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diff --git a/include/apr_support.h b/include/apr_support.h
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+++ b/include/apr_support.h
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+/* 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.
+ */
+
+#ifndef APR_SUPPORT_H
+#define APR_SUPPORT_H
+
+/**
+ * @file apr_support.h
+ * @brief APR Support functions
+ */
+
+#include "apr.h"
+#include "apr_network_io.h"
+#include "apr_file_io.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+
+/**
+ * @defgroup apr_support Internal APR support functions
+ * @ingroup APR 
+ * @{
+ */
+
+/**
+ * Wait for IO to occur or timeout.
+ *
+ * @param f The file to wait on.
+ * @param s The socket to wait on if @a f is @c NULL.
+ * @param for_read If non-zero wait for data to be available to read,
+ *        otherwise wait for data to be able to be written. 
+ * @return APR_TIMEUP if we run out of time.
+ */
+apr_status_t apr_wait_for_io_or_timeout(apr_file_t *f, apr_socket_t *s,
+                                        int for_read);
+
+/** @} */
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif  /* ! APR_SUPPORT_H */