IO::Socket::UNIX recvmsg error

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

I'm trying to create a IO::Socket::UNIX socket for receiving data from a netflow collector that can only write to files. I've created a small socket script (see below) that seems to run ok, but I get the following error when I run the collector:

...
client_open_log: entering
answer_open_log: entering
answer_open_log: open: Operation not supported
receive_fd: recvmsg: expected received 1 got 0#
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And the script:

#!/usr/bin/perl

use strict;
use IO::Socket;

use constant SOCK_PATH => '/tmp/flowpipe.sock';

$SIG{TERM} = $SIG{INT} = sub { exit 0 };

my $path = shift || SOCK_PATH;
umask(0111);
my $sock = IO::Socket::UNIX->new(Local => SOCK_PATH, Listen => SOMAXCO
+NN);

while (1) {
    my $data;
    my $peer = recv($sock, $data, 128, 0);
    print $data;
}

END { unlink $path if $path }
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Any ideas what this error means or how to correct it?

Thanks,

Update: Corrected options passed to new().

Another Update: According to djm, flowd will not work with sockets at all. He's been able to provide patches to support FIFO properly, so this has been resolved.

-fp

Comment on IO::Socket::UNIX recvmsg error Select or Download Code

Replies are listed 'Best First'.
Re: IO::Socket::UNIX recvmsg error by Fletch (Bishop) on May 16, 2005 at 02:16 UTC
I think you want a named pipe (see `man mknod`), not a UNIX domain socket. It still may have problems (for example, your writer may try and `seek` on the descriptor), but I think you're barking up the wrong tree with a UNIX domain socket.	[reply]
Re^2: IO::Socket::UNIX recvmsg error by fuzzyping (Chaplain) on May 16, 2005 at 02:21 UTC
Yes, the writer does indeed try to seek on the descriptor. I gave up trying to use fifo/pipes for just this reason. -fp	[reply]
Re^3: IO::Socket::UNIX recvmsg error by mattk (Pilgrim) on May 16, 2005 at 05:53 UTC
In this case, FIFOs would actually be more appropriate than sockets. Sockets are analogous to TCP or UDP connections (which is no coincidence), whereas FIFOs are closer to "ordinary" file operations. But since you've already been down that road, you'll have to look elsewhere. Have you considered processing lines from the file as they arrive, tail -f style?	[reply]
Re^4: IO::Socket::UNIX recvmsg error by fuzzyping (Chaplain) on May 16, 2005 at 10:19 UTC
Re: IO::Socket::UNIX recvmsg error by thcsoft (Monk) on May 16, 2005 at 01:44 UTC
i once had similar problems with AF_UNIX sockets, which is why i've been only using TCP sockets since. what happens, when you enable warnings? language is a virus from outer space.	[reply]
Re^2: IO::Socket::UNIX recvmsg error by fuzzyping (Chaplain) on May 16, 2005 at 01:50 UTC
Unfortunately, netflow connectors generally only write to file. Their purpose is to read in a UDP netflow packet and log the data to disk. I'm trying to write a script which will read in from the collector's output and allow me to store to database. Warnings isn't giving me any additional information. -fp	[reply]