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 _UAPI_LINUX_RANDOM_H 9 #define _UAPI_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[0]; 45 }; 46 47 /* 48 * Flags for getrandom(2) 49 * 50 * GRND_NONBLOCK Don't block and return EAGAIN instead 51 * GRND_RANDOM Use the /dev/random pool instead of /dev/urandom 52 */ 53 #define GRND_NONBLOCK 0x0001 54 #define GRND_RANDOM 0x0002 55 56 #endif /* _UAPI_LINUX_RANDOM_H */ 57