @param pTime The time spec to modify. + * @param i64Seconds The new time in seconds. + */ +DECLINLINE(PRTTIMESPEC) RTTimeSpecSetSeconds(PRTTIMESPEC pTime, int64_t i64Seconds) +{ + pTime->i64NanosecondsRelativeToUnixEpoch = i64Seconds * RT_NS_1SEC; + return pTime; +} + + +/** + * Makes the time spec absolute like abs() does (i.e. a positive value). + * + * @returns pTime. + * @param pTime The time spec to modify. + */ +DECLINLINE(PRTTIMESPEC) RTTimeSpecAbsolute(PRTTIMESPEC pTime) +{ + if (pTime->i64NanosecondsRelativeToUnixEpoch < 0) + pTime->i64NanosecondsRelativeToUnixEpoch = -pTime->i64NanosecondsRelativeToUnixEpoch; + return pTime; +} + + +/** + * Negates the time. + * + * @returns pTime. + * @param pTime The time spec to modify. + */ +DECLINLINE(PRTTIMESPEC) RTTimeSpecNegate(PRTTIMESPEC pTime) +{ + pTime->i64NanosecondsRelativeToUnixEpoch = -pTime->i64NanosecondsRelativeToUnixEpoch; + return pTime; +} + + +/** + * Adds a time period to the time. + * + * @returns pTime. + * @param pTime The time spec to modify. + * @param pTimeAdd The time spec to add to pTime. + */ +DECLINLINE(PRTTIMESPEC) RTTimeSpecAdd(PRTTIMESPEC pTime, PCRTTIMESPEC pTimeAdd) +{ + pTime->i64NanosecondsRelativeToUnixEpoch += pTimeAdd->i64NanosecondsRelativeToUnixEpoch; + return pTime; +} + + +/** + * Adds a time period give as nanoseconds from the time. + * + * @returns pTime. + * @param pTime The time spec to modify. + * @param i64Nano The time period in nanoseconds. + */ +DECLINLINE(PRTTIMESPEC) RTTimeSpecAddNano(PRTTIMESPEC pTime, int64_t i64Nano) +{ + pTime->i64NanosecondsRelativeToUnixEpoch += i64Nano; + return pTime; +} + + +/** + * Adds a time period give as microseconds from the time. + * + * @returns pTime. + * @param pTime The time spec to modify. + * @param i64Micro The time period in microseconds. + */ +DECLINLINE(PRTTIMESPEC) RTTimeSpecAddMicro(PRTTIMESPEC pTime, int64_t i64Micro) +{ + pTime->i64NanosecondsRelativeToUnixEpoch += i64Micro * RT_NS_1US; + return pTime; +} + + +/** + * Adds a time period give as milliseconds from the time. + * + * @returns pTime. + * @param pTime The time spec to modify. + * @param i64Milli The time period in milliseconds. + */ +DECLINLINE(PRTTIMESPEC) RTTimeSpecAddMilli(PRTTIMESPEC pTime, int64_t i64Milli) +{ + pTime->i64NanosecondsRelativeToUnixEpoch += i64Milli * RT_NS_1MS; + return pTime; +} + + +/** + * Adds a time period give as seconds from the time. + * + * @returns pTime. + * @param pTime The time spec to modify. + * @param i64Seconds The time period in seconds. + */ +DECLINLINE(PRTTIMESPEC) RTTimeSpecAddSeconds(PRTTIMESPEC pTime, int64_t i64Seconds) +{ + pTime->i64NanosecondsRelativeToUnixEpoch += i64Seconds * RT_NS_1SEC; + return pTime; +} + + +/** + * Subtracts a time period from the time. + * + * @returns pTime. + * @param pTime The time spec to modify. + * @param pTimeSub The time spec to subtract from pTime. + */ +DECLINLINE(PRTTIMESPEC) RTTimeSpecSub(PRTTIMESPEC pTime, PCRTTIMESPEC pTimeSub) +{ + pTime->i64NanosecondsRelativeToUnixEpoch -= pTimeSub->i64NanosecondsRelativeToUnixEpoch; + return pTime; +} + + +/** + * Subtracts a time period give as nanoseconds from the time. + * + * @returns pTime. + * @param pTime The time spec to modify. + * @param i64Nano The time period in nanoseconds. + */ +DECLINLINE(PRTTIMESPEC) RTTimeSpecSubNano(PRTTIMESPEC pTime, int64_t i64Nano) +{ + pTime->i64NanosecondsRelativeToUnixEpoch -= i64Nano; + return pTime; +} + + +/** + * Subtracts a time period give as microseconds from the time. + * + * @returns pTime. + * @param pTime The time spec to modify. + * @param i64Micro The time period in microseconds. + */ +DECLINLINE(PRTTIMESPEC) RTTimeSpecSubMicro(PRTTIMESPEC pTime, int64_t i64Micro) +{ + pTime->i64NanosecondsRelativeToUnixEpoch -= i64Micro * RT_NS_1US; + return pTime; +} + + +/** + * Subtracts a time period give as milliseconds from the time. + * + * @returns pTime. + * @param pTime The time spec to modify. + * @param i64Milli The time period in milliseconds. + */ +DECLINLINE(PRTTIMESPEC) RTTimeSpecSubMilli(PRTTIMESPEC