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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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socket-event(8) 					      System Manager's Manual						   socket-event(8)

NAME
socket - event signalling that a socket connection has been made SYNOPSIS
socket PROTO=PROTO PORT=PORT ADDR=ADDR socket PROTO=PROTO PATH=PATH DESCRIPTION
The socket event is generated by the upstart-socket-bridge(8) daemon when a socket connection is made whose details match the socket event condition and environment specified in a jobs start on or stop on stanza. When an incoming connection is detected, the file descriptor representing the socket is passed to the job in question to allow it to accept(2) the connection. Additionally, the environment variable UPSTART_JOB will contain the name of the event ("socket") and the environ- ment variable UPSTART_FDS will contain the number of the file descriptor corresponding to the listening socket. EXAMPLES
Internet socket Start web server when first client connects from localhost: start on socket PROTO=inet PORT=80 ADDR=127.0.0.1 Local socket start on socket PROTO=unix PATH=/var/run/.s.pgsql.1234 Abstract socket start on socket PROTO=unix PATH=@/at/upstart/example AUTHOR
Written by Scott James Remnant <scott@netsplit.com> Manual page written by James Hunt <james.hunt@ubuntu.com> BUGS
Report bugs at <https://launchpad.net/upstart/+bugs> COPYRIGHT
Copyright (C) 2011 Canonical Ltd. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICU- LAR PURPOSE. SEE ALSO
init(5) init(8) socket(2) socket(7) upstart-socket-bridge(8) upstart 2011-03-08 socket-event(8)
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