Tomcat example source code file (Socket.java)
The Tomcat Socket.java source code/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.tomcat.jni;
/* Import needed classes */
import java.nio.ByteBuffer;
/** Socket
*
* @author Mladen Turk
* @version $Revision: 467222 $, $Date: 2006-10-24 05:17:11 +0200 (mar., 24 oct. 2006) $
*/
public class Socket {
/* Standard socket defines */
public static final int SOCK_STREAM = 0;
public static final int SOCK_DGRAM = 1;
/*
* apr_sockopt Socket option definitions
*/
public static final int APR_SO_LINGER = 1; /** Linger */
public static final int APR_SO_KEEPALIVE = 2; /** Keepalive */
public static final int APR_SO_DEBUG = 4; /** Debug */
public static final int APR_SO_NONBLOCK = 8; /** Non-blocking IO */
public static final int APR_SO_REUSEADDR = 16; /** Reuse addresses */
public static final int APR_SO_SNDBUF = 64; /** Send buffer */
public static final int APR_SO_RCVBUF = 128; /** Receive buffer */
public static final int APR_SO_DISCONNECTED = 256; /** Disconnected */
/** For SCTP sockets, this is mapped to STCP_NODELAY internally. */
public static final int APR_TCP_NODELAY = 512;
public static final int APR_TCP_NOPUSH = 1024; /** No push */
/** This flag is ONLY set internally when we set APR_TCP_NOPUSH with
* APR_TCP_NODELAY set to tell us that APR_TCP_NODELAY should be turned on
* again when NOPUSH is turned off
*/
public static final int APR_RESET_NODELAY = 2048;
/** Set on non-blocking sockets (timeout != 0) on which the
* previous read() did not fill a buffer completely. the next
* apr_socket_recv() will first call select()/poll() rather than
* going straight into read(). (Can also be set by an application to
* force a select()/poll() call before the next read, in cases where
* the app expects that an immediate read would fail.)
*/
public static final int APR_INCOMPLETE_READ = 4096;
/** like APR_INCOMPLETE_READ, but for write
*/
public static final int APR_INCOMPLETE_WRITE = 8192;
/** Don't accept IPv4 connections on an IPv6 listening socket.
*/
public static final int APR_IPV6_V6ONLY = 16384;
/** Delay accepting of new connections until data is available.
*/
public static final int APR_TCP_DEFER_ACCEPT = 32768;
/** Define what type of socket shutdown should occur.
* apr_shutdown_how_e enum
*/
public static final int APR_SHUTDOWN_READ = 0; /** no longer allow read request */
public static final int APR_SHUTDOWN_WRITE = 1; /** no longer allow write requests */
public static final int APR_SHUTDOWN_READWRITE = 2; /** no longer allow read or write requests */
public static final int APR_IPV4_ADDR_OK = 0x01;
public static final int APR_IPV6_ADDR_OK = 0x02;
/* TODO: Missing:
* APR_INET
* APR_UNSPEC
* APR_INET6
*/
public static final int APR_UNSPEC = 0;
public static final int APR_INET = 1;
public static final int APR_INET6 = 2;
public static final int APR_PROTO_TCP = 6; /** TCP */
public static final int APR_PROTO_UDP = 17; /** UDP */
public static final int APR_PROTO_SCTP = 132; /** SCTP */
/**
* Enum to tell us if we're interested in remote or local socket
* apr_interface_e
*/
public static final int APR_LOCAL = 0;
public static final int APR_REMOTE = 1;
/* Socket.get types */
public static final int SOCKET_GET_POOL = 0;
public static final int SOCKET_GET_IMPL = 1;
public static final int SOCKET_GET_APRS = 2;
public static final int SOCKET_GET_TYPE = 3;
/**
* Create a socket.
* @param family The address family of the socket (e.g., APR_INET).
* @param type The type of the socket (e.g., SOCK_STREAM).
* @param protocol The protocol of the socket (e.g., APR_PROTO_TCP).
* @param cont The parent pool to use
* @return The new socket that has been set up.
*/
public static native long create(int family, int type,
int protocol, long cont)
throws Exception;
/**
* Shutdown either reading, writing, or both sides of a socket.
* <br />
* This does not actually close the socket descriptor, it just
* controls which calls are still valid on the 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>
*/
public static native int shutdown(long thesocket, int how);
/**
* Close a socket.
* @param thesocket The socket to close
*/
public static native int close(long thesocket);
/**
* Destroy a pool associated with socket
* @param thesocket The destroy
*/
public static native void destroy(long thesocket);
/**
* Bind the socket to its associated port
* @param sock The socket to bind
* @param sa The socket address to bind to
* This may be where we will find out if there is any other process
* using the selected port.
*/
public static native int bind(long sock, long 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.
*/
public static native int listen(long sock, int backlog);
/**
* Accept a new connection request
* @param sock The socket we are listening on.
