[Midnightbsd-cvs] src [11860] trunk/share/examples/kld/random_adaptor: add random adapter

[laffer1 at midnightbsd.org]

Revision: 11860
          http://svnweb.midnightbsd.org/src/?rev=11860
Author:   laffer1
Date:     2018-07-13 09:29:37 -0400 (Fri, 13 Jul 2018)
Log Message:
-----------
add random adapter

Added Paths:
-----------
    trunk/share/examples/kld/random_adaptor/
    trunk/share/examples/kld/random_adaptor/Makefile
    trunk/share/examples/kld/random_adaptor/random_adaptor_example.c

Added: trunk/share/examples/kld/random_adaptor/Makefile
===================================================================
--- trunk/share/examples/kld/random_adaptor/Makefile	                        (rev 0)
+++ trunk/share/examples/kld/random_adaptor/Makefile	2018-07-13 13:29:37 UTC (rev 11860)
@@ -0,0 +1,7 @@
+# $MidnightBSD$
+# $FreeBSD: stable/10/share/examples/kld/random_adaptor/Makefile 254784 2013-08-24 13:54:56Z markm $
+
+KMOD=  random_adaptor_example
+SRCS=  ${KMOD}.c
+
+.include <bsd.kmod.mk>


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Added: trunk/share/examples/kld/random_adaptor/random_adaptor_example.c
===================================================================
--- trunk/share/examples/kld/random_adaptor/random_adaptor_example.c	                        (rev 0)
+++ trunk/share/examples/kld/random_adaptor/random_adaptor_example.c	2018-07-13 13:29:37 UTC (rev 11860)
@@ -0,0 +1,102 @@
+/* $MidnightBSD$ */
+/*-
+ * Copyright (c) 2013 Arthur Mesh <arthurmesh at 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: stable/10/share/examples/kld/random_adaptor/random_adaptor_example.c 256381 2013-10-12 15:31:36Z markm $");
+
+#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/live_entropy_sources.h>
+#include <dev/random/random_adaptors.h>
+#include <dev/random/randomdev.h>
+
+static int random_example_read(void *, int);
+
+struct random_adaptor random_example = {
+	.ident = "Example RNG",
+	.source = RANDOM_PURE_BOGUS,	/* Make sure this is in
+					 * sys/random.h and is unique */
+	.read = 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 int
+random_example_read(void *buf, 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);
+}
+
+static int
+random_example_modevent(module_t mod, int type, void *unused)
+{
+	int error = 0;
+
+	switch (type) {
+	case MOD_LOAD:
+		live_entropy_source_register(&random_example);
+		break;
+
+	case MOD_UNLOAD:
+		live_entropy_source_deregister(&random_example);
+		break;
+
+	case MOD_SHUTDOWN:
+		break;
+
+	default:
+		error = EOPNOTSUPP;
+		break;
+	}
+
+	return (error);
+}
+
+LIVE_ENTROPY_SRC_MODULE(live_entropy_source_example, random_example_modevent, 1);


Property changes on: trunk/share/examples/kld/random_adaptor/random_adaptor_example.c
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