🚀 go-pugleaf

In article <31F7E0C5.218D@icf.hrb.com>, Michael Kerry  <msk@icf.hrb.com> wrote:
>Can anyone give me a hint as to how to go about writing a perl script to
>act as an interface to gnuchess?  I am not concerned with a graphical
>interface at this point, just the mechanics of inputing moves to the
>gnuchess engine and then receiving responses.  
>
>I tried fiddling around with opening a handle to "gnuchessc |" and
>reading from it (which seemed to work), but then how do you input moves?
>Is there a bi-directional pipe?!?  Surely there's a more clever way...

Reading to and writing using pipes can easily cause a program
to deadlock.  Check out open2.pl or open3.pl for some help.

Programs can deadlock when they

	- generate input for a program 
	- waiting for output from the program
	- while the program is waiting on more input.

So unless you know exactly what data to send to a program so that
it does not expect more data before it outputs your perl program
may hang forever.

Of course you can use timeouts for this.  

-- 
Quentin Fennessy			AMD, Austin Texas