rand, rand_r

Computes a sequence of pseudo-random integers in the range 0 to RAN_MAX (32767)

Local Servers:nonblocking
Remote Servers:N/A
Classification:ANSI
Platform:NLM
Service:Mathematical Computation

Syntax

  #include <stdlib.h> 
    
  int rand  (void);
  
  #include <stdlib.h> 
    
  int rand_r  (  
     unsigned long   *seed);

Parameters

seed
(IN/OUT) Points to a seed value (updated with each iteration).

Return Values

If the seed parameter is set to NULL, -1 is returned and errno is set to EINVAL.

If the value parameter is set to NULL, a value is returned but the value is not stored.

Remarks

rand_r is the same as rand except that the caller passes storage for the seed and the result rather than relying on a global variable (which has the potential of being modified by subsequent calls to rand by other threads in the same NLM).

rand_r is supported only in CLIB V 4.11 or above.

The sequence of pseudo-random integers can be started at different values by calling the srand function.

See Also

srand