/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
/*
* include / linux / random . h
*
* Include file for the random number generator .
*/
#ifndef _UAPI_LINUX_RANDOM_H
#define _UAPI_LINUX_RANDOM_H
#include <linux/types.h>
#include <linux/ioctl.h>
#include <linux/irqnr.h>
/* ioctl()'s for the random number generator */
/* Get the entropy count. */
#define RNDGETENTCNT _IOR( 'R' , 0 x00, int )
/* Add to (or subtract from) the entropy count. (Superuser only.) */
#define RNDADDTOENTCNT _IOW( 'R' , 0 x01, int )
/* Get the contents of the entropy pool. (Superuser only.) (Removed in 2.6.9-rc2.) */
#define RNDGETPOOL _IOR( 'R' , 0 x02, int [2 ] )
/*
* Write bytes into the entropy pool and add to the entropy count .
* ( Superuser only . )
*/
#define RNDADDENTROPY _IOW( 'R' , 0 x03, int [2 ] )
/* Clear entropy count to 0. (Superuser only.) */
#define RNDZAPENTCNT _IO( 'R' , 0 x04 )
/* Clear the entropy pool and associated counters. (Superuser only.) */
#define RNDCLEARPOOL _IO( 'R' , 0 x06 )
/* Reseed CRNG. (Superuser only.) */
#define RNDRESEEDCRNG _IO( 'R' , 0 x07 )
struct rand_pool_info {
int entropy_count;
int buf_size;
__u32 buf[];
};
/*
* Flags for getrandom ( 2 )
*
* GRND_NONBLOCK Don ' t block and return EAGAIN instead
* GRND_RANDOM No effect
* GRND_INSECURE Return non - cryptographic random bytes
*/
#define GRND_NONBLOCK 0 x0001
#define GRND_RANDOM 0 x0002
#define GRND_INSECURE 0 x0004
/**
* struct vgetrandom_opaque_params - arguments for allocating memory for vgetrandom
*
* @ size_per_opaque_state : Size of each state that is to be passed to vgetrandom ( ) .
* @ mmap_prot : Value of the prot argument in mmap ( 2 ) .
* @ mmap_flags : Value of the flags argument in mmap ( 2 ) .
* @ reserved : Reserved for future use .
*/
struct vgetrandom_opaque_params {
__u32 size_of_opaque_state;
__u32 mmap_prot;
__u32 mmap_flags;
__u32 reserved[13 ];
};
#endif /* _UAPI_LINUX_RANDOM_H */
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