847 lines
28 KiB
C
847 lines
28 KiB
C
/****************************************************************************
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* net/udp/udp.h
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*
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* Copyright (C) 2014-2015, 2018 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_UDP_UDP_H
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#define __NET_UDP_UDP_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/socket.h>
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#include <queue.h>
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#include <nuttx/clock.h>
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#include <nuttx/net/ip.h>
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#ifdef CONFIG_NET_UDP_READAHEAD
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# include <nuttx/mm/iob.h>
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#endif
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#ifdef CONFIG_UDP_NOTIFIER
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# include <nuttx/wqueue.h>
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#endif
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#if defined(CONFIG_NET_UDP) && !defined(CONFIG_NET_UDP_NO_STACK)
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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#define NET_UDP_HAVE_STACK 1
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/* Conditions for support UDP poll/select operations */
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#ifdef CONFIG_NET_UDP_READAHEAD
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# define HAVE_UDP_POLL
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#endif
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#ifdef CONFIG_NET_UDP_WRITE_BUFFERS
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/* UDP write buffer dump macros */
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# ifdef CONFIG_DEBUG_FEATURES
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# define UDP_WBDUMP(msg,wrb,len,offset) \
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udp_wrbuffer_dump(msg,wrb,len,offset)
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# else
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# define UDP_WBDUMP(msg,wrb,len,offset)
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# endif
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#endif
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/* Allocate a new UDP data callback */
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#define udp_callback_alloc(dev,conn) \
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devif_callback_alloc((dev), &(conn)->list)
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#define udp_callback_free(dev,conn,cb) \
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devif_conn_callback_free((dev), (cb), &(conn)->list)
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/* Definitions for the UDP connection struct flag field */
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#define _UDP_FLAG_CONNECTMODE (1 << 0) /* Bit 0: UDP connection-mode */
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#define _UDP_ISCONNECTMODE(f) (((f) & _UDP_FLAG_CONNECTMODE) != 0)
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/****************************************************************************
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* Public Type Definitions
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****************************************************************************/
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/* Representation of a UDP connection */
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struct devif_callback_s; /* Forward reference */
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struct udp_hdr_s; /* Forward reference */
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struct udp_conn_s
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{
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/* Common prologue of all connection structures. */
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dq_entry_t node; /* Supports a doubly linked list */
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/* This is a list of UDP connection callbacks. Each callback represents
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* a thread that is stalled, waiting for a device-specific event.
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*/
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FAR struct devif_callback_s *list;
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/* UDP-specific content follows */
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union ip_binding_u u; /* IP address binding */
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uint16_t lport; /* Bound local port number (network byte order) */
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uint16_t rport; /* Remote port number (network byte order) */
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uint8_t flags; /* See _UDP_FLAG_* definitions */
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uint8_t domain; /* IP domain: PF_INET or PF_INET6 */
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uint8_t ttl; /* Default time-to-live */
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uint8_t crefs; /* Reference counts on this instance */
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#ifdef CONFIG_NET_UDP_BINDTODEVICE
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uint8_t boundto; /* Index of the interface we are bound to.
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* Unbound: 0, Bound: 1-MAX_IFINDEX */
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#endif
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#ifdef CONFIG_NET_UDP_READAHEAD
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/* Read-ahead buffering.
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*
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* readahead - A singly linked list of type struct iob_qentry_s
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* where the UDP/IP read-ahead data is retained.
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*/
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struct iob_queue_s readahead; /* Read-ahead buffering */
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#endif
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#ifdef CONFIG_NET_UDP_WRITE_BUFFERS
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/* Write buffering
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*
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* write_q - The queue of unsent I/O buffers. The head of this
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* list may be partially sent. FIFO ordering.
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*/
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sq_queue_t write_q; /* Write buffering for UDP packets */
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FAR struct net_driver_s *dev; /* Last device */
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#endif
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};
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/* This structure supports UDP write buffering. It is simply a container
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* for a IOB list and associated destination address.
