Github user jpeach commented on a diff in the pull request:
https://github.com/apache/trafficserver/pull/1233#discussion_r89939136
--- Diff: doc/developer-guide/api/functions/TSMgmtSourceGet.en.rst ---
@@ -0,0 +1,69 @@
+.. Licensed to the Apache Software Foundation (ASF) under one or more
+ contributor license agreements. See the NOTICE file distributed
+ with this work for additional information regarding copyright
+ ownership. The ASF licenses this file to you under the Apache
+ License, Version 2.0 (the "License"); you may not use this file
+ except in compliance with the License. You may obtain a copy of
+ the License at
+
+ http://www.apache.org/licenses/LICENSE-2.0
+
+ Unless required by applicable law or agreed to in writing, software
+ distributed under the License is distributed on an "AS IS" BASIS,
+ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+ implied. See the License for the specific language governing
+ permissions and limitations under the License.
+
+.. include:: ../../../common.defs
+
+.. default-domain:: c
+
+TSMgmtSourceGet
+***************
+
+Synopsis
+========
+
+`#include <ts/ts.h>`
+
+.. function:: TSReturnCode TSMgmtSourceGet(const char * var_name,
TSMgmtSource * result)
+
+Description
+===========
+
+Get the source of a value for a configuration variable. :arg:`var_name` is
the name of the variable
+as a nul terminated string. The source value is stored in :arg:`result`.
The function can return
+failure if :arg:`var_name` is not found.
+
+Types
+=====
+
+.. type:: TSMgmtSource
+
+ Source of the current value for a management (configuration) value.
+
+ .. macro:: TS_MGMT_SOURCE_NULL
--- End diff --
Why don't you just return this instead of `TS_ERROR`?
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