Re: permission denied in cygwin

[Christian Franke]

Antonio Diaz Diaz wrote:
> Christian Franke wrote:
> > The problem is that no errno is offered for "unspecified" errors
>
> IMHO the problem is the existence of "unspecified" errors. Ddrescue 
> needs that the system returns 2 different kinds of errors: non-fatal 
> (temporary or affecting just a sector, for example) and fatal 
> (permanent, like EACCES "Permission denied").
>
> If the system returns a fatal error code for a non-fatal error, 
> ddrescue quits prematurely.
>
> If the system returns a non-fatal error code for a fatal error, 
> ddrescue marks the rest of the drive as "bad-sector" and rescues nothing.
>
> > and interestingly also not for "media changed".
>
> Maybe ESTALE could be used for "media changed".

Further experiments and comparison with Linux behavior suggests that 
ENODEV is a reasonable mapping. See related upstream commit:
https://cygwin.com/git/?p=newlib-cygwin.git;a=commitdiff;h=4af5f9d

Regards,
Christian