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110 lines
4.0 KiB
110 lines
4.0 KiB
/**************************************************************************** |
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* libc/time/lib_time.c |
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* |
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* Copyright (C) 2011 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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#ifndef CONFIG_DISABLE_CLOCK |
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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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#endif /* !CONFIG_DISABLE_CLOCK */
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