#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdbool.h>

#include <stdlib.h>
#include <termio.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <errno.h>
#include <X11/Xlib.h>
#include <X11/Xutil.h>

typedef socklen_t SOCKLEN_TYPE;

const char *BROAD_ADDR="224.1.1.2";
const int BROAD_PORT=19260;

int s;
void reportError(const char *msg) {
	fprintf(stderr,"%s: %s(ErrorCode:%d)\n",msg,strerror(errno),errno);
}

int main() {
	int TIME_LIVE = 256;

	if ((s=socket(AF_INET,SOCK_DGRAM,0))<0) {
		reportError("Failed to create socket");
		return 1;
	}
	
	struct sockaddr_in addr;
	memset(&addr,0,sizeof(addr));
	SOCKLEN_TYPE len=sizeof(addr);
	addr.sin_family=AF_INET;
	addr.sin_port=htons(BROAD_PORT);
	addr.sin_addr.s_addr=inet_addr(BROAD_ADDR);
	if (connect(s,(struct sockaddr*)&addr,len)<0) {
		reportError("Failed to bind socket");
		return 1;
	}
	setsockopt(s,IPPROTO_IP,IP_MULTICAST_TTL,(void*)&TIME_LIVE,sizeof(TIME_LIVE));
	Display* display=XOpenDisplay(0);
	Window root=DefaultRootWindow(display);
	XEvent event;

	int keycode = XKeysymToKeycode(display,0xff1b);
    XGrabKey(display,keycode,Mod2Mask,root,True,GrabModeAsync,GrabModeAsync);

	XSelectInput(display,root,KeyPressMask);
	while (true) {
		XNextEvent(display, &event);
		switch(event.type) {
			case KeyPress:
				sendto(s,"#",1,0,NULL,0);
				break;
			default:
				break;
		}
	}

	XCloseDisplay(display);
	return 0;
}