|RAND(3)||Library Functions Manual||RAND(3)|
— bad random number generator
rand() function computes a sequence of
pseudo-random integers in the range of 0 to
(as defined by the header file
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.
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.
srand() functions conform to ANSI
X3.159-1989 (“ANSI C89”).
rand_r() function conforms to
IEEE Std 1003.1-2008 (“POSIX.1”).
srand() first appeared in
Version 3 AT&T UNIX.
|January 21, 2014||OpenBSD-5.5|