IO::Socket->recv() method documentation?

BrowserUk has asked for the wisdom of the Perl Monks concerning the following question:

Where is the return value of the recv() method documented?

I'm aware of this from the recv pod:

Returns the address of the sender if SOCKET's protocol supports this; returns an empty string otherwise. If there's an error, returns the undefined value.

But what does it mean by "address"? And which protocals support it; and which not?

Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.

"Science is about questioning the status quo. Questioning authority".

In the absence of evidence, opinion is indistinguishable from prejudice.

Comment on IO::Socket->recv() method documentation?

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Re: IO::Socket->recv() method documentation? by cdarke (Prior) on Apr 07, 2011 at 11:29 UTC
The address will be in sockaddr_in format, similar to that passed to bind. See the examples in Sockets: Client/Server Communication in perlipc.	[reply]
Re^2: IO::Socket->recv() method documentation? by BrowserUk (Patriarch) on Apr 07, 2011 at 18:37 UTC
The address will be in sockaddr_in format, Is that a scalar, an array, a hash or some kind of object? similar to that passed to bind. What is bind? As an IO::Socket user, I've never had to bind anything. See the examples in Sockets: Client/Server Communication in perlipc. There aren't any IO::Socket udp examples in perlipc. And what code is in there seems to be written in some foreign language? Like C with dollars. Half of the examples don't compile with strict even though someone has stuck a big my block of horribly named variables at the top. If the modernists want something to do to make Perl look more modern, that would be a better starting place than trying to convert the world to the OOne trOO way :) Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error. "Science is about questioning the status quo. Questioning authority". In the absence of evidence, opinion is indistinguishable from prejudice.	[reply]
Re^3: IO::Socket->recv() method documentation? by ikegami (Patriarch) on Apr 07, 2011 at 19:34 UTC
Is that a scalar, an array, a hash or some kind of object? A packed string/structure. Socket and thus IO::Socket provides tools. `use Socket qw( sockaddr_in inet_ntoa ); my ($port, $packed_addr) = sockaddr_in($peer); my $addr = inet_ntoa($packed_addr);` [download] This answer is specific to IPv4. What is bind? As an IO::Socket user, I've never had to bind anything. You'd know it as `LocalPort`.	[reply] [d/l] [select]
Re^4: IO::Socket->recv() method documentation? by BrowserUk (Patriarch) on Apr 07, 2011 at 20:35 UTC
Re^5: IO::Socket->recv() method documentation? by ikegami (Patriarch) on Apr 07, 2011 at 20:58 UTC
Re^2: IO::Socket->recv() method documentation? by Illuminatus (Curate) on Apr 07, 2011 at 13:26 UTC
cdarke's response does pre-suppose that you are using ipv4 sockets. I have never tried it with a UNIX-domain socket, so I don't know if it would return the path to the fifo, or nothing. An ipv6 socket would return sockaddr_in6. I have no idea what a TIPC socket would return. fnord	[reply]


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