mirror_zfs/lib/libspl/include/sys/random.h

// SPDX-License-Identifier: CDDL-1.0
/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or https://opensource.org/licenses/CDDL-1.0.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
 * Copyright 2011 Nexenta Systems, Inc.  All rights reserved.
 * Copyright (c) 2012, 2018 by Delphix. All rights reserved.
 * Copyright (c) 2012, Joyent, Inc. All rights reserved.
 */

#ifndef _SYS_RANDOM_H
#define	_SYS_RANDOM_H

extern int random_get_bytes(uint8_t *ptr, size_t len);
extern int random_get_pseudo_bytes(uint8_t *ptr, size_t len);

extern void random_force_pseudo(boolean_t onoff);

static __inline__ uint32_t
random_in_range(uint32_t range)
{
	uint32_t r;

	ASSERT(range != 0);

	if (range == 1)
		return (0);

	(void) random_get_pseudo_bytes((uint8_t *)&r, sizeof (r));

	return (r % range);
}

#endif	/* _SYS_RANDOM_H */