If you want to script some process, passing it input as though a real user were 
typing, "expect" is a good tool to use.

http://www.nist.gov/mel/msid/expect.cfm

I'm not sure if it will help your sigint problem, but it should be immune to 
the CLEARINPUT verb...


Ian McGowan
925.609.2554


-----Original Message-----
From: [email protected] 
[mailto:[email protected]] On Behalf Of 
[email protected]
Sent: Monday, August 16, 2010 8:40 AM
To: U2 Users List
Subject: Re: [U2] Sending interrupt to UniBasic program

Thanks to the suggestions from various posters, I have determined that my 
incriminations of screen were malicious libel. It's not screen. The issue 
of not being able to send an interrupt (e.g.  kill -2/SIGINT) is a result 
of how I had to work around something in the third-party code I'm trying 
to automate. 

There are a couple input prompts, e.g. "do you want to continue? y/n" that 
I originally tried to handle with DATA statements. But the 3rd party 
software is doing something to clear the input stack. I've tried a few 
different workarounds, including hacking the CLEARINPUT verb, with no 
success. I finally got it work by doing a PCPERFORM as follows:

        PCPERFORM 'echo PROGNAME\\nY\\n\\n\\n | udt'

This works great except that a SIGINT issued to the newly spawned udt 
process has not effect. A straight kill works, but it actually kills the 
udt process which is precisely what I do *not* want to happen.

Any creative thoughts on how to get a SIGINT to work? Maybe a different 
way of calling PROGNAME? Talking to the vendor about changing their code 
is a theoretical option, but involves $ and a good deal of time, so is not 
preferred.

TIA,
Brad.
U.S. BANCORP made the following annotations
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