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To: rc@archone.tamu.edu
Subject: signals and suchlike
Date: Fri, 14 Feb 1992 22:08:13 -0600
From: schwartz@groucho.cs.psu.edu
Message-Id: <92Feb14.230816est.2538@groucho.cs.psu.edu>


Using rc-1.3b, some questions about signals...

; whatis sigint		# implicitly ignored, right?
sigint not found	# so why not say so?
; fn sigint {}		# set to ignored
; whatis sigint		# not the same?
fn sigint {}		# hmm

The man page says that signals are reset to their default
values in subshells.  CHANGES says that ignored signals
stay ignored.   It seems like the man page is correct, though:

; cat x
#!/bin/rc
whatis sigint
sleep 100000

; hup x		# hup runs x in the process group of the tty, so it
		# receives signals, but also sets sigint to sig_ign.
sigint not found
; ^C		# this kills x.

An analogous /bin/sh script behaves as expected.