From: Sven Wischnowsky <wischnow@informatik.hu-berlin.de>
To: zsh-workers@sunsite.auc.dk
Subject: Re: zsh-3.1.9-dev-6 crashes occassionally
Date: Tue, 31 Oct 2000 15:01:03 +0100 (MET) [thread overview]
Message-ID: <200010311401.PAA00843@beta.informatik.hu-berlin.de> (raw)
In-Reply-To: Peter Stephenson's message of Tue, 31 Oct 2000 13:51:35 +0000
Peter Stephenson wrote:
> Sven wrote:
> > + ALLOWTRAPS {
> > + while ((r = read(SHTTY, &cc, 1)) != 1) {
>
> I suppose you've thought this through more than I have, but wouldn't it be
> safer just to run traps every time the read returns? I'm assuming a signal
> arriving will interrupt the read in any case, so as far as I can see it's
> pretty much equivalent in practise. There's nothing too nasty in the block
> underneath, but it does call zrefresh() and attachtty() which are probably
> best treated as black boxes.
Hmhm. I was about to say that traps are only insecure when they can
execute code the non-trap code currently executes, but, yes, since one
can invoke more and more code from shell code...
Maybe I should have a second (third, fourth,...) look to see if we can
get rid of this ALLOWTRAPS { ... } DISALLOWTRAPS stuff altogether. That
would make me more comfortable, I think.
Unless someone knows of a system where signals don't interrupt things
like read.
Bye
Sven
--
Sven Wischnowsky wischnow@informatik.hu-berlin.de
next prev reply other threads:[~2000-10-31 14:01 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2000-10-31 13:19 Sven Wischnowsky
2000-10-31 13:51 ` Peter Stephenson
2000-10-31 14:01 ` Sven Wischnowsky [this message]
2000-10-31 15:25 ` Bart Schaefer
2000-10-31 15:43 ` Andrej Borsenkow
-- strict thread matches above, loose matches on Subject: below --
2000-11-08 10:54 Sven Wischnowsky
2000-11-08 9:41 Sven Wischnowsky
2000-11-08 10:33 ` Thomas Köhler
2000-11-01 9:41 Sven Wischnowsky
2000-11-03 15:42 ` Bart Schaefer
2000-11-05 17:55 ` Thomas Köhler
2000-10-31 15:42 Sven Wischnowsky
2000-10-30 10:25 Sven Wischnowsky
2000-10-30 8:32 Sven Wischnowsky
2000-10-30 9:56 ` Peter Stephenson
2000-10-30 10:10 ` Thomas Köhler
2000-10-30 16:18 ` Bart Schaefer
2000-10-24 7:53 Sven Wischnowsky
2000-10-23 13:04 Sven Wischnowsky
2000-10-23 15:12 ` Thomas Köhler
2000-10-21 12:34 Thomas Köhler
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