(I am using AS 5.8.0)

AF_UNIX is not implemented for win32 (or let me be more careful, at least this win98 I am using).

You cannot really see the fact clearly with IO::Socket::UNIX. If you open up the IO/Socket/UNIX.pm, you will see that, too many times, that module simply returns undef without any indication of the type of failure.

But with this piece of code, you could get more specific indication:

use Socket;

socket(SOCKET, AF_UNIX, SOCK_STREAM, getprotobyname("tcp"));
unlink("pool");
$pool = sockaddr_un("pool"); #fail, get error message "Socket::pack_so
+ckaddr_un not implemented on this architecture", "un" stands for "uni
+x", compare with sockaddr_in ("in" stands for "inet") 
connect(SOCKET, $pool);
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