transient.c
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/* cc transient.c -o transient -lX11 */
#include <stdlib.h>
#include <unistd.h>
#include <X11/Xlib.h>
#include <X11/Xutil.h>
int main(void) {
Display *d;
Window r, f, t = None;
XSizeHints h;
XEvent e;
d = XOpenDisplay(NULL);
if (!d)
exit(1);
r = DefaultRootWindow(d);
f = XCreateSimpleWindow(d, r, 100, 100, 400, 400, 0, 0, 0);
h.min_width = h.max_width = h.min_height = h.max_height = 400;
h.flags = PMinSize | PMaxSize;
XSetWMNormalHints(d, f, &h);
XStoreName(d, f, "floating");
XMapWindow(d, f);
XSelectInput(d, f, ExposureMask);
while (1) {
XNextEvent(d, &e);
if (t == None) {
sleep(5);
t = XCreateSimpleWindow(d, r, 50, 50, 100, 100, 0, 0, 0);
XSetTransientForHint(d, t, f);
XStoreName(d, t, "transient");
XMapWindow(d, t);
XSelectInput(d, t, ExposureMask);
}
}
XCloseDisplay(d);
exit(0);
}