pTime, int64_t i64Milli) +{ + pTime->i64NanosecondsRelativeToUnixEpoch -= i64Milli * RT_NS_1MS; + return pTime; +} + + +/** + * Subtracts a time period give as seconds from the time. + * + * @returns pTime. + * @param pTime The time spec to modify. + * @param i64Seconds The time period in seconds. + */ +DECLINLINE(PRTTIMESPEC) RTTimeSpecSubSeconds(PRTTIMESPEC pTime, int64_t i64Seconds) +{ + pTime->i64NanosecondsRelativeToUnixEpoch -= i64Seconds * RT_NS_1SEC; + return pTime; +} + + +/** + * Gives the time in seconds and nanoseconds. + * + * @returns pTime. + * @param pTime The time spec to interpret. + * @param *pi32Seconds Where to store the time period in seconds. + * @param *pi32Nano Where to store the time period in nanoseconds. + */ +DECLINLINE(void) RTTimeSpecGetSecondsAndNano(PRTTIMESPEC pTime, int32_t *pi32Seconds, int32_t *pi32Nano) +{ + int64_t i64 = RTTimeSpecGetNano(pTime); + int32_t i32Nano = (int32_t)(i64 % RT_NS_1SEC); + i64 /= RT_NS_1SEC; + if (i32Nano < 0) + { + i32Nano += RT_NS_1SEC; + i64--; + } + *pi32Seconds = (int32_t)i64; + *pi32Nano = i32Nano; +} + + +/* PORTME: Add struct timeval guard macro here. */ +#if defined(RTTIME_INCL_TIMEVAL) || defined(_STRUCT_TIMEVAL) || defined(_SYS__TIMEVAL_H_) || defined(_SYS_TIME_H) || defined(_TIMEVAL) || defined(_LINUX_TIME_H) \ + || (defined(RT_OS_NETBSD) && defined(_SYS_TIME_H_)) +/** + * Gets the time as POSIX timeval. + * + * @returns pTime. + * @param pTime The time spec to interpret. + * @param pTimeval Where to store the time as POSIX timeval. + */ +DECLINLINE(struct timeval *) RTTimeSpecGetTimeval(PCRTTIMESPEC pTime, struct timeval *pTimeval) +{ + int64_t i64 = RTTimeSpecGetMicro(pTime); + int32_t i32Micro = (int32_t)(i64 % RT_US_1SEC); + i64 /= RT_US_1SEC; + if (i32Micro < 0) + { + i32Micro += RT_US_1SEC; + i64--; + } + pTimeval->tv_sec = (time_t)i64; + pTimeval->tv_usec = i32Micro; + return pTimeval; +} + +/** + * Sets the time as POSIX timeval. + * + * @returns pTime. + * @param pTime The time spec to modify. + * @param pTimeval Pointer to the POSIX timeval struct with the new time. + */ +DECLINLINE(PRTTIMESPEC) RTTimeSpecSetTimeval(PRTTIMESPEC pTime, const struct timeval *pTimeval) +{ + return RTTimeSpecAddMicro(RTTimeSpecSetSeconds(pTime, pTimeval->tv_sec), pTimeval->tv_usec); +} +#endif /* various ways of detecting struct timeval */ + + +/* PORTME: Add struct timespec guard macro here. */ +#if defined(RTTIME_INCL_TIMESPEC) || defined(_STRUCT_TIMESPEC) || defined(_SYS__TIMESPEC_H_) || defined(TIMEVAL_TO_TIMESPEC) || defined(_TIMESPEC) \ + || (defined(RT_OS_NETBSD) && defined(_SYS_TIME_H_)) +/** + * Gets the time as POSIX timespec. + * + * @returns pTime. + * @param pTime The time spec to interpret. + * @param pTimespec Where to store the time as POSIX timespec. + */ +DECLINLINE(struct timespec *) RTTimeSpecGetTimespec(PCRTTIMESPEC pTime, struct timespec *pTimespec) +{ + int64_t i64 = RTTimeSpecGetNano(pTime); + int32_t i32Nano = (int32_t)(i64 % RT_NS_1SEC); + i64 /= RT_NS_1SEC; + if (i32Nano < 0) + { + i32Nano += RT_NS_1SEC; + i64--; + } + pTimespec->tv_sec = (time_t)i64; + pTimespec->tv_nsec = i32Nano; + return pTimespec; +} + +/** + * Sets the time as POSIX timespec. + * + * @returns pTime. + * @param pTime The time spec to modify. + * @param pTimespec Pointer to the POSIX timespec struct with the new time. + */ +DECLINLINE(PRTTIMESPEC) RTTimeSpecSetTimespec(PRTTIMESPEC pTime, const struct timespec *pTimespec) +{ + return RTTimeSpecAddNano(RTTimeSpecSetSeconds(pTime, pTimespec->tv_sec), pTimespec->tv_nsec); +} + + +# ifdef _LINUX_TIME64_H +DECLINLINE(PRTTIMESPEC) RTTimeSpecSetTimespec64(PRTTIMESPEC pTime, const struct timespec64 *pTimeval) +{ + return RTTimeSpecAddNano(RTTimeSpecSetSeconds(pTime, pTimeval->tv_sec), pTimeval->tv_nsec); +} +# endif +#endif /* various ways of detecting struct timespec */ + + + +/** The offset of the unix epoch and the base for NT time (in 100ns units). + * Nt time starts at 1601-01-01 00:00:00. */ +#define RTTIME_NT_TIME_OFFSET_UNIX (116444736000000000LL) + + +/** + * Gets the time as NT time. + * + * @returns Nt time. + * @param pTime The time spec to interpret. + */ +DECLINLINE(uint64_t) RTTimeSpecGetNtTime(PCRTTIMESPEC pTime) +{ + return pTime->i64NanosecondsRelativeToUnixEpoch / 100 + + RTTIME_NT_TIME_OFFSET_UNIX; +} + + +/** + * Sets the time given by Nt time. + * + * @returns pTime. + * @param pTime The time spec to modify. + * @param u64NtTime The new time in Nt time. + */ +DECLINLINE(PRTTIMESPEC) RTTimeSpecSetNtTime(PRTTIMESPEC pTime, uint64_t u64NtTime) +{ + pTime->i64NanosecondsRelativeToUnixEpoch = + ((int64_t)u64NtTime - RTTIME_NT_TIME_OFFSET_UNIX) * 100; + return pTime; +} + + +#ifdef _FILETIME_ +/** + * Gets the time as NT file time. + * + * @returns pFileTime. + * @param pTime The time spec to interpret. + * @param pFileTime Pointer to NT filetime structure. + */ +DECLINLINE(PFILETIME) RTTimeSpecGetNtFileTime(PCRTTIMESPEC pTime, PFILETIME pFileTime) +{ + *((uint64_t *)pFileTime) = RTTimeSpecGetNtTime(pTime); + return pFileTime; +} + +/** + * Sets the time as NT file time. + * + * @returns pTime. + * @param pTime The time spec to modify. + * @param pFileTime Where to store the time as Nt file time. + */ +DECLINLINE(PRTTIMESPEC) RTTimeSpecSetNtFileTime(PRTTIMESPEC pTime, const FILETIME *pFileTime) +{ + return RTTimeSpecSetNtTime(pTime, *(const uint64_t *)pFileTime); +} +#endif + + +/** The offset to the start of DOS time. + * DOS time starts 1980-01-01 00:00:00. */ +#define RTTIME_OFFSET_DOS_TIME (315532800000000000LL) + + +/** + * Gets the time as seconds relative to the start of dos time. + * + * @returns seconds relative to the start of dos time. + * @param pTime The time spec to interpret. + */ +DECLINLINE(int64_t) RTTimeSpecGetDosSeconds(PCRTTIMESPEC pTime) +{ + return (pTime->i64NanosecondsRelativeToUnixEpoch - RTTIME_OFFSET_DOS_TIME) + / RT_NS_1SEC; +} + + +/** + * Sets the time given by seconds relative to the start of dos time. + * + * @returns pTime. + * @param pTime The time spec to modify. + * @param i64Seconds The new time in seconds relative to the start of dos time. + */ +DECLINLINE(PRTTIMESPEC) RTTimeSpecSetDosSeconds(PRTTIMESPEC pTime, int64_t i64Seconds) +{ + pTime->i64NanosecondsRelativeToUnixEpoch = i64Seconds * RT_NS_1SEC + + RTTIME_OFFSET_DOS_TIME; + return pTime; +} + + +/** + * Compare two time specs. + * + * @returns true they are equal. + * @returns false they are not equal. + * @param pTime1 The 1st time spec. + * @param pTime2 The 2nd time spec. + */ +DECLINLINE(bool) RTTimeSpecIsEqual(PCRTTIMESPEC pTime1, PCRTTIMESPEC pTime2) +{ + return pTime1->i64NanosecondsRelativeToUnixEpoch == pTime2->i64NanosecondsRelativeToUnixEpoch; +} + + +/** + * Compare two time specs. + * + * @returns 0 if equal, -1 if @a pLeft is smaller, 1 if @a pLeft is larger. + * @returns false they are not equal. + * @param pLeft The 1st time spec. + * @param pRight The 2nd time spec. + */ +DECLINLINE(int) RTTimeSpecCompare(PCRTTIMESPEC pLeft, PCRTTIMESPEC pRight) +{ + if (pLeft->i64NanosecondsRelativeToUnixEpoch == pRight->i64NanosecondsRelativeToUnixEpoch) + return 0; + return pLeft->i64NanosecondsRelativeToUnixEpoch < pRight->i64NanosecondsRelativeToUnixEpoch ? -1 : 1; +} + + +/** + * Converts a time spec to a ISO date string. + * + * @returns psz on success. + * @returns NULL on buffer underflow. + * @param pTime The time spec. + * @param psz Where to store the string. + * @param cb The size of the buffer. + */ +RTDECL(char *) RTTimeSpecToString(PCRTTIMESPEC pTime, char *psz, size_t cb); + +/** + * Attempts to convert an ISO date string to a time structure. + * + * We're a little forgiving with zero padding, unspecified parts, and leading + * and trailing spaces. + * + * @retval pTime on success, + * @retval NULL on failure. + * @param pTime The time spec. + * @param pszString The ISO date string to convert. + */ +RTDECL(PRTTIMESPEC) RTTimeSpecFromString(PRTTIMESPEC pTime, const char *pszString); + +/** @} */ + + +/** + * Exploded time. + */ +typedef struct RTTIME +{ + /** The year number. */ + int32_t i32Year; + /** The month of the year (1-12). January is 1. */ + uint8_t u8Month; + /** The day of the week (0-6). Monday is 0. */ + uint8_t u8WeekDay; + /** The day of the year (1-366). January the 1st is 1. */ + uint16_t u16YearDay; + /** The day of the month (1-31). */ + uint8_t u8MonthDay; + /** Hour of the day (0-23). */ + uint8_t u8Hour; + /** The minute of the hour (0-59). */ + uint8_t u8Minute; + /** The second of the minute (0-60). + * (u32Nanosecond / 1000000) */ + uint8_t u8Second; + /** The nanoseconds of the second (0-999999999). */ + uint32_t u32Nanosecond; + /** Flags, of the RTTIME_FLAGS_* \#defines. */ + uint32_t fFlags; + /** UCT time offset in minutes (-840-840). Positive for timezones east of + * UTC, negative for zones to the west. Same as what RTTimeLocalDeltaNano + * & RTTimeLocalDeltaNanoFor returns, just different unit. */ + int32_t offUTC; +} RTTIME; +AssertCompileSize(RTTIME, 24); +/** Pointer to a exploded time structure. */ +typedef RTTIME *PRTTIME; +/** Pointer to a const exploded time structure. */ +typedef const RTTIME *PCRTTIME; + +/** @name RTTIME::fFlags values. + * @{ */ +/** Set if the time is UTC. If clear the time local time. */ +#define RTTIME_FLAGS_TYPE_MASK 3 +/** the time is UTC time. */ +#define RTTIME_FLAGS_TYPE_UTC 2 +/** The time is local time. */ +#define RTTIME_FLAGS_TYPE_LOCAL 3 + +/** Set if the time is local and daylight saving time is in effect. + * Not bit is not valid if RTTIME_FLAGS_NO_DST_DATA is set. */ +#define RTTIME_FLAGS_DST RT_BIT(4) +/** Set if the time is local and there is no data available on daylight saving time. */ +#define RTTIME_FLAGS_NO_DST_DATA RT_BIT(5) +/** Set if the year is a leap year. + * This is mutual exclusiv with RTTIME_FLAGS_COMMON_YEAR. */ +#define RTTIME_FLAGS_LEAP_YEAR RT_BIT(6) +/** Set if the year is a common year. + * This is mutual exclusiv with RTTIME_FLAGS_LEAP_YEAR. */ +#define RTTIME_FLAGS_COMMON_YEAR RT_BIT(7) +/** The mask of valid flags. */ +#define RTTIME_FLAGS_MASK UINT32_C(0xff) +/** @} */ + + +/** + * Gets the current system time (UTC). + * + * @returns pTime. + * @param pTime Where to store the time. + */ +RTDECL(PRTTIMESPEC) RTTimeNow(PRTTIMESPEC pTime); + +/** + * Sets the system time. + * + * @returns IPRT status code + * @param pTime The new system time (UTC). + * + * @remarks This will usually fail because changing the wall time is usually + * requires extra privileges. + */ +RTDECL(int) RTTimeSet(PCRTTIMESPEC pTime); + +/** + * Explodes a time spec (UTC). + * + * @returns pTime. + * @param pTime Where to store the exploded time. + * @param pTimeSpec The time spec to exploded. + */ +RTDECL(PRTTIME) RTTimeExplode(PRTTIME pTime, PCRTTIMESPEC pTimeSpec); + +/** + * Implodes exploded time to a time spec (UTC). + * + * @returns pTime on success. + * @returns NULL if the pTime data is invalid. + * @param pTimeSpec Where to store the imploded UTC time. + * If pTime specifies a time which outside the range, maximum or + * minimum values will be returned. + * @param pTime Pointer to the exploded time to implode. + * The fields u8Month, u8WeekDay and u8MonthDay are not used, + * and all the other fields are expected to be within their + * bounds. Use RTTimeNormalize() to calculate u16YearDay and + * normalize the ranges of the fields. + */ +RTDECL(PRTTIMESPEC) RTTimeImplode(PRTTIMESPEC pTimeSpec, PCRTTIME pTime); + +/** + * Normalizes the fields of a time structure. + * + * It is possible to calculate year-day from month/day and vice + * versa. If you adjust any of of these, make sure to zero the + * other so you make it clear which of the fields to use. If + * it's ambiguous, the year-day field is used (and you get + * assertions in debug builds). + * + * All the time fields and the year-day or month/day fields will + * be adjusted for overflows. (Since all fields are unsigned, there + * is no underflows.) It is possible to exploit this for simple + * date math, though the recommended way of doing that to implode + * the time into a timespec and do the math on