/*
   * include/linux/random.h
   *
   * Include file for the random number generator.
   */
  
  #ifndef _UAPI_LINUX_RANDOM_H
  #define _UAPI_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.) */
  #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 )
  
  struct rand_pool_info {
  	int	entropy_count;
  	int	buf_size;
  	__u32	buf[0];
  };
  
  #endif /* _UAPI_LINUX_RANDOM_H */