Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!iuvax!rutgers!bpa!cbmvax!ditto
From: ditto@cbmvax.UUCP (Michael "Ford" Ditto)
Newsgroups: comp.bugs.4bsd
Subject: C shell "onintr" doesn't re-enable SIGINT after "onintr -".
Summary: Add signal(SIGINT, pintr); to doonintr();
Keywords: csh onintr SIGINT SIG_IGN
Message-ID: <6373@cbmvax.UUCP>
Date: 22 Mar 89 07:09:00 GMT
Reply-To: ditto@cbmvax.UUCP (Michael "Ford" Ditto)
Organization: Commodore Technology, West Chester, PA
Lines: 54

Observed-in:
	4.3BSD (Tahoe), and Ultrix V2.2

Description:
	C shell "onintr" doesn't re-enable SIGINT after "onintr -".

Repeat-by:
	Put the following lines in ~/.login (or just source them):

		echo starting...
		onintr -	# temporarily disable interrupts
		sleep 5		# this is non-interruptible
		onintr		# (supposed to) re-enable interrupts
		echo done

	After the above file has been sourced, the interrupt character
	is ignored.

My Fix:
	Patches to 4.3BSD Tahoe source:
	sh.func.c	5.5 (Berkeley) 5/19/88

*** ORIGsh.func.c	Wed Mar 22 01:10:35 1989
--- sh.func.c		Wed Mar 22 01:26:41 1989
***************
*** 92,100
  		bferr("Can't from terminal");
  	cp = gointr, gointr = 0, xfree(cp);
  	if (vv == 0) {
! 		if (setintr)
! 			(void) sigblock(sigmask(SIGINT));
! 		else
  			(void) signal(SIGINT, SIG_DFL);
  		gointr = 0;
  	} else if (eq((vv = strip(vv)), "-")) {

--- 92,101 -----
  		bferr("Can't from terminal");
  	cp = gointr, gointr = 0, xfree(cp);
  	if (vv == 0) {
! 		if (setintr) {
! 			(void) sigblock(sigmask(SIGINT));
! 			(void) signal(SIGINT, pintr);
! 		} else
  			(void) signal(SIGINT, SIG_DFL);
  		gointr = 0;
  	} else if (eq((vv = strip(vv)), "-")) {
-- 
					-=] Ford [=-

"The number of Unix installations	(In Real Life:  Mike Ditto)
has grown to 10, with more expected."	ford@kenobi.commodore.com
- The Unix Programmer's Manual,		...!sdcsvax!crash!kenobi!ford
  2nd Edition, June, 1972.		ditto@cbmvax.commodore.com