that. + * + * @returns pTime on success. + * @returns NULL if the data is invalid. + * + * @param pTime The time structure to normalize. + * + * @remarks This function doesn't work with local time, only with UTC time. + */ +RTDECL(PRTTIME) RTTimeNormalize(PRTTIME pTime); + +/** + * Gets the current local system time. + * + * @returns pTime. + * @param pTime Where to store the local time. + */ +RTDECL(PRTTIMESPEC) RTTimeLocalNow(PRTTIMESPEC pTime); + +/** + * Gets the current delta between UTC and local time. + * + * @code + * RTTIMESPEC LocalTime; + * RTTimeSpecAddNano(RTTimeNow(&LocalTime), RTTimeLocalDeltaNano()); + * @endcode + * + * @returns Returns the nanosecond delta between UTC and local time. + */ +RTDECL(int64_t) RTTimeLocalDeltaNano(void); + +/** + * Gets the delta between UTC and local time at the given time. + * + * @code + * RTTIMESPEC LocalTime; + * RTTimeNow(&LocalTime); + * RTTimeSpecAddNano(&LocalTime, RTTimeLocalDeltaNanoFor(&LocalTime)); + * @endcode + * + * @param pTimeSpec The time spec giving the time to get the delta for. + * @returns Returns the nanosecond delta between UTC and local time. + */ +RTDECL(int64_t) RTTimeLocalDeltaNanoFor(PCRTTIMESPEC pTimeSpec); + +/** + * Explodes a time spec to the localized timezone. + * + * @returns pTime. + * @param pTime Where to store the exploded time. + * @param pTimeSpec The time spec to exploded (UTC). + */ +RTDECL(PRTTIME) RTTimeLocalExplode(PRTTIME pTime, PCRTTIMESPEC pTimeSpec); + +/** + * Normalizes the fields of a time structure containing local time. + * + * See RTTimeNormalize for details. + * + * @returns pTime on success. + * @returns NULL if the data is invalid. + * @param pTime The time structure to normalize. + */ +RTDECL(PRTTIME) RTTimeLocalNormalize(PRTTIME pTime); + +/** + * Converts a time structure to UTC, relying on UTC offset information + * if it contains local time. + * + * @returns pTime on success. + * @returns NULL if the data is invalid. + * @param pTime The time structure to convert. + */ +RTDECL(PRTTIME) RTTimeConvertToZulu(PRTTIME pTime); + +/** + * Converts a time spec to a ISO date string. + * + * @returns psz on success. + * @returns NULL on buffer underflow. + * @param pTime The time. Caller should've normalized this. + * @param psz Where to store the string. + * @param cb The size of the buffer. + */ +RTDECL(char *) RTTimeToString(PCRTTIME pTime, char *psz, size_t cb); + +/** + * Converts a time spec to a ISO date string, extended version. + * + * @returns Output string length on success (positive), VERR_BUFFER_OVERFLOW + * (negative) or VERR_OUT_OF_RANGE (negative) on failure. + * @param pTime The time. Caller should've normalized this. + * @param psz Where to store the string. + * @param cb The size of the buffer. + * @param cFractionDigits Number of digits in the fraction. Max is 9. + */ +RTDECL(ssize_t) RTTimeToStringEx(PCRTTIME pTime, char *psz, size_t cb, unsigned cFractionDigits); + +/** Suggested buffer length for RTTimeToString and RTTimeToStringEx output, including terminator. */ +#define RTTIME_STR_LEN 40 + +/** + * Attempts to convert an ISO date string to a time structure. + * + * We're a little forgiving with zero padding, unspecified parts, and leading + * and trailing spaces. + * + * @retval pTime on success, + * @retval NULL on failure. + * @param pTime Where to store the time on success. + * @param pszString The ISO date string to convert. + */ +RTDECL(PRTTIME) RTTimeFromString(PRTTIME pTime, const char *pszString); + +/** + * Formats the given time on a RTC-2822 compliant format. + * + * @returns Output string length on success (positive), VERR_BUFFER_OVERFLOW + * (negative) on failure. + * @param pTime The time. Caller should've normalized this. + * @param psz Where to store the string. + * @param cb The size of the buffer. + * @param fFlags RTTIME_RFC2822_F_XXX + * @sa RTTIME_RFC2822_LEN + */ +RTDECL(ssize_t) RTTimeToRfc2822(PRTTIME pTime, char *psz, size_t cb, uint32_t fFlags); + +/** Suggested buffer length for RTTimeToRfc2822 output, including