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Full Discussion: Clarification - Setting socket options at the same time when socket is listening
Special Forums IP Networking Clarification - Setting socket options at the same time when socket is listening Post 302515204 by jim mcnamara on Tuesday 19th of April 2011 11:25:45 AM
Old 04-19-2011
Quote:
EADDRINUSE Address already joined for
IP_ADD_MEMBERSHIP.

ENOENT Address not joined for IP_DROP_MEMBERSHIP.

EPERM No permissions.

EACCES Permission denied.
What you are working with in essence is a file descriptor, unless you are making a call to another protocol level. Since the socket has bind() already called on it you cannot change lower level protocol settings.

Just like with open files, some changes are okay, others not. I have no idea what you are trying to change, so try it, and see what error return you get, if any.

What are you trying to do? is the real question.
 

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LEARN ABOUT DEBIAN

socket::multicast6

Socket::Multicast6(3pm) 				User Contributed Perl Documentation				   Socket::Multicast6(3pm)

NAME

       Socket::Multicast6 - Constructors and constants for IPv4 and IPv6 multicast socket operations.

SYNOPSIS

	 use Socket::Multicast6 qw(:all);

	 my $ip = getprotobyname( 'ip' );

	 my $ip_mreq = pack_ip_mreq( inet_aton( $mcast_addr ), inet_aton( $if_addr ) );

	 my $ipv6_mreq = pack_ipv6_mreq( inet_pton( AF_INET6, $mcast6_addr ), $if_index );

	 setsockopt( $sock, $ip, IP_ADD_MEMBERSHIP, $ip_mreq )
	   or die( "setsockopt IP_ADD_MEMBERSHIP failed: $!" );

	 setsockopt( $sock, $ip, IP_DROP_MEMBERSHIP, $ip_mreq )
	   or die( "setsockopt IP_DROP_MEMBERSHIP failed: $!" );

	 setsockopt( $sock, $ip, IP_MULTICAST_LOOP, pack( 'C', $loop ) )
	   or die( "setsockopt IP_MULTICAST_LOOP failed: $!" );

	 setsockopt( $sock, $ip, IP_MULTICAST_TTL, pack( 'C', $ttl ) )
	   or die( "setsockopt IP_MULTICAST_TTL failed: $!" );

DESCRIPTION

       This module is used to gain access to constants and utility functions used when manipulating multicast socket attributes.

       For simple, object-oriented way of doing the same thing, take a look at IO::Socket::Multicast6 or IO::Socket::Multicast.

EXPORTS

       By default nothing is exported, you can use the 'ipv4', 'ipv6' and 'independent' to export a specific protocol family, or 'all' to export
       all symbols.

FUNCTIONS

       $ip_mreq = pack_ip_mreq(MCAST_ADDR, IF_ADDR)
       $ip_mreq_source = pack_ip_mreq_source(MCAST_ADDR, SOURCE_ADDR, IF_ADDR)
       $ipv6_mreq = pack_ipv6_mreq(MCAST6_ADDR, IF_INDEX)

CONSTANTS

       IP_MULTICAST_IF
       IP_MULTICAST_TTL
       IP_MULTICAST_LOOP
       IP_ADD_MEMBERSHIP
       IP_DROP_MEMBERSHIP
       IP_ADD_SOURCE_MEMBERSHIP
       IP_DROP_SOURCE_MEMBERSHIP
       IPV6_MULTICAST_IF
       IPV6_MULTICAST_HOPS
       IPV6_MULTICAST_LOOP
       IPV6_JOIN_GROUP
       IPV6_LEAVE_GROUP
       MCAST_JOIN_GROUP
       MCAST_BLOCK_SOURCE
       MCAST_UNBLOCK_SOURCE
       MCAST_LEAVE_GROUP
       MCAST_JOIN_SOURCE_GROUP
       MCAST_LEAVE_SOURCE_GROUP

SEE ALSO

       IO::Socket::Multicast6 (The easier, object-oriented way)

AUTHOR

       Based on Socket::Multicast by Jonathan Steinert, <hachi@cpan.org> Socket::Multicast6 by Nicholas J Humfrey, <njh@cpan.org>

COPYRIGHT AND LICENSE

       Copyright (C) 2006 Nicholas J Humfrey Copyright (C) 2006 Jonathan Steinert

       This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself, either Perl version 5.6.1 or,
       at your option, any later version of Perl 5 you may have available.

perl v5.14.2							    2011-11-15						   Socket::Multicast6(3pm)
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