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RAND(3) BSD Library Functions Manual RAND(3) NAME rand, srand, sranddev, rand_r -- bad random number generator LIBRARY Standard C Library (libc, -lc) SYNOPSIS #include <stdlib.h> void srand(unsigned seed); void sranddev(void); int rand(void); int rand_r(unsigned *ctx); 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 seed as the seed for a new se- quence of pseudo-random numbers to be returned by rand(). These se- quences 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, suitable for crypto- graphic use. The rand_r() function provides the same functionality as rand(). A pointer to the context value ctx must be supplied by the caller. SEE ALSO 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
NAME | LIBRARY | SYNOPSIS | DESCRIPTION | SEE ALSO | STANDARDS
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