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Command: arc4random | Section: 9 | Source: OpenBSD | File: arc4random.9
ARC4RANDOM(9) FreeBSD Kernel Developer's Manual ARC4RANDOM(9)
NAME
arc4random, arc4random_buf, arc4random_uniform, enqueue_randomness -
kernel random subsystem
SYNOPSIS
#include <sys/systm.h>
u_int32_t
arc4random(void);
void
arc4random_buf(void *buf, size_t nbytes);
u_int32_t
arc4random_uniform(u_int32_t upper_bound);
void
enqueue_randomness(int);
DESCRIPTION
arc4random() and arc4random_buf() provide random numbers and are intended
to be called in any circumstance where random numbers are required.
arc4random_uniform() will return a uniformly distributed random number
less than upper_bound, avoiding "modulo bias" when the upper bound is not
a power of two. In the worst case, this function may consume multiple
iterations to ensure uniformity; see the source code to understand the
problem and solution.
enqueue_randomness() causes the supplied data argument to be added to the
entropy pool.
SEE ALSO
arc4random(3), random(4)
FreeBSD 14.1-RELEASE-p8 May 29, 2020 FreeBSD 14.1-RELEASE-p8