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- /****************************************************************************
- * net/local/local_accept.c
- *
- * Copyright (C) 2015, 2017 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_STREAM)
- #include <string.h>
- #include <errno.h>
- #include <assert.h>
- #include <queue.h>
- #include <debug.h>
- #include <nuttx/semaphore.h>
- #include <nuttx/net/net.h>
- #include "socket/socket.h"
- #include "local/local.h"
- /****************************************************************************
- * Private Functions
- ****************************************************************************/
- /****************************************************************************
- * Name: local_waitlisten
- ****************************************************************************/
- static int local_waitlisten(FAR struct local_conn_s *server)
- {
- int ret;
- /* Loop until a connection is requested or we receive a signal */
- while (dq_empty(&server->u.server.lc_waiters))
- {
- /* No.. wait for a connection or a signal */
- ret = net_lockedwait(&server->lc_waitsem);
- if (ret < 0)
- {
- DEBUGASSERT(ret == -EINTR || ret == -ECANCELED);
- return ret;
- }
- }
- /* There is a client waiting for the connection */
- return OK;
- }
- /****************************************************************************
- * Public Functions
- ****************************************************************************/
- /****************************************************************************
- * Name: local_accept
- *
- * Description:
- * This function implements accept() for Unix domain sockets. See the
- * description of accept() for further information.
- *
- * Input Parameters:
- * psock The listening Unix domain socket structure
- * addr Receives the address of the connecting client
- * addrlen Input: allocated size of 'addr', Return: returned size of 'addr'
- * newconn The new, accepted Unix domain connection structure
- *
- * Returned Value:
- * Returns zero (OK) on success or a negated errno value on failure.
- * See the description of accept of the possible errno values in the
- * description of accept().
- *
- * Assumptions:
- * Network is NOT locked.
- *
- ****************************************************************************/
- int local_accept(FAR struct socket *psock, FAR struct sockaddr *addr,
- FAR socklen_t *addrlen, FAR struct socket *newsock)
- {
- FAR struct local_conn_s *server;
- FAR struct local_conn_s *client;
- FAR struct local_conn_s *conn;
- int ret;
- /* Some sanity checks */
- DEBUGASSERT(psock && psock->s_conn);
- DEBUGASSERT(newsock && !newsock->s_conn);
- /* Is the socket a stream? */
- if (psock->s_domain != PF_LOCAL || psock->s_type != SOCK_STREAM)
- {
- return -EOPNOTSUPP;
- }
- /* Verify that a valid memory block has been provided to receive the
- * address
- */
- server = (FAR struct local_conn_s *)psock->s_conn;
- if (server->lc_proto != SOCK_STREAM ||
- server->lc_state != LOCAL_STATE_LISTENING ||
- server->lc_type != LOCAL_TYPE_PATHNAME)
- {
- return -EOPNOTSUPP;
- }
- /* Loop as necessary if we have to wait for a connection */
- for (; ; )
- {
- /* Are there pending connections. Remove the client from the
- * head of the waiting list.
- */
- client = (FAR struct local_conn_s *)
- dq_remfirst(&server->u.server.lc_waiters);
- if (client)
- {
- /* Decrement the number of pending clients */
- DEBUGASSERT(server->u.server.lc_pending > 0);
- server->u.server.lc_pending--;
- /* Create a new connection structure for the server side of the
- * connection.
- */
- conn = local_alloc();
- if (!conn)
- {
- nerr("ERROR: Failed to allocate new connection structure\n");
- ret = -ENOMEM;
- }
- else
- {
- /* Initialize the new connection structure */
- conn->lc_crefs = 1;
- conn->lc_proto = SOCK_STREAM;
- conn->lc_type = LOCAL_TYPE_PATHNAME;
- conn->lc_state = LOCAL_STATE_CONNECTED;
- strncpy(conn->lc_path, client->lc_path, UNIX_PATH_MAX - 1);
- conn->lc_path[UNIX_PATH_MAX - 1] = '\0';
- conn->lc_instance_id = client->lc_instance_id;
- /* Open the server-side write-only FIFO. This should not
- * block.
- */
- ret = local_open_server_tx(conn,
- _SS_ISNONBLOCK(psock->s_flags));
- if (ret < 0)
- {
- nerr("ERROR: Failed to open write-only FIFOs for %s: %d\n",
- conn->lc_path, ret);
- }
- }
- /* Do we have a connection? Is the write-side FIFO opened? */
- if (ret == OK)
- {
- DEBUGASSERT(conn->lc_outfile.f_inode != NULL);
- /* Open the server-side read-only FIFO. This should not
- * block because the client side has already opening it
- * for writing.
- */
- ret = local_open_server_rx(conn,
- _SS_ISNONBLOCK(psock->s_flags));
- if (ret < 0)
- {
- nerr("ERROR: Failed to open read-only FIFOs for %s: %d\n",
- conn->lc_path, ret);
- }
- }
- /* Do we have a connection? Are the FIFOs opened? */
- if (ret == OK)
- {
- DEBUGASSERT(conn->lc_infile.f_inode != NULL);
- /* Return the address family */
- if (addr != NULL)
- {
- ret = local_getaddr(client, addr, addrlen);
- }
- }
- if (ret == OK)
- {
- /* Setup the client socket structure */
- newsock->s_domain = psock->s_domain;
- newsock->s_type = SOCK_STREAM;
- newsock->s_sockif = psock->s_sockif;
- newsock->s_conn = (FAR void *)conn;
- }
- /* Signal the client with the result of the connection */
- client->u.client.lc_result = ret;
- nxsem_post(&client->lc_waitsem);
- return ret;
- }
- /* No.. then there should be no pending connections */
- DEBUGASSERT(server->u.server.lc_pending == 0);
- /* Was the socket opened non-blocking? */
- if (_SS_ISNONBLOCK(psock->s_flags))
- {
- /* Yes.. return EAGAIN */
- return -EAGAIN;
- }
- /* Otherwise, listen for a connection and try again. */
- ret = local_waitlisten(server);
- if (ret < 0)
- {
- return ret;
- }
- }
- }
- #endif /* CONFIG_NET && CONFIG_NET_LOCAL_STREAM */
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