[M3commit] CVS Update: cm3

[Jay Krell]

CVSROOT:	/usr/cvs
Changes by:	jkrell at birch.	10/03/18 11:55:48

Modified files:
	cm3/m3-tools/cvsup/suplib/src/: SigHandler.m3 

Log message:
	cleanup to use and factor out the "safe double free" pattern, e.g.
	
	procedure Close(var i)
	if i >= 0
	close(i)
	i = -1
	
	This does not address the pthreads hangs.