Re: Tcl script fails on some platforms

At Tue, 31 Jul 2007 10:19:06 -0700 hrp1000@xxxxxxxxx wrote:


Okay, I think I've got at least a partial answer to this problem.

The interface between my Tcl script and the Fortran/C program is via
TCP/IP sockets. If I force the IP address of the server side (in Tcl)
to be localhost or 127.0.0.1, I get this error and can see that
$::session has not been set (or is set to somethiing that doesn't
print on the screen).

If I just let the Tcl socket stuff use the real IP address of the
machine, I don't get the problem.

Now I have to see if my user (in a different time zone) can tell me
more about his machine...

Sounds like it is machine that lacks an EtherNet connection...

If the Fortran/C program is in fact running on the local machine, then
the interface code needs to be able to work over the loopback device
(localhost or 127.0.0.1) -- in fact it should prefer to use the
loopback, since that is more secure -- it avoids running a 'public'
service that could be hacked into.

You might want to have a really close look at the code where the sockets
are set up and see why using the loopback device causes problems.




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