001/* SocketOptions.java -- Implements options for sockets (duh!) 002 Copyright (C) 1998, 1999, 2000, 2001, 003 2002, 2003 Free Software Foundation, Inc. 004 005This file is part of GNU Classpath. 006 007GNU Classpath is free software; you can redistribute it and/or modify 008it under the terms of the GNU General Public License as published by 009the Free Software Foundation; either version 2, or (at your option) 010any later version. 011 012GNU Classpath is distributed in the hope that it will be useful, but 013WITHOUT ANY WARRANTY; without even the implied warranty of 014MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 015General Public License for more details. 016 017You should have received a copy of the GNU General Public License 018along with GNU Classpath; see the file COPYING. If not, write to the 019Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02002110-1301 USA. 021 022Linking this library statically or dynamically with other modules is 023making a combined work based on this library. Thus, the terms and 024conditions of the GNU General Public License cover the whole 025combination. 026 027As a special exception, the copyright holders of this library give you 028permission to link this library with independent modules to produce an 029executable, regardless of the license terms of these independent 030modules, and to copy and distribute the resulting executable under 031terms of your choice, provided that you also meet, for each linked 032independent module, the terms and conditions of the license of that 033module. An independent module is a module which is not derived from 034or based on this library. If you modify this library, you may extend 035this exception to your version of the library, but you are not 036obligated to do so. If you do not wish to do so, delete this 037exception statement from your version. */ 038 039package java.net; 040 041 042/** 043 * Written using on-line Java Platform 1.2 API Specification. 044 * Status: Believed complete and correct. 045 */ 046/** 047 * This interface is used by <code>SocketImpl</code> and 048 * <code>DatagramSocketImpl</code> to implement options 049 * on sockets. 050 * 051 * @since 1.2 052 * 053 * @author Aaron M. Renn (arenn@urbanophile.com) 054 * @author Warren Levy (warrenl@cygnus.com) 055 * @status should be completely JDK 1.4 compatible 056 */ 057public interface SocketOptions 058{ 059 /** 060 * Option id for the SO_KEEPALIVE value 061 * @since 1.3 062 */ 063 int SO_KEEPALIVE = 0x8; 064 065 /** 066 * Option id for the SO_LINGER value 067 */ 068 int SO_LINGER = 0x80; // 128 069 070 /** 071 * Option id for the SO_TIMEOUT value 072 */ 073 int SO_TIMEOUT = 0x1006; // 4102 074 075 /** 076 * Retrieve the local address to which the socket is bound. 077 */ 078 int SO_BINDADDR = 0x0F; // 15 079 080 /** 081 * Option id for the send buffer size 082 * @since 1.2 083 */ 084 int SO_SNDBUF = 0x1001; // 4097 085 086 /** 087 * Option id for the receive buffer size 088 * @since 1.2 089 */ 090 int SO_RCVBUF = 0x1002; // 4098 091 092 /** 093 * Sets the SO_REUSEADDR parameter on a socket 094 */ 095 int SO_REUSEADDR = 0x04; // 4 096 097 /** 098 * Sets SO_BROADCAST for a socket 099 * @since 1.4 100 */ 101 int SO_BROADCAST = 0x20; // 32 102 103 /** 104 * Sets SO_OOBINLINE for a socket 105 * @since 1.4 106 */ 107 int SO_OOBINLINE = 0x1003; // 4099 108 109 /** 110 * Option id for the TCP_NODELAY value 111 */ 112 int TCP_NODELAY = 0x01; // 1 113 114 /** 115 * Options id for the IP_MULTICAST_IF value 116 */ 117 int IP_MULTICAST_IF = 0x10; // 16 118 119 /** 120 * same as above 121 * @since 1.4 122 */ 123 int IP_MULTICAST_IF2 = 0x1F; // 31 124 125 /** 126 * This option enables or disables local loopback of multicast datagrams. 127 * @since 1.4 128 */ 129 int IP_MULTICAST_LOOP = 0x12; // 18 130 131 /** 132 * This option sets the type-of-service or traffic class field in the 133 * IP header for a TCP or UDP socket. 134 * @since 1.4 135 */ 136 int IP_TOS = 0x03; // 3 137 138 /** 139 * Sets the specified option on a socket to the passed in object. For 140 * options that take an integer argument, the passed in object is an 141 * <code>Integer</code>. For options that are set to on or off, the 142 * value passed will be a <code>Boolean</code>. The <code>optionId</code> 143 * parameter is one of the defined constants in this interface. 144 * 145 * @param optionId The identifier of the option 146 * @param val The value to set the option to 147 * 148 * @exception SocketException If an error occurs 149 */ 150 void setOption(int optionId, Object val) throws SocketException; 151 152 /** 153 * Returns the current setting of the specified option. The 154 * <code>Object</code> returned will be an <code>Integer</code> for options 155 * that have integer values. For options that are set to on or off, a 156 * <code>Boolean</code> will be returned. The <code>optionId</code> 157 * parameter is one of the defined constants in this interface. 158 * 159 * @param optionId The option identifier 160 * 161 * @return The current value of the option 162 * 163 * @exception SocketException If an error occurs 164 */ 165 Object getOption(int optionId) throws SocketException; 166} // interface SocketOptions