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*/
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#ifdef CONFIG_NET_UDP_WRITE_BUFFERS
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struct udp_wrbuffer_s
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{
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sq_entry_t wb_node; /* Supports a singly linked list */
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struct sockaddr_storage wb_dest; /* Destination address */
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#ifdef CONFIG_NET_SOCKOPTS
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clock_t wb_start; /* Start time for timeout calculation */
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#endif
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struct iob_s *wb_iob; /* Head of the I/O buffer chain */
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};
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#endif
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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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/****************************************************************************
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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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struct net_driver_s; /* Forward reference */
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struct pollfd; /* Forward reference */
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/****************************************************************************
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* Name: udp_initialize
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*
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* Description:
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* Initialize the UDP connection structures. Called once and only from
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* the UIP layer.
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*
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****************************************************************************/
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void udp_initialize(void);
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/****************************************************************************
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* Name: udp_alloc
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*
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* Description:
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* Allocate a new, uninitialized UDP 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 udp_conn_s *udp_alloc(uint8_t domain);
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/****************************************************************************
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* Name: udp_free
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*
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* Description:
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* Free a UDP connection structure that is no longer in use. This should be
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* done by the implementation of close().
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*
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****************************************************************************/
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void udp_free(FAR struct udp_conn_s *conn);
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/****************************************************************************
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* Name: udp_active
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*
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* Description:
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* Find a connection structure that is the appropriate
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* connection to be used within the provided UDP/IP header
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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 udp_conn_s *udp_active(FAR struct net_driver_s *dev,
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FAR struct udp_hdr_s *udp);
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/****************************************************************************
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* Name: udp_nextconn
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*
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* Description:
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* Traverse the list of allocated UDP 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 udp_conn_s *udp_nextconn(FAR struct udp_conn_s *conn);
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/****************************************************************************
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* Name: udp_bind
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*
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* Description:
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* This function implements the low-level parts of the standard UDP bind()
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* operation.
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*
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* Assumptions:
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* This function is called from normal user level code.
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*
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****************************************************************************/
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int udp_bind(FAR struct udp_conn_s *conn, FAR const struct sockaddr *addr);
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/****************************************************************************
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* Name: udp_connect
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*
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* Description:
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* This function simply assigns a remote address to UDP "connection"
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* structure. This function is called as part of the implementation of:
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*
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* - connect(). If connect() is called for a SOCK_DGRAM socket, then
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* this logic performs the moral equivalent of connect() operation
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* for the UDP socket.
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* - recvfrom() and sendto(). This function is called to set the
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* remote address of the peer.
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*
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* The function will automatically allocate an unused local port for the
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* new connection if the socket is not yet bound to a local address.
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* However, another port can be chosen by using the udp_bind() call,
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* after the udp_connect() function has been called.
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*
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* Input Parameters:
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* conn - A reference to UDP connection structure. A value of NULL will
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* disconnect from any previously connected address.
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* addr - The address of the remote host.
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*
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* Assumptions:
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* This function is called (indirectly) from user code. Interrupts may
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* be enabled.
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*
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****************************************************************************/
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int udp_connect(FAR struct udp_conn_s *conn, FAR const struct sockaddr *addr);
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/****************************************************************************
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* Name: udp_ipv4_select
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*
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* Description:
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* Configure to send or receive an UDP IPv4 packet
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*
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****************************************************************************/
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#ifdef CONFIG_NET_IPv4
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void udp_ipv4_select(FAR struct net_driver_s *dev);
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#endif
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/****************************************************************************
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* Name: udp_ipv6_select
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*
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* Description:
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* Configure to send or receive an UDP IPv6 packet
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*
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****************************************************************************/
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#ifdef CONFIG_NET_IPv6
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void udp_ipv6_select(FAR struct net_driver_s *dev);
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#endif
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/****************************************************************************
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* Name: udp_poll
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*
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* Description:
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* Poll a UDP "connection" structure for availability of TX data
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*
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* Input Parameters:
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* dev - The device driver structure to use in the send operation
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* conn - The UDP "connection" to poll for TX data
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*
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* Returned Value:
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* None
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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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void udp_poll(FAR struct net_driver_s *dev, FAR struct udp_conn_s *conn);
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/****************************************************************************
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* Name: psock_udp_cansend
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*
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* Description:
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* psock_udp_cansend() returns a value indicating if a write to the socket
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* would block. It is still possible that the write may block if another
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* write occurs first.
