Re: [9fans] fd and /srv filesystem

[ori@eigenstate.org]

Quoth Chris McGee <newton688@gmail.com>:
> 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
> 

it's all just Chans in the kernel; devsrv just provides
a way of giving an open chan a name in the namespace.


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