nuttx/libs/libc/time/lib_settimeofday.c

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/****************************************************************************
* libs/libc/time/lib_settimeofday.c
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership. The
* ASF licenses this file to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance with the
* License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations
* under the License.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <sys/time.h>
#include <errno.h>
#include <nuttx/clock.h>
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: settimeofday
*
* Description:
* Set the current time
*
* Conforming to SVr4, 4.3BSD. POSIX.1-2001 describes gettimeofday() but
* not settimeofday().
*
* NuttX implements settimeofday() as a thin layer around clock_settime();
*
* Input Parameters:
* tv - The net to time to be set
* tz - Ignored
*
* Returned Value:
* Zero (OK) on success; -1 is returned on failure with the errno variable
* set appropriately.
*
****************************************************************************/
int settimeofday(FAR const struct timeval *tv, FAR struct timezone *tz)
{
struct timespec ts;
#ifdef CONFIG_DEBUG_FEATURES
if (!tv || tv->tv_usec >= USEC_PER_SEC)
{
set_errno(EINVAL);
return ERROR;
}
#endif
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/* Convert the timeval to a timespec */
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ts.tv_sec = tv->tv_sec;
ts.tv_nsec = tv->tv_usec * NSEC_PER_USEC;
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/* Let clock_settime do the work */
return clock_settime(CLOCK_REALTIME, &ts);
}