+/**
+ * Process ID of the "find" process that we use for
+ * entropy gathering.
+ */
+static struct GNUNET_OS_Process *genproc;
+
+
+/**
+ * Function called by libgcrypt whenever we are
+ * blocked gathering entropy.
+ */
+static void
+entropy_generator (void *cls, const char *what, int printchar, int current,
+ int total)
+{
+ unsigned long code;
+ enum GNUNET_OS_ProcessStatusType type;
+ int ret;
+
+ if (0 != strcmp (what, "need_entropy"))
+ return;
+ if (current == total)
+ {
+ if (genproc != NULL)
+ {
+ if (0 != GNUNET_OS_process_kill (genproc, SIGTERM))
+ LOG_STRERROR (GNUNET_ERROR_TYPE_ERROR, "kill");
+ GNUNET_break (GNUNET_OK == GNUNET_OS_process_wait (genproc));
+ GNUNET_OS_process_destroy (genproc);
+ genproc = NULL;
+ }
+ return;
+ }
+ if (genproc != NULL)
+ {
+ ret = GNUNET_OS_process_status (genproc, &type, &code);
+ if (ret == GNUNET_NO)
+ return; /* still running */
+ if (ret == GNUNET_SYSERR)
+ {
+ GNUNET_break (0);
+ return;
+ }
+ if (0 != GNUNET_OS_process_kill (genproc, SIGTERM))
+ LOG_STRERROR (GNUNET_ERROR_TYPE_ERROR, "kill");
+ GNUNET_break (GNUNET_OK == GNUNET_OS_process_wait (genproc));
+ GNUNET_OS_process_destroy (genproc);
+ genproc = NULL;
+ }
+ LOG (GNUNET_ERROR_TYPE_INFO, _("Starting `%s' process to generate entropy\n"),
+ "find");
+ genproc =
+ GNUNET_OS_start_process (GNUNET_NO, 0,
+ NULL, NULL, "sh", "sh", "-c",
+ "exec find / -mount -type f -exec cp {} /dev/null \\; 2>/dev/null",
+ NULL);
+}
+
+
+static void
+killfind ()
+{
+ if (genproc != NULL)
+ {
+ GNUNET_OS_process_kill (genproc, SIGKILL);
+ GNUNET_OS_process_destroy (genproc);
+ genproc = NULL;
+ }
+}
+
+
+void __attribute__ ((constructor)) GNUNET_CRYPTO_random_init ()
+{
+ gcry_control (GCRYCTL_DISABLE_SECMEM, 0);
+ if (!gcry_check_version (NEED_LIBGCRYPT_VERSION))
+ {
+ FPRINTF (stderr,
+ _
+ ("libgcrypt has not the expected version (version %s is required).\n"),
+ NEED_LIBGCRYPT_VERSION);
+ GNUNET_abort ();
+ }
+#ifdef GCRYCTL_INITIALIZATION_FINISHED
+ gcry_control (GCRYCTL_INITIALIZATION_FINISHED, 0);
+#endif
+#ifdef gcry_fast_random_poll
+ gcry_fast_random_poll ();
+#endif
+ gcry_set_progress_handler (&entropy_generator, NULL);
+ atexit (&killfind);
+ GNUNET_CRYPTO_seed_weak_random (time (NULL) ^
+ GNUNET_CRYPTO_random_u32
+ (GNUNET_CRYPTO_QUALITY_NONCE, UINT32_MAX));
+}
+
+
+void __attribute__ ((destructor)) GNUNET_CRYPTO_random_fini ()
+{
+ gcry_set_progress_handler (NULL, NULL);
+}
+
+
+