nuttx/sched/timer_settime.c

/********************************************************************************
 * timer_settime.c
 *
 *   Copyright (C) 2007 Gregory Nutt. All rights reserved.
 *   Author: Gregory Nutt <spudmonkey@racsa.co.cr>
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 * 3. Neither the name Gregory Nutt nor the names of its contributors may be
 *    used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 *
 ********************************************************************************/

/********************************************************************************
 * Included Files
 ********************************************************************************/

#include <nuttx/config.h>
#include <time.h>
#include <errno.h>

#ifndef CONFIG_DISABLE_POSIX_TIMERS

/********************************************************************************
 * Definitions
 ********************************************************************************/

/********************************************************************************
 * Private Data
 ********************************************************************************/

/********************************************************************************
 * Public Data
 ********************************************************************************/

/********************************************************************************
 * Private Functions
 ********************************************************************************/

/********************************************************************************
 * Public Functions
 ********************************************************************************/

/********************************************************************************
 * Function:  timer_settime
 *
 * Description:
 *   The timer_settime() function sets the time until the next expiration of the
 *   timer specified by timerid from the it_value member of the value argument
 *   and arm the timer if the it_value member of value is non-zero. If the
 *   specified timer was already armed when timer_settime() is called, this call
 *   will reset the time until next expiration to the value specified. If the
 *   it_value member of value is zero, the timer will be disarmed. The effect
 *   of disarming or resetting a timer with pending expiration notifications is
 *   unspecified.
 *
 *   If the flag TIMER_ABSTIME is not set in the argument flags, timer_settime()
 *   will behave as if the time until next expiration is set to be equal to the
 *   interval specified by the it_value member of value. That is, the timer will
 *   expire in it_value nanoseconds from when the call is made. If the flag
 *   TIMER_ABSTIME is set in the argument flags, timer_settime() will behave as
 *   if the time until next expiration is set to be equal to the difference between
 *   the absolute time specified by the it_value member of value and the current
 *   value of the clock associated with timerid.  That is, the timer will expire
 *   when the clock reaches the value specified by the it_value member of value.
 *   If the specified time has already passed, the function will succeed and the
 *   expiration notification will be made.
 *
 *   The reload value of the timer will be set to the value specified by the
 *   it_interval member of value.  When a timer is armed with a non-zero
 *   it_interval, a periodic (or repetitive) timer is specified.
 *
 *   Time values that are between two consecutive non-negative integer multiples
 *   of the resolution of the specified timer will be rounded up to the larger
 *   multiple of the resolution. Quantization error will not cause the timer to
 *   expire earlier than the rounded time value.
 *
 *   If the argument ovalue is not NULL, the timer_settime() function will store,
 *   in the location referenced by ovalue, a value representing the previous
 *   amount of time before the timer would have expired, or zero if the timer was
 *   disarmed, together with the previous timer reload value. Timers will not
 *   expire before their scheduled time.
 *
 * Parameters:
 *   timerid - The pre-thread timer, previously created by the call to
 *     timer_create(), to be be set.
 *   flags - Specifie characteristics of the timer (see above)
 *   value - Specifies the timer value to set
 *   ovalue - A location in which to return the time remaining from the previous
 *     timer setting.
 *
 * Return Value:
 *   If the timer_settime() succeeds, a value of 0 (OK) will be returned.
 *   If an error occurs, the value -1 (ERROR) will be returned, and errno set to
 *   indicate the error.
 *
 *   EINVAL - The timerid argument does not correspond to an ID returned by
 *     timer_create() but not yet deleted by timer_delete().
 *   EINVAL - A value structure specified a nanosecond value less than zero or
 *     greater than or equal to 1000 million, and the it_value member of that
 *     structure did not specify zero seconds and nanoseconds.
 *
 * Assumptions:
 *
 ********************************************************************************/

int timer_settime(timer_t timerid, int flags, FAR const struct itimerspec *value,
                  FAR struct itimerspec *ovalue)
{
#warning "Not Implemented"
  return ENOTSUP;
}

#endif /* CONFIG_DISABLE_POSIX_TIMERS */