apr_network_io.h

Apache官方在今天放出产品系列2.2的最新版本2.2.11的源码包 最流行的HTTP服务器软件之一

APR_DECLARE(apr_status_t) apr_socket_create(apr_socket_t **new_sock, 
                                            int family, int type,
                                            int protocol,
                                            apr_pool_t *cont);

/**
 * Shutdown either reading, writing, or both sides of a socket.
 * @param thesocket The socket to close 
 * @param how How to shutdown the socket.  One of:
 * <PRE>
 *            APR_SHUTDOWN_READ         no longer allow read requests
 *            APR_SHUTDOWN_WRITE        no longer allow write requests
 *            APR_SHUTDOWN_READWRITE    no longer allow read or write requests 
 * </PRE>
 * @see apr_shutdown_how_e
 * @remark This does not actually close the socket descriptor, it just
 *      controls which calls are still valid on the socket.
 */
APR_DECLARE(apr_status_t) apr_socket_shutdown(apr_socket_t *thesocket,
                                              apr_shutdown_how_e how);

/**
 * Close a socket.
 * @param thesocket The socket to close 
 */
APR_DECLARE(apr_status_t) apr_socket_close(apr_socket_t *thesocket);

/**
 * Bind the socket to its associated port
 * @param sock The socket to bind 
 * @param sa The socket address to bind to
 * @remark This may be where we will find out if there is any other process
 *      using the selected port.
 */
APR_DECLARE(apr_status_t) apr_socket_bind(apr_socket_t *sock, 
                                          apr_sockaddr_t *sa);

/**
 * Listen to a bound socket for connections.
 * @param sock The socket to listen on 
 * @param backlog The number of outstanding connections allowed in the sockets
 *                listen queue.  If this value is less than zero, the listen
 *                queue size is set to zero.  
 */
APR_DECLARE(apr_status_t) apr_socket_listen(apr_socket_t *sock, 
                                            apr_int32_t backlog);

/**
 * Accept a new connection request
 * @param new_sock A copy of the socket that is connected to the socket that
 *                 made the connection request.  This is the socket which should
 *                 be used for all future communication.
 * @param sock The socket we are listening on.
 * @param connection_pool The pool for the new socket.
 */
APR_DECLARE(apr_status_t) apr_socket_accept(apr_socket_t **new_sock, 
                                            apr_socket_t *sock,
                                            apr_pool_t *connection_pool);

/**
 * Issue a connection request to a socket either on the same machine 
 * or a different one.
 * @param sock The socket we wish to use for our side of the connection 
 * @param sa The address of the machine we wish to connect to.
 */
APR_DECLARE(apr_status_t) apr_socket_connect(apr_socket_t *sock,
                                             apr_sockaddr_t *sa);

/**
 * Create apr_sockaddr_t from hostname, address family, and port.
 * @param sa The new apr_sockaddr_t.
 * @param hostname The hostname or numeric address string to resolve/parse, or
 *               NULL to build an address that corresponds to 0.0.0.0 or ::
 * @param family The address family to use, or APR_UNSPEC if the system should 
 *               decide.
 * @param port The port number.
 * @param flags Special processing flags:
 * <PRE>
 *       APR_IPV4_ADDR_OK          first query for IPv4 addresses; only look
 *                                 for IPv6 addresses if the first query failed;
 *                                 only valid if family is APR_UNSPEC and hostname
 *                                 isn't NULL; mutually exclusive with
 *                                 APR_IPV6_ADDR_OK
 *       APR_IPV6_ADDR_OK          first query for IPv6 addresses; only look
 *                                 for IPv4 addresses if the first query failed;
 *                                 only valid if family is APR_UNSPEC and hostname
 *                                 isn't NULL and APR_HAVE_IPV6; mutually exclusive
 *                                 with APR_IPV4_ADDR_OK
 * </PRE>
 * @param p The pool for the apr_sockaddr_t and associated storage.
 */
APR_DECLARE(apr_status_t) apr_sockaddr_info_get(apr_sockaddr_t **sa,
                                          const char *hostname,
                                          apr_int32_t family,
                                          apr_port_t port,
                                          apr_int32_t flags,
                                          apr_pool_t *p);

/**
 * Look up the host name from an apr_sockaddr_t.
 * @param hostname The hostname.
 * @param sa The apr_sockaddr_t.
 * @param flags Special processing flags.
 */
APR_DECLARE(apr_status_t) apr_getnameinfo(char **hostname,
                                          apr_sockaddr_t *sa,
                                          apr_int32_t flags);

/**
 * Parse hostname/IP address with scope id and port.
 *
 * Any of the following strings are accepted:
 *   8080                  (just the port number)
 *   www.apache.org        (just the hostname)
 *   www.apache.org:8080   (hostname and port number)
 *   [fe80::1]:80          (IPv6 numeric address string only)
 *   [fe80::1%eth0]        (IPv6 numeric address string and scope id)
 *
 * Invalid strings:
 *                         (empty string)
 *   [abc]                 (not valid IPv6 numeric address string)
 *   abc:65536             (invalid port number)
 *
 * @param addr The new buffer containing just the hostname.  On output, *addr 
 *             will be NULL if no hostname/IP address was specfied.
 * @param scope_id The new buffer containing just the scope id.  On output, 
 *                 *scope_id will be NULL if no scope id was specified.
 * @param port The port number.  On output, *port will be 0 if no port was 
 *             specified.
 *             ### FIXME: 0 is a legal port (per RFC 1700). this should
 *             ### return something besides zero if the port is missing.
 * @param str The input string to be parsed.
 * @param p The pool from which *addr and *scope_id are allocated.
 * @remark If scope id shouldn't be allowed, check for scope_id != NULL in 
 *         addition to checking the return code.  If addr/hostname should be 
 *         required, check for addr == NULL in addition to checking the 
 *         return code.
 */
APR_DECLARE(apr_status_t) apr_parse_addr_port(char **addr,
                                              char **scope_id,
                                              apr_port_t *port,
                                              const char *str,
                                              apr_pool_t *p);

