d50b1778f7
move the accept logic into connect flow. In order to successfully establish a blocking connection between the client and server on the same thread. nonblock is not affected, and the block connect is now the same as the nonblock flow, other apis are not affected. Signed-off-by: zhanghongyu <zhanghongyu@xiaomi.com>
730 lines
24 KiB
C
730 lines
24 KiB
C
/****************************************************************************
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* net/local/local.h
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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#ifndef __NET_LOCAL_LOCAL_H
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#define __NET_LOCAL_LOCAL_H
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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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#include <sys/types.h>
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#include <sys/un.h>
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#include <stdint.h>
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#include <stdbool.h>
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#include <stdint.h>
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#include <poll.h>
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#include <nuttx/fs/fs.h>
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#include <nuttx/queue.h>
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#include <nuttx/net/net.h>
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#include <nuttx/mutex.h>
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#include <nuttx/semaphore.h>
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#ifdef CONFIG_NET_LOCAL
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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#define LOCAL_NPOLLWAITERS 2
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#define LOCAL_NCONTROLFDS 4
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#define LOCAL_SEND_LIMIT (CONFIG_DEV_FIFO_SIZE - sizeof(uint16_t))
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/****************************************************************************
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* Public Type Definitions
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****************************************************************************/
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/* Local, Unix domain socket types */
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enum local_type_e
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{
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LOCAL_TYPE_UNNAMED = 0, /* A Unix socket that is not bound to any name */
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LOCAL_TYPE_PATHNAME, /* lc_path holds a null terminated string */
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LOCAL_TYPE_ABSTRACT /* lc_path is length zero */
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};
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/* The state of a Unix socket */
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enum local_state_s
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{
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/* Common states */
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LOCAL_STATE_UNBOUND = 0, /* Created by socket, but not bound */
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LOCAL_STATE_BOUND, /* Bound to an path */
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/* SOCK_STREAM server only */
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LOCAL_STATE_LISTENING, /* Server listening for connections */
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/* SOCK_STREAM peers only */
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LOCAL_STATE_ACCEPT, /* Client waiting for a connection */
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LOCAL_STATE_CONNECTED, /* Peer connected */
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LOCAL_STATE_DISCONNECTED /* Peer disconnected */
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};
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/* Representation of a local connection. There are four types of
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* connection structures:
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*
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* 1. Server. A SOCK_STREAM that only listens for and accepts
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* connections from server.
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* 2. Client. A SOCK_STREAM peer that connects via the server.
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* 3. Peer. A connected SOCK_STREAM that sends() and recvs() packets.
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* May either be the client that connect with the server of the
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* new peer connect generated with the connection was accepted by
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* the server.
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*
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* And
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*
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* 4. Connectionless. Like a peer but using a connectionless datagram
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* style of communication. SOCK_DRAM support has not yet been
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* implemented.
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*/
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struct devif_callback_s; /* Forward reference */
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struct local_conn_s
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{
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/* Common prologue of all connection structures. */
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struct socket_conn_s lc_conn;
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/* Local-socket specific content follows */
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/* Fields common to SOCK_STREAM and SOCK_DGRAM */
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uint8_t lc_crefs; /* Reference counts on this instance */
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uint8_t lc_proto; /* SOCK_STREAM or SOCK_DGRAM */
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uint8_t lc_type; /* See enum local_type_e */
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uint8_t lc_state; /* See enum local_state_e */
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struct file lc_infile; /* File for read-only FIFO (peers) */
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struct file lc_outfile; /* File descriptor of write-only FIFO (peers) */
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char lc_path[UNIX_PATH_MAX]; /* Path assigned by bind() */
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int32_t lc_instance_id; /* Connection instance ID for stream
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* server<->client connection pair */
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#ifdef CONFIG_NET_LOCAL_DGRAM
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uint16_t pktlen; /* Read-ahead packet length */
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#endif /* CONFIG_NET_LOCAL_DGRAM */
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FAR struct local_conn_s *
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lc_peer; /* Peer connection instance */
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#ifdef CONFIG_NET_LOCAL_SCM
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uint16_t lc_cfpcount; /* Control file pointer counter */
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FAR struct file *
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lc_cfps[LOCAL_NCONTROLFDS]; /* Socket message control filep */
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struct ucred lc_cred; /* The credentials of connection instance */
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#endif /* CONFIG_NET_LOCAL_SCM */
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mutex_t lc_sendlock; /* Make sending multi-thread safe */
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mutex_t lc_polllock; /* Lock for net poll */
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#ifdef CONFIG_NET_LOCAL_STREAM
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/* SOCK_STREAM fields common to both client and server */
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sem_t lc_waitsem; /* Use to wait for a connection to be accepted */
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FAR struct socket *lc_psock; /* A reference to the socket structure */
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/* The following is a list if poll structures of threads waiting for
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* socket events.
