Re: permission denied in cygwin

[Christian Franke]

Antonio Diaz Diaz wrote:
> > and interestingly also not for "media changed".
>
> Maybe ESTALE could be used for "media changed".

Sounds reasonable.


> > Any suggestion for a better fallback errno?
>
> Once the system mixes fatal and non-fatal errors (for example by 
> returning ERROR_MEDIA_CHANGED instead of EIO) any mapping will make 
> ddrescue behave incorrectly one way or the other.
>
> In addition to all this, option '-O, --reopen-on-error' only has 
> effect during the copying phase, when data are copied in large blocks. 
> Therefore the proposed '--continue-on-errno' would make ddrescue 
> behave incorrectly during trimming, scraping, and retrying.

Add --reopen-on-error[=copying|always] ?


> > > Therefore I propose the following simpler change:
> > > [...]
> > Great, this would help.
>
> OK. I'll release a test version as soon as I have it implemented.
>
> > For diagnostics of possible other "interesting" behavior, it would also
> > be helpful to see an errno if interpreted as non-fatal but with
> > unexpected value, e.g. different from EIO.
>
> The problem is to find a way for ddrescue to show such errno values, 
> as there may be thousands of failed reads per second.

But there are not thousands of different errno values :-)

Which errno != EIO do typically occur on Linux, FreeBSD etc after read 
errors ?


> (Maybe adding an errno field to the output of '--log-reads').

This is IMO an obvious place.

Thanks,
Christian