1 files changed, 94 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
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--- /dev/null
+++ b/share/examples/kld/random_adaptor/random_adaptor_example.c
@@ -0,0 +1,94 @@
+/*-
+ * 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/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/param.h>
+#include <sys/kernel.h>
+#include <sys/module.h>
+#include <sys/selinfo.h>
+#include <sys/systm.h>
+
+#include <dev/random/random_adaptors.h>
+#include <dev/random/randomdev.h>
+
+#define RNG_NAME "example"
+
+static int random_example_read(void *, int);
+
+struct random_adaptor random_example = {
+	.ident = "Example RNG",
+	.init = (random_init_func_t *)random_null_func,
+	.deinit = (random_deinit_func_t *)random_null_func,
+	.read = random_example_read,
+	.write = (random_write_func_t *)random_null_func,
+	.reseed = (random_reseed_func_t *)random_null_func,
+	.seeded = 1,
+};
+
+/*
+ * Used under the license provided @ http://xkcd.com/221/
+ * http://creativecommons.org/licenses/by-nc/2.5/
+ */
+static u_char
+getRandomNumber(void)
+{
+	return 4;   /* chosen by fair dice roll, guaranteed to be random */
+}
+
+static int
+random_example_read(void *buf, int c)
+{
+	u_char *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);
+}
+
+static int
+random_example_modevent(module_t mod, int type, void *unused)
+{
+
+	switch (type) {
+	case MOD_LOAD:
+		random_adaptor_register(RNG_NAME, &random_example);
+		EVENTHANDLER_INVOKE(random_adaptor_attach, &random_example);
+		return (0);
+	}
+
+	return (EINVAL);
+}
+
+RANDOM_ADAPTOR_MODULE(random_example, random_example_modevent, 1);