X-Git-Url: https://git.distorted.org.uk/u/mdw/catacomb/blobdiff_plain/099355bc239ba5c0c066be2924fbf0930744ee2f..025c5f4aa5ffbf8948482a4233318db81c2df5d2:/noise.h

diff --git a/noise.h b/noise.h
index b8a0050..0147c95 100644
--- a/noise.h
+++ b/noise.h
@@ -1,6 +1,6 @@
 /* -*-c-*-
  *
- * $Id: noise.h,v 1.3 1999/12/22 15:57:55 mdw Exp $
+ * $Id: noise.h,v 1.6 2004/04/08 01:36:15 mdw Exp $
  *
  * Acquisition of environmental noise (Unix-specific)
  *
@@ -27,20 +27,6 @@
  * MA 02111-1307, USA.
  */
 
-/*----- Revision history --------------------------------------------------* 
- *
- * $Log: noise.h,v $
- * Revision 1.3  1999/12/22 15:57:55  mdw
- * Label system-specific parts more clearly.
- *
- * Revision 1.2  1999/12/10 23:29:48  mdw
- * Change header file guard names.
- *
- * Revision 1.1  1999/09/03 08:41:12  mdw
- * Initial import.
- *
- */
-
 #ifndef CATACOMB_NOISE_H
 #define CATACOMB_NOISE_H
 
@@ -58,7 +44,7 @@
 
 /*----- Noise source definition -------------------------------------------*/
 
-extern rand_source noise_source;
+extern const rand_source noise_source;
 
 /*----- Magic numbers -----------------------------------------------------*/
 
@@ -133,6 +119,32 @@ extern void noise_setid(uid_t /*uid*/, gid_t /*gid*/);
 
 extern int noise_filter(rand_pool */*r*/, int /*good*/, const char */*c*/);
 
+/* --- @noise_freewheel@ --- *
+ *
+ * Arguments:	@rand_pool *r@ = pointer to a randomness pool
+ *
+ * Returns:	Nonzero if some randomness was contributed.
+ *
+ * Use:		Runs a free counter for a short while as a desparate attempt
+ *		to get randomness from somewhere.  This is actually quite
+ *		effective.
+ */
+
+int noise_freewheel(rand_pool */*r*/);
+
+/* --- @noise_enquire@ --- *
+ *
+ * Arguments:	@rand_pool *r@ = pointer to a randomness pool
+ *
+ * Returns:	Nonzero if some randomness was contributed.
+ *
+ * Use:		Runs some shell commands to enquire about the prevailing
+ *		environment.  This can gather quite a lot of low-quality
+ *		entropy.
+ */
+
+extern int noise_enquire(rand_pool */*r*/);
+
 /* --- @noise_acquire@ --- *
  *
  * Arguments:	@rand_pool *r@ = pointer to a randomness pool