/**************************************************************************** * net/tcp/tcp.h * * Copyright (C) 2014 Gregory Nutt. All rights reserved. * Author: Gregory Nutt * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in * the documentation and/or other materials provided with the * distribution. * 3. Neither the name NuttX nor the names of its contributors may be * used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. * ****************************************************************************/ #ifndef _NET_TCP_TCP_H #define _NET_TCP_TCP_H /**************************************************************************** * Included Files ****************************************************************************/ #include #include #ifdef CONFIG_NET_TCP /**************************************************************************** * Pre-processor Definitions ****************************************************************************/ /**************************************************************************** * Public Type Definitions ****************************************************************************/ /**************************************************************************** * Public Data ****************************************************************************/ #ifdef __cplusplus # define EXTERN extern "C" extern "C" { #else # define EXTERN extern #endif /**************************************************************************** * Public Function Prototypes ****************************************************************************/ /**************************************************************************** * Function: tcp_send * * Description: * The tcp_send() call may be used only when the TCP socket is in a * connected state (so that the intended recipient is known). * * Parameters: * psock An instance of the internal socket structure. * buf Data to send * len Length of data to send * * Returned Value: * On success, returns the number of characters sent. On error, * -1 is returned, and errno is set appropriately: * * EAGAIN or EWOULDBLOCK * The socket is marked non-blocking and the requested operation * would block. * EBADF * An invalid descriptor was specified. * ECONNRESET * Connection reset by peer. * EDESTADDRREQ * The socket is not connection-mode, and no peer address is set. * EFAULT * An invalid user space address was specified for a parameter. * EINTR * A signal occurred before any data was transmitted. * EINVAL * Invalid argument passed. * EISCONN * The connection-mode socket was connected already but a recipient * was specified. (Now either this error is returned, or the recipient * specification is ignored.) * EMSGSIZE * The socket type requires that message be sent atomically, and the * size of the message to be sent made this impossible. * ENOBUFS * The output queue for a network interface was full. This generally * indicates that the interface has stopped sending, but may be * caused by transient congestion. * ENOMEM * No memory available. * ENOTCONN * The socket is not connected, and no target has been given. * ENOTSOCK * The argument s is not a socket. * EPIPE * The local end has been shut down on a connection oriented socket. * In this case the process will also receive a SIGPIPE unless * MSG_NOSIGNAL is set. * * Assumptions: * ****************************************************************************/ struct socket; ssize_t tcp_send(FAR struct socket *psock, FAR const void *buf, size_t len); /**************************************************************************** * Function: tcp_wrbuffer_initialize * * Description: * Initialize the list of free write buffers * * Assumptions: * Called once early initialization. * ****************************************************************************/ #ifdef CONFIG_NET_TCP_WRITE_BUFFERS void tcp_wrbuffer_initialize(void); #endif /* CONFIG_NET_TCP_WRITE_BUFFERS */ /**************************************************************************** * Function: tcp_wrbuffer_alloc * * Description: * Allocate a TCP write buffer by taking a pre-allocated buffer from * the free list. This function is called from TCP logic when a buffer * of TCP data is about to sent * * Assumptions: * Called from user logic with interrupts enabled. * ****************************************************************************/ #ifdef CONFIG_NET_TCP_WRITE_BUFFERS struct tcp_wrbuffer_s; FAR struct tcp_wrbuffer_s *tcp_wrbuffer_alloc(void); #endif /* CONFIG_NET_TCP_WRITE_BUFFERS */ /**************************************************************************** * Function: tcp_wrbuffer_release * * Description: * Release a TCP write buffer by returning the buffer to the free list. * This function is called from user logic after it is consumed the * buffered data. * * Assumptions: * Called from interrupt level with interrupts disabled. * ****************************************************************************/ #ifdef CONFIG_NET_TCP_WRITE_BUFFERS void tcp_wrbuffer_release(FAR struct tcp_wrbuffer_s *wrb); #endif /* CONFIG_NET_TCP_WRITE_BUFFERS */ /**************************************************************************** * Function: tcp_wrbuffer_dump * * Description: * Dump the contents of a write buffer. * ****************************************************************************/ #ifdef CONFIG_NET_TCP_WRITE_BUFFERS #ifdef CONFIG_DEBUG void tcp_wrbuffer_dump(FAR const char *msg, FAR struct tcp_wrbuffer_s *wrb, unsigned int len, unsigned int offset); #else # define tcp_wrbuffer_dump(msg,wrb) #endif #endif /* CONFIG_NET_TCP_WRITE_BUFFERS */ #undef EXTERN #ifdef __cplusplus } #endif #endif /* CONFIG_NET_TCP */ #endif /* _NET_TCP_TCP_H */