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/*
 * Flashes root window when RING modem status detected
 *
 */

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <termios.h>
#include <signal.h>
#include <sys/stat.h>
#include <linux/serial.h>
#include <X11/X.h>
#include <X11/Xlib.h>

#define FALSE 0
#define TRUE 1

#define FLASH_BG   0xff0000
#define DEFAULT_BG 0x00008b

#define CAPS_LED 1
#define SLEEPTIME 10

Display *dpy;
Window win;

unsigned long old_fg;
int tty;


void flash(void)
{
	int i;

	for (i = 0; i < SLEEPTIME; i++) {
		XSetWindowBackground(dpy, win, FLASH_BG);
		XClearWindow(dpy, win);
		XFlush(dpy);
		usleep(500000);
		XSetWindowBackground(dpy, win, DEFAULT_BG);
		XClearWindow(dpy, win);
		XFlush(dpy);
		usleep(500000);
	}
}


void cleanup(int sig)
{
	XSetWindowBackground(dpy, win, DEFAULT_BG);
	XClearWindow(dpy, win);
	XFlush(dpy);
	XCloseDisplay(dpy);
	close(tty);
	raise(sig);
}


void init(void)
{
	XGCValues gcv;

	if ((tty = open("/dev/cua3", O_RDWR)) == -1) {
		perror("open");
		exit(1);
	}
	signal(SIGTERM, cleanup);
	dpy = XOpenDisplay(NULL);
	win = RootWindow(dpy, 0);
}


void main(void)
{
	int old_count;
	struct serial_icounter_struct cs;

	init();

	ioctl(tty, TIOCGICOUNT, &cs);
	old_count = cs.rng;

	while(1) {
		ioctl(tty, TIOCGICOUNT, &cs);
		if(cs.rng != old_count) {
			flash();
			old_count = cs.rng;
		} else
			usleep(500000);
	}
}
.

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