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From: lund@ucla-cs.UUCP
Newsgroups: net.news.b
Subject: bug in vnews signal handling when replying
Message-ID: <716@ucla-cs.ARPA>
Date: Tue, 7-Aug-84 20:41:11 EDT
Article-I.D.: ucla-cs.716
Posted: Tue Aug  7 20:41:11 1984
Date-Received: Fri, 10-Aug-84 01:21:09 EDT
Organization: UCLA CS Dept.
Lines: 17

While hacking vnews to use the UCLA version of send I ran in to some
signal handling problems with SIGINT. It seems that vnews
exec()s the program in prun() and then waits for it to finish.
Our send runs in CBREAK and uses SIGINT (^C) to abort. While
vnews is waiting it ignores SIGQUIT and catches SIGINT with it's 
catcher, onint(). Onint() then renalbles the catching and does a
ioctl(0,TIOCSTI,"\0") which stuffs a null onto the input queue
which gets read by send. Our send did not appreciate this.
Now the question is why did vnews do this awful thing? I
fixed it by ignoring SIGINT while waiting for the child to finish.

			.....Laurence Lundblade
			     UCLA CS Dept.

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