bug#5723: 23.1.94; make-network-process and emacs hangs

[Leo]

The source code of make-network-process (around line 3648 in process.c)
seems to suggest that this function is blocking and my experience can
confirm the case.

When there's no network connection, make-network-process returns in a
short duration. Where it become nasty is in a network where certain
ports are blocked, for example, in my uni's wireless network, the irc
port is blocked and if I accidentally run M-x irc then emacs hangs for
hours.

Could this be improved i.e. by wrapping it in with-local-quit?

Thanks.


In GNU Emacs 23.1.94.1 (x86_64-apple-darwin10.2.0, Carbon Version 1.6.0 AppKit 
1038.25)
 of 2010-03-14 on Victoria.local
Windowing system distributor `Apple Inc.', version 10.6.2
configured using `configure  '--prefix=/usr/local/unix/emacs' '--with-mac' 
'CFLAGS=''

Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: nil
  value of $LC_CTYPE: nil
  value of $LC_MESSAGES: nil
  value of $LC_MONETARY: nil
  value of $LC_NUMERIC: nil
  value of $LC_TIME: nil
  value of $LANG: nil
  value of $XMODIFIERS: nil
  locale-coding-system: iso-latin-1-unix
  default enable-multibyte-characters: t