Created
October 9, 2013 07:55
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I use this on a monitoring screen to get my attention: It make the screen flash multiples times (X11)
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#include <unistd.h> | |
#include <X11/X.h> | |
#include <X11/Xlib.h> | |
#include <strings.h> | |
#include <memory.h> | |
#include <stdlib.h> | |
#include <stdio.h> | |
/* | |
* 2013/10/09. Adrien Pujol. | |
* | |
* Build me: `gcc -std=gnu99 -Wall epilepsy.c -lX11 -o epilepsy` | |
* | |
*/ | |
const long INTERVAL_MS = 500000; | |
int main () | |
{ | |
Display* dis = XOpenDisplay(NULL); | |
Atom wm_state = XInternAtom(dis, "_NET_WM_STATE", False); | |
Atom fullscreen = XInternAtom(dis, "_NET_WM_STATE_FULLSCREEN", False); | |
// White Screen Event | |
Window whiteWin = XCreateSimpleWindow(dis, RootWindow(dis, 0), 0, 0, 10, 10, | |
0, WhitePixel (dis, 0), WhitePixel(dis, 0)); | |
XEvent whiteXev; | |
memset(&whiteXev, 0, sizeof(whiteXev)); | |
whiteXev.type = ClientMessage; | |
whiteXev.xclient.window = whiteWin; | |
whiteXev.xclient.message_type = wm_state; | |
whiteXev.xclient.format = 32; | |
whiteXev.xclient.data.l[0] = 1; | |
whiteXev.xclient.data.l[1] = fullscreen; | |
whiteXev.xclient.data.l[2] = 0; | |
Window blackWin = XCreateSimpleWindow(dis, RootWindow(dis, 0), 0, 0, 10, 10, | |
0, BlackPixel (dis, 0), BlackPixel(dis, 0)); | |
XEvent blackXev; | |
memset(&blackXev, 0, sizeof(blackXev)); | |
blackXev.type = ClientMessage; | |
blackXev.xclient.window = blackWin; | |
blackXev.xclient.message_type = wm_state; | |
blackXev.xclient.format = 32; | |
blackXev.xclient.data.l[0] = 1; | |
blackXev.xclient.data.l[1] = fullscreen; | |
blackXev.xclient.data.l[2] = 0; | |
for (int i = 0; i < 5; i++){ | |
// White flash | |
XMapWindow(dis, whiteWin); | |
XSendEvent (dis, DefaultRootWindow(dis), False, | |
SubstructureRedirectMask | SubstructureNotifyMask, &whiteXev); | |
usleep(INTERVAL_MS); | |
XFlush(dis); | |
XMapWindow(dis, blackWin); | |
XSendEvent (dis, DefaultRootWindow(dis), False, | |
SubstructureRedirectMask | SubstructureNotifyMask, &blackXev); | |
usleep(INTERVAL_MS); | |
XFlush(dis); | |
} | |
return(0); | |
} |
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