API for changing UIDs of other processes

[Enrico Weigelt]

Hi folks,


I'd like to build some authentication daemon which alters the
privileges of another process (like factotum does on plan9).
But I couldn't find any interface for that (setuid() and friends
only operate on the current process). So I'm now going to create
my own interface.

As a little learning example I just added a few files to the
per-pid dirs: uid, euid, suid, fsuid. This was trivial :)

Now I'd like to add an write capability to these files: 
simply writing another number changes the (|s|fs)uid.

But this doesnt seem that trivial. Perhaps someone could give
me some advice ?


cu
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