net.h

it is know of https implement source code

/**
 * \file net.h
 */
#ifndef XYSSL_NET_H
#define XYSSL_NET_H

#define XYSSL_ERR_NET_UNKNOWN_HOST                      -0x0F00
#define XYSSL_ERR_NET_SOCKET_FAILED                     -0x0F10
#define XYSSL_ERR_NET_CONNECT_FAILED                    -0x0F20
#define XYSSL_ERR_NET_BIND_FAILED                       -0x0F30
#define XYSSL_ERR_NET_LISTEN_FAILED                     -0x0F40
#define XYSSL_ERR_NET_ACCEPT_FAILED                     -0x0F50
#define XYSSL_ERR_NET_RECV_FAILED                       -0x0F60
#define XYSSL_ERR_NET_SEND_FAILED                       -0x0F70
#define XYSSL_ERR_NET_CONN_RESET                        -0x0F80
#define XYSSL_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:
 *                      XYSSL_ERR_NET_SOCKET_FAILED,
 *                      XYSSL_ERR_NET_UNKNOWN_HOST,
 *                      XYSSL_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:
 *                      XYSSL_ERR_NET_SOCKET_FAILED,
 *                      XYSSL_ERR_NET_BIND_FAILED,
 *                      XYSSL_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, XYSSL_ERR_NET_ACCEPT_FAILED, or
 *                 XYSSL_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; XYSSL_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; XYSSL_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 */