Writing to an exsisting entry in /proc

[Mark Hounschell <dmarkh@cfl.rr.com>]

I can see how to create and read/write the proc file system by looking
at examples in the kernel source tree. However I do not see how to write
to an exsisting entry from my kernel module. I see plenty of examples of
create, read, and write, bit no "open". How can I open for write/read an
exsisting entry without having to create first???

Thanks and regards
Mark
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