Path: utzoo!attcan!utgpu!watmath!att!tut.cis.ohio-state.edu!gem.mps.ohio-state.edu!ginosko!uunet!mcvax!ukc!stl!stc!kings!russell
From: russell@kings.co.uk (Russell Brown)
Newsgroups: comp.unix.wizards
Subject: Anyone understand SXT's (Sys V)
Keywords: sxt sys V
Message-ID: <9@kings.co.uk>
Date: 9 Aug 89 15:41:45 GMT
Organization: King Bros ltd, Peterborough, England
Lines: 25


Does anyone understand how the sxt mechanisms work on Sys V.{2,3} ? I have the
sxt(7) man entry which tells me something but not enough. I also have the
shl(1) utility which works in it's own fashion but again doesn't give the 
game away.

I understand how to open /dev/sxt/??0 and fire up the multiplexing with
the ioctls specified in sxt(7). Whats really got me though is how the
controlling process (ie shl) knows that I've thumped the ^Z key and should
pop back into life.

In time honoured tradition I've RTFM'd and grovelled through /usr/include/*.h
to no avail. I cannot seem to find any answers. 

Any help/clues would be greatly appreciated.

Many thanks.
	Russell
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