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Index | Description | Usage | Options | Variables | Hints | Bulletproof
Advanced
Programming in Expect:
A Bulletproof Interface
How It Works:
The interface uses four different
transmission modes, in order:
1) send the entire string and
hope for the best (fastest, but least reliable)
2) send the entire string using
the send_slow
list
3) send the string in blocks
of eight characters
4) send the string one character
at a time (slowest, but most reliable)
If a mode fails, the command
line is cleared by sending the standard control-U, the expect buffer is
cleared, and the next mode is tried. Each mode except the last one
can also have a failure tolerance set, using:
sendGlobals(ModeXFailMax),
where X is either 1,2 or 3.
If this max value is set to
a positive number, once the failures for that mode exceeds this value,
it is no longer used. If it is set to 0, then each mode is tried
for each transmission, regardless of the number of failures. Each
of the modes uses the send_only
procedure as a wrapper for exp_send.
If this procedure returns an error, it most likely means that the connection
was lost, and the spawn id is checked to see if the session is still active.
The error is returned to send_expect,
which in turn returns an error to the calling procedure.
For local processes and robust
remote connections, mode 1 is usually sufficient. If the remote system
is a bit slow, mode 2 may be required. Mode 3 has proven invaluable
when connected to routers and clusters which provide rudimentary terminal
control. Mode 4 is rarely required, but acts as a backup to mode
3.
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
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