IP Multicast

Functions
apr_status_t	apr_mcast_join (apr_socket_t *sock, apr_sockaddr_t *join, apr_sockaddr_t *iface, apr_sockaddr_t *source)
apr_status_t	apr_mcast_leave (apr_socket_t *sock, apr_sockaddr_t *addr, apr_sockaddr_t *iface, apr_sockaddr_t *source)
apr_status_t	apr_mcast_hops (apr_socket_t *sock, apr_byte_t ttl)
apr_status_t	apr_mcast_loopback (apr_socket_t *sock, apr_byte_t opt)
apr_status_t	apr_mcast_interface (apr_socket_t *sock, apr_sockaddr_t *iface)

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Function Documentation

apr_status_t apr_mcast_hops	(	apr_socket_t *	sock,
		apr_byte_t	ttl
	)

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

Parameters:

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

Remarks:

If the TTL is 0, packets will only be seen by sockets on the local machine, and only when multicast loopback is enabled.

apr_status_t apr_mcast_interface	(	apr_socket_t *	sock,
		apr_sockaddr_t *	iface
	)

Set the Interface to be used for outgoing Multicast Transmissions.

Parameters:

sock	The socket to set the multicast interface on
iface	Address of the interface to use for Multicast

apr_status_t apr_mcast_join	(	apr_socket_t *	sock,
		apr_sockaddr_t *	join,
		apr_sockaddr_t *	iface,
		apr_sockaddr_t *	source
	)

Join a Multicast Group

Parameters:

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)

apr_status_t apr_mcast_leave	(	apr_socket_t *	sock,
		apr_sockaddr_t *	addr,
		apr_sockaddr_t *	iface,
		apr_sockaddr_t *	source
	)

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

Parameters:

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)

apr_status_t apr_mcast_loopback	(	apr_socket_t *	sock,
		apr_byte_t	opt
	)

Toggle IP Multicast Loopback

Parameters:

sock	The socket to set multicast loopback
opt	0=disable, 1=enable