Why is rand() not so random after fork?

Question

#include 
#include 
#include 
#include 

int main() {
    int i =10;
    /* initialize random seed:  */
         


        

Answer 1

You're not reseeding when you make a child process. The state of the random number generator is exactly the same.

Even if you seed again in your child, you're seeding with the time with a +/- 1 second granularity. When you fork, it all happens in less than a second.

Try seeding it with something different and more random.