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
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