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*
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* Input Parameters:
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* psock An instance of the internal socket structure.
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*
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* Returned Value:
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* -ENOSYS (Function not implemented, always have to wait to send).
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*
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* Assumptions:
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* None
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*
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****************************************************************************/
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int psock_udp_cansend(FAR struct socket *psock);
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/****************************************************************************
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* Name: udp_send
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*
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* Description:
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* Set-up to send a UDP packet
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*
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* Input Parameters:
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* dev - The device driver structure to use in the send operation
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* conn - The UDP "connection" structure holding port information
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*
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* Returned Value:
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* None
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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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void udp_send(FAR struct net_driver_s *dev, FAR struct udp_conn_s *conn);
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/****************************************************************************
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* Name: udp_setsockopt
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*
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* Description:
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* udp_setsockopt() sets the UDP-protocol option specified by the
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* 'option' argument to the value pointed to by the 'value' argument for
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* the socket specified by the 'psock' argument.
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*
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* See <netinet/udp.h> for the a complete list of values of UDP protocol
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* options.
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*
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* Input Parameters:
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* psock Socket structure of socket to operate on
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* option identifies the option to set
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* value Points to the argument value
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* value_len The length of the argument value
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*
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* Returned Value:
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* Returns zero (OK) on success. On failure, it returns a negated errno
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* value to indicate the nature of the error. See psock_setcockopt() for
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* the list of possible error values.
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*
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****************************************************************************/
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#ifdef CONFIG_NET_UDPPROTO_OPTIONS
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int udp_setsockopt(FAR struct socket *psock, int option,
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FAR const void *value, socklen_t value_len);
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#endif
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/****************************************************************************
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* Name: udp_wrbuffer_initialize
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*
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* Description:
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* Initialize the list of free write buffers
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*
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* Assumptions:
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* Called once early initialization.
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*
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****************************************************************************/
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#ifdef CONFIG_NET_UDP_WRITE_BUFFERS
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void udp_wrbuffer_initialize(void);
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#endif /* CONFIG_NET_UDP_WRITE_BUFFERS */
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/****************************************************************************
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* Name: udp_wrbuffer_alloc
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*
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* Description:
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* Allocate a UDP write buffer by taking a pre-allocated buffer from
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* the free list. This function is called from UDP logic when a buffer
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* of UDP data is about to sent
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*
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* Input Parameters:
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* None
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*
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* Assumptions:
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* Called from user logic with the network locked.
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*
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****************************************************************************/
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#ifdef CONFIG_NET_UDP_WRITE_BUFFERS
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struct udp_wrbuffer_s;
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FAR struct udp_wrbuffer_s *udp_wrbuffer_alloc(void);
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#endif /* CONFIG_NET_UDP_WRITE_BUFFERS */
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/****************************************************************************
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* Name: udp_wrbuffer_release
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*
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* Description:
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* Release a UDP write buffer by returning the buffer to the free list.
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* This function is called from user logic after it is consumed the
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* buffered data.
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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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#ifdef CONFIG_NET_UDP_WRITE_BUFFERS
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void udp_wrbuffer_release(FAR struct udp_wrbuffer_s *wrb);
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#endif /* CONFIG_NET_UDP_WRITE_BUFFERS */
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/****************************************************************************
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* Name: udp_wrbuffer_test
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*
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* Description:
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* Check if there is room in the write buffer. Does not reserve any space.
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*
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* Assumptions:
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* None.
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*
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****************************************************************************/
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#ifdef CONFIG_NET_UDP_WRITE_BUFFERS
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int udp_wrbuffer_test(void);
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#endif /* CONFIG_NET_UDP_WRITE_BUFFERS */
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/****************************************************************************
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* Name: udp_wrbuffer_dump
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*
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* Description:
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* Dump the contents of a write buffer.
