21041af8a7
As a policy, all internal OS implementations must use "detached" files which are valid in any context and do not depend on the validity of a file descriptor at any point in time. This commit converts the usage of file descriptors to detached files throughout the local socket implementation.
Squashed commit of the following:
net/local: Finish change to eliminate use of file descriptors.
net/local: A little more of the conversion.
net/local: Beginning of chnages to eliminate use of file descriptors in the local socket implementeation. poll() will be a problem.
713 lines
24 KiB
C
713 lines
24 KiB
C
/****************************************************************************
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* net/local/loal.h
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*
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* Copyright (C) 2015 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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#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 <semaphore.h>
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#include <queue.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/net/net.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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#undef HAVE_LOCAL_POLL
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#ifndef CONFIG_DISABLE_POLL
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# define HAVE_LOCAL_POLL 1
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# define LOCAL_ACCEPT_NPOLLWAITERS 2
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#endif
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/* Packet format in FIFO:
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*
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* 1. Sync bytes (7 at most)
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* 2. End/Start byte
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* 3. 16-bit packet length (in host order)
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* 4. Packet data (in host order)
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*/
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#define LOCAL_SYNC_BYTE 0x42 /* Byte in sync sequence */
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#define LOCAL_END_BYTE 0xbd /* End of sync seqence */
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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_UNTYPED = 0, /* Type is not determined until the socket is bound */
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LOCAL_TYPE_UNNAMED, /* 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 local_conn_s
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{
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/* lc_node supports a doubly linked list: Listening SOCK_STREAM servers
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* will be linked into a list of listeners; SOCK_STREAM clients will be
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* linked to the lc_waiters and lc_conn lists.
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*/
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dq_entry_t lc_node; /* Supports a doubly linked list */
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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_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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#ifdef HAVE_LOCAL_POLL
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/* The following is a list if poll structures of threads waiting for
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* socket accept events.
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*/
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struct pollfd *lc_accept_fds[LOCAL_ACCEPT_NPOLLWAITERS];
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#endif
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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 client side */
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struct
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{
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uint16_t lc_remaining; /* (For binary compatibility with peer) */
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volatile int lc_result; /* Result of the connection operation (client)*/
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} client;
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/* Fields common to connected peers (connected or accepted) */
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struct
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{
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uint16_t lc_remaining; /* Bytes remaining in the incoming stream */
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} peer;
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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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#ifdef CONFIG_NET_LOCAL_STREAM
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/* A list of all SOCK_STREAM listener connections */
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EXTERN dq_queue_t g_local_listeners;
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#endif
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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_initialize
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*
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* Description:
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* Initialize the local, Unix domain connection structures. Called once
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* and only from the common network initialization logic.
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*
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****************************************************************************/
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void local_initialize(void);
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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_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: 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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* 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 list() 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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* 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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#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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#endif
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/****************************************************************************
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* Name: psock_local_send
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*
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* Description:
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* Send a local packet as a stream.
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*
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* Parameters:
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* psock An instance of the internal socket structure.
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* buf Data to send
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* len Length of data to send
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* flags Send flags (ignored for now)
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*
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* Return:
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* On success, returns the number of characters sent. On error,
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* -1 is returned, and errno is set appropriately (see send() for the
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* list of errno numbers).
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*
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****************************************************************************/
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#ifdef CONFIG_NET_LOCAL_STREAM
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ssize_t psock_local_send(FAR struct socket *psock, FAR const void *buf,
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size_t len, int flags);
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#endif
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/****************************************************************************
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* Name: psock_local_sendto
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*
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* Description:
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* This function implements the Unix domain-specific logic of the
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* standard sendto() socket operation.
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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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* buf Data to send
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* len Length of data to send
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* flags Send flags
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* to Address of recipient
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* tolen The length of the address structure
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*
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* NOTE: All input parameters were verified by sendto() before this
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* function was called.
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*
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* Returned Value:
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* On success, returns the number of characters sent. On error,
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* a negated errno value is returned. See the description in
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* net/socket/sendto.c for the list of appropriate return value.
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*
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****************************************************************************/
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#ifdef CONFIG_NET_LOCAL_DGRAM
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ssize_t psock_local_sendto(FAR struct socket *psock, FAR const void *buf,
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size_t len, int flags, FAR const struct sockaddr *to,
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socklen_t tolen);
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#endif
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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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* 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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*
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* Return:
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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 uint8_t *buf,
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size_t len);
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/****************************************************************************
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* Name: local_recvfrom
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*
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* Description:
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* recvfrom() 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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* Parameters:
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* psock A pointer to a NuttX-specific, internal socket structure
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* buf Buffer to receive data
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* len Length of buffer
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* flags Receive flags (ignored for now)
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* from Address of source (may be NULL)
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* fromlen The length of the address structure
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*
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* Returned Value:
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* On success, returns the number of characters sent. If no data is
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* available to be received and the peer has performed an orderly shutdown,
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* recv() will return 0. Otherwise, on errors, -1 is returned, and errno
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* is set appropriately (see receivefrom for the complete list).
