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bug#57095: 'terminal-window-size' throws ENOTTY ("Inappropriate ioctl fo
From: |
Ludovic Courtès |
Subject: |
bug#57095: 'terminal-window-size' throws ENOTTY ("Inappropriate ioctl for device") |
Date: |
Thu, 01 Sep 2022 23:04:35 +0200 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/28.1 (gnu/linux) |
Hi,
Josselin Poiret <dev@jpoiret.xyz> skribis:
> We also use a big wrapping `with-error-handling` to display errors
> properly in the case when they are not caught. The difference is that
> `with-error-handling` adds a non-unwinding handler, while catch is
> unwinding. My first thought was that non-unwinding handlers, even outer
> ones would get priority over unwinding ones, since once the stack's
> unwound you can't really go back (I have no idea if that last part is
> actually true). In practice this is actually false, I tested with a
> very simple example, but that lead me to test by setting `#:unwind? #t`
> for the `guard*` definition in guix/ui.scm and the issue went away, so I'm
> clueless as to why this happens. What seems weird is that the error is
> not caught at all!
Here’s a reproducer:
--8<---------------cut here---------------start------------->8---
scheme@(guile-user)> (with-exception-handler (lambda _ (catch 'x (lambda ()
(throw 'x)) (const 'good) ))
(lambda ()
(rmdir "/"))
#:unwind? #f)
ice-9/boot-9.scm:1685:16: In procedure raise-exception:
Throw to key `x' with args `()'.
--8<---------------cut here---------------end--------------->8---
Or, simplified:
--8<---------------cut here---------------start------------->8---
scheme@(guile-user)> (with-exception-handler
(lambda _ (with-exception-handler (const 'good)
(lambda () (throw 'x))
#:unwind? #t))
(lambda ()
(rmdir "/"))
#:unwind? #f)
ice-9/boot-9.scm:1685:16: In procedure raise-exception:
Throw to key `x' with args `()'.
--8<---------------cut here---------------end--------------->8---
We expect 'x to be caught, leading the handler to return 'good.
Instead, 'x is not caught at all.
In both cases, setting #:unwind? #t in the outer
‘with-exception-handler’ gives the expected result.
I spent some time staring at the relevant code in ‘boot-9.scm’ but
nothing came out of it.
Ludo’.
- bug#57095: 'terminal-window-size' throws ENOTTY ("Inappropriate ioctl for device"),
Ludovic Courtès <=