debugfs question ...

rdq at rdq at
Wed May 1 08:06:58 EDT 2019

> 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

Thank you, Martin, help much appreciated. It's a bit of a mystery but neither works for me. More detail in my reply to Greg KH.

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