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  * Return:	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  * @seedp:	seed value to use, updated on exit
36  * Return:	 next random number in the sequence
37  */
38 unsigned int rand_r(unsigned int *seedp);
39 
40 #endif
41