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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	13.0			 May 29, 2020			  FreeBSD 13.0

NAME | SYNOPSIS | DESCRIPTION | SEE ALSO

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