* @param pool The pool for the new socket.
* @return 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.
*/
public static native long accept(long sock)
throws Exception;
/**
* Set an OS level accept filter.
* @param sock The socket to put the accept filter on.
* @param name The accept filter
* @param args Any extra args to the accept filter. Passing NULL here removes
* the accept filter.
*/
public static native int acceptfilter(long sock, String name, String args);
/**
* Query the specified socket if at the OOB/Urgent data mark
* @param sock The socket to query
* @return True if socket is at the OOB/urgent mark,
* otherwise return false.
*/
public static native boolean atmark(long sock);
/**
* 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.
*/
public static native int connect(long sock, long sa);
/**
* Send data over a network.
* <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>
* @param sock The socket to send the data over.
* @param buf The buffer which contains the data to be sent.
* @param offset Offset in the byte buffer.
* @param len The number of bytes to write; (-1) for full array.
* @return The number of bytes send.
*
*/
public static native int send(long sock, byte[] buf, int offset, int len);
/**
* Send data over a network.
* <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>
* @param sock The socket to send the data over.
* @param buf The Byte buffer which contains the data to be sent.
* @param offset The offset within the buffer array of the first buffer from
* which bytes are to be retrieved; must be non-negative
* and no larger than buf.length
* @param len The maximum number of buffers to be accessed; must be non-negative
* and no larger than buf.length - offset
* @return The number of bytes send.
*
*/
public static native int sendb(long sock, ByteBuffer buf,
int offset, int len);
/**
* Send data over a network using internally set ByteBuffer
*/
public static native int sendbb(long sock,
int offset, int len);
/**
* Send multiple packets of data over a network.
* <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>
* @param sock The socket to send the data over.
* @param vec The array from which to get the data to send.
*
*/
public static native int sendv(long sock, byte[][] vec);
/**
* @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 offset Offset in the byte buffer.
* @param len The length of the data to send
*/
public static native int sendto(long sock, long where, int flags,
byte[] buf, int offset, int len);
/**
* Read data from a network.
*
* <PRE>
* This functions acts like a blocking read by default. To change
* this behavior, use apr_socket_timeout_set() or the APR_SO_NONBLOCK
* socket option.
* The number of bytes actually received is stored in argument 3.
*
* It is possible for both bytes to be received and an APR_EOF or
* other error to be returned.
*
* APR_EINTR is never returned.
* </PRE>
* @param sock The socket to read the data from.
* @param buf The buffer to store the data in.
* @param offset Offset in the byte buffer.
* @param nbytes The number of bytes to read (-1) for full array.
* @return the number of bytes received.
*/
public static native int recv(long sock, byte[] buf, int offset, int nbytes);
/**
* Read data from a network with timeout.
*
* <PRE>
* This functions acts like a blocking read by default. To change
* this behavior, use apr_socket_timeout_set() or the APR_SO_NONBLOCK
* socket option.
* The number of bytes actually received is stored in argument 3.
*
* It is possible for both bytes to be received and an APR_EOF or
* other error to be returned.
*
* APR_EINTR is never returned.
* </PRE>
* @param sock The socket to read the data from.
* @param buf The buffer to store the data in.
* @param offset Offset in the byte buffer.
* @param nbytes The number of bytes to read (-1) for full array.
* @param timeout The socket timeout in microseconds.
* @return the number of bytes received.
*/
public static native int recvt(long sock, byte[] buf, int offset,
int nbytes, long timeout);
/**
* Read data from a network.
*
* <PRE>
* This functions acts like a blocking read by default. To change
* this behavior, use apr_socket_timeout_set() or the APR_SO_NONBLOCK
* socket option.
* The number of bytes actually received is stored in argument 3.
*
* It is possible for both bytes to be received and an APR_EOF or
* other error to be returned.
*
* APR_EINTR is never returned.
* </PRE>
* @param sock The socket to read the data from.
* @param buf The buffer to store the data in.
* @param offset Offset in the byte buffer.
* @param nbytes The number of bytes to read (-1) for full array.
* @return the number of bytes received.
*/
public static native int recvb(long sock, ByteBuffer buf,
int offset, int nbytes);
/**
* Read data from a network using internally set ByteBuffer
*/
public static native int recvbb(long sock,
int offset, int nbytes);
/**
* Read data from a network with timeout.
*
* <PRE>
* This functions acts like a blocking read by default. To change
* this behavior, use apr_socket_timeout_set() or the APR_SO_NONBLOCK
* socket option.
* The number of bytes actually received is stored in argument 3.
*
* It is possible for both bytes to be received and an APR_EOF or
* other error to be returned.
*
* APR_EINTR is never returned.
* </PRE>
* @param sock The socket to read the data from.
* @param buf The buffer to store the data in.
* @param offset Offset in the byte buffer.
* @param nbytes The number of bytes to read (-1) for full array.
* @param timeout The socket timeout in microseconds.
