A couple of experiments actually ran into limitations due to the limit
of the PRNG.
#include "sn_random.h"
static pthread_mutex_t lock = PTHREAD_MUTEX_INITIALIZER;
#include "sn_random.h"
static pthread_mutex_t lock = PTHREAD_MUTEX_INITIALIZER;
-static unsigned int seed;
+static unsigned int seed0;
+static unsigned int seed1;
static int have_init = 0;
static int read_dev_random (void *buffer, size_t buffer_size)
static int have_init = 0;
static int read_dev_random (void *buffer, size_t buffer_size)
char *buffer_position;
size_t yet_to_read;
char *buffer_position;
size_t yet_to_read;
- fd = open ("/dev/random", O_RDONLY);
+ fd = open ("/dev/urandom", O_RDONLY);
if (fd < 0)
{
perror ("open");
if (fd < 0)
{
perror ("open");
static void do_init (void)
{
static void do_init (void)
{
+ if (have_init)
+ return;
- status = read_dev_random (&seed, sizeof (seed));
- if (status == 0)
- have_init = 1;
+ read_dev_random (&seed0, sizeof (seed0));
+ read_dev_random (&seed1, sizeof (seed1));
+ have_init = 1;
+int sn_random_init (void)
+{
+ have_init = 0;
+ do_init ();
+
+ return (0);
+}
+
pthread_mutex_lock (&lock);
pthread_mutex_lock (&lock);
- if (have_init == 0)
- do_init ();
+ r0 = rand_r (&seed0);
+ r1 = rand_r (&seed1);
pthread_mutex_unlock (&lock);
pthread_mutex_unlock (&lock);
} /* int sn_random */
int sn_true_random (void)
} /* int sn_random */
int sn_true_random (void)
#ifndef SN_RANDOM_H
#define SN_RANDOM_H 1
#ifndef SN_RANDOM_H
#define SN_RANDOM_H 1
+int sn_random_init (void);
+
int sn_random (void);
int sn_true_random (void);
int sn_random (void);
int sn_true_random (void);