On Saturday, 5 March 2022 00:31:43 PST Tobias Leupold wrote:
> f it's only the SANE backend that breaks this, you're of course right.
Unfortunately, we can't be sure of that. It's hard to get Unix signals right
(we're discussing another instance of it in Qt right now, on [1])
> Within what I
> It shouldn't have any side-effects. In fact, the code exists to *avoid*
> side-effects in the first place.
>
> Of course, it assumes that there isn't buggy code elsewhere. If there is,
> then all bets are lost. I'm not going to document how to bugfix other code,
> especially complex code like
On Friday, 4 March 2022 13:47:07 PST Tobias Leupold wrote:
> I don't know if this would be still possible for the Qt 5 docs, but a small
> hint like "If you subclass this, be aware that ..." woudn't hurt ... As
> said, I would never have thought that this would have such side-effects!
It
> It's a side-effect. The problem is the QProcess::setupChildProcess virtual
> in Qt 5, that had been there since QProcess was introduced the the
> Paleolithic Era. When we use CLONE_PIDFD, we have to call clone() directly,
> which means the hooks installed by pthread_atfork() do not get run. In
>
On Friday, 4 March 2022 10:52:00 PST Tobias Leupold wrote:
> I simply made this a QObject subclass and rather then using start() etc.
> directly, I created a QProcess object and did the same stuff with this one.
>
> No freezes anymore. No matter what scanner I use.
>
> I never thought
Hey Thiago,
Am Freitag, 4. März 2022, 18:35:23 CET schrieb Thiago Macieira:
> And this is the reason why you got the symptom of QProcess breaking. We'd
> have expected that the eight mention be the same as the fifth, to keep the
> pattern going, but it isn't. It's the same as the second and sixth
On Friday, 4 March 2022 09:02:37 PST Thiago Macieira wrote:
> > I uploaded the traces here:
> > https://l3u.de/tmp/strace_brscan.txt.xz
> > https://l3u.de/tmp/strace_plustek.txt.xz
> >
> > Thanks again for all help!
>
> I'll take a look. Let's see... the brscan trace doesn't have any use of
>
On Thursday, 3 March 2022 23:32:11 PST Tobias Leupold wrote:
> I did it like this. I created one strace for the scanner not causing
> problems and scanned two pages. This resulted in 27,096 lines of output.
>
> Then I created one for the scanner causing the issue, also scanning two
> pages. This
Hi Thiago and all,
thanks a lot for the input so far! I'm really a bit lost here ...
Am 04.03.22 um 01:06 schrieb Thiago Macieira:
> Fix the problem where the problem is.
I would really love to, esp. if this could be some upstream issue. And
if not, I'd also love to fix it ;-)
You can
On Thursday, 3 March 2022 11:00:07 PST Tobias Leupold wrote:
> Am Donnerstag, 3. März 2022, 19:06:21 CET schrieb Stefan Brüns:
> > Are you using either Qt5 < 5.15 or a kernel version which does not support
> > CLONE_FD? - then you are relying on SIGCHLD for process exit notification.
> >
> >
Am Donnerstag, 3. März 2022, 19:06:21 CET schrieb Stefan Brüns:
> Are you using either Qt5 < 5.15 or a kernel version which does not support
> CLONE_FD? - then you are relying on SIGCHLD for process exit notification.
>
> CLONE_FD: https://lwn.net/Articles/636646/
> Qt5:
On Donnerstag, 3. März 2022 13:54:32 CET Tobias Leupold wrote:
> Hi all :-)
>
> I have a very odd problem, and I have no idea what could cause this or even
> how to debug this. maybe, someone of you can give me a hint.
>
> I revently wrote a small helper program for one special purpose: Scanning
Hi Klaas!
> Interesting, I wrote a very similar little utility called PDFQuirk:
> https://dragotin.github.io/quirksite/
Well, apparently, this is a quite common task to do ;-)
> PDFQuirk has a very similar idea, yet it does not use libksane, but the
> command line tool scanimage directly,
Am 03.03.22 um 13:54 schrieb Tobias Leupold:
Hi Tobias,
I have a very odd problem, and I have no idea what could cause this or even
how to debug this. maybe, someone of you can give me a hint.
I revently wrote a small helper program for one special purpose: Scanning
documents at a defined
Hi all :-)
I have a very odd problem, and I have no idea what could cause this or even
how to debug this. maybe, someone of you can give me a hint.
I revently wrote a small helper program for one special purpose: Scanning
documents at a defined size, post processing them a bit and saving the
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