88 lines
3.1 KiB
C
88 lines
3.1 KiB
C
/****************************************************************************
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* lib/lib_alarm.c
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*
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* Copyright (C) 2019 Xiaomi Inc. All rights reserved.
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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 <unistd.h>
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#include <sys/time.h>
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: alarm
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*
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* Description:
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* The alarm() function will arranges for a SIGALRM signal to be delivered
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* to the calling process in seconds seconds.
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*
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* Interactions between alarm() and any of setitimer() are unspecified.
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*
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* Input Parameters:
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* seconds - The number of seconds to alarm
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*
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* Returned Value:
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* alarm() returns the number of seconds remaining until any previously
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* scheduled alarm was due to be delivered, or zero if there was no
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* previously scheduled alarm.
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*
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* Assumptions:
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*
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****************************************************************************/
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unsigned int alarm(unsigned int seconds)
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{
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struct itimerval value =
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{
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{0, 0},
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{0, 0}
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};
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struct itimerval ovalue =
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{
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{0, 0},
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{0, 0}
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};
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value.it_value.tv_sec = seconds;
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setitimer(ITIMER_REAL, &value, &ovalue);
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return ovalue.it_value.tv_sec;
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}
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