99 lines
3.4 KiB
C
99 lines
3.4 KiB
C
/****************************************************************************
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* libc/time/lib_gettimeofday.c
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*
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* Copyright (C) 2009, 2015 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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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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#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 = ts.tv_nsec / NSEC_PER_USEC;
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}
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return ret;
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}
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