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Edit File : time.h \| Size : 8.67 KB
/* * Copyright (C) Internet Systems Consortium, Inc. ("ISC") * * This Source Code Form is subject to the terms of the Mozilla Public * License, v. 2.0. If a copy of the MPL was not distributed with this * file, you can obtain one at https://mozilla.org/MPL/2.0/. * * See the COPYRIGHT file distributed with this work for additional * information regarding copyright ownership. / #ifndef ISC_TIME_H #define ISC_TIME_H 1 /! \file / #include <inttypes.h> #include <stdbool.h> #include <isc/lang.h> #include <isc/types.h> / * Intervals **/ /! * \brief * The contents of this structure are private, and MUST NOT be accessed * directly by callers. * * The contents are exposed only to allow callers to avoid dynamic allocation. / struct isc_interval { unsigned int seconds; unsigned int nanoseconds; }; extern const isc_interval_t const isc_interval_zero; /* * ISC_FORMATHTTPTIMESTAMP_SIZE needs to be 30 in C locale and potentially * more for other locales to handle longer national abbreviations when * expanding strftime's %a and %b. / #define ISC_FORMATHTTPTIMESTAMP_SIZE 50 ISC_LANG_BEGINDECLS void isc_interval_set(isc_interval_t i, unsigned int seconds, unsigned int nanoseconds); /%< Set 'i' to a value representing an interval of 'seconds' seconds and * 'nanoseconds' nanoseconds, suitable for use in isc_time_add() and * isc_time_subtract(). * * Requires: * \li 't' is a valid pointer. \li nanoseconds < 1000000000. / bool isc_interval_iszero(const isc_interval_t i); /%< Returns true iff. 'i' is the zero interval. * * Requires: * \li 'i' is a valid pointer. / /* * Absolute Times **/ /% * The contents of this structure are private, and MUST NOT be accessed * directly by callers. * * The contents are exposed only to allow callers to avoid dynamic allocation. / struct isc_time { unsigned int seconds; unsigned int nanoseconds; }; extern const isc_time_t const isc_time_epoch; void isc_time_set(isc_time_t t, unsigned int seconds, unsigned int nanoseconds); /%< * Set 't' to a value which represents the given number of seconds and * nanoseconds since 00:00:00 January 1, 1970, UTC. * * Notes: \li The Unix version of this call is equivalent to: \code * isc_time_settoepoch(t); * isc_interval_set(i, seconds, nanoseconds); * isc_time_add(t, i, t); \endcode * Requires: \li 't' is a valid pointer. \li nanoseconds < 1000000000. / void isc_time_settoepoch(isc_time_t t); /%< Set 't' to the time of the epoch. * * Notes: \li The date of the epoch is platform-dependent. * Requires: * \li 't' is a valid pointer. / bool isc_time_isepoch(const isc_time_t t); /%< * Returns true iff. 't' is the epoch ("time zero"). * * Requires: * \li 't' is a valid pointer. / #ifdef CLOCK_BOOTTIME isc_result_t isc_time_boottime(isc_time_t t); /%< * Set 't' to monotonic time from previous boot * it's not affected by system time change. It also * includes the time system was suspended * * Requires: \li 't' is a valid pointer. * Returns: * \li Success \li Unexpected error * Getting the time from the system failed. / #endif / CLOCK_BOOTTIME / isc_result_t isc_time_now(isc_time_t t); /%< Set 't' to the current absolute time. * * Requires: * \li 't' is a valid pointer. * Returns: * \li Success \li Unexpected error * Getting the time from the system failed. \li Out of range The time from the system is too large to be represented * in the current definition of isc_time_t. / isc_result_t isc_time_nowplusinterval(isc_time_t t, const isc_interval_t i); /%< * Set t to the current absolute time + i. * Note: \li This call is equivalent to: \code isc_time_now(t); * isc_time_add(t, i, t); \endcode * Requires: * \li 't' and 'i' are valid pointers. * Returns: * \li Success \li Unexpected error * Getting the time from the system failed. \li Out of range The interval added to the time from the system is too large to * be represented in the current definition of isc_time_t. / int isc_time_compare(const isc_time_t t1, const isc_time_t t2); /%< * Compare the times referenced by 't1' and 't2' * * Requires: * \li 't1' and 't2' are valid pointers. * Returns: * \li -1 t1 < t2 (comparing times, not pointers) \li 0 t1 = t2 \li 1 t1 > t2 / isc_result_t isc_time_add(const isc_time_t t, const isc_interval_t i, isc_time_t result); /%< * Add 'i' to 't', storing the result in 'result'. * * Requires: * \li 't', 'i', and 'result' are valid pointers. * Returns: \li Success \li Out of range * The interval added to the time is too large to * be represented in the current definition of isc_time_t. / isc_result_t isc_time_subtract(const isc_time_t t, const isc_interval_t i, isc_time_t result); /%< Subtract 'i' from 't', storing the result in 'result'. * * Requires: * \li 't', 'i', and 'result' are valid pointers. * Returns: \li Success \li Out of range * The interval is larger than the time since the epoch. / uint64_t isc_time_microdiff(const isc_time_t t1, const isc_time_t t2); /%< * Find the difference in microseconds between time t1 and time t2. * t2 is the subtrahend of t1; ie, difference = t1 - t2. * * Requires: * \li 't1' and 't2' are valid pointers. * Returns: \li The difference of t1 - t2, or 0 if t1 <= t2. / uint32_t isc_time_seconds(const isc_time_t t); /%< * Return the number of seconds since the epoch stored in a time structure. * * Requires: * \li 't' is a valid pointer. / isc_result_t isc_time_secondsastimet(const isc_time_t t, time_t secondsp); /%< Ensure the number of seconds in an isc_time_t is representable by a time_t. * * Notes: \li The number of seconds stored in an isc_time_t might be larger than the number of seconds a time_t is able to handle. Since * time_t is mostly opaque according to the ANSI/ISO standard * (essentially, all you can be sure of is that it is an arithmetic type, * not even necessarily integral), it can be tricky to ensure that * the isc_time_t is in the range a time_t can handle. Use this * function in place of isc_time_seconds() any time you need to set a * time_t from an isc_time_t. * * Requires: \li 't' is a valid pointer. * Returns: \li Success \li Out of range / uint32_t isc_time_nanoseconds(const isc_time_t t); /%< Return the number of nanoseconds stored in a time structure. * * Notes: \li This is the number of nanoseconds in excess of the number of seconds since the epoch; it will always be less than one * full second. * * Requires: \li 't' is a valid pointer. * Ensures: \li The returned value is less than 110^9. / void isc_time_formattimestamp(const isc_time_t t, char buf, unsigned int len); /%< * Format the time 't' into the buffer 'buf' of length 'len', * using a format like "30-Aug-2000 04:06:47.997" and the local time zone. * If the text does not fit in the buffer, the result is indeterminate, * but is always guaranteed to be null terminated. * * Requires: \li 'len' > 0 \li 'buf' points to an array of at least len chars * / void isc_time_formathttptimestamp(const isc_time_t t, char buf, unsigned int len); /%< * Format the time 't' into the buffer 'buf' of length 'len', * using a format like "Mon, 30 Aug 2000 04:06:47 GMT" * If the text does not fit in the buffer, the result is indeterminate, * but is always guaranteed to be null terminated. * * Requires: \li 'len' > 0 \li 'buf' points to an array of at least len chars * / isc_result_t isc_time_parsehttptimestamp(char input, isc_time_t t); /%< * Parse the time in 'input' into the isc_time_t pointed to by 't', * expecting a format like "Mon, 30 Aug 2000 04:06:47 GMT" * * Requires: \li 'buf' and 't' are not NULL. / void isc_time_formatISO8601(const isc_time_t t, char buf, unsigned int len); /%< Format the time 't' into the buffer 'buf' of length 'len', * using the ISO8601 format: "yyyy-mm-ddThh:mm:ssZ" * If the text does not fit in the buffer, the result is indeterminate, * but is always guaranteed to be null terminated. * * Requires: \li 'len' > 0 \li 'buf' points to an array of at least len chars * / void isc_time_formatISO8601ms(const isc_time_t t, char buf, unsigned int len); /%< * Format the time 't' into the buffer 'buf' of length 'len', * using the ISO8601 format: "yyyy-mm-ddThh:mm:ss.sssZ" * If the text does not fit in the buffer, the result is indeterminate, * but is always guaranteed to be null terminated. * * Requires: \li 'len' > 0 \li 'buf' points to an array of at least len chars * / ISC_LANG_ENDDECLS #endif / ISC_TIME_H */ Back

