[gpsd-users] gpsd performing orderly socket shutdown

[Tomalak Geret'kal]

Ohai

We're connecting directly to gpsd 3.4 via local TCP/IP, 
pulling the NMEA stream and doing our own parsing.

(Whilst this is neither here nor there, the reason is that 
we really just want to use gpsd as a multiplexer, since our 
hardware has a large number of proprietary sentences making 
extending gpsd less viable than just implementing our own 
basic parser for our own sentences, without support for all 
the stuff that we know we don't have. It also means we don't 
need to modify gpsd at all.)

Our approach is pretty simple... a `select` call followed by 
a `read` call, in a loop. The socket is a blocking socket.

Intermittently, though, (say every 3-8 hours) on a 
particular device, we're seeing `select` return >0 then 
`read` return 0. Allegedly this non-error condition implies 
an orderly shutdown on the remote end.

So my question is, **under what circumstances might gpsd 
perform a shutdown of a client connection**? Any at all?

Cheers
Tom