srand(3) [netbsd man page]

RAND(3) 						   BSD Library Functions Manual 						   RAND(3)

NAME

     rand, srand, rand_r -- bad random number generator

LIBRARY

     Standard C Library (libc, -lc)

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 rand() function is automatically seeded with a value of 1.

     The rand_r() function is a reentrant interface to rand(); the seed has to be supplied and is maintained by the caller.

SEE ALSO

     random(3), rnd(4)

STANDARDS

     The rand() and srand() functions conform to ANSI X3.159-1989 (``ANSI C89'').  The rand_r() function conforms to IEEE Std 1003.1c-1995
     (``POSIX.1'').

BSD
								   June 4, 1993 							       BSD

RAND(3) 						   BSD Library Functions Manual 						   RAND(3)

NAME

     rand, rand_r, srand, sranddev -- bad random number generator

LIBRARY

     Standard C Library (libc, -lc)

SYNOPSIS

     #include <stdlib.h>

     int
     rand(void);

     int
     rand_r(unsigned *seed);

     void
     srand(unsigned seed);

     void
     sranddev(void);

DESCRIPTION

     These interfaces are obsoleted by arc4random(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 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 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 seed must be supplied by the caller.

SEE ALSO

     arc4random(3), random(3), random(4)

STANDARDS

     The rand() and srand() functions conform to ISO/IEC 9899:1990 (``ISO C90'').

     The rand_r() function is as proposed in the POSIX.4a Draft #6 document.

BSD
								   May 25, 1999 							       BSD