Fixes for AF_UNIX support on OS/2:
- return the full size of the sockaddr_un structure, without which
bind() fails with EINVAL;
- set test_socketserver to use a socket name that meets the form
required by the underlying implementation;
- don't bother exercising the forking AF_UNIX tests on EMX - its
fork() can't handle the stress.
OS/2's TCP/IP stack supports AF_UNIX sockets, with the limitation that
the socket name must start with /socket32/. Unlike Unix systems, this
file never exists in the file system.
I don't think the fix here is very good, but I'm not sure what would
be better. In particular, we should not be defining _SGIAPI, but lots
of things break if we remove it.
(Contributed by Bob Halley)
Added a new exception, socket.timeout so that timeouts can be differentiated
from other socket exceptions.
Docs, more tests, and newsitem to follow.
- The socket module now provides the functions inet_pton and inet_ntop
for converting between string and packed representation of IP addresses.
See SF patch #658327.
This still needs a bit of work in the doc area, because it is not
available on all platforms (especially not on Windows).
Rather than trying to second-guess the various error returns
of a second connect(), use select() to determine whether the
socket becomes writable (which means connected).
