1 files changed, 124 insertions, 0 deletions
diff --git a/share/examples/kld/random_adaptor/random_adaptor_example.c b/share/examples/kld/random_adaptor/random_adaptor_example.c
new file mode 100644
index 000000000000..6dd3321d1286
--- /dev/null
+++ b/share/examples/kld/random_adaptor/random_adaptor_example.c
@@ -0,0 +1,124 @@
+/*-
+ * SPDX-License-Identifier: BSD-2-Clause
+ *
+ * Copyright (c) 2013 Arthur Mesh <arthurmesh@gmail.com>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer
+ *    in this position and unchanged.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#include <sys/param.h>
+#include <sys/kernel.h>
+#include <sys/lock.h>
+#include <sys/module.h>
+#include <sys/random.h>
+#include <sys/systm.h>
+
+#include <dev/random/randomdev.h>
+#include <dev/random/randomdev_soft.h>
+#include <dev/random/random_adaptors.h>
+#include <dev/random/live_entropy_sources.h>
+
+static void live_random_example_init(void);
+static void live_random_example_deinit(void);
+static u_int live_random_example_read(void *, u_int);
+
+struct random_adaptor live_random_example = {
+	.les_ident = "Example RNG",
+	.les_source = RANDOM_PURE_BOGUS, /* Make sure this is in
+					  * sys/random.h and is unique */
+	.les_read = live_random_example_read,
+};
+
+/*
+ * Used under the license provided @ http://xkcd.com/221/
+ * http://creativecommons.org/licenses/by-nc/2.5/
+ */
+static uint8_t
+getRandomNumber(void)
+{
+	return 4;   /* chosen by fair dice roll, guaranteed to be random */
+}
+
+static void
+live_random_example_init(void)
+{
+
+	/* Do initialisation stuff here */
+}
+
+static void
+live_random_example_deinit(void)
+{
+
+	/* Do de-initialisation stuff here */
+}
+
+/* get <c> bytes of random stuff into <buf>. You may presume
+ * that <c> is a multiple of 2^n, with n>=3. A typical value
+ * is c=16.
+ */
+static u_int
+live_random_example_read(void *buf, u_int c)
+{
+	uint8_t *b;
+	int count;
+
+	b = buf;
+
+	for (count = 0; count < c; count++)
+		b[count] = getRandomNumber();
+
+	/* printf("returning %d bytes of pure randomness\n", c); */
+	return (c);
+}
+
+/* ARGSUSED */
+static int
+live_random_example_modevent(module_t mod __unused, int type, void *unused __unused)
+{
+	int error = 0;
+
+	switch (type) {
+	case MOD_LOAD:
+		live_entropy_source_register(&live_random_example);
+		break;
+
+	case MOD_UNLOAD:
+		live_entropy_source_deregister(&live_random_example);
+		break;
+
+	case MOD_SHUTDOWN:
+		break;
+
+	default:
+		error = EOPNOTSUPP;
+		break;
+	}
+
+	return (error);
+}
+
+DEV_MODULE(live_random_example, live_random_example_modevent, NULL);
+MODULE_VERSION(live_random_example, 1);
+MODULE_DEPEND(live_random_example, randomdev, 1, 1, 1);