5e1
/*
 * LED biff for X
 * blinks scroll lock LED when new mail
 *
 * version 1.0
 *
 */

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

#define FALSE 0
#define TRUE 1

#define SCRL_LED 3
#define SLEEPTIME 10

Display *dpy;

char mbox_name[50];

int mbox_size, mbox_flag, read_since_last_write;


void set_led(int mode)
{
	XKeyboardControl kbd;

	kbd.led = SCRL_LED;
	kbd.led_mode = mode;

	XChangeKeyboardControl(dpy, KBLed | KBLedMode, &kbd);
	XFlush(dpy);
}


void blink(void)
{
	int i;

	for (i = 0; i < SLEEPTIME; i++) {
		set_led(LedModeOn);
		usleep(500000);
		set_led(LedModeOff);
		usleep(500000);
	}
}


int check_mailbox(void)
{
	struct stat st;
	int i, n;

	if (stat (mbox_name, &st) == 0) {
		mbox_size = st.st_size;
		read_since_last_write = (st.st_atime > st.st_mtime);
	}

	if (mbox_size == 0)
		return FALSE;
	else if (read_since_last_write)
		return FALSE;
	else
		return TRUE;
}


void cleanup(int sig)
{
	XCloseDisplay(dpy);
	raise(sig);
}


void init(void)
{
	char *p;

	if (! (p = getenv("MAIL"))) {
		printf("Error: environment variable MAIL not set.\n");
		exit(1);
	}
	strcpy(mbox_name, p);
	signal(SIGTERM, cleanup);
	dpy = XOpenDisplay(NULL);
	set_led(LedModeOff);
}


void main(void)
{
	init();
	while (1) {
		if (check_mailbox())
			blink();
		else
			sleep(SLEEPTIME);
	}
}
.

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