/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */

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/*

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* include/linux/random.h

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*

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* Include file for the random number generator.

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*/

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#ifndef _LINUX_RANDOM_H

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#define _LINUX_RANDOM_H

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#include <linux/types.h>

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#include <linux/ioctl.h>

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#include <linux/irqnr.h>

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/* ioctl()'s for the random number generator */

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/* Get the entropy count. */

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#define RNDGETENTCNT _IOR( 'R', 0x00, int )

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/* Add to (or subtract from) the entropy count. (Superuser only.) */

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#define RNDADDTOENTCNT _IOW( 'R', 0x01, int )

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/* Get the contents of the entropy pool. (Superuser only.) */

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#define RNDGETPOOL _IOR( 'R', 0x02, int [2] )

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/*

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* Write bytes into the entropy pool and add to the entropy count.

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* (Superuser only.)

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*/

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#define RNDADDENTROPY _IOW( 'R', 0x03, int [2] )

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/* Clear entropy count to 0. (Superuser only.) */

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#define RNDZAPENTCNT _IO( 'R', 0x04 )

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/* Clear the entropy pool and associated counters. (Superuser only.) */

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#define RNDCLEARPOOL _IO( 'R', 0x06 )

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/* Reseed CRNG. (Superuser only.) */

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#define RNDRESEEDCRNG _IO( 'R', 0x07 )

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struct rand_pool_info {

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int entropy_count;

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int buf_size;

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__u32 buf[0];

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};

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/*

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* Flags for getrandom(2)

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*

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* GRND_NONBLOCK Don't block and return EAGAIN instead

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* GRND_RANDOM Use the /dev/random pool instead of /dev/urandom

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*/

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#define GRND_NONBLOCK 0x0001

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#define GRND_RANDOM 0x0002

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#endif /* _LINUX_RANDOM_H */

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