RAND(3) BSD Programmer's Manual RAND(3)
rand, srand - bad random number generator
#include <stdlib.h> void srand(unsigned int seed); int rand(void); int 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 2015-07-19 22:36:15 by $MirOS: src/scripts/roff2htm,v 1.80 2015/01/02 13:54:19 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 Thorsten Glaser.
This manual page’s HTML representation is supposed to be valid XHTML/1.1; if not, please send a bug report – diffs preferred.