Re: restartable system calls under Linux

["Dale P. Smith" <dpsm at en dot com>]

Gary Houston wrote:
> 
> > From: "Dale P. Smith" <dpsm@en.com>
> > Date: Tue, 13 Jun 2000 16:17:56 -0400
> >
> > Well, a simple read() seems to be restartable. I suspect that readline is doing something magic.  Does anyone with more experience than I in unix terminal i/o with readline interaction care to offer
> > any suggestions?
> 
> I think you are on to something here.  It probably has something to
> do with readline: a) I don't have readline enabled and I don't see the
> problem b) I tried booting a linux 2.2 kernel and it made no difference
> c) grepping the readline 4.0 sources for SIGWINCH shows some suspicious
> sigaction calls.

It *is* something in readline.  The bug does not appear if I don't call activate-readline. What puzzles me is that SA_RESTART appears to always be set.

(= (logand (cdr (sigaction SIGWINCH)) SA_RESTART) SA_RESTART)

Always returns #t

> Maybe a solution would be to reset the SA_RESTART flag on the SIGWINCH
> handler as part of the readline enabling process?

In C or Scheme?


-Dale

-- 
Dale P. Smith
Altus Technologies Corp.
dsmith@altustech.com
400-746-9000 x309