86 lines
2.6 KiB
C
86 lines
2.6 KiB
C
/****************************************************************************
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* libs/libc/time/lib_gettimeofday.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <sys/time.h>
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#include <errno.h>
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#include <nuttx/clock.h>
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: gettimeofday
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*
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* Description:
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* Get the current time
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*
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* Conforming to SVr4, 4.3BSD. POSIX.1-2001 describes gettimeofday().
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* POSIX.1-2008 marks gettimeofday() as obsolete, recommending the use of
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* clock_gettime(2) instead.
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*
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* NuttX implements gettimeofday() as a thin layer around clock_gettime();
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*
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* Input Parameters:
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* tv - The location to return the current time
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* tz - Ignored
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*
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* Returned Value:
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* Zero (OK) on success; -1 is returned on failure with the errno variable
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* set appropriately.
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*
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****************************************************************************/
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int gettimeofday(FAR struct timeval *tv, FAR struct timezone *tz)
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{
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struct timespec ts;
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int ret;
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UNUSED(tz);
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#ifdef CONFIG_DEBUG_FEATURES
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if (!tv)
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{
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set_errno(EINVAL);
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return ERROR;
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}
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#endif
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/* Let clock_gettime do most of the work */
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ret = clock_gettime(CLOCK_REALTIME, &ts);
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if (ret == OK)
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{
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/* Convert the struct timespec to a struct timeval */
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tv->tv_sec = ts.tv_sec;
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tv->tv_usec = NSEC2USEC(ts.tv_nsec);
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}
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return ret;
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}
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