| Simon Glass | ecd1f81 | 2019-11-14 12:57:13 -0700 | [diff] [blame] | 1 | /* SPDX-License-Identifier: GPL-2.0+ */ |
| 2 | /* |
| 3 | * (C) Copyright 2000-2009 |
| 4 | * Wolfgang Denk, DENX Software Engineering, wd@denx.de. |
| 5 | */ |
| 6 | |
| 7 | #ifndef __RAND_H |
| 8 | #define __RAND_H |
| 9 | |
| 10 | #define RAND_MAX -1U |
| 11 | |
| 12 | /** |
| 13 | * srand() - Set the random-number seed value |
| 14 | * |
| 15 | * This can be used to restart the pseudo-random-number sequence from a known |
| 16 | * point. This affects future calls to rand() to start from that point |
| 17 | * |
| 18 | * @seed: New seed |
| 19 | */ |
| 20 | void srand(unsigned int seed); |
| 21 | |
| 22 | /** |
| 23 | * rand() - Get a 32-bit pseudo-random number |
| 24 | * |
| 25 | * @returns next random number in the sequence |
| 26 | */ |
| 27 | unsigned int rand(void); |
| 28 | |
| 29 | /** |
| 30 | * rand_r() - Get a 32-bit pseudo-random number |
| 31 | * |
| 32 | * This version of the function allows multiple sequences to be used at the |
| 33 | * same time, since it requires the caller to store the seed value. |
| 34 | * |
| 35 | * @seed value to use, updated on exit |
| 36 | * @returns next random number in the sequence |
| 37 | */ |
| 38 | unsigned int rand_r(unsigned int *seedp); |
| 39 | |
| 40 | #endif |