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RNDCONTROL(8)		FreeBSD	System Manager's Manual		 RNDCONTROL(8)

NAME
     rndcontrol	-- a utility for manipulating the /dev/random device

SYNOPSIS
     rndcontrol	[-q] [-s irq_no] [-c irq_no]

DESCRIPTION
     The rndcontrol command is used to set which interrupts are	used to	help
     randomise the ``pool of entropy'' maintained by the kernel.  The
     /dev/random and /dev/urandom devices are the user interface to this
     source of randomness.  Any	changes	take effect immediately.

     The following command line	options	are supported:

     -q	     Turn off all output except	errors.

     -s	n    Allow IRQ n to be used as a source	of randomness.	This option
	     may be repeated for more than one IRQ.

     -c	n    Stop IRQ n	from being used	as a source of randomness.  This
	     option may	be repeated for	more than one IRQ.

     The default is to have no IRQ's being used.

FILES
     /dev/random   secure random device
     /dev/urandom  random device

BUGS
     Sure to be	some.

SEE ALSO
     random(4)

AUTHORS
     Theodore Ts'o wrote the core code.	 Mark Murray ported this code to
     FreeBSD and wrote the support routines and	constructed the	man pages.

HISTORY
     The rndcontrol utility first appeared in FreeBSD 2.1.5.

FreeBSD	10.1		       October 20, 1995			  FreeBSD 10.1

NAME | SYNOPSIS | DESCRIPTION | FILES | BUGS | SEE ALSO | AUTHORS | HISTORY

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