terminator. */ +#define RTTIME_RFC2822_LEN 40 +/** @name RTTIME_RFC2822_F_XXX + * @{ */ +/** Use the deprecated GMT timezone instead of +/-0000. + * This is required by the HTTP RFC-7231 7.1.1.1. */ +#define RTTIME_RFC2822_F_GMT RT_BIT_32(0) +/** @} */ + +/** + * Attempts to convert an RFC-2822 date string to a time structure. + * + * We're a little forgiving with zero padding, unspecified parts, and leading + * and trailing spaces. + * + * @retval pTime on success, + * @retval NULL on failure. + * @param pTime Where to store the time on success. + * @param pszString The ISO date string to convert. + */ +RTDECL(PRTTIME) RTTimeFromRfc2822(PRTTIME pTime, const char *pszString); + +/** + * Checks if a year is a leap year or not. + * + * @returns true if it's a leap year. + * @returns false if it's a common year. + * @param i32Year The year in question. + */ +RTDECL(bool) RTTimeIsLeapYear(int32_t i32Year); + +/** + * Compares two normalized time structures. + * + * @retval 0 if equal. + * @retval -1 if @a pLeft is earlier than @a pRight. + * @retval 1 if @a pRight is earlier than @a pLeft. + * + * @param pLeft The left side time. NULL is accepted. + * @param pRight The right side time. NULL is accepted. + * + * @note A NULL time is considered smaller than anything else. If both are + * NULL, they are considered equal. + */ +RTDECL(int) RTTimeCompare(PCRTTIME pLeft, PCRTTIME pRight); + +/** + * Gets the current nanosecond timestamp. + * + * @returns nanosecond timestamp. + */ +RTDECL(uint64_t) RTTimeNanoTS(void); + +/** + * Gets the current millisecond timestamp. + * + * @returns millisecond timestamp. + */ +RTDECL(uint64_t) RTTimeMilliTS(void); + +/** + * Debugging the time api. + * + * @returns the number of 1ns steps which has been applied by RTTimeNanoTS(). + */ +RTDECL(uint32_t) RTTimeDbgSteps(void); + +/** + * Debugging the time api. + * + * @returns the number of times the TSC interval expired RTTimeNanoTS(). + */ +RTDECL(uint32_t) RTTimeDbgExpired(void); + +/** + * Debugging the time api. + * + * @returns the number of bad previous values encountered by RTTimeNanoTS(). + */ +RTDECL(uint32_t) RTTimeDbgBad(void); + +/** + * Debugging the time api. + * + * @returns the number of update races in RTTimeNanoTS(). + */ +RTDECL(uint32_t) RTTimeDbgRaces(void); + +/** @name RTTimeNanoTS GIP worker functions, for TM. + * @{ */ +/** Pointer to a RTTIMENANOTSDATA structure. */ +typedef struct RTTIMENANOTSDATA *PRTTIMENANOTSDATA; + +/** + * Nanosecond timestamp data. + * + * This is used to keep track of statistics and callback so IPRT + * and TM (VirtualBox) can share code. + * + * @remark Keep this in sync with the assembly version in timesupA.asm. + */ +typedef struct RTTIMENANOTSDATA +{ + /** Where the previous timestamp is stored. + * This is maintained to ensure that time doesn't go backwards or anything. */ + uint64_t volatile *pu64Prev; + + /** + * Helper function that's used by the assembly routines when something goes bust. + * + * @param pData Pointer to this structure. + * @param u64NanoTS The calculated nano ts. + * @param u64DeltaPrev The delta relative to the previously returned timestamp. + * @param u64PrevNanoTS The previously returned timestamp (as it was read it). + */ + DECLCALLBACKMEMBER(void, pfnBad)(PRTTIMENANOTSDATA pData, uint64_t u64NanoTS, uint64_t u64DeltaPrev, uint64_t u64PrevNanoTS); + + /** + * Callback for when rediscovery is required. + * + * @returns Nanosecond timestamp. + * @param pData Pointer to this structure. + */ + DECLCALLBACKMEMBER(uint64_t, pfnRediscover)(PRTTIMENANOTSDATA pData); + + /** + * Callback for when some CPU index related stuff goes wrong. + * + * @returns Nanosecond timestamp. + * @param pData Pointer to this structure. + * @param idApic The APIC ID if available, otherwise (UINT16_MAX-1). + * @param iCpuSet The CPU set index if available, otherwise + * (UINT16_MAX-1). + * @param iGipCpu The GIP CPU array index if available, otherwise + * (UINT16_MAX-1). + */ + DECLCALLBACKMEMBER(uint64_t, pfnBadCpuIndex)(PRTTIMENANOTSDATA