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/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
/*
* include/linux/random.h
*
* Include file for the random number generator.
*/
#ifndef _LINUX_RANDOM_H
#define _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', 0x00, int)
/* Add to (or subtract from) the entropy count. (Superuser only.) */
#define RNDADDTOENTCNT _IOW('R', 0x01, int)
/* Get the contents of the entropy pool. (Superuser only.) (Removed
* in 2.6.9-rc2.) */
#define RNDGETPOOL _IOR('R', 0x02, int[2])
/*
* Write bytes into the entropy pool and add to the entropy count.
* (Superuser only.)
*/
#define RNDADDENTROPY _IOW('R', 0x03, int[2])
/* Clear entropy count to 0. (Superuser only.) */
#define RNDZAPENTCNT _IO('R', 0x04)
/* Clear the entropy pool and associated counters. (Superuser only.) */
#define RNDCLEARPOOL _IO('R', 0x06)
/* Reseed CRNG. (Superuser only.) */
#define RNDRESEEDCRNG _IO('R', 0x07)
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 0x0001
#define GRND_RANDOM 0x0002
#define GRND_INSECURE 0x0004
/**
* 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 /* _LINUX_RANDOM_H */
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