ISC BIND version 9.2.2rc1

1 files changed, 70 insertions, 0 deletions

diff --git a/usr.sbin/bind/lib/isc/random.c b/usr.sbin/bind/lib/isc/random.c
new file mode 100644
index 00000000000..e9b06c31913
--- /dev/null
+++ b/usr.sbin/bind/lib/isc/random.c
@@ -0,0 +1,70 @@
+/*
+ * Copyright (C) 1999-2001  Internet Software Consortium.
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM
+ * DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL
+ * INTERNET SOFTWARE CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT,
+ * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING
+ * FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
+ * NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
+ * WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+/* $ISC: random.c,v 1.15 2001/01/09 21:56:22 bwelling Exp $ */
+
+#include <config.h>
+
+#include <stdlib.h>
+#include <time.h>		/* Required for time(). */
+
+#include <isc/mutex.h>
+#include <isc/once.h>
+#include <isc/random.h>
+#include <isc/string.h>
+#include <isc/util.h>
+
+static isc_once_t once = ISC_ONCE_INIT;
+
+static void
+initialize_rand(void)
+{
+	srand(time(NULL));
+}
+
+static void
+initialize(void)
+{
+	RUNTIME_CHECK(isc_once_do(&once, initialize_rand) == ISC_R_SUCCESS);
+}
+
+void
+isc_random_seed(isc_uint32_t seed)
+{
+	initialize();
+
+	srand(seed);
+}
+
+void
+isc_random_get(isc_uint32_t *val)
+{
+	REQUIRE(val != NULL);
+
+	initialize();
+
+	*val = rand();
+}
+
+isc_uint32_t
+isc_random_jitter(isc_uint32_t max, isc_uint32_t jitter) {
+	REQUIRE(jitter < max);
+	if (jitter == 0)
+		return (max);
+	else
+		return (max - rand() % jitter);
+}