74 lines
2.3 KiB
C
74 lines
2.3 KiB
C
/****************************************************************************
|
|
* libs/libc/unistd/lib_alarm.c
|
|
*
|
|
* Licensed to the Apache Software Foundation (ASF) under one or more
|
|
* contributor license agreements. See the NOTICE file distributed with
|
|
* this work for additional information regarding copyright ownership. The
|
|
* ASF licenses this file to you under the Apache License, Version 2.0 (the
|
|
* "License"); you may not use this file except in compliance with the
|
|
* License. You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
|
|
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
|
|
* License for the specific language governing permissions and limitations
|
|
* under the License.
|
|
*
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Included Files
|
|
****************************************************************************/
|
|
|
|
#include <nuttx/config.h>
|
|
|
|
#include <unistd.h>
|
|
#include <sys/time.h>
|
|
|
|
/****************************************************************************
|
|
* Public Functions
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Name: alarm
|
|
*
|
|
* Description:
|
|
* The alarm() function will arranges for a SIGALRM signal to be delivered
|
|
* to the calling process in seconds seconds.
|
|
*
|
|
* Interactions between alarm() and any of setitimer() are unspecified.
|
|
*
|
|
* Input Parameters:
|
|
* seconds - The number of seconds to alarm
|
|
*
|
|
* Returned Value:
|
|
* alarm() returns the number of seconds remaining until any previously
|
|
* scheduled alarm was due to be delivered, or zero if there was no
|
|
* previously scheduled alarm.
|
|
*
|
|
* Assumptions:
|
|
*
|
|
****************************************************************************/
|
|
|
|
unsigned int alarm(unsigned int seconds)
|
|
{
|
|
struct itimerval value =
|
|
{
|
|
{0, 0},
|
|
{0, 0}
|
|
};
|
|
|
|
struct itimerval ovalue =
|
|
{
|
|
{0, 0},
|
|
{0, 0}
|
|
};
|
|
|
|
value.it_value.tv_sec = seconds;
|
|
setitimer(ITIMER_REAL, &value, &ovalue);
|
|
|
|
return ovalue.it_value.tv_sec;
|
|
}
|