include/rand.h

   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