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Index | Description | Usage | Options | Variables | Hints | Bulletproof
Advanced
Programming in Expect:
A Bulletproof Interface
Moving Window Diagnostics
Expect provides a means of
controlling the output of its internal diagnostics and expression-matching
attempts using the command "exp_internal".
The send_expect
interface makes use of this command to create a diagnostics output file
for each transmission attempt - for each attempt, a new diagnostics log
file is created using exp_internal -f. If transmission is successful,
the file is deleted. If it fails, the file is renamed using the syntax
send.n.i.command.diags
where
n = the number of
the failure
i = the spawn id of the
channel that had the failure
command = the first word
of the command string that failed to get sent properly.
If you've ever read a 30 Megabyte
log file with all of the diagnostics from the beginning to the end of execution,
you'll understand why this is necessary. The diagnostics files created
using this method are usually less that 2 Kilobytes, and since they are
directly associated with failures (because the window file is deleted for
successful transmissions), debugging is far more efficient. At the end of execution,
there should be at least as many diagnostic files as there were transmission errors;
more if certain global flags are set.
Ideally, if there are no
failures during execution, there should be no more than one send diagnostics
file in existence at any time, named send.diagnostics. If there are
diagnostics files, each is associated with a particular failure and should
be used in debugging that failure.
Prev
Next
Introduction
Setting
Up The Interface
Using
The send_expect Procedure
How
It Works
Moving
Window Snapshot Diagnostics
Controlling
The Behavior Of The Interface
Failures
© 1999,
dlf,www.cotse.com
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