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*
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****************************************************************************/
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#ifdef CONFIG_NET_UDP_WRITE_BUFFERS
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#ifdef CONFIG_DEBUG_FEATURES
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void udp_wrbuffer_dump(FAR const char *msg, FAR struct udp_wrbuffer_s *wrb,
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unsigned int len, unsigned int offset);
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#else
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# define udp_wrbuffer_dump(msg,wrb)
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#endif
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#endif /* CONFIG_NET_UDP_WRITE_BUFFERS */
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/****************************************************************************
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* Name: udp_ipv4_input
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*
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* Description:
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* Handle incoming UDP input in an IPv4 packet
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*
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* Input Parameters:
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* dev - The device driver structure containing the received UDP packet
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*
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* Returned Value:
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* OK The packet has been processed and can be deleted
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* ERROR Hold the packet and try again later. There is a listening socket
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* but no receive in place to catch the packet yet.
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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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#ifdef CONFIG_NET_IPv4
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int udp_ipv4_input(FAR struct net_driver_s *dev);
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#endif
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/****************************************************************************
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* Name: udp_ipv6_input
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*
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* Description:
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* Handle incoming UDP input in an IPv6 packet
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*
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* Input Parameters:
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* dev - The device driver structure containing the received UDP packet
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* iplen - The size of the IPv6 header. This may be larger than
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* IPv6_HDRLEN the IPv6 header if IPv6 extension headers are
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* present.
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*
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* Returned Value:
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* OK The packet has been processed and can be deleted
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* ERROR Hold the packet and try again later. There is a listening socket
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* but no receive in place to catch the packet yet.
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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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#ifdef CONFIG_NET_IPv6
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int udp_ipv6_input(FAR struct net_driver_s *dev, unsigned int iplen);
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#endif
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/****************************************************************************
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* Name: udp_find_laddr_device
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*
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* Description:
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* Select the network driver to use with the UDP transaction using the
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* locally bound IP address.
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*
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* Input Parameters:
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* conn - UDP connection structure (not currently used).
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*
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* Returned Value:
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* A pointer to the network driver to use. NULL is returned if driver is
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* not bound to any local device.
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*
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****************************************************************************/
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FAR struct net_driver_s *udp_find_laddr_device(FAR struct udp_conn_s *conn);
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|
/****************************************************************************
|
|
* Name: udp_find_raddr_device
|
|
*
|
|
* Description:
|
|
* Select the network driver to use with the UDP transaction using the
|
|
* remote IP address.
|
|
*
|
|
* Input Parameters:
|
|
* conn - UDP connection structure (not currently used).
|
|
*
|
|
* Returned Value:
|
|
* A pointer to the network driver to use.
|
|
*
|
|
****************************************************************************/
|
|
|
|
FAR struct net_driver_s *udp_find_raddr_device(FAR struct udp_conn_s *conn);
|
|
|
|
/****************************************************************************
|
|
* Name: udp_callback
|
|
*
|
|
* Description:
|
|
* Inform the application holding the UDP socket of a change in state.
|
|
*
|
|
* Returned Value:
|
|
* OK if packet has been processed, otherwise ERROR.
|
|
*
|
|
* Assumptions:
|
|
* Called from network stack logic with the network stack locked
|
|
*
|
|
****************************************************************************/
|
|
|
|
uint16_t udp_callback(FAR struct net_driver_s *dev,
|
|
FAR struct udp_conn_s *conn, uint16_t flags);
|
|
|
|
/****************************************************************************
|
|
* Name: psock_udp_send
|
|
*
|
|
* Description:
|
|
* Implements send() for connected UDP sockets
|
|
*
|
|
****************************************************************************/
|
|
|
|
ssize_t psock_udp_send(FAR struct socket *psock, FAR const void *buf,
|
|
size_t len);
|
|
|
|
/****************************************************************************
|
|
* Name: psock_udp_sendto
|
|
*
|
|
* Description:
|
|
* This function implements the UDP-specific logic of the standard
|
|
* sendto() socket operation.
|
|
*
|
|
* Input Parameters:
|
|
* psock A pointer to a NuttX-specific, internal socket structure
|
|
* buf Data to send
|
|
* len Length of data to send
|
|
* flags Send flags
|
|
* to Address of recipient
|
|
* tolen The length of the address structure
|
|
*
|
|
* NOTE: All input parameters were verified by sendto() before this
|
|
* function was called.
