107 lines
4.0 KiB
C
107 lines
4.0 KiB
C
/****************************************************************************
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* libc/time/lib_time.c
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*
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* Copyright (C) 2011, 2014 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 <time.h>
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/****************************************************************************
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* Private Data
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****************************************************************************/
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Function: time
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*
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* Description:
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* Get the current calendar time as a time_t object. The function returns
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* this value, and if the argument is not a null pointer, the value is also
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* set to the object pointed by tloc.
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*
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* Note that this function is just a thin wrapper around gettimeofday()
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* and is provided for compatibility. gettimeofday() is the preffered way
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* to obtain system time.
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*
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* Parameters:
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* Pointer to an object of type time_t, where the time value is stored.
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* Alternativelly, this parameter can be a null pointer, in which case the
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* parameter is not used, but a time_t object is still returned by the
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* function.
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*
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* Return Value:
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* The current calendar time as a time_t object. If the argument is not
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* a null pointer, the return value is the same as the one stored in the
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* location pointed by the argument.
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*
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* If the function could not retrieve the calendar time, it returns a -1
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* value.
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*
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****************************************************************************/
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time_t time(time_t *tloc)
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{
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struct timeval tp;
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int ret;
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/* Get the current time from the system */
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ret = gettimeofday(&tp, NULL);
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if (ret == OK)
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{
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/* Return the seconds since the epoch */
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if (tloc)
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{
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*tloc = tp.tv_sec;
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}
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return tp.tv_sec;
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}
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return (time_t)ERROR;
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}
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