150 lines
4.3 KiB
C
150 lines
4.3 KiB
C
/****************************************************************************
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* net/udp/udp_close.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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#if defined(CONFIG_NET) && defined(CONFIG_NET_UDP)
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#include <errno.h>
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#include <debug.h>
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#include <assert.h>
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#include <net/if.h>
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#include <nuttx/net/net.h>
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#include <nuttx/net/netdev.h>
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#include <nuttx/net/udp.h>
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#include "devif/devif.h"
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#include "netdev/netdev.h"
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#include "udp/udp.h"
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#include "socket/socket.h"
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: udp_close
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*
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* Description:
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* Break any current UDP connection
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*
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* Input Parameters:
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* conn - UDP connection structure
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*
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* Returned Value:
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* None
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*
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* Assumptions:
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* Called from normal user-level logic
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*
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****************************************************************************/
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int udp_close(FAR struct socket *psock)
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{
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FAR struct udp_conn_s *conn;
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unsigned int timeout = UINT_MAX;
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int ret;
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/* Lock the network to avoid race conditions */
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net_lock();
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conn = (FAR struct udp_conn_s *)psock->s_conn;
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DEBUGASSERT(conn != NULL);
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#ifdef CONFIG_NET_SOLINGER
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/* SO_LINGER
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* Lingers on a close() if data is present. This option controls the
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* action taken when unsent messages queue on a socket and close() is
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* performed. If SO_LINGER is set, the system shall block the calling
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* thread during close() until it can transmit the data or until the
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* time expires. If SO_LINGER is not specified, and close() is issued,
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* the system handles the call in a way that allows the calling thread
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* to continue as quickly as possible. This option takes a linger
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* structure, as defined in the <sys/socket.h> header, to specify the
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* state of the option and linger interval.
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*/
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if (_SO_GETOPT(conn->sconn.s_options, SO_LINGER))
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{
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timeout = _SO_TIMEOUT(conn->sconn.s_linger);
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}
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#endif
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/* Wait until for the buffered TX data to be sent. */
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UNUSED(timeout);
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ret = udp_txdrain(psock, timeout);
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if (ret < 0)
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{
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/* udp_txdrain may fail, but that won't stop us from closing
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* the socket.
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*/
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nerr("ERROR: udp_txdrain() failed: %d\n", ret);
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}
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#ifdef CONFIG_NET_UDP_BINDTODEVICE
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/* Is the socket bound to an interface device */
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if (conn->boundto != 0)
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{
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FAR struct net_driver_s *dev;
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/* Yes, get the interface that we are bound do. NULL would indicate
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* that the interface no longer exists for some reason.
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*/
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dev = netdev_findbyindex(conn->boundto);
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if (dev != NULL)
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{
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/* Clear the interface flag to unbind the device from the socket.
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*/
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IFF_CLR_BOUND(dev->d_flags);
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}
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}
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#endif
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#ifdef CONFIG_NET_UDP_WRITE_BUFFERS
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/* Free any semi-permanent write buffer callback in place. */
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if (conn->sndcb != NULL)
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{
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udp_callback_free(conn->dev, conn, conn->sndcb);
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conn->sndcb = NULL;
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}
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#endif
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/* And free the connection structure */
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conn->crefs = 0;
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udp_free(psock->s_conn);
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net_unlock();
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return OK;
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}
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#endif /* CONFIG_NET && CONFIG_NET_UDP */
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