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