1/*
2 * include/linux/random.h
3 *
4 * Include file for the random number generator.
5 */
6
7#ifndef _UAPI_LINUX_RANDOM_H
8#define _UAPI_LINUX_RANDOM_H
9
10#include <linux/types.h>
11#include <linux/ioctl.h>
12#include <linux/irqnr.h>
13
14/* ioctl()'s for the random number generator */
15
16/* Get the entropy count. */
17#define RNDGETENTCNT	_IOR( 'R', 0x00, int )
18
19/* Add to (or subtract from) the entropy count.  (Superuser only.) */
20#define RNDADDTOENTCNT	_IOW( 'R', 0x01, int )
21
22/* Get the contents of the entropy pool.  (Superuser only.) */
23#define RNDGETPOOL	_IOR( 'R', 0x02, int [2] )
24
25/*
26 * Write bytes into the entropy pool and add to the entropy count.
27 * (Superuser only.)
28 */
29#define RNDADDENTROPY	_IOW( 'R', 0x03, int [2] )
30
31/* Clear entropy count to 0.  (Superuser only.) */
32#define RNDZAPENTCNT	_IO( 'R', 0x04 )
33
34/* Clear the entropy pool and associated counters.  (Superuser only.) */
35#define RNDCLEARPOOL	_IO( 'R', 0x06 )
36
37struct rand_pool_info {
38	int	entropy_count;
39	int	buf_size;
40	__u32	buf[0];
41};
42
43/*
44 * Flags for getrandom(2)
45 *
46 * GRND_NONBLOCK	Don't block and return EAGAIN instead
47 * GRND_RANDOM		Use the /dev/random pool instead of /dev/urandom
48 */
49#define GRND_NONBLOCK	0x0001
50#define GRND_RANDOM	0x0002
51
52#endif /* _UAPI_LINUX_RANDOM_H */
53