add AF_UNIX notes
diff --git a/PC/os2emx/README.os2emx b/PC/os2emx/README.os2emx
index 4238382..ffc5181 100644
--- a/PC/os2emx/README.os2emx
+++ b/PC/os2emx/README.os2emx
@@ -641,6 +641,14 @@
The emulation was written to support a link() based file locking system
used in GNU Mailman.
+26. AF_UNIX sockets, otherwise known as Unix domain sockets, are now
+supported. Unfortunately, there are some traps arising from the
+implementation in IBM's TCP/IP stack:-
+- the path name must start with '\\socket\\' ('/socket/' won't work!),
+ with the length of the full path name less than 108 characters;
+- unlike Unix, the socket endpoints don't exist in the filesystem;
+- by default, sockets are in binary mode.
+
... probably other issues that I've not encountered, or don't remember :-(
If you encounter other difficulties with this port, which can be
@@ -680,4 +688,4 @@
E-mail: andymac@bullseye.apana.org.au, or andymac@pcug.org.au
Web: http://www.andymac.org/
-2 December, 2003.
+11 April, 2004.