zfs/include/os/freebsd/spl/sys/random.h

/*
 * Copyright (c) 2007 Pawel Jakub Dawidek <pjd@FreeBSD.org>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * $FreeBSD$
 */

#ifndef _OPENSOLARIS_SYS_RANDOM_H_
#define	_OPENSOLARIS_SYS_RANDOM_H_

#include_next <sys/random.h>
#if  __FreeBSD_version >= 1300108
#include <sys/prng.h>
#endif

static inline int
random_get_bytes(uint8_t *p, size_t s)
{
	arc4rand(p, (int)s, 0);
	return (0);
}

static inline int
random_get_pseudo_bytes(uint8_t *p, size_t s)
{
	arc4rand(p, (int)s, 0);
	return (0);
}

static inline uint32_t
random_in_range(uint32_t range)
{
#if defined(_KERNEL) && __FreeBSD_version >= 1300108
	return (prng32_bounded(range));
#else
	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
}

#endif	/* !_OPENSOLARIS_SYS_RANDOM_H_ */