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 37 struct 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