nuttx/net/local/local_conn.c
anjiahao d1d46335df Replace nxsem API when used as a lock with nxmutex API
Signed-off-by: anjiahao <anjiahao@xiaomi.com>
Signed-off-by: Xiang Xiao <xiaoxiang@xiaomi.com>
2022-10-17 15:59:46 +09:00

229 lines
6.4 KiB
C

/****************************************************************************
* net/local/local_conn.c
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership. The
* ASF licenses this file to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance with the
* License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations
* under the License.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#if defined(CONFIG_NET) && defined(CONFIG_NET_LOCAL)
#include <string.h>
#include <assert.h>
#include <errno.h>
#include <debug.h>
#include <nuttx/kmalloc.h>
#include <nuttx/queue.h>
#include "local/local.h"
/****************************************************************************
* Private Data
****************************************************************************/
/* A list of all allocated packet socket connections */
static dq_queue_t g_local_connections;
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: local_nextconn
*
* Description:
* Traverse the list of local connections
*
* Assumptions:
* This function must be called with the network locked.
*
****************************************************************************/
FAR struct local_conn_s *local_nextconn(FAR struct local_conn_s *conn)
{
if (!conn)
{
return (FAR struct local_conn_s *)g_local_connections.head;
}
return (FAR struct local_conn_s *)conn->lc_conn.node.flink;
}
/****************************************************************************
* Name: local_peerconn
*
* Description:
* Traverse the connections list to find the peer
*
* Assumptions:
* This function must be called with the network locked.
*
****************************************************************************/
FAR struct local_conn_s *local_peerconn(FAR struct local_conn_s *conn)
{
FAR struct local_conn_s *peer = NULL;
while ((peer = local_nextconn(peer)) != NULL)
{
if (conn->lc_proto == peer->lc_proto && conn != peer &&
!strncmp(conn->lc_path, peer->lc_path, UNIX_PATH_MAX - 1))
{
return peer;
}
}
return NULL;
}
/****************************************************************************
* Name: local_alloc()
*
* Description:
* Allocate a new, uninitialized Unix domain socket connection structure.
* This is normally something done by the implementation of the socket()
* API
*
****************************************************************************/
FAR struct local_conn_s *local_alloc(void)
{
FAR struct local_conn_s *conn =
(FAR struct local_conn_s *)kmm_zalloc(sizeof(struct local_conn_s));
if (conn != NULL)
{
/* Initialize non-zero elements the new connection structure. Since
* Since the memory was allocated with kmm_zalloc(), it is not
* necessary to zerio-ize any structure elements.
*/
#ifdef CONFIG_NET_LOCAL_STREAM
/* This semaphore is used for signaling and, hence, should not have
* priority inheritance enabled.
*/
nxsem_init(&conn->lc_waitsem, 0, 0);
nxsem_set_protocol(&conn->lc_waitsem, SEM_PRIO_NONE);
nxsem_init(&conn->lc_donesem, 0, 0);
nxsem_set_protocol(&conn->lc_donesem, SEM_PRIO_NONE);
#endif
/* This semaphore is used for sending safely in multithread.
* Make sure data will not be garbled when multi-thread sends.
*/
nxmutex_init(&conn->lc_sendlock);
/* Add the connection structure to the list of listeners */
net_lock();
dq_addlast(&conn->lc_conn.node, &g_local_connections);
net_unlock();
}
return conn;
}
/****************************************************************************
* Name: local_free()
*
* Description:
* Free a packet Unix domain connection structure that is no longer in use.
* This should be done by the implementation of close().
*
****************************************************************************/
void local_free(FAR struct local_conn_s *conn)
{
#ifdef CONFIG_NET_LOCAL_SCM
int i;
#endif /* CONFIG_NET_LOCAL_SCM */
DEBUGASSERT(conn != NULL);
/* Remove the server from the list of listeners. */
net_lock();
dq_rem(&conn->lc_conn.node, &g_local_connections);
#ifdef CONFIG_NET_LOCAL_SCM
if (local_peerconn(conn) && conn->lc_peer)
{
conn->lc_peer->lc_peer = NULL;
conn->lc_peer = NULL;
}
#endif /* CONFIG_NET_LOCAL_SCM */
net_unlock();
/* Make sure that the read-only FIFO is closed */
if (conn->lc_infile.f_inode != NULL)
{
file_close(&conn->lc_infile);
conn->lc_infile.f_inode = NULL;
}
/* Make sure that the write-only FIFO is closed */
if (conn->lc_outfile.f_inode != NULL)
{
file_close(&conn->lc_outfile);
conn->lc_outfile.f_inode = NULL;
}
#ifdef CONFIG_NET_LOCAL_SCM
/* Free the pending control file pointer */
for (i = 0; i < conn->lc_cfpcount; i++)
{
if (conn->lc_cfps[i])
{
file_close(conn->lc_cfps[i]);
kmm_free(conn->lc_cfps[i]);
conn->lc_cfps[i] = NULL;
}
}
#endif /* CONFIG_NET_LOCAL_SCM */
#ifdef CONFIG_NET_LOCAL_STREAM
/* Destroy all FIFOs associted with the connection */
local_release_fifos(conn);
nxsem_destroy(&conn->lc_waitsem);
nxsem_destroy(&conn->lc_donesem);
#endif
/* Destory sem associated with the connection */
nxmutex_destroy(&conn->lc_sendlock);
/* And free the connection structure */
kmm_free(conn);
}
#endif /* CONFIG_NET && CONFIG_NET_LOCAL */