random_number.c

/* random_number.c:
 * Generates a fairly better random number than rand()
 * This function grabs x bytes from /dev/urandom 
 * and converts it to a long long int.
 */
#include <unistd.h>
#include <fcntl.h>
#include <stdlib.h>
#include <stdio.h>

unsigned long long int
random_number()
{
  int fd = open("/dev/random",O_RDONLY);
  unsigned long long int buf;
  read(fd,&buf,sizeof(buf)); /* Reads necessary bytes for an unsigned
				long long int */
  return buf;
}

int
main(void)
{
  printf("%llu\n",random_number());
  return 0;
}