* @return the number of bytes received.
*/
public static native int recvbt(long sock, ByteBuffer buf,
int offset, int nbytes, long timeout);
/**
* Read data from a network with timeout using internally set ByteBuffer
*/
public static native int recvbbt(long sock,
int offset, int nbytes, long timeout);
/**
* @param from The apr_sockaddr_t to fill in the recipient info
* @param sock The socket to use
* @param flags The flags to use
* @param buf The buffer to use
* @param offset Offset in the byte buffer.
* @param nbytes The number of bytes to read (-1) for full array.
* @return the number of bytes received.
*/
public static native int recvFrom(long from, long sock, int flags,
byte[] buf, int offset, int nbytes);
/**
* Setup socket options for the specified socket
* @param sock The socket to set up.
* @param opt The option we would like to configure. One of:
* <PRE>
* APR_SO_DEBUG -- turn on debugging information
* APR_SO_KEEPALIVE -- keep connections active
* APR_SO_LINGER -- lingers on close if data is present
* APR_SO_NONBLOCK -- Turns blocking on/off for socket
* When this option is enabled, use
* the APR_STATUS_IS_EAGAIN() macro to
* see if a send or receive function
* could not transfer data without
* blocking.
* APR_SO_REUSEADDR -- The rules used in validating addresses
* supplied to bind should allow reuse
* of local addresses.
* APR_SO_SNDBUF -- Set the SendBufferSize
* APR_SO_RCVBUF -- Set the ReceiveBufferSize
* </PRE>
* @param on Value for the option.
*/
public static native int optSet(long sock, int opt, int on);
/**
* Query socket options for the specified socket
* @param sock The socket to query
* @param opt The option we would like to query. One of:
* <PRE>
* APR_SO_DEBUG -- turn on debugging information
* APR_SO_KEEPALIVE -- keep connections active
* APR_SO_LINGER -- lingers on close if data is present
* APR_SO_NONBLOCK -- Turns blocking on/off for socket
* APR_SO_REUSEADDR -- The rules used in validating addresses
* supplied to bind should allow reuse
* of local addresses.
* APR_SO_SNDBUF -- Set the SendBufferSize
* APR_SO_RCVBUF -- Set the ReceiveBufferSize
* APR_SO_DISCONNECTED -- Query the disconnected state of the socket.
* (Currently only used on Windows)
* </PRE>
* @return Socket option returned on the call.
*/
public static native int optGet(long sock, int opt)
throws Exception;
/**
* Setup socket timeout for the specified socket
* @param sock The socket to set up.
* @param t Value for the timeout in microseconds.
* <PRE>
* t > 0 -- read and write calls return APR_TIMEUP if specified time
* elapsess with no data read or written
* t == 0 -- read and write calls never block
* t < 0 -- read and write calls block
* </PRE>
*/
public static native int timeoutSet(long sock, long t);
/**
* Query socket timeout for the specified socket
* @param sock The socket to query
* @return Socket timeout returned from the query.
*/
public static native long timeoutGet(long sock)
throws Exception;
/**
* Send a file from an open file descriptor to a socket, along with
* optional headers and trailers.
* <br />
* 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.
* @param sock The socket to which we're writing
* @param file The open file from which to read
* @param headers Array containing the headers to send
* @param trailers Array containing the trailers to send
* @param offset Offset into the file where we should begin writing
* @param len Number of bytes to send from the file
* @param flags APR flags that are mapped to OS specific flags
* @return Number of bytes actually sent, including headers,
* file, and trailers
*
*/
public static native long sendfile(long sock, long file, byte [][] headers,
byte[][] trailers, long offset,
long len, int flags);
/**
* Send a file without header and trailer arrays.
*/
public static native long sendfilen(long sock, long file, long offset,
long len, int flags);
/**
* Create a child pool from associated socket pool.
* @param thesocket The socket to use
*/
public static native long pool(long thesocket)
throws Exception;
/**
* Private method for geting the socket struct members
* @param socket The soocket to use
* @param what Struct member to obtain
* <PRE>
* SOCKET_GET_POOL - The socket pool
* SOCKET_GET_IMPL - The socket implementation object
* SOCKET_GET_APRS - APR socket
* SOCKET_GET_TYPE - Socket type
* </PRE>
* @return The stucture member address
*/
private static native long get(long socket, int what);
/**
* Set internal send ByteBuffer.
* This function will preset internal Java ByteBuffer for
* consecutive sendbb calls.
* @param thesocket The socket to use
* @param buf The ByteBuffer
*/
public static native void setsbb(long sock, ByteBuffer buf);
/**
* Set internal receive ByteBuffer.
* This function will preset internal Java ByteBuffer for
* consecutive revcvbb/recvbbt calls.
* @param thesocket The socket to use
* @param buf The ByteBuffer
*/
public static native void setrbb(long sock, ByteBuffer buf);
}
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