LXR linux/include/uapi/linux/random.h

   1/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
   2/*
   3 * include/linux/random.h
   4 *
   5 * Include file for the random number generator.
   6 */
   7
   8#ifndef _UAPI_LINUX_RANDOM_H
   9#define _UAPI_LINUX_RANDOM_H
  10
  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.) */
  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[0];
  45};
  46
  47/*
  48 * Flags for getrandom(2)
  49 *
  50 * GRND_NONBLOCK        Don't block and return EAGAIN instead
  51 * GRND_RANDOM          No effect
  52 * GRND_INSECURE        Return non-cryptographic random bytes
  53 */
  54#define GRND_NONBLOCK   0x0001
  55#define GRND_RANDOM     0x0002
  56#define GRND_INSECURE   0x0004
  57
  58#endif /* _UAPI_LINUX_RANDOM_H */
  59