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123 lines
5.0 KiB
123 lines
5.0 KiB
/******************************************************************************** |
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* timer_gettime.c |
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* |
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* Copyright (C) 2007 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 <time.h> |
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#include <errno.h> |
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#include "clock_internal.h" |
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#include "timer_internal.h" |
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#ifndef CONFIG_DISABLE_POSIX_TIMERS |
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/******************************************************************************** |
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* 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 Data |
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********************************************************************************/ |
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/******************************************************************************** |
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* Private Functions |
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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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* Name: timer_gettime |
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* |
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* Description: |
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* The timer_gettime() function will store the amount of time until the |
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* specified timer, timerid, expires and the reload value of the timer into the |
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* space pointed to by the value argument. The it_value member of this structure |
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* will contain the amount of time before the timer expires, or zero if the timer |
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* is disarmed. This value is returned as the interval until timer expiration, |
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* even if the timer was armed with absolute time. The it_interval member of |
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* value will contain the reload value last set by timer_settime(). |
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* |
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* Parameters: |
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* timerid - The pre-thread timer, previously created by the call to |
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* timer_create(), whose remaining time count will be returned.. |
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* |
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* Return Value: |
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* If the timer_gettime() succeeds, a value of 0 (OK) will be returned. |
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* If an error occurs, the value -1 (ERROR) will be returned, and errno set to |
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* indicate the error. |
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* |
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* EINVAL - The timerid argument does not correspond to an ID returned by |
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* timer_create() but not yet deleted by timer_delete(). |
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* |
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* Assumptions/Limitations: |
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* Due to the asynchronous operation of this function, the time reported |
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* by this function could be significantly more than that actual time |
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* remaining on the timer at any time. |
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* |
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********************************************************************************/ |
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int timer_gettime(timer_t timerid, FAR struct itimerspec *value) |
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{ |
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FAR struct posix_timer_s *timer = (FAR struct posix_timer_s *)timerid; |
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int ticks; |
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if (!timer || !value) |
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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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/* Get the number of ticks before the underlying watchdog expires */ |
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ticks = wd_gettime(timer->pt_wdog); |
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/* Convert that to a struct timespec and return it */ |
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(void)clock_ticks2time(ticks, &value->it_value); |
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(void)clock_ticks2time(timer->pt_last, &value->it_interval); |
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return OK; |
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} |
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#endif /* CONFIG_DISABLE_POSIX_TIMERS */
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