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*/
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struct pollfd *lc_event_fds[LOCAL_NPOLLWAITERS];
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struct pollfd lc_inout_fds[2*LOCAL_NPOLLWAITERS];
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/* Union of fields unique to SOCK_STREAM client, server, and connected
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* peers.
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*/
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union
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{
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/* Fields unique to the SOCK_STREAM server side */
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struct
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{
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uint8_t lc_pending; /* Number of pending connections */
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uint8_t lc_backlog; /* Maximum number of pending connections */
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dq_queue_t lc_waiters; /* List of connections waiting to be accepted */
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} server;
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/* Fields unique to the connecting accept side */
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struct
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{
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dq_entry_t lc_waiter; /* Linked to the lc_waiters lists */
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} accept;
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} u;
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#endif /* CONFIG_NET_LOCAL_STREAM */
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};
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/****************************************************************************
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* Public Data
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****************************************************************************/
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#ifdef __cplusplus
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# define EXTERN extern "C"
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extern "C"
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{
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#else
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# define EXTERN extern
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#endif
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/* The local socket interface */
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EXTERN const struct sock_intf_s g_local_sockif;
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/****************************************************************************
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* Public Function Prototypes
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****************************************************************************/
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struct sockaddr; /* Forward reference */
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struct socket; /* Forward reference */
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/****************************************************************************
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* Name: local_alloc
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*
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* Description:
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* Allocate a new, uninitialized local connection structure. This is
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* normally something done by the implementation of the socket() API
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*
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****************************************************************************/
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FAR struct local_conn_s *local_alloc(void);
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/****************************************************************************
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* Name: local_alloc_accept
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*
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* Description:
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* Called when a client calls connect and can find the appropriate
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* connection in LISTEN. In that case, this function will create
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* a new connection and initialize it.
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*
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****************************************************************************/
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int local_alloc_accept(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 **accept);
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/****************************************************************************
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* Name: local_free
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*
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* Description:
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* Free a local connection structure that is no longer in use. This should
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* be done by the implementation of close().
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*
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****************************************************************************/
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void local_free(FAR struct local_conn_s *conn);
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/****************************************************************************
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* Name: local_addref
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*
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* Description:
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* Increment the reference count on the underlying connection structure.
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*
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* Input Parameters:
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* conn - Socket structure of the socket whose reference count will be
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* incremented.
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*
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* Returned Value:
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* None
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*
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****************************************************************************/
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void local_addref(FAR struct local_conn_s *conn);
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/****************************************************************************
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* Name: local_subref
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*
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* Description:
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* Subtract the reference count on the underlying connection structure.
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*
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* Input Parameters:
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* conn - Socket structure of the socket whose reference count will be
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* incremented.
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*
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* Returned Value:
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* None
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*
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****************************************************************************/
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void local_subref(FAR struct local_conn_s *conn);
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/****************************************************************************
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* Name: local_nextconn
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*
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* Description:
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* Traverse the list of allocated Local connections
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*
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* Assumptions:
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* Called from network stack logic with the network stack locked
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*
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****************************************************************************/
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FAR struct local_conn_s *local_nextconn(FAR struct local_conn_s *conn);
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/****************************************************************************
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* Name: local_peerconn
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*
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* Description:
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* Traverse the connections list to find the peer
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*
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* Assumptions:
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* This function must be called with the network locked.
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*
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****************************************************************************/
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FAR struct local_conn_s *local_peerconn(FAR struct local_conn_s *conn);
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/****************************************************************************
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* Name: psock_local_bind
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*
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* Description:
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* This function implements the low-level parts of the standard local
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* bind()operation.
