How to watch file descriptor activity via GMainLoop?

[Toralf Lund <toralf procaptura com>]

I'm trying to integrate a raw socket based communication link into a 
main loop using GMainLoop - on the server-side, i.e. the process that 
listens for connections on the sockets. Does anyone have any good 
examples on how this might be done? I suppose I want a callback, doing 
accept() on the socket, every time there is activity on the main file 
descriptor for the socket, and subsequently when data arrives on the 
filedescriptor(s) from accept() - but how exactly do I set this up?

Maybe GPollFd and  g_source_add_poll() are the keys here, but the 
documentation is not very clear on how to use these. Also, a normal 
GSourceFunc type callback does not quite seem suitable for this, in that 
no reference to the file descriptor will be passed (is there an 
alternative?) Also, the following note got me wondering [From the 
g_source_add_poll() doc]:

   The event source's check function will typically test the
   /|revents|/ field in the GPollFD
   <http://library.gnome.org/devel/glib/stable/glib-The-Main-Event-Loop.html#GPollFD>
   struct and return |TRUE|
   <http://library.gnome.org/devel/glib/stable/glib-Standard-Macros.html#TRUE--CAPS>
   if events need to be processed.

Shouldn't the function do the actual event handling, and return true or 
false based on whether or not the GMainLoop should keep watching for 
activity?

I'm confused... Help, anyone?

- Toralf



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