Mail Archives: cygwin/2001/02/03/13:19:58
On Sat, Feb 03, 2001 at 12:47:49PM -0500, Robin T. Miller wrote:
> Hi All,
> I have a Unix test program named 'dt' which runs with Cygwin.
> This program tests a variety of devices as well as file systems. The
> tests which use lseek() to raw mounted disks, are failing with data
> compare errors. It appears either lseek() is positioning incorrectly
> or read() is returning the wrong data after lseek'ing.
>
> This random I/O sequence seems to work correctly to a regular
> file, so maybe the raw device buffering is messing up? I'm not sure.
Lseek on raw devices isn't yet fully implemented. The underlying
*cough* operating system *cough* isn't able to do a bytewise access
to the raw device but only in steps of 512 bytes. A full lseek
implementation would need to do it's own buffering to simulate
bytewise buffering. This is still missing.
> The only other program restrictions is 32-bit file offsets.
>
> BTW: Are there any plans to release 64-bit file support?
Not in the near future.
Nobody would complain about contributions, though...
Corinna
--
Corinna Vinschen Please, send mails regarding Cygwin to
Cygwin Developer mailto:cygwin AT cygwin DOT com
Red Hat, Inc.
--
Want to unsubscribe from this list?
Check out: http://cygwin.com/ml/#unsubscribe-simple
- Raw text -