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#include <stdlib.h>
#include <stdio.h>
#include <stdbool.h>
#include <X11/Xlib.h>
#include <X11/extensions/Xrandr.h>
int main(int argc, char **argv)
{
Display *dpy;
Window root;
XEvent event;
int dummy, screen, randr_event_base;
bool has_randr;
dpy = XOpenDisplay(NULL);
if (dpy == NULL) {
fputs("ERROR: Could not open display!\n", stderr);
return EXIT_FAILURE;
}
/* Is the randr extension available? */
has_randr = false;
has_randr = XRRQueryExtension(dpy, &randr_event_base, &dummy);
if (!has_randr) {
fputs("ERROR: RandR extension unavailable on current screen!\n", stderr);
return EXIT_FAILURE;
}
/* Get root window */
screen = DefaultScreen(dpy) ;
root = RootWindow(dpy, screen) ;
/* Notify on configuration change */
XRRSelectInput(dpy, root, RRScreenChangeNotifyMask);
while (true) {
XNextEvent(dpy, &event);
if (event.type == randr_event_base + RRScreenChangeNotify) {
return EXIT_SUCCESS;
}
}
/* should never happen */
return EXIT_FAILURE;
}
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