/**************************************************************************** * net/local/local_accept.c * * Copyright (C) 2015, 2017 Gregory Nutt. All rights reserved. * Author: Gregory Nutt * * 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 #if defined(CONFIG_NET) && defined(CONFIG_NET_LOCAL_STREAM) #include #include #include #include #include #include #include #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 */