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srand (3)

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srand (3) ( Русские man: Библиотечные вызовы )

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BSD mandoc

NAME



rand

 
srand

 
sranddev

 
rand_r

 - bad random number generator

LIBRARY

Lb libc

SYNOPSIS

#include <stdlib.h>
void srand (unsigned seed);
void sranddev (void);
int rand (void);
int rand_r (unsigned *ctx);

DESCRIPTION

Bf -symbolic These interfaces are obsoleted by random(3). Ef

The rand ();
function computes a sequence of pseudo-random integers in the range of 0 to RAND_MAX (as defined by the header file In stdlib.h ) .

The srand ();
function sets its argument Fa seed as the seed for a new sequence of pseudo-random numbers to be returned by rand (.);
These sequences are repeatable by calling srand ();
with the same seed value.

If no Fa seed value is provided, the functions are automatically seeded with a value of 1.

The sranddev ();
function initializes a seed using the random(4) random number device which returns good random numbers. However, the rand ();
function still remains unsuitable for cryptographic use.

The rand_r ();
function provides the same functionality as rand (.);
A pointer to the context value Fa ctx must be supplied by the caller.