Getting truley random in C Options

[Valirian_Oak]

Pseudo random, I am not

CODE

int ssrand(int min, int max) {       //This creates a function called ssrand(min, max) which generates a random int between min and max
        FILE* f;
        unsigned q;
        float randmax=65536;
        float x;
        f=fopen("/dev/urandom", "r");
        fread(&q, 1, 4, f);
        randmax *= randmax;
        x = q / randmax;
        x = x * (max-min);
        x= x + min;
        fclose(f);
        return x;
}

I needed to write this for a phone line tester, i figured someone will eventualy need it.

This function will read for the urandom device and return a truly random int between MIN and MAX from your computers "entropy pool". The data from urandom is truly random because it is calculated using the disorderin mouse movements and keystrokes. To see this open a terminal and type

CODE

cat /dev/random

This will dump the current entropy pool to the screen.
Now type

CODE

cat /dev/urandom

That will dump the current entropy pool and automaticly [and mst importantly, randomly] create more.