spam.c

/*
 * 1. Compile it: gcc spam.c -lX11 -lXrandr -Wall -Wextra -Werror -std=c89 -O3 -pedantic-errors -o spam
 * 2. Start monitoring the journal: journalctl -f
 * 3. Run the program in a loop: while true; do ./spam && sleep 1; done
 * 4. Observe the journal being spammed (GNOME-only)
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <X11/Xlib.h>
#include <X11/extensions/Xrandr.h>

int main(void)
{
    char    *dpy;
    Display *xdpy;
    Window   root;
    XRRScreenResources *srs;

    dpy = getenv("DISPLAY");
    xdpy = XOpenDisplay(dpy);

    if (!xdpy) {
        fprintf(stderr, "Unable to open X display '%s': %s\n", dpy, strerror(errno));
        return 1;
    }
    root = DefaultRootWindow(xdpy);
    srs = XRRGetScreenResources(xdpy, root); /* <-- journal spam happens here */

    XRRFreeScreenResources(srs);
    XCloseDisplay(xdpy);

    return 0;
}