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/****************************************************************************
* net/local/local_release.c
*
* Copyright (C) 2015 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* 3. Neither the name NuttX nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#if defined(CONFIG_NET) && defined(CONFIG_NET_LOCAL)
#include <semaphore.h>
#include <errno.h>
#include <queue.h>
#include <assert.h>
#include <nuttx/net/net.h>
#include "local/local.h"
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: local_release
*
* Description:
* If the local, Unix domain socket is in the connected state, then
* disconnect it. Release the local connection structure in any event
*
* Input Parameters:
* conn - A reference to local connection structure
*
****************************************************************************/
int local_release(FAR struct local_conn_s *conn)
{
net_lock_t state;
/* There should be no references on this structure */
DEBUGASSERT(conn->lc_crefs == 0);
state = net_lock();
/* We should not bet here with states LOCAL_STATE_CLOSED or with
* LOCAL_STATE_ACCEPT. Those are internal states that should be atomic
* with respect to socket operations.
*/
DEBUGASSERT(conn->lc_state != LOCAL_STATE_CLOSED &&
conn->lc_state != LOCAL_STATE_ACCEPT);
/* If the socket is connected (SOCK_STREAM client), then disconnect it */
if (conn->lc_state == LOCAL_STATE_CONNECTED ||
conn->lc_state == LOCAL_STATE_DISCONNECTED)
{
FAR struct local_conn_s *server;
DEBUGASSERT(conn->lc_family == SOCK_STREAM);
server = conn->u.client.lc_server;
DEBUGASSERT(server &&
(server->lc_state == LOCAL_STATE_LISTENING ||
server->lc_state == LOCAL_STATE_CLOSED) &&
!dq_empty(&server->u.server.lc_conns));
/* Remove ourself from the list of connections */
dq_rem(&conn->lc_node, &server->u.server.lc_conns);
/* Is the list of pending connections now empty? Was the connection
* already closed?
*/
if (dq_empty(&server->u.server.lc_waiters) &&
server->lc_state == LOCAL_STATE_CLOSED)
{
/* Yes, free the server connection as well */
local_free(server);
}
/* Now we can free this connection structure */
local_free(conn);
}
/* Is the socket is listening socket (SOCK_STREAM server) */
else if (conn->lc_state == LOCAL_STATE_LISTENING)
{
FAR struct local_conn_s *client;
FAR struct local_conn_s *next;
DEBUGASSERT(conn->lc_family == SOCK_STREAM);
/* Are there still clients waiting for a connection to the server? */
for (client = (FAR struct local_conn_s *)conn->u.server.lc_waiters.head;
client;
client = (FAR struct local_conn_s *)dq_next(&client->lc_node))
{
client->u.client.lc_result = -ENETUNREACH;
sem_post(&client->lc_waitsem);
conn->lc_state = LOCAL_STATE_CLOSED;
}
conn->u.server.lc_pending = 0;
/* Disconnect any previous client connections */
for (client = (FAR struct local_conn_s *)conn->u.server.lc_conns.head;
client;
client = next)
{
next = (FAR struct local_conn_s *)dq_next(&client->lc_node);
dq_rem(&client->lc_node, &conn->u.server.lc_conns);
client->lc_state = LOCAL_STATE_DISCONNECTED;
}
/* Remove the server from the list of listeners */
dq_rem(&conn->lc_node, &g_local_listeners);
/* Can we free the connection structure now? We cannot
* if there are still pending connection requested to
* be resolved.
*/
conn->u.server.lc_backlog = 0;
if (conn->lc_state == LOCAL_STATE_CLOSED)
{
local_free(conn);
}
}
/* For the remaining states (LOCAL_STATE_UNBOUND and LOCAL_STATE_UNBOUND),
* we simply free the connection structure.
*/
else
{
local_free(conn);
}
net_unlock(state);
return OK;
}
#endif /* CONFIG_NET && CONFIG_NET_LOCAL */
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