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px4-firmware/nuttx/include/time.h

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/********************************************************************************
* include/time.h
*
* Copyright (C) 2007-2011 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* 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 <nuttx/config.h>
#include <sys/types.h>
#include <stdint.h>
/********************************************************************************
* 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 milliseconds as CONFIG_MSEC_PER_TICK in the
* board configuration file.
*/
#ifdef CONFIG_MSEC_PER_TICK
# define CLK_TCK (1000/CONFIG_MSEC_PER_TICK)
# define CLOCKS_PER_SEC (1000/CONFIG_MSEC_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).
*/
#define CLOCK_REALTIME 0
/* If an RTC is supported, then the non-standard CLOCK_ACTIVETIME is also
* supported to manage time based on the system timer interrupt separately from
* the RTC. This may be necessary, for example, in certain cases where the
* system timer interrupt has been stopped in low power modes.
*
* CLOCK_ACTIVETIME is only recognized by clock_gettime() and clock_settime().
*/
#ifdef CONFIG_RTC
# define CLOCK_ACTIVETIME 1
#else
# define CLOCK_ACTIVETIME CLOCK_REALTIME
#endif
/* This is a flag that may be passed to the timer_settime() function */
#define TIMER_ABSTIME 1
/* Local time is the same as gmtime in this implementation */
#define localtime(c) gmtime(c)
#define localtime_r(c,r) gmtime_r(c,r)
/********************************************************************************
* Global Type Declarations
********************************************************************************/
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
{
time_t tv_sec; /* Seconds */
long tv_nsec; /* Nanoseconds */
};
struct timeval
{
time_t tv_sec; /* Seconds */
long tv_usec; /* Microseconds */
};
struct tm
{
int tm_sec; /* second (0-61, allows for leap seconds) */
int tm_min; /* minute (0-59) */
int tm_hour; /* hour (0-23) */
int tm_mday; /* day of the month (1-31) */
int tm_mon; /* month (0-11) */
int tm_year; /* years since 1900 */
#if 0 /* not supported */
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;
/********************************************************************************
* Global Variables
********************************************************************************/
/* extern char *tznames[]; not supported */
/********************************************************************************
* Global Function Prototypes
********************************************************************************/
#undef EXTERN
#if defined(__cplusplus)
#define EXTERN extern "C"
extern "C" {
#else
#define EXTERN extern
#endif
EXTERN clock_t clock(void);
EXTERN int clock_settime(clockid_t clockid, const struct timespec *tp);
EXTERN int clock_gettime(clockid_t clockid, struct timespec *tp);
EXTERN int clock_getres(clockid_t clockid, struct timespec *res);
EXTERN time_t mktime(const struct tm *tp);
EXTERN FAR struct tm *gmtime(FAR const time_t *timer);
EXTERN FAR struct tm *gmtime_r(FAR const time_t *timer, FAR struct tm *result);
EXTERN size_t strftime(char *s, size_t max, const char *format, const struct tm *tm);
EXTERN time_t time(time_t *tloc);
EXTERN int timer_create(clockid_t clockid, FAR struct sigevent *evp, FAR timer_t *timerid);
EXTERN int timer_delete(timer_t timerid);
EXTERN int timer_settime(timer_t timerid, int flags, FAR const struct itimerspec *value,
FAR struct itimerspec *ovalue);
EXTERN int timer_gettime(timer_t timerid, FAR struct itimerspec *value);
EXTERN int timer_getoverrun(timer_t timerid);
#undef EXTERN
#if defined(__cplusplus)
}
#endif
#endif /* __INCLUDE_TIME_H */
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