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       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 _LINUX_RANDOM_H
       9  #define _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  
      41  struct 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 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 /* _LINUX_RANDOM_H */