On Fri, Sep 17, 2004 at 12:02:08PM -0400, Matt Price wrote:
> Dave Howorth wrote:
>
> >>know whether there's a way to contact the server directly to see
> >>whether it's
> >>REALLY running....
> >
> >
> >The simplest way to me is to write an X client program that just makes a
> >connection, then disconnects. Something like this in fact:
> >
> >#include <X11/Xlib.h>
> >#define DISPLAY ":0.0"
> >
> >int main(argc, argv) int argc; char **argv; {
> > exit(XOpenDisplay(DISPLAY) ? 0 : -1);
> >}
> >
> >Then cc -L/usr/X11R6/lib -lX11 xtest.c
> >
> >Cheers, Dave
> >
> >
> thanks dave, that's very cool. now... I don't program in c. would it
> be easy to modify this program in two ways:
> 1) pass the display number as a parameter
> 2) print or return a specific error message if the connection is not
> accepted?
-- NEW VERSION --
#include <X11/Xlib.h>
int main(argc, argv) int argc; char **argv; {
exit(XOpenDisplay(NULL) ? 0 : 1);
}
-- END --
$ gcc -o xprobe xprobe.c -L/usr/X11R6/lib -lX11
Now:
xprobe from an xterm: Connects to the xterm's server
xprobe from .xinitrc: Connects to new server
xprobe from a VT: Fails
DISPLAY=display xprobe Connects to display 'display'
As for an error message, here's what I'd do:
xprobe || echo "Foo! server not responding?" >&2
>
> Matt
>
>
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