275 lines
8.5 KiB
C
275 lines
8.5 KiB
C
/****************************************************************************
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* net/local/local_accept.c
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*
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* Copyright (C) 2015, 2017 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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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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#if defined(CONFIG_NET) && defined(CONFIG_NET_LOCAL_STREAM)
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#include <string.h>
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#include <errno.h>
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#include <assert.h>
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#include <queue.h>
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#include <debug.h>
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#include <nuttx/semaphore.h>
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#include <nuttx/net/net.h>
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#include "socket/socket.h"
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#include "local/local.h"
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Name: local_waitlisten
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****************************************************************************/
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static int local_waitlisten(FAR struct local_conn_s *server)
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{
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int ret;
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/* Loop until a connection is requested or we receive a signal */
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while (dq_empty(&server->u.server.lc_waiters))
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{
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/* No.. wait for a connection or a signal */
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ret = net_lockedwait(&server->lc_waitsem);
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if (ret < 0)
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{
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DEBUGASSERT(ret == -EINTR || ret == -ECANCELED);
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return ret;
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}
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}
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/* There is a client waiting for the connection */
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return OK;
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}
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: local_accept
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*
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* Description:
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* This function implements accept() for Unix domain sockets. See the
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* description of accept() for further information.
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*
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* Input Parameters:
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* psock The listening Unix domain socket structure
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* addr Receives the address of the connecting client
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* addrlen Input: allocated size of 'addr', Return: returned size of 'addr'
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* newconn The new, accepted Unix domain connection structure
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*
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* Returned Value:
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* Returns zero (OK) on success or a negated errno value on failure.
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* See the description of accept of the possible errno values in the
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* description of accept().
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*
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* Assumptions:
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* Network is NOT locked.
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*
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****************************************************************************/
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int local_accept(FAR struct socket *psock, FAR struct sockaddr *addr,
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FAR socklen_t *addrlen, FAR struct socket *newsock)
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{
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FAR struct local_conn_s *server;
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FAR struct local_conn_s *client;
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FAR struct local_conn_s *conn;
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int ret;
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/* Some sanity checks */
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DEBUGASSERT(psock && psock->s_conn);
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DEBUGASSERT(newsock && !newsock->s_conn);
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/* Is the socket a stream? */
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if (psock->s_domain != PF_LOCAL || psock->s_type != SOCK_STREAM)
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{
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return -EOPNOTSUPP;
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}
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/* Verify that a valid memory block has been provided to receive the
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* address
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*/
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server = (FAR struct local_conn_s *)psock->s_conn;
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if (server->lc_proto != SOCK_STREAM ||
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server->lc_state != LOCAL_STATE_LISTENING ||
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server->lc_type != LOCAL_TYPE_PATHNAME)
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{
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return -EOPNOTSUPP;
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}
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/* Loop as necessary if we have to wait for a connection */
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for (; ; )
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{
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/* Are there pending connections. Remove the client from the
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* head of the waiting list.
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*/
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client = (FAR struct local_conn_s *)
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dq_remfirst(&server->u.server.lc_waiters);
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if (client)
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{
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/* Decrement the number of pending clients */
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DEBUGASSERT(server->u.server.lc_pending > 0);
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server->u.server.lc_pending--;
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/* Create a new connection structure for the server side of the
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* connection.
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*/
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conn = local_alloc();
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if (!conn)
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{
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nerr("ERROR: Failed to allocate new connection structure\n");
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ret = -ENOMEM;
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}
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else
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{
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/* Initialize the new connection structure */
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conn->lc_crefs = 1;
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conn->lc_proto = SOCK_STREAM;
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conn->lc_type = LOCAL_TYPE_PATHNAME;
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conn->lc_state = LOCAL_STATE_CONNECTED;
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strncpy(conn->lc_path, client->lc_path, UNIX_PATH_MAX - 1);
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conn->lc_path[UNIX_PATH_MAX - 1] = '\0';
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conn->lc_instance_id = client->lc_instance_id;
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/* Open the server-side write-only FIFO. This should not
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* block.
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*/
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ret = local_open_server_tx(conn,
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_SS_ISNONBLOCK(psock->s_flags));
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if (ret < 0)
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{
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nerr("ERROR: Failed to open write-only FIFOs for %s: %d\n",
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conn->lc_path, ret);
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}
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}
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/* Do we have a connection? Is the write-side FIFO opened? */
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if (ret == OK)
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{
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DEBUGASSERT(conn->lc_outfile.f_inode != NULL);
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/* Open the server-side read-only FIFO. This should not
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* block because the client side has already opening it
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* for writing.
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*/
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ret = local_open_server_rx(conn,
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_SS_ISNONBLOCK(psock->s_flags));
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if (ret < 0)
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{
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nerr("ERROR: Failed to open read-only FIFOs for %s: %d\n",
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conn->lc_path, ret);
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}
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}
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/* Do we have a connection? Are the FIFOs opened? */
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if (ret == OK)
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{
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DEBUGASSERT(conn->lc_infile.f_inode != NULL);
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/* Return the address family */
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if (addr != NULL)
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{
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ret = local_getaddr(client, addr, addrlen);
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}
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}
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if (ret == OK)
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{
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/* Setup the client socket structure */
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newsock->s_domain = psock->s_domain;
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newsock->s_type = SOCK_STREAM;
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newsock->s_sockif = psock->s_sockif;
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newsock->s_conn = (FAR void *)conn;
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}
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/* Signal the client with the result of the connection */
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client->u.client.lc_result = ret;
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nxsem_post(&client->lc_waitsem);
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return ret;
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}
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/* No.. then there should be no pending connections */
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DEBUGASSERT(server->u.server.lc_pending == 0);
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/* Was the socket opened non-blocking? */
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if (_SS_ISNONBLOCK(psock->s_flags))
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{
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/* Yes.. return EAGAIN */
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return -EAGAIN;
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}
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/* Otherwise, listen for a connection and try again. */
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ret = local_waitlisten(server);
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if (ret < 0)
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{
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return ret;
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}
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}
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}
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#endif /* CONFIG_NET && CONFIG_NET_LOCAL_STREAM */
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