pData, uint16_t idApic, uint16_t iCpuSet, uint16_t iGipCpu); + + /** Number of 1ns steps because of overshooting the period. */ + uint32_t c1nsSteps; + /** The number of times the interval expired (overflow). */ + uint32_t cExpired; + /** Number of "bad" previous values. */ + uint32_t cBadPrev; + /** The number of update races. */ + uint32_t cUpdateRaces; +} RTTIMENANOTSDATA; + +#ifndef IN_RING3 +/** + * The Ring-3 layout of the RTTIMENANOTSDATA structure. + */ +typedef struct RTTIMENANOTSDATAR3 +{ + R3PTRTYPE(uint64_t volatile *) pu64Prev; + DECLR3CALLBACKMEMBER(void, pfnBad,(PRTTIMENANOTSDATA pData, uint64_t u64NanoTS, uint64_t u64DeltaPrev, uint64_t u64PrevNanoTS)); + DECLR3CALLBACKMEMBER(uint64_t, pfnRediscover,(PRTTIMENANOTSDATA pData)); + DECLR3CALLBACKMEMBER(uint64_t, pfnBadCpuIndex,(PRTTIMENANOTSDATA pData, uint16_t idApic, uint16_t iCpuSet, uint16_t iGipCpu)); + uint32_t c1nsSteps; + uint32_t cExpired; + uint32_t cBadPrev; + uint32_t cUpdateRaces; +} RTTIMENANOTSDATAR3; +#else +typedef RTTIMENANOTSDATA RTTIMENANOTSDATAR3; +#endif + +#ifndef IN_RING0 +/** + * The Ring-3 layout of the RTTIMENANOTSDATA structure. + */ +typedef struct RTTIMENANOTSDATAR0 +{ + R0PTRTYPE(uint64_t volatile *) pu64Prev; + DECLR0CALLBACKMEMBER(void, pfnBad,(PRTTIMENANOTSDATA pData, uint64_t u64NanoTS, uint64_t u64DeltaPrev, uint64_t u64PrevNanoTS)); + DECLR0CALLBACKMEMBER(uint64_t, pfnRediscover,(PRTTIMENANOTSDATA pData)); + DECLR0CALLBACKMEMBER(uint64_t, pfnBadCpuIndex,(PRTTIMENANOTSDATA pData, uint16_t idApic, uint16_t iCpuSet, uint16_t iGipCpu)); + uint32_t c1nsSteps; + uint32_t cExpired; + uint32_t cBadPrev; + uint32_t cUpdateRaces; +} RTTIMENANOTSDATAR0; +#else +typedef RTTIMENANOTSDATA RTTIMENANOTSDATAR0; +#endif + +#ifndef IN_RC +/** + * The RC layout of the RTTIMENANOTSDATA structure. + */ +typedef struct RTTIMENANOTSDATARC +{ + RCPTRTYPE(uint64_t volatile *) pu64Prev; + DECLRCCALLBACKMEMBER(void, pfnBad,(PRTTIMENANOTSDATA pData, uint64_t u64NanoTS, uint64_t u64DeltaPrev, uint64_t u64PrevNanoTS)); + DECLRCCALLBACKMEMBER(uint64_t, pfnRediscover,(PRTTIMENANOTSDATA pData)); + DECLRCCALLBACKMEMBER(uint64_t, pfnBadCpuIndex,(PRTTIMENANOTSDATA pData, uint16_t idApic, uint16_t iCpuSet, uint16_t iGipCpu)); + uint32_t c1nsSteps; + uint32_t cExpired; + uint32_t cBadPrev; + uint32_t cUpdateRaces; +} RTTIMENANOTSDATARC; +#else +typedef RTTIMENANOTSDATA RTTIMENANOTSDATARC; +#endif + +/** Internal RTTimeNanoTS worker (assembly). */ +typedef DECLCALLBACK(uint64_t) FNTIMENANOTSINTERNAL(PRTTIMENANOTSDATA pData); +/** Pointer to an internal RTTimeNanoTS worker (assembly). */ +typedef FNTIMENANOTSINTERNAL *PFNTIMENANOTSINTERNAL; +RTDECL(uint64_t) RTTimeNanoTSLegacySyncInvarNoDelta(PRTTIMENANOTSDATA pData); +RTDECL(uint64_t) RTTimeNanoTSLFenceSyncInvarNoDelta(PRTTIMENANOTSDATA pData); +#ifdef IN_RING3 +RTDECL(uint64_t) RTTimeNanoTSLegacyAsyncUseApicId(PRTTIMENANOTSDATA pData); +RTDECL(uint64_t) RTTimeNanoTSLegacyAsyncUseRdtscp(PRTTIMENANOTSDATA pData); +RTDECL(uint64_t) RTTimeNanoTSLegacyAsyncUseRdtscpGroupChNumCl(PRTTIMENANOTSDATA pData); +RTDECL(uint64_t) RTTimeNanoTSLegacyAsyncUseIdtrLim(PRTTIMENANOTSDATA pData); +RTDECL(uint64_t) RTTimeNanoTSLegacySyncInvarWithDeltaUseApicId(PRTTIMENANOTSDATA pData); +RTDECL(uint64_t) RTTimeNanoTSLegacySyncInvarWithDeltaUseRdtscp(PRTTIMENANOTSDATA pData); +RTDECL(uint64_t) RTTimeNanoTSLegacySyncInvarWithDeltaUseIdtrLim(PRTTIMENANOTSDATA pData); +RTDECL(uint64_t) RTTimeNanoTSLFenceAsyncUseApicId(PRTTIMENANOTSDATA pData); +RTDECL(uint64_t) RTTimeNanoTSLFenceAsyncUseRdtscp(PRTTIMENANOTSDATA pData); +RTDECL(uint64_t) RTTimeNanoTSLFenceAsyncUseRdtscpGroupChNumCl(PRTTIMENANOTSDATA pData); +RTDECL(uint64_t) RTTimeNanoTSLFenceAsyncUseIdtrLim(PRTTIMENANOTSDATA pData); +RTDECL(uint64_t) RTTimeNanoTSLFenceSyncInvarWithDeltaUseApicId(PRTTIMENANOTSDATA pData); +RTDECL(uint64_t) RTTimeNanoTSLFenceSyncInvarWithDeltaUseRdtscp(PRTTIMENANOTSDATA pData); +RTDECL(uint64_t) RTTimeNanoTSLFenceSyncInvarWithDeltaUseIdtrLim(PRTTIMENANOTSDATA pData); +#else +RTDECL(uint64_t) RTTimeNanoTSLegacyAsync(PRTTIMENANOTSDATA