Path: utzoo!attcan!uunet!lll-winken!lll-lcc!ames!umd5!cvl!elsie!ado
From: ado@elsie.UUCP (Arthur David Olson)
Newsgroups: comp.unix.questions
Subject: Re: Is typeahead loss a generic ksh problem?
Message-ID: <8067@elsie.UUCP>
Date: 19 May 88 21:58:11 GMT
References: <8062@elsie.UUCP>
Organization: NIH-LEC, Bethesda, MD
Lines: 17

Thanks to everyone who replied to the original posting.  The problem turned
out to be that if you run a command such as
	( sleep 5 ; echo hi ) | exit
the "echo hi" is terminated by a SIGPIPE signal.  Ksh (or at least the version
of ksh in use at elsie) waits for all elements of a pipeline to complete
before prompting again.  It noticed that the SIGPIPE death had occurred,
and assumed (in "reset_ttygrp", for those keeping score) that some tty cleanup
should be done.

The fix (in "await") was to change a
			reset_ttygrp(pw,w&LOBYTE);
call to
			if ((w&LOBYTE)==SIGPIPE)
				reset_ttygrp(pw,0);
			else	reset_ttygrp(pw,w&LOBYTE);
-- 
    Canada's program is to spaceflight as the carrier pigeon is to mail.
	ado@ncifcrf.gov			ADO is a trademark of Ampex.