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zhanghongyu
8506259b79
dup2 and setsockopt can use the lock in conn to protect resources, the lock in accept is originally used to protect the connection status. however, only the send, recv, netpoll, and connect processes will check this flag. only when the interface returns will the corresponding conn structure be exposed to the caller, and then the above operations can be performed. Therefore, this net_lock is not necessary. Signed-off-by: zhanghongyu <zhanghongyu@xiaomi.com>
92 lines
3.1 KiB
C
92 lines
3.1 KiB
C
/****************************************************************************
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* net/socket/net_dup2.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/socket.h>
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#include <string.h>
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#include <sched.h>
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#include <assert.h>
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#include <errno.h>
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#include <debug.h>
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#include <nuttx/net/net.h>
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#include <nuttx/net/tcp.h>
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#include "inet/inet.h"
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#include "tcp/tcp.h"
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#include "socket/socket.h"
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#include "utils/utils.h"
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: psock_dup2
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*
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* Description:
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* Performs the low level, common portion of dup
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*
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* Input Parameters:
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* psock1 - The existing socket that is being cloned.
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* psock2 - A reference to an uninitialized socket structure allocated by
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* the caller.
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*
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* Returned Value:
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* Zero (OK) is returned on success; a negated errno value is returned on
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* any failure.
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*
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****************************************************************************/
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int psock_dup2(FAR struct socket *psock1, FAR struct socket *psock2)
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{
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/* Parts of this operation need to be atomic */
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conn_lock(psock1->s_conn);
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/* Duplicate the relevant socket state (zeroing everything else) */
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memset(psock2, 0, sizeof(struct socket));
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psock2->s_domain = psock1->s_domain; /* IP domain: PF_INET, PF_INET6, or PF_PACKET */
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psock2->s_type = psock1->s_type; /* Protocol type: Only SOCK_STREAM or SOCK_DGRAM */
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psock2->s_sockif = psock1->s_sockif; /* Socket interface */
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psock2->s_conn = psock1->s_conn; /* UDP or TCP connection structure */
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/* Increment the reference count on the underlying connection structure
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* for this address family type.
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*/
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DEBUGASSERT(psock2->s_sockif != NULL &&
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psock2->s_sockif->si_addref != NULL);
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psock2->s_sockif->si_addref(psock2);
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conn_unlock(psock1->s_conn);
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return OK;
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}
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