/*
 * This file and its contents are supplied under the terms of the
 * Common Development and Distribution License ("CDDL"), version 1.0.
 * You may only use this file in accordance with the terms of version
 * 1.0 of the CDDL.
 *
 * A full copy of the text of the CDDL should have accompanied this
 * source.  A copy of the CDDL is also available via the Internet at
 * http://www.illumos.org/license/CDDL.
 */

/*
 * Copyright (c) 2018, Joyent, Inc.
 */

/*
 * getentropy(3C) is an OpenBSD compatible wrapper around getrandom(2).
 */

#include <errno.h>
#include <sys/random.h>

int
getentropy(void *buf, size_t buflen)
{
        ssize_t ret;

        if (buflen > 256) {
                errno = EIO;
                return (-1);
        }

        ret = getrandom(buf, buflen, 0);
        if (ret == -1 || ret != buflen) {
                if (errno != EFAULT)
                        errno = EIO;
                return (-1);
        }

        return (0);
}