W. Eric Norum
120 lines
2.6 KiB
C++
120 lines
2.6 KiB
C++
/*************************************************************************\
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* Copyright (c) 2002 The University of Saskatchewan
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* EPICS BASE Versions 3.13.7
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* and higher are distributed subject to a Software License Agreement found
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* in file LICENSE that is included with this distribution.
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\*************************************************************************/
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/*
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* $Id$
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*
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* Author: W. Eric Norum
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*/
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//
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/*
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* ANSI C
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*/
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#include <time.h>
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#include <limits.h>
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/*
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* RTEMS
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*/
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#include <rtems.h>
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#include <rtems/rtems_bsdnet.h>
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/*
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* EPICS
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*/
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#define epicsExportSharedSymbols
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#include "epicsTime.h"
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#include "errlog.h"
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extern "C" {
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/*
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* RTEMS clock rate
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*/
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rtems_interval rtemsTicksPerSecond;
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double rtemsTicksPerSecond_double;
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/*
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* RTEMS time begins January 1, 1988 (local time).
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* EPICS time begins January 1, 1990 (GMT).
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*
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* FIXME: How to handle daylight-savings time?
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*/
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#define EPICS_EPOCH_SEC_PAST_RTEMS_EPOCH ((366+365)*86400)
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static unsigned long timeoffset;
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/*
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* Get current time
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* Allow for this to be called before clockInit() and before
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* system time and date have been initialized.
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*/
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int epicsTimeGetCurrent (epicsTimeStamp *pDest)
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{
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struct timeval curtime;
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rtems_interval t;
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rtems_status_code sc;
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for (;;) {
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sc = rtems_clock_get (RTEMS_CLOCK_GET_TIME_VALUE, &curtime);
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if (sc == RTEMS_SUCCESSFUL)
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break;
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else if (sc != RTEMS_NOT_DEFINED)
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return epicsTimeERROR;
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sc = rtems_clock_get (RTEMS_CLOCK_GET_TICKS_PER_SECOND, &t);
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if (sc != RTEMS_SUCCESSFUL)
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return epicsTimeERROR;
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rtems_task_wake_after (t);
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}
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pDest->nsec = curtime.tv_usec * 1000;
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pDest->secPastEpoch = curtime.tv_sec - timeoffset;
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return epicsTimeOK;
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}
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/*
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* epicsTimeGetEvent ()
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*/
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int epicsTimeGetEvent (epicsTimeStamp *pDest, int eventNumber)
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{
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if (eventNumber==epicsTimeEventCurrentTime) {
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return epicsTimeGetCurrent (pDest);
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}
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else {
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return epicsTimeERROR;
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}
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}
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void clockInit(void)
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{
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timeoffset = EPICS_EPOCH_SEC_PAST_RTEMS_EPOCH - rtems_bsdnet_timeoffset;
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rtems_clock_get (RTEMS_CLOCK_GET_TICKS_PER_SECOND, &rtemsTicksPerSecond);
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rtemsTicksPerSecond_double = rtemsTicksPerSecond;
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}
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int epicsTime_gmtime ( const time_t *pAnsiTime, struct tm *pTM )
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{
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struct tm * pRet = gmtime_r ( pAnsiTime, pTM );
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if ( pRet ) {
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return epicsTimeOK;
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}
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else {
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return epicsTimeERROR;
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}
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}
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int epicsTime_localtime ( const time_t *clock, struct tm *result )
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{
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struct tm * pRet = localtime_r ( clock, result );
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if ( pRet ) {
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return epicsTimeOK;
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}
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else {
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return epicsTimeERROR;
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}
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}
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} /* extern "C" */
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