/* 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 _UAPI_LINUX_RANDOM_H
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#define _UAPI_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 No effect
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* GRND_INSECURE Return non-cryptographic random bytes
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*/
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#define GRND_NONBLOCK 0x0001
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#define GRND_RANDOM 0x0002
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#define GRND_INSECURE 0x0004
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#endif /* _UAPI_LINUX_RANDOM_H */
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