143 lines
4.8 KiB
C
143 lines
4.8 KiB
C
/****************************************************************************
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* net/socket/net_dup2.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/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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/****************************************************************************
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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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#ifdef NET_TCP_HAVE_STACK
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FAR struct tcp_conn_s *conn;
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#endif
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int ret = OK;
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/* Parts of this operation need to be atomic */
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net_lock();
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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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#ifdef CONFIG_NET_SOCKOPTS
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psock2->s_rcvtimeo = psock1->s_rcvtimeo; /* Receive timeout value (in deciseconds) */
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psock2->s_sndtimeo = psock1->s_sndtimeo; /* Send timeout value (in deciseconds) */
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#ifdef CONFIG_NET_SOLINGER
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psock2->s_linger = psock1->s_linger; /* Linger timeout value (in deciseconds) */
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#endif
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#endif
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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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#ifdef NET_TCP_HAVE_STACK
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/* For connected socket types, it is necessary to also start the network
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* monitor so that the newly cloned socket can receive a notification if
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* the network connection is lost.
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*/
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conn = (FAR struct tcp_conn_s *)psock2->s_conn;
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if ((psock2->s_domain == PF_INET ||
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psock2->s_domain == PF_INET6) &&
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psock2->s_type == SOCK_STREAM && conn &&
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(conn->tcpstateflags == TCP_ESTABLISHED ||
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conn->tcpstateflags == TCP_SYN_RCVD))
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{
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ret = tcp_start_monitor(psock2);
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/* On failure, back out the reference count on the TCP connection
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* structure. tcp_start_monitor() will fail only in the race condition
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* where the TCP connection has been lost.
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*/
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if (ret < 0)
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{
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/* There should be at least two reference counts on the connection
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* structure: At least one from the original socket and the one
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* from above where we incremented the reference count.
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* inet_close() will handle all cases.
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*
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* NOTE: As a side-effect, inet_close()will also call
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* tcp_stop_monitor() which could inform the loss of connection to
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* all open sockets on the connection structure if the reference
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* count decrements to zero.
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*/
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inet_close(psock2);
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/* The socket will not persist... reset it */
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memset(psock2, 0, sizeof(*psock2));
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}
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}
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#endif
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net_unlock();
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return ret;
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}
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