+/*
+ * Open a random device if required and return its file descriptor or -1 on error
+ */
+static int get_random_device(size_t n)
+{
+ struct stat st;
+ struct random_device * rd = &random_devices[n];
+
+ /* reuse existing file descriptor if it is (still) valid */
+ if (check_random_device(rd))
+ return rd->fd;
+
+ /* open the random device ... */
+ if ((rd->fd = open(random_device_paths[n], O_RDONLY)) == -1)
+ return rd->fd;
+
+ /* ... and cache its relevant stat(2) data */
+ if (fstat(rd->fd, &st) != -1) {
+ rd->dev = st.st_dev;
+ rd->ino = st.st_ino;
+ rd->mode = st.st_mode;
+ rd->rdev = st.st_rdev;
+ } else {
+ close(rd->fd);
+ rd->fd = -1;
+ }
+
+ return rd->fd;
+}
+
+/*
+ * Close a random device making sure it is a random device
+ */
+static void close_random_device(size_t n)
+{
+ struct random_device * rd = &random_devices[n];
+
+ if (check_random_device(rd))
+ close(rd->fd);
+ rd->fd = -1;
+}
+
+int rand_pool_init(void)
+{
+ size_t i;
+
+ for (i = 0; i < OSSL_NELEM(random_devices); i++)
+ random_devices[i].fd = -1;
+
+ return 1;