I've just found a need for mandatory locking in Vinum, and I'm
wondering how to implement it. If I understand things correctly, our
fcntl locking doesn't perform mandatory locking, though System V does
if you set the file permissions appropriately.
Questions:
1. Do we have some form of mandatory locking? If so, what is it?
2. Would it make sense to implement System V's fcntl semantics?
They're rather tacky: you set the setgid bit and reset the group
exec bit of the file permissions.
3. Alternatively (or additionally), would it make sense to have an
additional fcntl function which performs mandatory locking?
I think that it's probably a good idea to implement (3), and also to
do (2), possibly subject to a sysctl knob.
Greg
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