[Digikam-users] FIXED: 0.9.3 & Canon 400D: No thumbnails, then segfaults

[Gilles Caulier]

Thanks Mark this report....

Gilles Caulier

2008/6/13 Mark Ovens <parish at magichamster.com>:
> This turned out to be a problem with libusb in FreeBSD. There must have
> been a change in digikam between 0.9.2 and 0.9.3 that exposed this as I
> was using the same version of libusb with both versions of digikam.
>
> Someone responded to my request on the FreeBSD mailing lists for help
> with the debugging as they were having similar (but not identical)
> problems with a Nikon D60.
>
> Huge thanks to Markus Brueffer for tracking this down and coming up with
> a patch.
>
> Here's a couple of messages from him explaining the problem with hsi D60
> and the solution.
>
>  > > Anyway, digikam has severe problems with the Nikon D60 as well
>  > > (only partly downloading images, camera not accessible after
>  > > downloading and failing on some images, etc). Although these are
>  > > different than your specific problem, the actual cause of the
>  > > problem is probably the same as digikam 0.9.2 works just fine.
>
>  > I finally found the cause of the problem (at least the one that
>  > happens here with the Nikon D60, but I'm confident that it's the
>  > cause of yours as well). What happens is the following:
>  >
>  > When downloading data form the camera, digikam invokes
>  > usb_bulk_read from libusb through the libgphoto2 functions.
>  > usb_bulk_read uses read(2) to get data from the camera.
>  > read(2) now gets interrupted by a signal (SIGCHLD) that
>  > gets delivered to digikam and returns with EINTR, which is the
>  > actual cause of the problem. The attached patch for libusb
>  > suspends signal delivery during bulk reads and writes for
>  > SIGCHLD which lets read(2) succeed and the signal
>  > gets delivered to digikam after the read(2) call.
>
> I've closed the bug I opened about this
> http://bugs.kde.org/show_bug.cgi?id=156420
>
> Oh, the segfault problem was solved ages ago - cause was compiling
> SQLite3 with FTS options.
>
> Regards,
>
> Mark
>
>
>
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