Re: statefulness in character device drivers

[Dave Rufino]

On Sat, 8 Dec 2001, Poul-Henning Kamp wrote:

> >They are talking about "per-open", not "per-fd-instance" data,
> >which could easily exclude dup, dup2, and fcntl(f_DUPFD).
>
> If you don't include dup/dup2/fnctl in your accounting, you
> can only reliably tell "first open", "another open", "some close"
> and "final close".  You an modulate this with the pid, but you
> still have no idea what is going on in any amount of detail.

Speaking for myself, first open and final close would be all I need for
the nvidia driver - though i'm sure tracking dup/dup2/fcntl would be
preferable in the general case.

David


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