read(): varblk tape records...(& Fix for : read())

Corinna Vinschen
Tue Mar 2 12:03:00 GMT 2004

On Mar  2 10:51, Jason Winter wrote:
> Hi Corinna,
> Rereading the MSDN: Q161338 document I refered to before, Cygwin will need 
> to use a minimum 128KB buffer when 'reading' data from tapes - the NT 
> specification doesn't allow access to the 'last bytes' in a variable-block 
> any other way.  128KB allows for any SCSI device under windows.

If you have a look into the source code, you'll see that Cygwin in variable
block size case creates a buffer of the maximum block size allowed by the
tape drive (or driver), returned by GetTapeParameters().

I've not investigated so far if read behaves correctly or not, but now
I understand what you're up to.  I'll look into it.


Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Developer                      
Red Hat, Inc.

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