/*
 * 'dev_random.c' created: Sun Oct 13 00:24:52 2002
 *
 * Copyright 2002 by Lubomir Host <8host AT pauli.fmph.uniba.sk>
 *
 * License: GNU GPL (GNU Public License)
 *
 */

/* $Platon$ */

#ifdef HAVE_CONFIG_H
#  include "config.h"
#endif

#include <stdio.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>

#include "main.h"
#include "dev_random.h"

RNG_device_t rng_dev_random = {
	"/dev/random",
	-1, 0, 500,
	255, 0,
	open_dev_random,
	read_dev_random,
	close_dev_random
};


int open_dev_random(void)
{
	int retval = RNG_OK;

	rng_dev_random.fd = open("/dev/random", O_RDONLY);

	if (rng_dev_random.fd == -1)
		retval = RNG_FAIL;

	return retval;
}

Real_t read_dev_random(void)
{
	Real_t retval;
	ssize_t size;
	unsigned char ret;

	/* fprintf(stderr, "Read from device /dev/random.\n"); */
	size = read(rng_dev_random.fd, &ret, 1);
	retval = (Real_t) ret;
	if (size == -1)
		fprintf(stderr, "Read from device /dev/random failed!\n");

	return retval;
}

int close_dev_random(void)
{
	int retval = RNG_OK;

	fprintf(stderr, "Device /dev/random sucessfully closed.\n");
	retval = close(rng_dev_random.fd);

	return retval;
}

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