Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!ncar!boulder!bill
From: bill@boulder.Colorado.EDU
Newsgroups: comp.sys.hp
Subject: bug? -- XDrawLine can freeze HP-UX 6.5 X server
Message-ID: <17056@boulder.Colorado.EDU>
Date: 16 Feb 90 19:32:50 GMT
Sender: news@boulder.Colorado.EDU
Reply-To: bill@synapse.Colorado.EDU (Bill Skaggs)
Organization: University of Colorado, Boulder
Lines: 22


  I think I've found something nasty, and I wonder if anybody
can tell me what's going wrong and what to do about it.

  I'm writing a program that does graphics in an X window,
and at a certain point, during an XDrawLine call, my
display freezes and I have no choice except to kill the
X server.  This is under HP-UX 6.5 -- we don't have 7.0
here yet; and it's on an HP 370.

  The arguments to XDrawLine (corresponding to
XDrawLine(display, d, gc, x1, y1, x2, y2)) are x1 = 19642,
y1 = 25985, x2 = -9529, y2 = -20184.  These numbers are very
big, of course, but I don't want to fool with them, because
with clipping it is possible that part of the line will pass
through my window.  Anyway, it doesn't seem reasonable for
bad arguments to a function to break the server.  (Incidentally,
I know the other arguments are correct.)

  Is this a server bug?  Can anyone from HP comment?

	-- Bill Skaggs