text: /**
   * \file net.h
   *
   *  Based on XySSL: Copyright (C) 2006-2008  Christophe Devine
   *
   *  Copyright (C) 2009  Paul Bakker <polarssl_maintainer at polarssl dot org>
   *
   *  All rights reserved.
   *
   *  Redistribution and use in source and binary forms, with or without
   *  modification, are permitted provided that the following conditions
   *  are met:
   *
   *    * Redistributions of source code must retain the above copyright
   *      notice, this list of conditions and the following disclaimer.
   *    * 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.
   *    * Neither the names of PolarSSL or XySSL 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 TROPICSSL_NET_H
  #define TROPICSSL_NET_H
  
  #define TROPICSSL_ERR_NET_UNKNOWN_HOST                      -0x0F00
  #define TROPICSSL_ERR_NET_SOCKET_FAILED                     -0x0F10
  #define TROPICSSL_ERR_NET_CONNECT_FAILED                    -0x0F20
  #define TROPICSSL_ERR_NET_BIND_FAILED                       -0x0F30
  #define TROPICSSL_ERR_NET_LISTEN_FAILED                     -0x0F40
  #define TROPICSSL_ERR_NET_ACCEPT_FAILED                     -0x0F50
  #define TROPICSSL_ERR_NET_RECV_FAILED                       -0x0F60
  #define TROPICSSL_ERR_NET_SEND_FAILED                       -0x0F70
  #define TROPICSSL_ERR_NET_CONN_RESET                        -0x0F80
  #define TROPICSSL_ERR_NET_TRY_AGAIN                         -0x0F90
  
  #ifdef __cplusplus
  extern "C" {
  #endif
  
  	/**
  	 * \brief          Initiate a TCP connection with host:port
  	 *
  	 * \return         0 if successful, or one of:
  	 *                      TROPICSSL_ERR_NET_SOCKET_FAILED,
  	 *                      TROPICSSL_ERR_NET_UNKNOWN_HOST,
  	 *                      TROPICSSL_ERR_NET_CONNECT_FAILED
  	 */
  	int net_connect(int *fd, char *host, int port);
  
  	/**
  	 * \brief          Create a listening socket on bind_ip:port.
  	 *                 If bind_ip == NULL, all interfaces are binded.
  	 *
  	 * \return         0 if successful, or one of:
  	 *                      TROPICSSL_ERR_NET_SOCKET_FAILED,
  	 *                      TROPICSSL_ERR_NET_BIND_FAILED,
  	 *                      TROPICSSL_ERR_NET_LISTEN_FAILED
  	 */
  	int net_bind(int *fd, char *bind_ip, int port);
  
  	/**
  	 * \brief          Accept a connection from a remote client
  	 *
  	 * \return         0 if successful, TROPICSSL_ERR_NET_ACCEPT_FAILED, or
  	 *                 TROPICSSL_ERR_NET_WOULD_BLOCK is bind_fd was set to
  	 *                 non-blocking and accept() is blocking.
  	 */
  	int net_accept(int bind_fd, int *client_fd, void *client_ip);
  
  	/**
  	 * \brief          Set the socket blocking
  	 *
  	 * \return         0 if successful, or a non-zero error code
  	 */
  	int net_set_block(int fd);
  
  	/**
  	 * \brief          Set the socket non-blocking
  	 *
  	 * \return         0 if successful, or a non-zero error code
  	 */
  	int net_set_nonblock(int fd);
  
  	/**
  	 * \brief          Portable usleep helper
  	 *
  	 * \note           Real amount of time slept will not be less than
  	 *                 select()'s timeout granularity (typically, 10ms).
  	 */
  	void net_usleep(unsigned long usec);
  
  	/**
  	 * \brief          Read at most 'len' characters. len is updated to
  	 *                 reflect the actual number of characters read.
  	 *
  	 * \return         This function returns the number of bytes received,
  	 *                 or a negative error code; TROPICSSL_ERR_NET_TRY_AGAIN
  	 *                 indicates read() is blocking.
  	 */
  	int net_recv(void *ctx, unsigned char *buf, int len);
  
  	/**
  	 * \brief          Write at most 'len' characters. len is updated to
  	 *                 reflect the number of characters _not_ written.
  	 *
  	 * \return         This function returns the number of bytes sent,
  	 *                 or a negative error code; TROPICSSL_ERR_NET_TRY_AGAIN
  	 *                 indicates write() is blocking.
  	 */
  	int net_send(void *ctx, unsigned char *buf, int len);
  
  	/**
  	 * \brief          Gracefully shutdown the connection
  	 */
  	void net_close(int fd);
  
  #ifdef __cplusplus
  }
  #endif
  #endif				/* net.h */
  