pData); +RTDECL(uint64_t) RTTimeNanoTSLegacySyncInvarWithDelta(PRTTIMENANOTSDATA pData); +RTDECL(uint64_t) RTTimeNanoTSLFenceAsync(PRTTIMENANOTSDATA pData); +RTDECL(uint64_t) RTTimeNanoTSLFenceSyncInvarWithDelta(PRTTIMENANOTSDATA pData); +#endif + +/** @} */ + + +/** + * Gets the current nanosecond timestamp. + * + * This differs from RTTimeNanoTS in that it will use system APIs and not do any + * resolution or performance optimizations. + * + * @returns nanosecond timestamp. + */ +RTDECL(uint64_t) RTTimeSystemNanoTS(void); + +/** + * Gets the current millisecond timestamp. + * + * This differs from RTTimeNanoTS in that it will use system APIs and not do any + * resolution or performance optimizations. + * + * @returns millisecond timestamp. + */ +RTDECL(uint64_t) RTTimeSystemMilliTS(void); + +/** + * Get the nanosecond timestamp relative to program startup. + * + * @returns Timestamp relative to program startup. + */ +RTDECL(uint64_t) RTTimeProgramNanoTS(void); + +/** + * Get the microsecond timestamp relative to program startup. + * + * @returns Timestamp relative to program startup. + */ +RTDECL(uint64_t) RTTimeProgramMicroTS(void); + +/** + * Get the millisecond timestamp relative to program startup. + * + * @returns Timestamp relative to program startup. + */ +RTDECL(uint64_t) RTTimeProgramMilliTS(void); + +/** + * Get the second timestamp relative to program startup. + * + * @returns Timestamp relative to program startup. + */ +RTDECL(uint32_t) RTTimeProgramSecTS(void); + +/** + * Get the RTTimeNanoTS() of when the program started. + * + * @returns Program startup timestamp. + */ +RTDECL(uint64_t) RTTimeProgramStartNanoTS(void); + + +/** + * Time zone information. + */ +typedef struct RTTIMEZONEINFO +{ + /** Unix time zone name (continent/country[/city]|). */ + const char *pszUnixName; + /** Windows time zone name. */ + const char *pszWindowsName; + /** The length of the unix time zone name. */ + uint8_t cchUnixName; + /** The length of the windows time zone name. */ + uint8_t cchWindowsName; + /** Two letter country/territory code if applicable, otherwise 'ZZ'. */ + char szCountry[3]; + /** Two letter windows country/territory code if applicable. + * Empty string if no windows mapping. */ + char szWindowsCountry[3]; +#if 0 /* Add when needed and it's been extracted. */ + /** The standard delta in minutes (add to UTC). */ + int16_t cMinStdDelta; + /** The daylight saving time delta in minutes (add to UTC). */ + int16_t cMinDstDelta; +#endif + /** closest matching windows time zone index. */ + uint32_t idxWindows; + /** Flags, RTTIMEZONEINFO_F_XXX. */ + uint32_t fFlags; +} RTTIMEZONEINFO; +/** Pointer to time zone info. */ +typedef RTTIMEZONEINFO const *PCRTTIMEZONEINFO; + +/** @name RTTIMEZONEINFO_F_XXX - time zone info flags. + * @{ */ +/** Indicates golden mapping entry for a windows time zone name. */ +#define RTTIMEZONEINFO_F_GOLDEN RT_BIT_32(0) +/** @} */ + +/** + * Looks up static time zone information by unix name. + * + * @returns Pointer to info entry if found, NULL if not. + * @param pszName The unix zone name (TZ). + */ +RTDECL(PCRTTIMEZONEINFO) RTTimeZoneGetInfoByUnixName(const char *pszName); + +/** + * Looks up static time zone information by window name. + * + * @returns Pointer to info entry if found, NULL if not. + * @param pszName The windows zone name (reg key). + */ +RTDECL(PCRTTIMEZONEINFO) RTTimeZoneGetInfoByWindowsName(const char *pszName); + +/** + * Looks up static time zone information by windows index. + * + * @returns Pointer to info entry if found, NULL if not. + * @param idxZone The windows timezone index. + */ +RTDECL(PCRTTIMEZONEINFO) RTTimeZoneGetInfoByWindowsIndex(uint32_t idxZone); + +/** + * Get the current time zone (TZ). + * + * @returns IPRT status code. + * @param pszName Where to return the time zone name. + * @param cbName The size of the name buffer. + */ +RTDECL(int) RTTimeZoneGetCurrent(char *pszName, size_t cbName); + +/** @} */ + +RT_C_DECLS_END + +#endif /* !IPRT_INCLUDED_time_h */ + |