#include <stdio.h>
#include <stdlib.h>

unsigned long rng_get_seed(void)
{
  FILE *fp=NULL;
  unsigned long seed;
  size_t nread;
  const size_t one=1;
  const char fname[]="/dev/random";
  fp = fopen(fname,"r");
  if(fp==NULL) {
	fprintf(stderr,"ERROR: Couldn't open `%s' ..exiting\n",fname);
	exit(EXIT_FAILURE);
  }
  nread = fread(&seed,sizeof(seed),one,fp);
  fclose(fp);
  if(nread != 1){
	fprintf(stderr,"ERROR: Couldn't read %zu bytes from the `%s'..exiting\n",sizeof(seed),fname);
	exit(EXIT_FAILURE);
  }
  return seed;
}