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1/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */2/*3 * include/linux/random.h4 *5 * Include file for the random number generator.6 */7 8#ifndef _UAPI_LINUX_RANDOM_H9#define _UAPI_LINUX_RANDOM_H10 11#include <linux/types.h>12#include <linux/ioctl.h>13#include <linux/irqnr.h>14 15/* ioctl()'s for the random number generator */16 17/* Get the entropy count. */18#define RNDGETENTCNT _IOR( 'R', 0x00, int )19 20/* Add to (or subtract from) the entropy count. (Superuser only.) */21#define RNDADDTOENTCNT _IOW( 'R', 0x01, int )22 23/* Get the contents of the entropy pool. (Superuser only.) (Removed in 2.6.9-rc2.) */24#define RNDGETPOOL _IOR( 'R', 0x02, int [2] )25 26/* 27 * Write bytes into the entropy pool and add to the entropy count.28 * (Superuser only.)29 */30#define RNDADDENTROPY _IOW( 'R', 0x03, int [2] )31 32/* Clear entropy count to 0. (Superuser only.) */33#define RNDZAPENTCNT _IO( 'R', 0x04 )34 35/* Clear the entropy pool and associated counters. (Superuser only.) */36#define RNDCLEARPOOL _IO( 'R', 0x06 )37 38/* Reseed CRNG. (Superuser only.) */39#define RNDRESEEDCRNG _IO( 'R', 0x07 )40 41struct rand_pool_info {42 int entropy_count;43 int buf_size;44 __u32 buf[];45};46 47/*48 * Flags for getrandom(2)49 *50 * GRND_NONBLOCK Don't block and return EAGAIN instead51 * GRND_RANDOM No effect52 * GRND_INSECURE Return non-cryptographic random bytes53 */54#define GRND_NONBLOCK 0x000155#define GRND_RANDOM 0x000256#define GRND_INSECURE 0x000457 58/**59 * struct vgetrandom_opaque_params - arguments for allocating memory for vgetrandom60 *61 * @size_per_opaque_state: Size of each state that is to be passed to vgetrandom().62 * @mmap_prot: Value of the prot argument in mmap(2).63 * @mmap_flags: Value of the flags argument in mmap(2).64 * @reserved: Reserved for future use.65 */66struct vgetrandom_opaque_params {67 __u32 size_of_opaque_state;68 __u32 mmap_prot;69 __u32 mmap_flags;70 __u32 reserved[13];71};72 73#endif /* _UAPI_LINUX_RANDOM_H */74