On Wed, May 01, 2019 at 03:18:51PM +0100, r...@metamail.co wrote:
> Hello and thanks,
>
> > >
> > > The pattern for the implementation is (AFAICT) right out of the book
> > >
> >
> > You are returning a "short" read, and then disallowing ppos to be set to a
> > non-zero value? That's a recipie
> my guess is your are not returning EOF (= 0). User space expects a return
> value of 0 (EOF) to terminate reading. But your code will always return
> sizeof("Hello world\n"). A fix would be to not only increment ppos, but also
> check if it's already behind your data.
>
> Regards,
>
> Martin
T
Hi,
my guess is your are not returning EOF (= 0). User space expects a
return value of 0 (EOF) to terminate reading. But your code will always
return sizeof("Hello world\n"). A fix would be to not only increment
ppos, but also check if it's already behind your data.
Regards,
Martin
Am 30.04.19
On Tue, Apr 30, 2019 at 12:45:08PM +0100, r...@metamail.co wrote:
> Greetings,
>
> My I2C sensor driver has a debugfs entry for development purposes.
> Everything works fine with the exception of the read operation. When 'cat'
> is used, the read operation is called repeatedly and indefinitely. If
