Re: callback functions...signals ...events... process communications

[Iago Rubio <iago rubio hispalinux es>]

On Sat, 2004-11-06 at 20:08, Tristan Van Berkom wrote:
> On Fri,  5 Nov 2004 17:21:50 -0200, viola das inpe br <viola das inpe br> wrote:
> >    Hi everybody!
> >     I am francisco viola; this is my first time; they say that I'll never forget...
> >       So, I would like to know if I could attach a callback function to a signal
> > or event (?) that is fired (I mean "signaled") from inside another program
> > running in parallel? And how could this program pass a string to the callback
> > function, just before the signal firing? Does gtk offer some gadget to do these?
>
>    There is no IPC mechanism provided out of the box in Gtk+, I've always had 
> to write my own. Generaly, I usualy use unix sockets if I know I'm
> running on the  same machine, but network sockets can work as well (socket, bind, accept, 
> read, write kind of thing). Up till now, I've always used GIOChannelto add these
> sockets as event sources (GSource) to the main loop (GIOWatch), I think there is
> some kind of merge comming from the GNet library that will be integrated into
> gtk+ (I'm not 100% sure...).

Speaking about IPC, for Francisco's needs System V message queues should
work, as he wants to "call" and send a simple string to the application.

ITOH one app should be the "client" - send to the queue - and other the
"server" - listen the queue - with this approach.

Other caveat is it will not work in all *nix flavours, and of course
will not work at all on Win32.
-- 
Iago Rubio