Edit File : time.h | Size : 8.67 KB

/*
 * Copyright (C) Internet Systems Consortium, Inc. ("ISC")
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, you can obtain one at https://mozilla.org/MPL/2.0/.
 *
 * See the COPYRIGHT file distributed with this work for additional
 * information regarding copyright ownership.
 */

#ifndef ISC_TIME_H
#define ISC_TIME_H 1

/*! \file */

#include <inttypes.h>
#include <stdbool.h>

#include <isc/lang.h>
#include <isc/types.h>

/***
 *** Intervals
 ***/

/*!
 *  \brief
 * The contents of this structure are private, and MUST NOT be accessed
 * directly by callers.
 *
 * The contents are exposed only to allow callers to avoid dynamic allocation.
 */
struct isc_interval {
	unsigned int seconds;
	unsigned int nanoseconds;
};

extern const isc_interval_t * const isc_interval_zero;

/*
 * ISC_FORMATHTTPTIMESTAMP_SIZE needs to be 30 in C locale and potentially
 * more for other locales to handle longer national abbreviations when
 * expanding strftime's %a and %b.
 */
#define ISC_FORMATHTTPTIMESTAMP_SIZE 50

ISC_LANG_BEGINDECLS

void
isc_interval_set(isc_interval_t *i,
		 unsigned int seconds, unsigned int nanoseconds);
/*%<
 * Set 'i' to a value representing an interval of 'seconds' seconds and
 * 'nanoseconds' nanoseconds, suitable for use in isc_time_add() and
 * isc_time_subtract().
 *
 * Requires:
 *
 *\li	't' is a valid pointer.
 *\li	nanoseconds < 1000000000.
 */

bool
isc_interval_iszero(const isc_interval_t *i);
/*%<
 * Returns true iff. 'i' is the zero interval.
 *
 * Requires:
 *
 *\li	'i' is a valid pointer.
 */

/***
 *** Absolute Times
 ***/

/*%
 * The contents of this structure are private, and MUST NOT be accessed
 * directly by callers.
 *
 * The contents are exposed only to allow callers to avoid dynamic allocation.
 */

struct isc_time {
	unsigned int	seconds;
	unsigned int	nanoseconds;
};

extern const isc_time_t * const isc_time_epoch;

void
isc_time_set(isc_time_t *t, unsigned int seconds, unsigned int nanoseconds);
/*%<
 * Set 't' to a value which represents the given number of seconds and
 * nanoseconds since 00:00:00 January 1, 1970, UTC.
 *
 * Notes:
 *\li	The Unix version of this call is equivalent to:
 *\code
 *	isc_time_settoepoch(t);
 *	isc_interval_set(i, seconds, nanoseconds);
 *	isc_time_add(t, i, t);
 *\endcode
 *
 * Requires:
 *\li	't' is a valid pointer.
 *\li	nanoseconds < 1000000000.
 */

void
isc_time_settoepoch(isc_time_t *t);
/*%<
 * Set 't' to the time of the epoch.
 *
 * Notes:
 *\li	The date of the epoch is platform-dependent.
 *
 * Requires:
 *
 *\li	't' is a valid pointer.
 */

bool
isc_time_isepoch(const isc_time_t *t);
/*%<
 * Returns true iff. 't' is the epoch ("time zero").
 *
 * Requires:
 *
 *\li	't' is a valid pointer.
 */

#ifdef CLOCK_BOOTTIME
isc_result_t
isc_time_boottime(isc_time_t *t);
/*%<
 * Set 't' to monotonic time from previous boot
 * it's not affected by system time change. It also
 * includes the time system was suspended
 *
 * Requires:
 *\li	't' is a valid pointer.
 *
 * Returns:
 *
 *\li	Success
 *\li	Unexpected error
 *		Getting the time from the system failed.
 */
#endif /* CLOCK_BOOTTIME */

isc_result_t
isc_time_now(isc_time_t *t);
/*%<
 * Set 't' to the current absolute time.
 *
 * Requires:
 *
 *\li	't' is a valid pointer.
 *
 * Returns:
 *
 *\li	Success
 *\li	Unexpected error
 *		Getting the time from the system failed.
 *\li	Out of range
 *		The time from the system is too large to be represented
 *		in the current definition of isc_time_t.
 */

isc_result_t
isc_time_nowplusinterval(isc_time_t *t, const isc_interval_t *i);
/*%<
 * Set *t to the current absolute time + i.
 *
 * Note:
 *\li	This call is equivalent to:
 *
 *\code
 *		isc_time_now(t);
 *		isc_time_add(t, i, t);
 *\endcode
 *
 * Requires:
 *
 *\li	't' and 'i' are valid pointers.
 *
 * Returns:
 *
 *\li	Success
 *\li	Unexpected error
 *		Getting the time from the system failed.
 *\li	Out of range
 *		The interval added to the time from the system is too large to
 *		be represented in the current definition of isc_time_t.
 */

int
isc_time_compare(const isc_time_t *t1, const isc_time_t *t2);
/*%<
 * Compare the times referenced by 't1' and 't2'
 *
 * Requires:
 *
 *\li	't1' and 't2' are valid pointers.
 *
 * Returns:
 *
 *\li	-1		t1 < t2		(comparing times, not pointers)
 *\li	0		t1 = t2
 *\li	1		t1 > t2
 */

isc_result_t
isc_time_add(const isc_time_t *t, const isc_interval_t *i, isc_time_t *result);
/*%<
 * Add 'i' to 't', storing the result in 'result'.
 *
 * Requires:
 *
 *\li	't', 'i', and 'result' are valid pointers.
 *
 * Returns:
 *\li	Success
 *\li	Out of range
 * 		The interval added to the time is too large to
 *		be represented in the current definition of isc_time_t.
 */

