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From: arnold@cc.gatech.edu (Arnold Robbins)
Message-Id: <9204072118.AA00942@terminus.cc.gatech.edu>
Date: Tue, 7 Apr 1992 16:18:00 -0500
X-Ultrix: Just Say NO!
X-Important-Saying: Premature Optimization Is The Root Of All Evil.
X-Mailer: Mail User's Shell (7.2.3 5/22/91)
To: rc@archone.tamu.edu
Subject: signal blocking?

Is there an easy way to block a signal inside a signal handler?  I'm using
MGR from BellCore (fast!), and I've been trying to set up a signal handler
for SIGWINCH so that the rows and columns in stty get reset whenever I resize
a window.  However, when you do an stty of the rows and columns, MGR
kindly sends you another SIGWINCH too!  So I need to temporarily block
SIGWINCH (ignore it basically) inside my SIGWINCH handler.

Here's what I ended up doing.  Simple, but not terribly elegant.  Note
that the trailing sleep is needed or else the SIGWINCH comes in before
we're ready.

fn handle_winch {
size=() {
	fn sigwinch 	# temporary
	stty -echo
	echo '4I'
	size=(`{gawk '{ printf "%d %d\n", $3/12, $4/20 ; exit }'})
	stty echo
	stty columns $size(1) rows $size(2)
	sleep 1
	fn sigwinch { handle_winch }
} }

fn sigwinch { handle_winch }
--
Arnold Robbins --- College of Computing			| Laundry increases
Georgia Tech, Atlanta, GA 30332-0280			| exponentially in the
Domain: arnold@cc.gatech.edu	 Phone: +1 404 894 9214 | number of children.
UUCP: uunet!cc.gatech.edu!arnold FAX:   +1 404 853 9378 |  -- Miriam Robbins