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192 lines
6.8 KiB
192 lines
6.8 KiB
/******************************************************************************** |
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* include/time.h |
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* |
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* Copyright (C) 2007-2011 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 <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 milliseconds as CONFIG_MSEC_PER_TICK in the |
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* board configuration file. |
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*/ |
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#ifdef CONFIG_MSEC_PER_TICK |
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# define CLK_TCK (1000/CONFIG_MSEC_PER_TICK) |
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# define CLOCKS_PER_SEC (1000/CONFIG_MSEC_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 implementations, |
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* the standard time source is the system timer interrupt. However, if the |
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* platform supports an RTC, then the standard time source will be the RTC |
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* for the clock_gettime() and clock_settime() interfaces (the system timer |
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* is still the time source for all of the interfaces). |
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*/ |
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#define CLOCK_REALTIME 0 |
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/* If an RTC is supported, then the non-standard CLOCK_ACTIVETIME is also |
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* supported to manage time based on the system timer interrupt separately from |
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* the RTC. This may be necessary, for example, in certain cases where the |
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* system timer interrupt has been stopped in low power modes. |
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* |
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* CLOCK_ACTIVETIME is only recognized by clock_gettime() and clock_settime(). |
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*/ |
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#ifdef CONFIG_RTC |
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# define CLOCK_ACTIVETIME 1 |
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#else |
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# define CLOCK_ACTIVETIME CLOCK_REALTIME |
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#endif |
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/* This is a flag that may be passed to the timer_settime() function */ |
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#define TIMER_ABSTIME 1 |
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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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/******************************************************************************** |
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* Global Type Declarations |
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********************************************************************************/ |
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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 |
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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 timeval |
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{ |
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time_t tv_sec; /* Seconds */ |
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long tv_usec; /* Microseconds */ |
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}; |
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struct tm |
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{ |
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int tm_sec; /* second (0-61, allows for leap seconds) */ |
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int tm_min; /* minute (0-59) */ |
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int tm_hour; /* hour (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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#if 0 /* not supported */ |
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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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#endif |
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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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* Global Variables |
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********************************************************************************/ |
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/* extern char *tznames[]; not supported */ |
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/******************************************************************************** |
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* Global Function Prototypes |
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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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#else |
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#define EXTERN extern |
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#endif |
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EXTERN clock_t clock(void); |
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EXTERN int clock_settime(clockid_t clockid, const struct timespec *tp); |
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EXTERN int clock_gettime(clockid_t clockid, struct timespec *tp); |
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EXTERN int clock_getres(clockid_t clockid, struct timespec *res); |
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EXTERN time_t mktime(const struct tm *tp); |
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EXTERN FAR struct tm *gmtime(FAR const time_t *timer); |
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EXTERN FAR struct tm *gmtime_r(FAR const time_t *timer, FAR struct tm *result); |
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EXTERN size_t strftime(char *s, size_t max, const char *format, const struct tm *tm); |
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EXTERN time_t time(time_t *tloc); |
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EXTERN int timer_create(clockid_t clockid, FAR struct sigevent *evp, FAR timer_t *timerid); |
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EXTERN int timer_delete(timer_t timerid); |
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EXTERN int timer_settime(timer_t timerid, int flags, FAR const struct itimerspec *value, |
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FAR struct itimerspec *ovalue); |
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EXTERN int timer_gettime(timer_t timerid, FAR struct itimerspec *value); |
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EXTERN int timer_getoverrun(timer_t timerid); |
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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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