isc_result_t
isc_time_subtract(const isc_time_t *t, const isc_interval_t *i,
		  isc_time_t *result);
/*%<
 * Subtract 'i' from 't', storing the result in 'result'.
 *
 * Requires:
 *
 *\li	't', 'i', and 'result' are valid pointers.
 *
 * Returns:
 *\li	Success
 *\li	Out of range
 *		The interval is larger than the time since the epoch.
 */

uint64_t
isc_time_microdiff(const isc_time_t *t1, const isc_time_t *t2);
/*%<
 * Find the difference in microseconds between time t1 and time t2.
 * t2 is the subtrahend of t1; ie, difference = t1 - t2.
 *
 * Requires:
 *
 *\li	't1' and 't2' are valid pointers.
 *
 * Returns:
 *\li	The difference of t1 - t2, or 0 if t1 <= t2.
 */

uint32_t
isc_time_seconds(const isc_time_t *t);
/*%<
 * Return the number of seconds since the epoch stored in a time structure.
 *
 * Requires:
 *
 *\li	't' is a valid pointer.
 */

isc_result_t
isc_time_secondsastimet(const isc_time_t *t, time_t *secondsp);
/*%<
 * Ensure the number of seconds in an isc_time_t is representable by a time_t.
 *
 * Notes:
 *\li	The number of seconds stored in an isc_time_t might be larger
 *	than the number of seconds a time_t is able to handle.  Since
 *	time_t is mostly opaque according to the ANSI/ISO standard
 *	(essentially, all you can be sure of is that it is an arithmetic type,
 *	not even necessarily integral), it can be tricky to ensure that
 *	the isc_time_t is in the range a time_t can handle.  Use this
 *	function in place of isc_time_seconds() any time you need to set a
 *	time_t from an isc_time_t.
 *
 * Requires:
 *\li	't' is a valid pointer.
 *
 * Returns:
 *\li	Success
 *\li	Out of range
 */

uint32_t
isc_time_nanoseconds(const isc_time_t *t);
/*%<
 * Return the number of nanoseconds stored in a time structure.
 *
 * Notes:
 *\li	This is the number of nanoseconds in excess of the number
 *	of seconds since the epoch; it will always be less than one
 *	full second.
 *
 * Requires:
 *\li	't' is a valid pointer.
 *
 * Ensures:
 *\li	The returned value is less than 1*10^9.
 */

void
isc_time_formattimestamp(const isc_time_t *t, char *buf, unsigned int len);
/*%<
 * Format the time 't' into the buffer 'buf' of length 'len',
 * using a format like "30-Aug-2000 04:06:47.997" and the local time zone.
 * If the text does not fit in the buffer, the result is indeterminate,
 * but is always guaranteed to be null terminated.
 *
 *  Requires:
 *\li      'len' > 0
 *\li      'buf' points to an array of at least len chars
 *
 */

void
isc_time_formathttptimestamp(const isc_time_t *t, char *buf, unsigned int len);
/*%<
 * Format the time 't' into the buffer 'buf' of length 'len',
 * using a format like "Mon, 30 Aug 2000 04:06:47 GMT"
 * If the text does not fit in the buffer, the result is indeterminate,
 * but is always guaranteed to be null terminated.
 *
 *  Requires:
 *\li      'len' > 0
 *\li      'buf' points to an array of at least len chars
 *
 */

isc_result_t
isc_time_parsehttptimestamp(char *input, isc_time_t *t);
/*%<
 * Parse the time in 'input' into the isc_time_t pointed to by 't',
 * expecting a format like "Mon, 30 Aug 2000 04:06:47 GMT"
 *
 *  Requires:
 *\li      'buf' and 't' are not NULL.
 */

void
isc_time_formatISO8601(const isc_time_t *t, char *buf, unsigned int len);
/*%<
 * Format the time 't' into the buffer 'buf' of length 'len',
 * using the ISO8601 format: "yyyy-mm-ddThh:mm:ssZ"
 * If the text does not fit in the buffer, the result is indeterminate,
 * but is always guaranteed to be null terminated.
 *
 *  Requires:
 *\li      'len' > 0
 *\li      'buf' points to an array of at least len chars
 *
 */

void
isc_time_formatISO8601ms(const isc_time_t *t, char *buf, unsigned int len);
/*%<
 * Format the time 't' into the buffer 'buf' of length 'len',
 * using the ISO8601 format: "yyyy-mm-ddThh:mm:ss.sssZ"
 * If the text does not fit in the buffer, the result is indeterminate,
 * but is always guaranteed to be null terminated.
 *
 *  Requires:
 *\li      'len' > 0
 *\li      'buf' points to an array of at least len chars
 *
 */

ISC_LANG_ENDDECLS

#endif /* ISC_TIME_H */

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