RAND(3) BSD 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 re-
peatable 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 ini-
tialized 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.
MirOS BSD #10-current June 29, 1991 1