$NetBSD: patch-src_mongo_platform_stack__locator__dragonfly.cpp,v 1.1 2016/02/12 03:37:24 ryoon Exp $

--- src/mongo/platform/stack_locator_dragonfly.cpp.orig	2016-02-11 11:27:13.489023328 +0000
+++ src/mongo/platform/stack_locator_dragonfly.cpp
@@ -0,0 +1,58 @@
+/**
+ *    Copyright (C) 2015 MongoDB Inc.
+ *
+ *    This program is free software: you can redistribute it and/or  modify
+ *    it under the terms of the GNU Affero General Public License, version 3,
+ *    as published by the Free Software Foundation.
+ *
+ *    This program is distributed in the hope that it will be useful,
+ *    but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *    GNU Affero General Public License for more details.
+ *
+ *    You should have received a copy of the GNU Affero General Public License
+ *    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ *    As a special exception, the copyright holders give permission to link the
+ *    code of portions of this program with the OpenSSL library under certain
+ *    conditions as described in each individual source file and distribute
+ *    linked combinations including the program with the OpenSSL library. You
+ *    must comply with the GNU Affero General Public License in all respects for
+ *    all of the code used other than as permitted herein. If you modify file(s)
+ *    with this exception, you may extend this exception to your version of the
+ *    file(s), but you are not obligated to do so. If you do not wish to do so,
+ *    delete this exception statement from your version. If you delete this
+ *    exception statement from all source files in the program, then also delete
+ *    it in the license file.
+ */
+
+#include "mongo/platform/basic.h"
+
+#include "mongo/platform/stack_locator.h"
+
+#include <pthread.h>
+#include <pthread_np.h>
+
+#include "mongo/util/assert_util.h"
+#include "mongo/util/scopeguard.h"
+
+namespace mongo {
+
+StackLocator::StackLocator() {
+    pthread_attr_t attr;
+    size_t size;
+
+    pthread_t self = pthread_self();
+
+    invariant(pthread_attr_init(&attr) == 0);
+    ON_BLOCK_EXIT(pthread_attr_destroy, &attr);
+
+    invariant(pthread_attr_get_np(self, &attr) == 0);
+
+    invariant(pthread_attr_getstack(&attr, &_end, &size) == 0);
+
+    // TODO: Assumes stack grows downward on FreeBSD
+    _begin = static_cast<char*>(_end) + size;
+}
+
+}  // namespace mongo