MirOS Manual: rand(3), rand_r(3), srand(3)

RAND(3)                    BSD Programmer's Manual                     RAND(3)


     rand, srand - bad random number generator


     #include <stdlib.h>

     srand(unsigned int seed);


     rand_r(unsigned int *seed);


     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.


     arc4random(3), rand48(3), random(3)


     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

Generated on 2015-10-25 00:47:46 by $MirOS: src/scripts/roff2htm,v 1.81 2015/10/16 13:19:09 tg Exp $

These manual pages and other documentation are copyrighted by their respective writers; their source is available at our CVSweb, AnonCVS, and other mirrors. The rest is Copyright © 2002–2015 The MirOS Project, Germany.
This product includes material provided by mirabilos.

This manual page’s HTML representation is supposed to be valid XHTML/1.1; if not, please send a bug report – diffs preferred.