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*
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****************************************************************************/
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int psock_local_bind(FAR struct socket *psock,
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FAR const struct sockaddr *addr, socklen_t addrlen);
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/****************************************************************************
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* Name: psock_local_connect
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*
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* Description:
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* This function sets up a new local connection. The function will
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* automatically allocate an unused local port for the new
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* connection. However, another port can be chosen by using the
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* psock_local_bind() call, after the psock_local_connect() function has
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* been called.
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*
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* This function is called as part of the implementation of sendto
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* and recvfrom.
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*
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* Input Parameters:
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* psock - A reference to the client-side socket structure
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* addr - The address of the remote host.
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*
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****************************************************************************/
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int psock_local_connect(FAR struct socket *psock,
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FAR const struct sockaddr *addr);
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/****************************************************************************
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* Name: local_release
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*
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* Description:
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* If the local, Unix domain socket is in the connected state, then
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* disconnect it. Release the local connection structure in any event
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*
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* Input Parameters:
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* conn - A reference to local connection structure
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*
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****************************************************************************/
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int local_release(FAR struct local_conn_s *conn);
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/****************************************************************************
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* Name: local_listen
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*
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* Description:
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* To accept connections, a socket is first created with psock_socket(), a
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* willingness to accept incoming connections and a queue limit for
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* incoming connections are specified with psock_listen(), and then the
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* connections are accepted with psock_accept(). For the case of local
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* Unix sockets, psock_listen() calls this function. The psock_listen()
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* call applies only to sockets of type SOCK_STREAM or SOCK_SEQPACKET.
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*
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* Input Parameters:
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* psock Reference to an internal, boound socket structure.
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* backlog The maximum length the queue of pending connections may grow.
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* If a connection request arrives with the queue full, the client
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* may receive an error with an indication of ECONNREFUSED or,
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* if the underlying protocol supports retransmission, the request
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* may be ignored so that retries succeed.
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*
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* Returned Value:
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* On success, zero is returned. On error, a negated errno value is
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* returned. See listen() for the set of appropriate error values.
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*
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****************************************************************************/
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#ifdef CONFIG_NET_LOCAL_STREAM
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int local_listen(FAR struct socket *psock, int backlog);
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#endif
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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'
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* 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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#ifdef CONFIG_NET_LOCAL_STREAM
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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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int flags);
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#endif
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/****************************************************************************
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* Name: local_sendmsg
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*
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* Description:
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* Implements the sendmsg() operation for the case of the local Unix socket
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*
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* Input Parameters:
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* psock A pointer to a NuttX-specific, internal socket structure
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* msg msg to send
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* flags Send flags
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*
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* Returned Value:
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* On success, returns the number of characters sent. On error, a negated
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* errno value is returned (see sendmsg() for the list of appropriate error
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* values.
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*
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****************************************************************************/
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ssize_t local_sendmsg(FAR struct socket *psock, FAR struct msghdr *msg,
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int flags);
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/****************************************************************************
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* Name: local_send_packet
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*
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* Description:
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* Send a packet on the write-only FIFO.
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*
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* Input Parameters:
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* filep File structure of write-only FIFO.
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* buf Data to send
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* len Length of data to send
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* preamble Flag to indicate the preamble sync header assembly
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*
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* Returned Value:
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* Zero is returned on success; a negated errno value is returned on any
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* failure.
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*
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****************************************************************************/
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int local_send_packet(FAR struct file *filep, FAR const struct iovec *buf,
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size_t len, bool preamble);
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/****************************************************************************
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* Name: local_recvmsg
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*
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* Description:
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* recvmsg() receives messages from a local socket and may be used to
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* receive data on a socket whether or not it is connection-oriented.
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*
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* If from is not NULL, and the underlying protocol provides the source
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* address, this source address is filled in. The argument fromlen
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* initialized to the size of the buffer associated with from, and modified
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* on return to indicate the actual size of the address stored there.
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*
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* Input Parameters:
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* psock A pointer to a NuttX-specific, internal socket structure
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* msg Buffer to receive the message
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* flags Receive flags (ignored for now)
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*
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* Returned Value:
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* On success, returns the number of characters received. If no data is
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* available to be received and the peer has performed an orderly shutdown,
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* recvmsg() will return 0. Otherwise, on errors, a negated errno value is
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* returned (see recvmsg() for the list of appropriate error values).
