1 files changed, 86 insertions, 0 deletions
diff --git a/lib/ns/lib.c b/lib/ns/lib.c
new file mode 100644
index 0000000..0c4a18f
--- /dev/null
+++ b/lib/ns/lib.c
@@ -0,0 +1,86 @@
+/*
+ * Copyright (C) Internet Systems Consortium, Inc. ("ISC")
+ *
+ * SPDX-License-Identifier: MPL-2.0
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0.  If a copy of the MPL was not distributed with this
+ * file, you can obtain one at https://mozilla.org/MPL/2.0/.
+ *
+ * See the COPYRIGHT file distributed with this work for additional
+ * information regarding copyright ownership.
+ */
+
+/*! \file */
+
+#include <stdbool.h>
+#include <stddef.h>
+
+#include <isc/mem.h>
+#include <isc/mutex.h>
+#include <isc/once.h>
+#include <isc/refcount.h>
+#include <isc/util.h>
+
+#include <dns/name.h>
+
+#include <ns/lib.h>
+
+/***
+ *** Globals
+ ***/
+
+LIBNS_EXTERNAL_DATA unsigned int ns_pps = 0U;
+
+/***
+ *** Private
+ ***/
+
+static isc_once_t init_once = ISC_ONCE_INIT;
+static isc_mem_t *ns_g_mctx = NULL;
+static bool initialize_done = false;
+static isc_refcount_t references;
+
+static void
+initialize(void) {
+	REQUIRE(!initialize_done);
+
+	isc_mem_create(&ns_g_mctx);
+
+	isc_refcount_init(&references, 0);
+	initialize_done = true;
+	return;
+}
+
+isc_result_t
+ns_lib_init(void) {
+	isc_result_t result;
+
+	/*
+	 * Since this routine is expected to be used by a normal application,
+	 * it should be better to return an error, instead of an emergency
+	 * abort, on any failure.
+	 */
+	result = isc_once_do(&init_once, initialize);
+	if (result != ISC_R_SUCCESS) {
+		return (result);
+	}
+
+	if (!initialize_done) {
+		return (ISC_R_FAILURE);
+	}
+
+	isc_refcount_increment0(&references);
+
+	return (ISC_R_SUCCESS);
+}
+
+void
+ns_lib_shutdown(void) {
+	if (isc_refcount_decrement(&references) == 1) {
+		isc_refcount_destroy(&references);
+		if (ns_g_mctx != NULL) {
+			isc_mem_detach(&ns_g_mctx);
+		}
+	}
+}