|
|
*
|
|
* Returned Value:
|
|
* On success, returns the number of characters sent. On error,
|
|
* a negated errno value is returned. See the description in
|
|
* net/socket/sendto.c for the list of appropriate return value.
|
|
*
|
|
****************************************************************************/
|
|
|
|
ssize_t psock_udp_sendto(FAR struct socket *psock, FAR const void *buf,
|
|
size_t len, int flags, FAR const struct sockaddr *to,
|
|
socklen_t tolen);
|
|
|
|
/****************************************************************************
|
|
* Name: udp_pollsetup
|
|
*
|
|
* Description:
|
|
* Setup to monitor events on one UDP/IP socket
|
|
*
|
|
* Input Parameters:
|
|
* psock - The UDP/IP 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_UDP_POLL
|
|
int udp_pollsetup(FAR struct socket *psock, FAR struct pollfd *fds);
|
|
#endif
|
|
|
|
/****************************************************************************
|
|
* Name: udp_pollteardown
|
|
*
|
|
* Description:
|
|
* Teardown monitoring of events on an UDP/IP socket
|
|
*
|
|
* Input Parameters:
|
|
* psock - The UDP/IP 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_UDP_POLL
|
|
int udp_pollteardown(FAR struct socket *psock, FAR struct pollfd *fds);
|
|
#endif
|
|
|
|
/****************************************************************************
|
|
* Name: udp_readahead_notifier_setup
|
|
*
|
|
* Description:
|
|
* Set up to perform a callback to the worker function when an UDP data
|
|
* is added to the read-ahead buffer. The worker function will execute
|
|
* on the low priority worker thread.
|
|
*
|
|
* Input Parameters:
|
|
* worker - The worker function to execute on the low priority work
|
|
* queue when data is available in the UDP read-ahead buffer.
|
|
* conn - The UDP connection where read-ahead data is needed.
|
|
* arg - A user-defined argument that will be available to the worker
|
|
* function when it runs.
|
|
*
|
|
* Returned Value:
|
|
* > 0 - The notification is in place. The returned value is a key that
|
|
* may be used later in a call to udp_notifier_teardown().
|
|
* == 0 - There is already buffered read-ahead data. No notification
|
|
* will be provided.
|
|
* < 0 - An unexpected error occurred and no notification will occur.
|
|
* The returned value is a negated errno value that indicates the
|
|
* nature of the failure.
|
|
*
|
|
****************************************************************************/
|
|
|
|
#ifdef CONFIG_UDP_NOTIFIER
|
|
int udp_readahead_notifier_setup(worker_t worker,
|
|
FAR struct udp_conn_s *conn,
|
|
FAR void *arg);
|
|
#endif
|
|
|
|
/****************************************************************************
|
|
* Name: udp_writebuffer_notifier_setup
|
|
*
|
|
* Description:
|
|
* Set up to perform a callback to the worker function when an UDP write
|
|
* buffer is emptied. The worker function will execute on the high
|
|
* priority worker thread.
|
|
*
|
|
* Input Parameters:
|
|
* worker - The worker function to execute on the low priority work
|
|
* queue when data is available in the UDP read-ahead buffer.
|
|
* conn - The UDP connection where read-ahead data is needed.
|
|
* arg - A user-defined argument that will be available to the worker
|
|
* function when it runs.
|
|
*
|
|
* Returned Value:
|
|
* > 0 - The notification is in place. The returned value is a key that
|
|
* may be used later in a call to udp_notifier_teardown().
|
|
* == 0 - There is already buffered read-ahead data. No notification
|
|
* will be provided.
|
|
* < 0 - An unexpected error occurred and no notification will occur.
|
|
* The returned value is a negated errno value that indicates the
|
|
* nature of the failure.