/**
 * Get name of the current machine
 * @param buf A buffer to store the hostname in.
 * @param len The maximum length of the hostname that can be stored in the
 *            buffer provided.  The suggested length is APRMAXHOSTLEN + 1.
 * @param cont The pool to use.
 * @remark If the buffer was not large enough, an error will be returned.
 */
APR_DECLARE(apr_status_t) apr_gethostname(char *buf, int len, apr_pool_t *cont);

/**
 * Return the data associated with the current socket
 * @param data The user data associated with the socket.
 * @param key The key to associate with the user data.
 * @param sock The currently open socket.
 */
APR_DECLARE(apr_status_t) apr_socket_data_get(void **data, const char *key,
                                              apr_socket_t *sock);

/**
 * Set the data associated with the current socket.
 * @param sock The currently open socket.
 * @param data The user data to associate with the socket.
 * @param key The key to associate with the data.
 * @param cleanup The cleanup to call when the socket is destroyed.
 */
APR_DECLARE(apr_status_t) apr_socket_data_set(apr_socket_t *sock, void *data,
                                              const char *key,
                                              apr_status_t (*cleanup)(void*));

/**
 * Send data over a network.
 * @param sock The socket to send the data over.
 * @param buf The buffer which contains the data to be sent. 
 * @param len On entry, the number of bytes to send; on exit, the number
 *            of bytes sent.
 * @remark
 * <PRE>
 * This functions acts like a blocking write by default.  To change 
 * this behavior, use apr_socket_timeout_set() or the APR_SO_NONBLOCK
 * socket option.
 *
 * It is possible for both bytes to be sent and an error to be returned.
 *
 * APR_EINTR is never returned.
 * </PRE>
 */
APR_DECLARE(apr_status_t) apr_socket_send(apr_socket_t *sock, const char *buf, 
                                          apr_size_t *len);

/**
 * Send multiple packets of data over a network.
 * @param sock The socket to send the data over.
 * @param vec The array of iovec structs containing the data to send 
 * @param nvec The number of iovec structs in the array
 * @param len Receives the number of bytes actually written
 * @remark
 * <PRE>
 * This functions acts like a blocking write by default.  To change 
 * this behavior, use apr_socket_timeout_set() or the APR_SO_NONBLOCK
 * socket option.
 * The number of bytes actually sent is stored in argument 3.
 *
 * It is possible for both bytes to be sent and an error to be returned.
 *
 * APR_EINTR is never returned.
 * </PRE>
 */
APR_DECLARE(apr_status_t) apr_socket_sendv(apr_socket_t *sock, 
                                           const struct iovec *vec,
                                           apr_int32_t nvec, apr_size_t *len);

/**
 * @param sock The socket to send from
 * @param where The apr_sockaddr_t describing where to send the data
 * @param flags The flags to use
 * @param buf  The data to send
 * @param len  The length of the data to send
 */
APR_DECLARE(apr_status_t) apr_socket_sendto(apr_socket_t *sock, 
                                            apr_sockaddr_t *where,
                                            apr_int32_t flags, const char *buf, 
                                            apr_size_t *len);

/**
 * Read data from a socket.  On success, the address of the peer from
 * which the data was sent is copied into the @param from parameter,
 * and the @param len parameter is updated to give the number of bytes
 * written to @param buf.
 * @param from Updated with the address from which the data was received
 * @param sock The socket to use
 * @param flags The flags to use
 * @param buf  The buffer to use
 * @param len  The length of the available buffer
 */

APR_DECLARE(apr_status_t) apr_socket_recvfrom(apr_sockaddr_t *from, 
                                              apr_socket_t *sock,
                                              apr_int32_t flags, char *buf, 
                                              apr_size_t *len);
 
#if APR_HAS_SENDFILE || defined(DOXYGEN)

/**
 * Send a file from an open file descriptor to a socket, along with 
 * optional headers and trailers
 * @param sock The socket to which we're writing
 * @param file The open file from which to read
 * @param hdtr A structure containing the headers and trailers to send
 * @param offset Offset into the file where we should begin writing
 * @param len (input)  - Number of bytes to send from the file 
 *            (output) - Number of bytes actually sent, 
 *                       including headers, file, and trailers
 * @param flags APR flags that are mapped to OS specific flags
 * @remark This functions acts like a blocking write by default.  To change 
 *         this behavior, use apr_socket_timeout_set() or the
 *         APR_SO_NONBLOCK socket option.
 * The number of bytes actually sent is stored in the len parameter.
 * The offset parameter is passed by reference for no reason; its
 * value will never be modified by the apr_socket_sendfile() function.
 */
APR_DECLARE(apr_status_t) apr_socket_sendfile(apr_socket_t *sock, 
                                              apr_file_t *file,
                                              apr_hdtr_t *hdtr,
                                              apr_off_t *offset,
                                              apr_size_t *len,
                                              apr_int32_t flags);

#endif /* APR_HAS_SENDFILE */

/**
 * Read data from a network.
 * @param sock The socket to read the data from.
 * @param buf The buffer to store the data in. 
 * @param len On entry, the number of bytes to receive; on exit, the number
 *            of bytes received.
 * @remark