125 lines
3.5 KiB
C
125 lines
3.5 KiB
C
/****************************************************************************
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* net/socket/net_close.c
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*
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* SPDX-License-Identifier: Apache-2.0
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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 <sys/socket.h>
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#include <stdint.h>
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#include <string.h>
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#include <stdbool.h>
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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 <nuttx/net/net.h>
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#include "socket/socket.h"
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#ifdef CONFIG_NET
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: psock_close
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*
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* Description:
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* Performs the close operation on a socket instance
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*
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* Input Parameters:
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* psock Socket instance
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*
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* Returned Value:
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* Returns zero (OK) on success. On failure, it returns a negated errno
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* value to indicate the nature of the error.
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*
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* Assumptions:
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*
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****************************************************************************/
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int psock_close(FAR struct socket *psock)
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{
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int ret;
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/* Verify that the sockfd corresponds to valid, allocated socket */
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if (psock == NULL)
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{
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return -EBADF;
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}
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/* We perform the close operation only if this is the last count on
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* the socket. (actually, I think the socket crefs only takes the values
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* 0 and 1 right now).
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*
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* It is possible for a psock to have no connection, e.g. a TCP socket
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* waiting in accept.
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*/
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if (psock->s_conn != NULL)
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{
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FAR struct socket_conn_s *conn = psock->s_conn;
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/* Assume that the socket close operation will be successful. Save
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* the current flags and mark the socket uninitialized. This avoids
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* race conditions in the SMP case. We save the flags as a type
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* unsigned int in case the size of s_flags changes in the future
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* (currently uint8_t).
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*/
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unsigned int saveflags = conn->s_flags;
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conn->s_flags &= ~_SF_INITD;
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/* Let the address family's close() method handle the operation */
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DEBUGASSERT(psock->s_sockif != NULL &&
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psock->s_sockif->si_close != NULL);
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ret = psock->s_sockif->si_close(psock);
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/* Was the close successful */
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if (ret < 0)
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{
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/* No.. restore the socket flags */
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conn->s_flags = saveflags;
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return ret;
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}
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}
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/* The socket will not persist... reset it */
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memset(psock, 0, sizeof(*psock));
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return OK;
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}
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#endif /* CONFIG_NET */
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