Hi Chris,
Actually come to think of it, I'm not sure if the DNS thread safety problem is in 10.3. I know it was in 10.1 and 10.2, and is not in 10.4. Can you have a look at the man page for gethostbyname and see if it says anything about thread safety, possibly under "BUGS"?
Here is the text you asked about: BUGS These functions use static data storage; if the data is needed for future use, it should be copied before any subsequent calls overwrite it. Only the Internet address format is currently understood.
If necessary, this limitation can also be worked around for 10.3 by adding a wrapper around all DNS calls that uses a mutex to ensure that only one call to the underlying functions is made at a time.
That is what I expected. Thanks for the confirmation. ron