• C

X connection to :0.0 broken (explicit kill or server shutdown)

I obtain the error message 'X connection to :0.0 broken (explicit kill or server shutdown)' when I close an X graphical window using the window manager close button.

The graphical application is written in C and uses X11 library.

Applications written using MOTIF library doesn't do so, they seem to close cleanly.

How can I get rid of this?
What event have I to manage?
LVL 3
mliberiAsked:
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zou3Connect With a Mentor Commented:
Hi,
You have to gracefully handle WM_DELETE_WINDOW protocol
message from a window manager.
For this purpose, you can use XSetWMProtocols() and check ClientMessage event.

Please refer to the following sample program.
(There's no XSelectInput() in this sample since ClientMessage
event is not maskable. You may need to call it usually, though)

Xtoolkit used by Motif handles these stuff implicitly.

Compiling/linking is as simple as;
cc -I<X11 inc path> -L<X11lib path> -o prog prog.c  -lX11

------------------ >8 ---------------------
#include <stdio.h>
#include <X11/Xlib.h>
#include <X11/Xatom.h>

main(void)
{
    Display *d;
    Window w;
    XEvent event;
    Atom    WM_DELETE_WINDOW;

    d = XOpenDisplay(0);
    w = XCreateSimpleWindow(d, RootWindow(d, 0), 0, 0, 100, 100, 2, 0, 1);

    WM_DELETE_WINDOW = XInternAtom(d, "WM_DELETE_WINDOW", True);
    (void)XSetWMProtocols(d, w, &WM_DELETE_WINDOW, 1);

    XMapWindow(d, w);

    while (True) {
        if (XPending(d)) {
            XNextEvent(d, &event);
            switch (event.type) {
            case ClientMessage:
                if (event.xclient.data.l[0] == WM_DELETE_WINDOW) {
                    fprintf(stderr, "ClientMessage with WM_DELETE_WINDOW\n");
                    exit(0);
                }
                break;
            default:
                break;
            }
        }
    }
}

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