Curt> How do I time out the reads when I do this? When I connect to,
Curt> say, an SMTP server, the three way handshake may complete, but I
Curt> may not get a 220 from the server within a reasonable amount of
Curt> time. At that point I have to time out and mark the service as
Curt> down.
In pure Tcl, you would schedule an `after' event. Once you get a
response, you will simple cancel the `after' event. Otherwise, the
`after' event will fire up and you close the connection.
So you basically start a timer, which is IMHO the straight-forward
implementaiton of the underlying model. Anyway, using expect as Doug
suggest might make this even easier.
Curt> Again, I'd like to be able to deal with programs that can
Curt> potentially wedge themselves and never return, or take too long
Curt> to produce output.
See above. It does not matter whether the Tcl channel belongs to a
pipe or a TCP connection.
Curt> Also, how do I `widow' the ouput pipe to the program? That is,
Curt> how do I close it whilst still leaving the input pipe open so I
Curt> can send it an end of file and read any remaining output?
I am not sure if you can do this in plain Tcl.
Juergen
Juergen Schoenwaelder schoenw@ibr.cs.tu-bs.de http://www.cs.tu-bs.de/~schoenw
Technical University Braunschweig, Dept. Operating Systems & Computer Networks
Bueltenweg 74/75, 38106 Braunschweig, Germany. (Tel. +49 531 / 391 3283)
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