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*
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****************************************************************************/
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ssize_t local_recvmsg(FAR struct socket *psock, FAR struct msghdr *msg,
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int flags);
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/****************************************************************************
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* Name: local_fifo_read
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*
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* Description:
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* Read a data from the read-only FIFO.
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*
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* Input Parameters:
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* filep - File structure of write-only FIFO.
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* buf - Local to store the received data
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* len - Length of data to receive [in]
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* Length of data actually received [out]
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* once - Flag to indicate the buf may only be read once
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*
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* Returned Value:
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* Zero is returned on success; a negated errno value is returned on any
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* failure. If -ECONNRESET is received, then the sending side has closed
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* the FIFO. In this case, the returned data may still be valid (if the
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* returned len > 0).
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*
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****************************************************************************/
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int local_fifo_read(FAR struct file *filep, FAR uint8_t *buf,
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size_t *len, bool once);
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|
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/****************************************************************************
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* Name: local_getaddr
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*
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* Description:
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* Return the Unix domain address of a connection.
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*
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* Input Parameters:
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* conn - The connection
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* addr - The location to return the address
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* addrlen - The size of the memory allocate by the caller to receive the
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* address.
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*
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* Returned Value:
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* Zero (OK) on success; a negated errno value on failure.
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*
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****************************************************************************/
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int local_getaddr(FAR struct local_conn_s *conn, FAR struct sockaddr *addr,
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FAR socklen_t *addrlen);
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|
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/****************************************************************************
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* Name: local_sync
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*
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* Description:
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* Read a sync bytes until the start of the packet is found.
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*
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* Input Parameters:
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* filep - File structure of write-only FIFO.
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*
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* Returned Value:
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* The non-zero size of the following packet is returned on success; a
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* negated errno value is returned on any failure.
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*
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****************************************************************************/
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int local_sync(FAR struct file *filep);
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|
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/****************************************************************************
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* Name: local_create_fifos
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*
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* Description:
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* Create the FIFO pair needed for a SOCK_STREAM connection.
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*
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****************************************************************************/
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int local_create_fifos(FAR struct local_conn_s *conn);
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|
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/****************************************************************************
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* Name: local_create_halfduplex
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*
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* Description:
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* Create the half-duplex FIFO needed for SOCK_DGRAM communication.
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*
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****************************************************************************/
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#ifdef CONFIG_NET_LOCAL_DGRAM
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int local_create_halfduplex(FAR struct local_conn_s *conn,
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FAR const char *path);
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#endif
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|
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/****************************************************************************
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* Name: local_release_fifos
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*
|
|
* Description:
|
|
* Release references to the FIFO pair used for a SOCK_STREAM connection.
|
|
*
|
|
****************************************************************************/
|
|
|
|
int local_release_fifos(FAR struct local_conn_s *conn);
|
|
|
|
/****************************************************************************
|
|
* Name: local_release_halfduplex
|
|
*
|
|
* Description:
|
|
* Release a reference to the FIFO used for SOCK_DGRAM communication
|
|
*
|
|
****************************************************************************/
|
|
|
|
#ifdef CONFIG_NET_LOCAL_DGRAM
|
|
int local_release_halfduplex(FAR struct local_conn_s *conn);
|
|
#endif
|
|
|
|
/****************************************************************************
|
|
* Name: local_open_client_rx
|
|
*
|
|
* Description:
|
|
* Only the client-side Rx FIFO.
|
|
*
|
|
****************************************************************************/
|
|
|
|
int local_open_client_rx(FAR struct local_conn_s *client, bool nonblock);
|
|
|
|
/****************************************************************************
|
|
* Name: local_open_client_tx
|
|
*
|
|
* Description:
|
|
* Only the client-side Tx FIFO.
|
|
*
|
|
****************************************************************************/
|
|
|
|
int local_open_client_tx(FAR struct local_conn_s *client, bool nonblock);
|
|
|
|
/****************************************************************************
|
|
* Name: local_open_server_rx
|
|
*
|
|
* Description:
|
|
* Only the server-side Rx FIFO.