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*
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****************************************************************************/
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ssize_t local_recvfrom(FAR struct socket *psock, FAR void *buf,
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size_t len, int flags, FAR struct sockaddr *from,
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FAR socklen_t *fromlen);
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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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* 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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*
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* Return:
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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, size_t *len);
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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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* 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 allocat by the caller to receive the
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* address.
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*
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* Return:
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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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* Parameters:
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* filep - File structure of write-only FIFO.
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*
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* Return:
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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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|
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#ifdef CONFIG_NET_LOCAL_STREAM
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int local_create_fifos(FAR struct local_conn_s *conn);
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#endif
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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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* Name: local_release_fifos
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*
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* Description:
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* Release references to the FIFO pair used for a SOCK_STREAM connection.
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*
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****************************************************************************/
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#ifdef CONFIG_NET_LOCAL_STREAM
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int local_release_fifos(FAR struct local_conn_s *conn);
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#endif
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/****************************************************************************
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* Name: local_release_halfduplex
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*
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* Description:
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* Release a reference to the FIFO used 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_release_halfduplex(FAR struct local_conn_s *conn);
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#endif
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/****************************************************************************
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* Name: local_open_client_rx
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*
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* Description:
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* Only the client-side Rx FIFO.
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*
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****************************************************************************/
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#ifdef CONFIG_NET_LOCAL_STREAM
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int local_open_client_rx(FAR struct local_conn_s *client, bool nonblock);
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#endif
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/****************************************************************************
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* Name: local_open_client_tx
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*
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* Description:
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* Only the client-side Tx FIFO.
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*
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****************************************************************************/
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#ifdef CONFIG_NET_LOCAL_STREAM
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int local_open_client_tx(FAR struct local_conn_s *client, bool nonblock);
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#endif
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/****************************************************************************
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* Name: local_open_server_rx
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*
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* Description:
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* Only the server-side Rx FIFO.
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*
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****************************************************************************/
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#ifdef CONFIG_NET_LOCAL_STREAM
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int local_open_server_rx(FAR struct local_conn_s *server, bool nonblock);
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#endif
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|
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/****************************************************************************
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* Name: local_open_server_tx
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*
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* Description:
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* Only the server-side Tx FIFO.
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*
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|
****************************************************************************/
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#ifdef CONFIG_NET_LOCAL_STREAM
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int local_open_server_tx(FAR struct local_conn_s *server, bool nonblock);
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#endif
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|
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/****************************************************************************
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* Name: local_open_receiver
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|
*
|
|
* Description:
|
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* Only the receiving side of the half duplex FIFO.
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|
*
|
|
****************************************************************************/
|
|
|
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#ifdef CONFIG_NET_LOCAL_DGRAM
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int local_open_receiver(FAR struct local_conn_s *conn, bool nonblock);
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#endif
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|
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/****************************************************************************
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|
* Name: local_open_sender
|
|
*
|
|
* Description:
|
|
* Only the sending side of the half duplex FIFO.
|
|
*
|
|
****************************************************************************/
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|
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#ifdef CONFIG_NET_LOCAL_DGRAM
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int local_open_sender(FAR struct local_conn_s *conn, FAR const char *path,
|
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bool nonblock);
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#endif
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|
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|
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/****************************************************************************
|
|
* Name: local_accept_pollnotify
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|
****************************************************************************/
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|
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#ifdef HAVE_LOCAL_POLL
|
|
void local_accept_pollnotify(FAR struct local_conn_s *conn,
|
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pollevent_t eventset);
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#else
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#define local_accept_pollnotify(conn, eventset) ((void)(conn))
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#endif
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|
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/****************************************************************************
|
|
* 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
|
|
*
|
|
****************************************************************************/
|
|
|
|
#ifdef HAVE_LOCAL_POLL
|
|
int local_pollsetup(FAR struct socket *psock, FAR struct pollfd *fds);
|
|
#endif
|
|
|
|
/****************************************************************************
|
|
* 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
|
|
*
|
|
****************************************************************************/
|
|
|
|
#ifdef HAVE_LOCAL_POLL
|
|
int local_pollteardown(FAR struct socket *psock, FAR struct pollfd *fds);
|
|
#endif
|
|
|
|
#undef EXTERN
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
|
|
#endif /* CONFIG_NET_LOCAL */
|
|
#endif /* __NET_LOCAL_LOCAL_H */
|