249 lines
8.2 KiB
C
249 lines
8.2 KiB
C
/********************************************************************************
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* include/time.h
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*
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* Copyright (C) 2007-2011, 2013-2015, 2017 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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********************************************************************************/
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#ifndef __INCLUDE_TIME_H
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#define __INCLUDE_TIME_H
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/********************************************************************************
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* Included Files
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********************************************************************************/
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#include <nuttx/config.h>
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#include <nuttx/compiler.h>
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#include <sys/types.h>
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#include <stdint.h>
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/********************************************************************************
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* Pre-processor Definitions
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********************************************************************************/
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/* Clock tick of the system (frequency Hz).
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*
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* NOTE: This symbolic name CLK_TCK has been removed from the standard. It is
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* replaced with CLOCKS_PER_SEC. Both are defined here.
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*
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* The default value is 100Hz, but this default setting can be overridden by
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* defining the clock interval in microseconds as CONFIG_USEC_PER_TICK in the
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* board configuration file.
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*/
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#ifdef CONFIG_USEC_PER_TICK
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# define CLK_TCK (1000000/CONFIG_USEC_PER_TICK)
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# define CLOCKS_PER_SEC (1000000/CONFIG_USEC_PER_TICK)
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#else
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# define CLK_TCK (100)
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# define CLOCKS_PER_SEC (100)
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#endif
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/* CLOCK_REALTIME refers to the standard time source. For most
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* implementations, the standard time source is the system timer interrupt.
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* However, if the platform supports an RTC, then the standard time source
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* will be the RTC for the clock_gettime() and clock_settime() interfaces
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* (the system timer is still the time source for all of the interfaces).
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*
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* CLOCK_REALTIME represents the machine's best-guess as to the current
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* wall-clock, time-of-day time. This means that CLOCK_REALTIME can jump
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* forward and backward as the system time-of-day clock is changed.
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*/
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#define CLOCK_REALTIME 0
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/* Clock that cannot be set and represents monotonic time since some
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* unspecified starting point. It is not affected by changes in the
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* system time-of-day clock.
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*/
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#ifdef CONFIG_CLOCK_MONOTONIC
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# define CLOCK_MONOTONIC 1
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#endif
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/* This is a flag that may be passed to the timer_settime() and
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* clock_nanosleep() functions.
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*/
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#define TIMER_ABSTIME 1
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#ifndef CONFIG_LIBC_LOCALTIME
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/* Local time is the same as gmtime in this implementation */
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# define localtime(c) gmtime(c)
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# define localtime_r(c,r) gmtime_r(c,r)
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#endif
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/********************************************************************************
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* Public Types
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********************************************************************************/
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/* Scalar types */
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typedef uint32_t time_t; /* Holds time in seconds */
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typedef uint8_t clockid_t; /* Identifies one time base source */
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typedef FAR void *timer_t; /* Represents one POSIX timer */
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/* struct timespec is the standard representation of time as seconds and
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* nanoseconds.
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*/
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struct timespec
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{
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time_t tv_sec; /* Seconds */
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long tv_nsec; /* Nanoseconds */
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};
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/* struct tm is the standard representation for "broken out" time.
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*
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* REVISIT: This structure could be packed better using uint8_t's and
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* uint16_t's. The standard definition does, however, call out type int for
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* all of the members. NOTE: Any changes to this structure must be also be
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* reflected in struct rtc_time defined in include/nuttx/timers/rtc.h; these
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* two structures must be cast compatible.
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*/
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struct tm
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{
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int tm_sec; /* Seconds (0-61, allows for leap seconds) */
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int tm_min; /* Minutes (0-59) */
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int tm_hour; /* Hours (0-23) */
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int tm_mday; /* Day of the month (1-31) */
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int tm_mon; /* Month (0-11) */
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int tm_year; /* Years since 1900 */
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int tm_wday; /* Day of the week (0-6) */
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int tm_yday; /* Day of the year (0-365) */
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int tm_isdst; /* Non-0 if daylight savings time is in effect */
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};
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/* Struct itimerspec is used to define settings for an interval timer */
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struct itimerspec
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{
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struct timespec it_value; /* First time */
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struct timespec it_interval; /* and thereafter */
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};
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/* forward reference (defined in signal.h) */
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struct sigevent;
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/********************************************************************************
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* Public Data
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********************************************************************************/
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#undef EXTERN
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#if defined(__cplusplus)
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#define EXTERN extern "C"
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extern "C"
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{
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#else
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#define EXTERN extern
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#endif
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#ifdef CONFIG_LIBC_LOCALTIME
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/* daylight - Daylight savings time flag */
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/* EXTERN int daylight; not supported */
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/* timezone - Difference from UTC and local standard time */
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/* EXTERN long int timezone; not supported */
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/* tzname[] - Timezone strings
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* Setup by tzset()
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*/
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EXTERN FAR char *tzname[2];
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#endif
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/********************************************************************************
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* Public Function Prototypes
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********************************************************************************/
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clock_t clock(void);
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int clock_settime(clockid_t clockid, FAR const struct timespec *tp);
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int clock_gettime(clockid_t clockid, FAR struct timespec *tp);
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int clock_getres(clockid_t clockid, FAR struct timespec *res);
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time_t mktime(FAR struct tm *tp);
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FAR struct tm *gmtime(FAR const time_t *timep);
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FAR struct tm *gmtime_r(FAR const time_t *timep, FAR struct tm *result);
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#ifdef CONFIG_LIBC_LOCALTIME
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FAR struct tm *localtime(FAR const time_t *timep);
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FAR struct tm *localtime_r(FAR const time_t *timep, FAR struct tm *result);
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#endif
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size_t strftime(FAR char *s, size_t max, FAR const char *format,
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FAR const struct tm *tm);
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FAR char *asctime(FAR const struct tm *tp);
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FAR char *asctime_r(FAR const struct tm *tp, FAR char *buf);
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FAR char *ctime(FAR const time_t *timep);
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FAR char *ctime_r(FAR const time_t *timep, FAR char *buf);
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time_t time(FAR time_t *timep);
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#ifdef CONFIG_HAVE_DOUBLE
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double difftime(time_t time1, time_t time0);
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#else
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float difftime(time_t time1, time_t time0);
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#endif
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int timer_create(clockid_t clockid, FAR struct sigevent *evp,
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FAR timer_t *timerid);
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int timer_delete(timer_t timerid);
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int timer_settime(timer_t timerid, int flags,
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FAR const struct itimerspec *value,
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FAR struct itimerspec *ovalue);
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int timer_gettime(timer_t timerid, FAR struct itimerspec *value);
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int timer_getoverrun(timer_t timerid);
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int clock_nanosleep(clockid_t clockid, int flags,
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FAR const struct timespec *rqtp,
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FAR struct timespec *rmtp);
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int nanosleep(FAR const struct timespec *rqtp, FAR struct timespec *rmtp);
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#ifdef CONFIG_LIBC_LOCALTIME
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void tzset(void);
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#endif
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#undef EXTERN
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#if defined(__cplusplus)
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}
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#endif
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#endif /* __INCLUDE_TIME_H */
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