|
|
*
|
|
****************************************************************************/
|
|
|
|
int local_open_server_rx(FAR struct local_conn_s *server, bool nonblock);
|
|
|
|
/****************************************************************************
|
|
* Name: local_open_server_tx
|
|
*
|
|
* Description:
|
|
* Only the server-side Tx FIFO.
|
|
*
|
|
****************************************************************************/
|
|
|
|
int local_open_server_tx(FAR struct local_conn_s *server, bool nonblock);
|
|
|
|
/****************************************************************************
|
|
* Name: local_open_receiver
|
|
*
|
|
* Description:
|
|
* Only the receiving side of the half duplex FIFO.
|
|
*
|
|
****************************************************************************/
|
|
|
|
#ifdef CONFIG_NET_LOCAL_DGRAM
|
|
int local_open_receiver(FAR struct local_conn_s *conn, bool nonblock);
|
|
#endif
|
|
|
|
/****************************************************************************
|
|
* Name: local_open_sender
|
|
*
|
|
* Description:
|
|
* Only the sending side of the half duplex FIFO.
|
|
*
|
|
****************************************************************************/
|
|
|
|
#ifdef CONFIG_NET_LOCAL_DGRAM
|
|
int local_open_sender(FAR struct local_conn_s *conn, FAR const char *path,
|
|
bool nonblock);
|
|
#endif
|
|
|
|
/****************************************************************************
|
|
* Name: local_event_pollnotify
|
|
****************************************************************************/
|
|
|
|
void local_event_pollnotify(FAR struct local_conn_s *conn,
|
|
pollevent_t eventset);
|
|
|
|
/****************************************************************************
|
|
* Name: local_pollsetup
|
|
*
|
|
* Description:
|
|
* Setup to monitor events on one Unix domain socket
|
|
*
|
|
* Input Parameters:
|
|
* psock - The Unix domain socket of interest
|
|
* fds - The structure describing the events to be monitored, OR NULL if
|
|
* this is a request to stop monitoring events.
|
|
*
|
|
* Returned Value:
|
|
* 0: Success; Negated errno on failure
|
|
*
|
|
****************************************************************************/
|
|
|
|
int local_pollsetup(FAR struct socket *psock, FAR struct pollfd *fds);
|
|
|
|
/****************************************************************************
|
|
* Name: local_pollteardown
|
|
*
|
|
* Description:
|
|
* Teardown monitoring of events on a Unix domain socket
|
|
*
|
|
* Input Parameters:
|
|
* psock - The Unix domain socket of interest
|
|
* fds - The structure describing the events to be monitored, OR NULL if
|
|
* this is a request to stop monitoring events.
|
|
*
|
|
* Returned Value:
|
|
* 0: Success; Negated errno on failure
|
|
*
|
|
****************************************************************************/
|
|
|
|
int local_pollteardown(FAR struct socket *psock, FAR struct pollfd *fds);
|
|
|
|
/****************************************************************************
|
|
* Name: local_generate_instance_id
|
|
*
|
|
* Description:
|
|
* Generate instance ID for stream
|
|
*
|
|
****************************************************************************/
|
|
|
|
int32_t local_generate_instance_id(void);
|
|
|
|
/****************************************************************************
|
|
* Name: local_set_pollthreshold
|
|
*
|
|
* Description:
|
|
* Set the local pollin and pollout threshold:
|
|
*
|
|
****************************************************************************/
|
|
|
|
#ifdef CONFIG_NET_LOCAL_DGRAM
|
|
int local_set_pollthreshold(FAR struct local_conn_s *conn,
|
|
unsigned long threshold);
|
|
#endif
|
|
|
|
/****************************************************************************
|
|
* Name: local_set_nonblocking
|
|
*
|
|
* Description:
|
|
* Set the local conntion to nonblocking mode
|
|
*
|
|
****************************************************************************/
|
|
|
|
int local_set_nonblocking(FAR struct local_conn_s *conn);
|
|
|
|
#undef EXTERN
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
|
|
#endif /* CONFIG_NET_LOCAL */
|
|
#endif /* __NET_LOCAL_LOCAL_H */
|