From e92d6ed5e7e5b5d4f1a2351eb96a4561bda3c002 Mon Sep 17 00:00:00 2001
From: Michael Graff <mgraff@isc.org>
Date: Fri, 16 Jun 2000 01:38:13 +0000
Subject: [PATCH] snapshot

---
 lib/isc/include/isc/entropy.h | 29 +++++++++++++++++++++++++++++
 lib/isc/unix/entropy.c        | 29 +++++++++++++++++++++++++++++
 2 files changed, 58 insertions(+)

diff --git a/lib/isc/include/isc/entropy.h b/lib/isc/include/isc/entropy.h
index e59254ca95..447b3b99c0 100644
--- a/lib/isc/include/isc/entropy.h
+++ b/lib/isc/include/isc/entropy.h
@@ -64,6 +64,19 @@
 
 ISC_LANG_BEGINDECLS
 
+/*
+ * Entropy callback function.
+ */
+typedef isc_result_t (*isc_entropystart_t)(isc_entropy_t *ent,
+					   isc_entropysource_t *source,
+					   void *arg);
+typedef isc_result_t (*isc_entropyget_t)(isc_entropy_t *ent,
+					 isc_entropysource_t *source,
+					 void *arg, unsigned int entropy);
+typedef void (*isc_entropystop_t)(isc_entropy_t *ent,
+				  isc_entropysource_t *source,
+				  void *arg);
+
 /***
  *** Flags.
  ***/
@@ -156,6 +169,22 @@ isc_entropy_createsamplesource(isc_entropy_t *ent,
  * to the source via isc_entropy_addsamples(), below.
  */
 
+isc_result_t
+isc_entropy_createcallbacksource(isc_entropy_t *ent,
+				 isc_entropystart_t start,
+				 isc_entropyget_t get,
+				 isc_entropystop_t stop,
+				 void *arg,
+				 isc_entropysource_t **sourcep);
+/*
+ * Create an entropy source that is polled via a callback.  This would
+ * be used when keyboard input is used, or a GUI input method.  It can
+ * also be used to hook in any external entropy source.
+ */
+
+void
+isc_entropy_resetcallbacksources(isc_entropy_t *ent);
+
 void
 isc_entropy_addsample(isc_entropysource_t *source, isc_uint32_t sample,
 		      isc_uint32_t extra);
diff --git a/lib/isc/unix/entropy.c b/lib/isc/unix/entropy.c
index 0ba1be4c7b..7adc3e5f03 100644
--- a/lib/isc/unix/entropy.c
+++ b/lib/isc/unix/entropy.c
@@ -98,6 +98,10 @@ typedef struct {
 	isc_uint32_t   *extra;		/* extra samples added in */
 } isc_entropysamplesource_t ;
 
+typedef struct {
+	isc_boolean_t	msg_printed;
+} isc_entropycallbacksource_t;
+
 typedef struct {
 	int		fd;		/* fd for the file, or -1 if closed */
 } isc_entropyfilesource_t;
@@ -118,6 +122,7 @@ struct isc_entropysource {
 
 #define ENTROPY_SOURCETYPE_SAMPLE	1	/* Type is a sample source */
 #define ENTROPY_SOURCETYPE_FILE		2	/* Type is a file source */
+#define ENTROPY_SOURCETYPE_CALLBACK	3	/* Type is a callback source */
 
 /*
  * The random pool "taps"
@@ -908,6 +913,30 @@ isc_entropy_destroysource(isc_entropysource_t **sourcep) {
 		destroy(&ent);
 }
 
+isc_result_t
+isc_entropy_createcallbacksource(isc_entropy_t *ent,
+				 isc_entropystart_t start,
+				 isc_entropyget_t get,
+				 isc_entropystop_t stop,
+				 void *arg,
+				 isc_entropysource_t **sourcep)
+{
+	REQUIRE(VALID_ENTROPY(ent));
+	REQUIRE(sourcep != NULL && *sourcep == NULL);
+
+	LOCK(&ent->lock);
+
+	ent->nsources++;
+
+	UNLOCK(&ent->lock);
+
+	return (ISC_R_NOTIMPLEMENTED);
+}
+
+void
+isc_entropy_resetcallbacksources(isc_entropy_t *ent) {
+}
+
 isc_result_t
 isc_entropy_createsamplesource(isc_entropy_t *ent,
 			       isc_entropysource_t **sourcep)