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97 lines
4.1 KiB
C
97 lines
4.1 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 "sys/alt_errno.h"
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#include "sys/alt_alarm.h"
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#include "os/alt_syscall.h"
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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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extern struct timezone alt_timezone;
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extern struct timeval alt_resettime;
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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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* settimeofday() can be called to calibrate the system clock, so that
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* subsequent calls to gettimeofday() will return the elapsed "wall clock"
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* time.
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*
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* This is done by updating the global structures "alt_resettime" and
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* "alt_timezone" so that an immediate call to gettimeofday() would return
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* the value specified by "t" and "tz".
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*
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* Warning: if this function is called concurrently with a call to
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* gettimeofday(), the value returned by gettimeofday() will be unreliable.
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*
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* ALT_SETTIMEOFDAY is mapped onto the settimeofday() system call in
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* alt_syscall.h
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*/
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int ALT_SETTIMEOFDAY (const struct timeval *t,
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const struct timezone *tz)
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{
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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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/* If there is a system clock available, update the current time */
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if (tick_rate)
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{
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alt_resettime.tv_sec = t->tv_sec - nticks/tick_rate;
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alt_resettime.tv_usec = t->tv_usec -
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((nticks*(ALT_US/tick_rate))%ALT_US);
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alt_timezone.tz_minuteswest = tz->tz_minuteswest;
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alt_timezone.tz_dsttime = tz->tz_dsttime;
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return 0;
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}
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/* There's no system clock available */
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ALT_ERRNO = ENOSYS;
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return -1;
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}
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