Hi All,

I was thinking about file descriptors in the context of Plan 9. On Unix an
fd is generally only usable by the current process, and child ones through
a fork with some special incantation if one wants to communicate one over a
domain socket. This is possibly for security reasons, avoiding other users'
processes from trying to guess the fd of a critical file.

It's common practice in Plan 9 to post an fd (sometimes via a pipe) from
one process to the /srv filesystem so that others can discover it and open
a comms channel. Does the kernel transform the fd into something when
posted to /srv so that it can be consumed by any other process in the
system?

Thanks,
Chris

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