Check in io.pxd

Change-Id: I2df54d0dc25457055011cd8a2b798fc28b1640d1

python/pyarrow/io.pxd

@@ -0,0 +1,32 @@
+# 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.
+
+# distutils: language = c++
+
+from pyarrow.includes.common cimport *
+from pyarrow.includes.libarrow cimport *
+from pyarrow.includes.libarrow_io cimport RandomAccessFile, WriteableFile
+
+
+cdef class NativeFileInterface:
+
+    # By implementing these "virtual" functions (all functions in Cython
+    # extension classes are technically virtual in the C++ sense)m we can
+    # expose the arrow::io abstract file interfaces to other components
+    # throughout the suite of Arrow C++ libraries
+    cdef read_handle(self, shared_ptr[RandomAccessFile]* file)
+    cdef write_handle(self, shared_ptr[WriteableFile]* file)