|
|
*
|
|
****************************************************************************/
|
|
|
|
#ifdef CONFIG_UDP_NOTIFIER
|
|
int udp_writebuffer_notifier_setup(worker_t worker,
|
|
FAR struct udp_conn_s *conn,
|
|
FAR void *arg);
|
|
#endif
|
|
|
|
/****************************************************************************
|
|
* Name: udp_notifier_teardown
|
|
*
|
|
* Description:
|
|
* Eliminate a UDP read-ahead notification previously setup by
|
|
* udp_readahead_notifier_setup(). This function should only be called if the
|
|
* notification should be aborted prior to the notification. The
|
|
* notification will automatically be torn down after the notification.
|
|
*
|
|
* Input Parameters:
|
|
* key - The key value returned from a previous call to
|
|
* udp_readahead_notifier_setup().
|
|
*
|
|
* Returned Value:
|
|
* Zero (OK) is returned on success; a negated errno value is returned on
|
|
* any failure.
|
|
*
|
|
****************************************************************************/
|
|
|
|
#ifdef CONFIG_UDP_NOTIFIER
|
|
int udp_notifier_teardown(int key);
|
|
#endif
|
|
|
|
/****************************************************************************
|
|
* Name: udp_readahead_signal
|
|
*
|
|
* Description:
|
|
* Read-ahead data has been buffered. Notify all threads waiting for
|
|
* read-ahead data to become available.
|
|
*
|
|
* When read-ahead data becomes available, *all* of the workers waiting
|
|
* for read-ahead data will be executed. If there are multiple workers
|
|
* waiting for read-ahead data then only the first to execute will get the
|
|
* data. Others will need to call udp_readahead_notifier_setup() once again.
|
|
*
|
|
* Input Parameters:
|
|
* conn - The UDP connection where read-ahead data was just buffered.
|
|
*
|
|
* Returned Value:
|
|
* None.
|
|
*
|
|
****************************************************************************/
|
|
|
|
#if defined(CONFIG_NET_UDP_READAHEAD) && defined(CONFIG_UDP_NOTIFIER)
|
|
void udp_readahead_signal(FAR struct udp_conn_s *conn);
|
|
#endif
|
|
|
|
/****************************************************************************
|
|
* Name: udp_writebuffer_signal
|
|
*
|
|
* Description:
|
|
* All buffer Tx data has been sent. Signal all threads waiting for the
|
|
* write buffers to become empty.
|
|
*
|
|
* When write buffer becomes empty, *all* of the workers waiting
|
|
* for that event data will be executed. If there are multiple workers
|
|
* waiting for read-ahead data then only the first to execute will get the
|
|
* data. Others will need to call tcp_writebuffer_notifier_setup() once
|
|
* again.
|
|
*
|
|
* Input Parameters:
|
|
* conn - The UDP connection where read-ahead data was just buffered.
|
|
*
|
|
* Returned Value:
|
|
* None.
|
|
*
|
|
****************************************************************************/
|
|
|
|
#if defined(CONFIG_NET_UDP_WRITE_BUFFERS) && defined(CONFIG_UDP_NOTIFIER)
|
|
void udp_writebuffer_signal(FAR struct udp_conn_s *conn);
|
|
#endif
|
|
|
|
/****************************************************************************
|
|
* Name: udp_txdrain
|
|
*
|
|
* Description:
|
|
* Wait for all write buffers to be sent (or for a timeout to occur).
|
|
*
|
|
* Input Parameters:
|
|
* psock - An instance of the internal socket structure.
|
|
* abstime - The absolute time when the timeout will occur
|
|
*
|
|
* Returned Value:
|
|
* Zero (OK) is returned on success; a negated errno value is returned
|
|
* on any failure.
|
|
*
|
|
****************************************************************************/
|
|
|
|
#if defined(CONFIG_NET_UDP_WRITE_BUFFERS) && defined(CONFIG_UDP_NOTIFIER)
|
|
struct timespec;
|
|
int udp_txdrain(FAR struct socket *psock,
|
|
FAR const struct timespec *abstime);
|
|
#else
|
|
# define udp_txdrain(conn, abstime) (0)
|
|
#endif
|
|
|
|
#undef EXTERN
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
|
|
#endif /* CONFIG_NET_UDP && !CONFIG_NET_UDP_NO_STACK */
|
|
#endif /* __NET_UDP_UDP_H */
|