random.h

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/*
 * 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];
};

struct rnd_state {
    __u32 s1, s2, s3;
};

/* Exported functions */


#endif /* _UAPI_LINUX_RANDOM_H */