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

   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