1 files changed, 119 insertions, 0 deletions
diff --git a/sys/dev/random/pseudo_rng.c b/sys/dev/random/pseudo_rng.c
new file mode 100644
index 000000000000..13552942f795
--- /dev/null
+++ b/sys/dev/random/pseudo_rng.c
@@ -0,0 +1,119 @@
+/*-
+ * 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/time.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>
+
+static struct mtx	pseudo_random_block_mtx;
+
+static int
+pseudo_random_block_read(void *buf __unused, int c __unused)
+{
+
+	mtx_lock(&pseudo_random_block_mtx);
+
+	printf("random(4) device is blocking.\n");
+	msleep(pseudo_random_block_read, &pseudo_random_block_mtx, 0,
+	    "block", 0);
+
+	mtx_unlock(&pseudo_random_block_mtx);
+
+	return (0);
+}
+
+static void
+pseudo_random_block_init(void)
+{
+
+	mtx_init(&pseudo_random_block_mtx, "sleep mtx for random_block",
+	    NULL, MTX_DEF);
+}
+
+static void
+pseudo_random_block_deinit(void)
+{
+
+	mtx_destroy(&pseudo_random_block_mtx);
+}
+
+struct random_adaptor pseudo_random_block = {
+	.ident = "pseudo-RNG that always blocks",
+	.init = pseudo_random_block_init,
+	.deinit = pseudo_random_block_deinit,
+	.read = pseudo_random_block_read,
+	.write = (random_write_func_t *)random_null_func,
+	.reseed = (random_reseed_func_t *)random_null_func,
+	.seeded = 1,
+};
+
+static int
+pseudo_random_panic_read(void *buf, int c)
+{
+
+	panic("Insert a witty panic msg in here.");
+
+	return (0);
+}
+
+struct random_adaptor pseudo_random_panic = {
+	.ident = "pseudo-RNG that always panics on first read(2)",
+	.init = (random_init_func_t *)random_null_func,
+	.deinit = (random_deinit_func_t *)random_null_func,
+	.read = pseudo_random_panic_read,
+	.write = (random_write_func_t *)random_null_func,
+	.reseed = (random_reseed_func_t *)random_null_func,
+	.seeded = 1,
+};
+
+static int
+pseudo_random_modevent(module_t mod, int type, void *unused)
+{
+
+	switch (type) {
+	case MOD_LOAD:
+		random_adaptor_register("block", &pseudo_random_block);
+		EVENTHANDLER_INVOKE(random_adaptor_attach,
+		    &pseudo_random_block);
+
+		random_adaptor_register("panic", &pseudo_random_panic);
+
+		return (0);
+	}
+
+	return (EINVAL);
+}
+
+RANDOM_ADAPTOR_MODULE(pseudo, pseudo_random_modevent, 1);