RAND(3) OpenBSD Programmer's Manual RAND(3)NAME
rand, srand - bad random number generator
SYNOPSIS
#include <stdlib.h>
void
srand(unsigned int seed);
int
rand(void);
int
rand_r(unsigned int *seed);
DESCRIPTION
These interfaces are obsoleted by random(3).
The rand() function computes a sequence of pseudo-random integers in the
range of 0 to RAND_MAX (as defined by the header file <stdlib.h>).
The srand() function sets its argument 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 seed value is provided, the functions are automatically seeded with
a value of 1.
The rand_r() is a thread-safe version of rand(). Storage for the seed
must be provided through the seed argument, and needs to have been
initialized by the caller.
SEE ALSOarc4random(3), rand48(3), random(3)STANDARDS
The rand() and srand() functions conform to ANSI X3.159-1989 (``ANSI
C'').
The rand_r() function conforms to ISO/IEC 9945-1 ANSI/IEEE (``POSIX'')
Std 1003.1c Draft 10.
OpenBSD 4.9 May 31, 2007 OpenBSD 4.9
