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https://github.com/marqs85/ossc
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126 lines
4.8 KiB
C
126 lines
4.8 KiB
C
/******************************************************************************
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* *
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* License Agreement *
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* *
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* Copyright (c) 2004 Altera Corporation, San Jose, California, USA. *
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* All rights reserved. *
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* *
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* Permission is hereby granted, free of charge, to any person obtaining a *
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* copy of this software and associated documentation files (the "Software"), *
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* to deal in the Software without restriction, including without limitation *
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* the rights to use, copy, modify, merge, publish, distribute, sublicense, *
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* and/or sell copies of the Software, and to permit persons to whom the *
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* Software is furnished to do so, subject to the following conditions: *
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* *
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* The above copyright notice and this permission notice shall be included in *
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* all copies or substantial portions of the Software. *
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* *
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR *
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, *
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE *
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER *
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING *
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER *
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* DEALINGS IN THE SOFTWARE. *
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* *
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* This agreement shall be governed in all respects by the laws of the State *
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* of California and by the laws of the United States of America. *
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* *
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* Altera does not recommend, suggest or require that this reference design *
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* file be used in conjunction or combination with any other product. *
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******************************************************************************/
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#include <sys/time.h>
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#include <sys/times.h>
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#include <errno.h>
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#include "sys/alt_alarm.h"
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#include "alt_types.h"
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#include "os/alt_syscall.h"
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/*
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* Macro defining the number of micoseconds in a second.
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*/
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#define ALT_US (1000000)
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/*
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* "alt_timezone" and "alt_resettime" are the values of the the reset time and
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* time zone set through the last call to settimeofday(). By default they are
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* zero initialised.
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*/
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struct timezone alt_timezone = {0, 0};
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struct timeval alt_resettime = {0, 0};
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/*
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* gettimeofday() can be called to obtain a time structure which indicates the
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* current "wall clock" time. This is calculated using the elapsed number of
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* system clock ticks, and the value of "alt_resettime" and "alt_timezone" set
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* through the last call to settimeofday().
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*
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* Warning: if this function is called concurrently with a call to
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* settimeofday(), the value returned by gettimeofday() will be unreliable.
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*
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* ALT_GETTIMEOFDAY is mapped onto the gettimeofday() system call in
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* alt_syscall.h
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*/
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#if defined (__GNUC__) && (__GNUC__ >= 4)
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int ALT_GETTIMEOFDAY (struct timeval *ptimeval, void *ptimezone_vptr)
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{
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struct timezone *ptimezone = (struct timezone*)ptimezone_vptr;
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#else
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int ALT_GETTIMEOFDAY (struct timeval *ptimeval, struct timezone *ptimezone)
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{
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#endif
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alt_u32 nticks = alt_nticks ();
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alt_u32 tick_rate = alt_ticks_per_second ();
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/*
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* Check to see if the system clock is running. This is indicated by a
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* non-zero system clock rate. If the system clock is not running, an error
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* is generated and the contents of "ptimeval" and "ptimezone" are not
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* updated.
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*/
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if (tick_rate)
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{
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ptimeval->tv_sec = alt_resettime.tv_sec + nticks/tick_rate;
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ptimeval->tv_usec = alt_resettime.tv_usec +
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(alt_u32)(((alt_u64)nticks*(ALT_US/tick_rate))%ALT_US);
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while(ptimeval->tv_usec < 0) {
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if (ptimeval->tv_sec <= 0)
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{
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ptimeval->tv_sec = 0;
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ptimeval->tv_usec = 0;
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break;
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}
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else
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{
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ptimeval->tv_sec--;
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ptimeval->tv_usec += ALT_US;
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}
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}
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while(ptimeval->tv_usec >= ALT_US) {
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ptimeval->tv_sec++;
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ptimeval->tv_usec -= ALT_US;
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}
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if (ptimezone)
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{
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ptimezone->tz_minuteswest = alt_timezone.tz_minuteswest;
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ptimezone->tz_dsttime = alt_timezone.tz_dsttime;
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}
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return 0;
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}
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return -ENOTSUP;
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}
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