https://tomcat.apache.org/: Interface code to the native connector 
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package org.apache.tomcat.jni;


Multicast

Author:Mladen Turk
/** Multicast
 *
 * @author Mladen Turk
 */
public class Multicast {

    
Join a Multicast Group

Params:
  • sock – The socket to join a multicast group
  • join – The address of the multicast group to join
  • iface – Address of the interface to use.  If NULL is passed, the
             default multicast interface will be used. (OS Dependent)
  • source – Source Address to accept transmissions from (non-NULL
              implies Source-Specific Multicast)
Returns:the operation status
/**
     * Join a Multicast Group
     * @param sock The socket to join a multicast group
     * @param join The address of the multicast group to join
     * @param iface Address of the interface to use.  If NULL is passed, the
     *              default multicast interface will be used. (OS Dependent)
     * @param source Source Address to accept transmissions from (non-NULL
     *               implies Source-Specific Multicast)
     * @return the operation status
     */
    public static native int join(long sock, long join,
                                  long iface, long source);

    
Leave a Multicast Group.  All arguments must be the same as
apr_mcast_join.

Params:
  • sock – The socket to leave a multicast group
  • addr – The address of the multicast group to leave
  • iface – Address of the interface to use.  If NULL is passed, the
             default multicast interface will be used. (OS Dependent)
  • source – Source Address to accept transmissions from (non-NULL
              implies Source-Specific Multicast)
Returns:the operation status
/**
     * Leave a Multicast Group.  All arguments must be the same as
     * apr_mcast_join.
     * @param sock The socket to leave a multicast group
     * @param addr The address of the multicast group to leave
     * @param iface Address of the interface to use.  If NULL is passed, the
     *              default multicast interface will be used. (OS Dependent)
     * @param source Source Address to accept transmissions from (non-NULL
     *               implies Source-Specific Multicast)
     * @return the operation status
     */
    public static native int leave(long sock, long addr,
                                   long iface, long source);

    
Set the Multicast Time to Live (ttl) for a multicast transmission.

Params:
  • sock – The socket to set the multicast ttl
  • ttl – Time to live to Assign. 0-255, default=1

    Remark : If the TTL is 0, packets will only be seen
by sockets on the local machine,
and only when multicast loopback is enabled.
Returns:the operation status
/**
     * Set the Multicast Time to Live (ttl) for a multicast transmission.
     * @param sock The socket to set the multicast ttl
     * @param ttl Time to live to Assign. 0-255, default=1
     * <br><b>Remark :</b> If the TTL is 0, packets will only be seen
     * by sockets on the local machine,
     * and only when multicast loopback is enabled.
     * @return the operation status
     */
    public static native int hops(long sock, int ttl);

    
Toggle IP Multicast Loopback

Params:
  • sock – The socket to set multicast loopback
  • opt – false=disable, true=enable
Returns:the operation status
/**
     * Toggle IP Multicast Loopback
     * @param sock The socket to set multicast loopback
     * @param opt false=disable, true=enable
     * @return the operation status
     */
    public static native int loopback(long sock, boolean opt);


    
Set the Interface to be used for outgoing Multicast Transmissions.

Params:
  • sock – The socket to set the multicast interface on
  • iface – Address of the interface to use for Multicast
Returns:the operation status
/**
     * Set the Interface to be used for outgoing Multicast Transmissions.
     * @param sock The socket to set the multicast interface on
     * @param iface Address of the interface to use for Multicast
     * @return the operation status
     */
    public static native int ointerface(long sock, long iface);

}