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/* Quagga Realtime Clock handling -- header
* Copyright (C) 2009 Chris Hall (GMCH), Highwayman
*
* This file is part of GNU Zebra.
*
* GNU Zebra is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published
* by the Free Software Foundation; either version 2, or (at your
* option) any later version.
*
* GNU Zebra is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with GNU Zebra; see the file COPYING. If not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#ifndef _ZEBRA_QTIME_H
#define _ZEBRA_QTIME_H
#include <stdint.h>
#include <stdlib.h>
#include <time.h>
#include <sys/time.h>
#include <unistd.h>
#include "zassert.h"
#include "config.h"
#ifndef Inline
#define Inline static inline
#endif
/*==============================================================================
* qtime_t -- signed 64-bit integer.
*
* The various time functions work in terms of the structures:
*
* timespec -- tv_secs seconds
* tv_nsecs nano-seconds
*
* timeval -- tv_secs seconds
* tv_usecs micro-seconds
*
* Given a 64-bit integer it is much easier to do operations on a 64 bit
* (signed) nano-second value. That gives 34 bits for the seconds count, which
* is > 290 years.
*/
typedef int64_t qtime_t ;
/* A qtime_t second 123456789 -- nano-seconds */
#define QTIME_SECOND 1000000000
#define TIMESPEC_SECOND 1000000000
#define TIMEVAL_SECOND 1000000
/* Macro to convert time in seconds to a qtime_t */
#define QTIME(s) ((qtime_t)((s) * QTIME_SECOND))
Inline qtime_t
timespec2qtime(struct timespec* p_ts) ;
Inline qtime_t
timeval2qtime(struct timeval* p_tv) ;
Inline struct timespec*
qtime2timespec(struct timespec* p_ts, qtime_t qt) ;
Inline struct timeval*
qtime2timeval(struct timeval* p_tv, qtime_t qt) ;
/*==============================================================================
* Clocks.
*
* Here is support for:
*
* * System Clock
*
* This can be read using either clock_gettime(CLOCK_REALTIME, &ts) or
* gettimeofday(&tv, NULL) -- which (are believed to) return the same clock,
* but in different units.
*
* * Monotonic Clock
*
* Using clock_gettime(CLOCK_MONOTONIC, &ts) if it is available, otherwise
* a manufactured equivalent using times().
*/
Inline qtime_t
qt_get_timeofday(void) ; /* gettimeofday(&tv, NULL) */
Inline qtime_t
qt_get_realtime(void) ; /* clock_gettime(CLOCK_REALTIME, &ts) */
Inline qtime_t
qt_get_monotonic(void) ; /* clock_gettime(CLOCK_MONOTONIC, &ts */
/* OR equivalent using times() */
/* Function to manufacture a monotonic clock. */
extern qtime_t qt_craft_monotonic(void) ;
/*==============================================================================
* Inline conversion functions
*/
/* Convert timespec to qtime_t
*
* Returns qtime_t value.
*/
Inline qtime_t
timespec2qtime(struct timespec* p_ts)
{
return ((qtime_t)(p_ts->tv_sec) * QTIME_SECOND) + p_ts->tv_nsec ;
} ;
/* Convert timeval to qtime_t
*
* Returns qtime_t value.
*/
Inline qtime_t
timeval2qtime(struct timeval* p_tv)
{
return ((qtime_t)(p_tv->tv_sec) * QTIME_SECOND) + (p_tv->tv_usec * 1000) ;
} ;
/* Convert qtime_t to timespec
*
* Takes address of struct timespec and returns that address.
*/
Inline struct timespec*
qtime2timespec(struct timespec* p_ts, qtime_t qt)
{
lldiv_t imd = lldiv(qt, QTIME_SECOND) ;
p_ts->tv_sec = imd.quot ;
p_ts->tv_nsec = imd.rem ;
return p_ts ;
} ;
/* Convert timespec to qtime_t
*
* Takes address of struct timespec and returns that address.
*/
Inline struct timeval*
qtime2timeval(struct timeval* p_tv, qtime_t qt)
{
lldiv_t imd = lldiv(qt, QTIME_SECOND) ;
p_tv->tv_sec = imd.quot ;
p_tv->tv_usec = imd.rem / 1000 ;
return p_tv ;
} ;
/*==============================================================================
* Inline Clock Functions.
*/
/* Read given clock & return a qtime_t value.
*
* Crunch, zabbort_errno, if fails: cannot continue with broken time value !
*/
Inline qtime_t
qt_clock_gettime(clockid_t clock_id)
{
struct timespec ts ;
if (clock_gettime(clock_id, &ts) != 0)
zabort_errno("clock_gettime failed") ;
return timespec2qtime(&ts) ;
} ;
/* gettimeofday(&tv, NULL) -- returning qtime_t value
*/
Inline qtime_t
qt_get_timeofday(void)
{
struct timeval tv ;
gettimeofday(&tv, NULL) ;
return timeval2qtime(&tv) ;
}
/* clock_gettime(CLOCK_REALTIME, &ts) -- returning qtime_t value
*
* Crunch, zabbort_errno, if fails: cannot continue with broken time value !
*/
Inline qtime_t
qt_get_realtime(void)
{
return qt_clock_gettime(CLOCK_REALTIME) ;
} ;
/* clock_gettime(CLOCK_MONOTONIC, &ts) OR qt_craft_monotonic()
* -- returning qtime_t value
*
* Crunch, zabbort_errno, if fails: cannot continue with broken time value !
*/
Inline qtime_t
qt_get_monotonic(void)
{
#ifdef HAVE_CLOCK_MONOTONIC
return qt_clock_gettime(CLOCK_MONOTONIC) ;
#else
return qt_craft_monotonic() ;
#endif
} ;
#endif /* _ZEBRA_QTIME_H */
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