142 lines
4.7 KiB
C
142 lines
4.7 KiB
C
/****************************************************************************
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* net/netdev/netdown_notifier.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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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/types.h>
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#include <assert.h>
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#include <nuttx/wqueue.h>
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#include <nuttx/mm/iob.h>
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#include <nuttx/net/netdev.h>
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#include "netdev/netdev.h"
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#ifdef CONFIG_NETDOWN_NOTIFIER
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: netdown_notifier_setup
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*
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* Description:
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* Set up to perform a callback to the worker function when the network
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* goes down. The worker function will execute on the high priority
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* worker thread.
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*
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* Input Parameters:
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* worker - The worker function to execute on the low priority work
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* queue when data is available in the UDP read-ahead buffer.
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* dev - The network driver to be monitored
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* arg - A user-defined argument that will be available to the worker
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* function when it runs.
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* Returned Value:
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* > 0 - The notification is in place. The returned value is a key that
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* may be used later in a call to netdown_notifier_teardown().
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* == 0 - The the device is already down. No notification will be
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* provided.
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* < 0 - An unexpected error occurred and notification will occur. The
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* returned value is a negated errno value that indicates the
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* nature of the failure.
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*
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****************************************************************************/
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int netdown_notifier_setup(worker_t worker, FAR struct net_driver_s *dev,
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FAR void *arg)
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{
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struct work_notifier_s info;
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DEBUGASSERT(worker != NULL);
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/* If network driver is already down, then return zero without setting up
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* the notification.
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*/
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if ((dev->d_flags & IFF_UP) == 0)
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{
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return 0;
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}
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/* Otherwise, this is just a simple wrapper around work_notifer_setup(). */
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info.evtype = WORK_NET_DOWN;
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info.qid = LPWORK;
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info.qualifier = dev;
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info.arg = arg;
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info.worker = worker;
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return work_notifier_setup(&info);
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}
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/****************************************************************************
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* Name: netdown_notifier_teardown
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*
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* Description:
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* Eliminate a network down notification previously setup by
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* netdown_notifier_setup(). This function should only be called if the
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* notification should be aborted prior to the notification. The
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* notification will automatically be torn down after the notification.
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*
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* Input Parameters:
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* key - The key value returned from a previous call to
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* netdown_notifier_setup().
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*
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* Returned Value:
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* None.
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*
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****************************************************************************/
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void netdown_notifier_teardown(int key)
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{
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/* This is just a simple wrapper around work_notifier_teardown(). */
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work_notifier_teardown(key);
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}
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/****************************************************************************
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* Name: netdown_notifier_signal
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*
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* Description:
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* A network has gone down has been buffered. Execute worker thread
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* functions for all threads monitoring the state of the device.
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*
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* Input Parameters:
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* dev - The TCP connection where read-ahead data was just buffered.
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*
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* Returned Value:
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* None.
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*
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****************************************************************************/
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void netdown_notifier_signal(FAR struct net_driver_s *dev)
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{
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/* This is just a simple wrapper around work_notifier_signal(). */
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work_notifier_signal(WORK_NET_DOWN, dev);
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}
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#endif /* CONFIG_NETDOWN_NOTIFIER */
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