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diff --git a/src/inode2filename/out_of_process_inode_resolver.h b/src/inode2filename/out_of_process_inode_resolver.h
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+// Copyright (C) 2020 The Android Open Source Project
+//
+// Licensed 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 IORAP_SRC_INODE2FILENAME_OUT_OF_PROCESS_INDOE_RESOLVER_H_
+#define IORAP_SRC_INODE2FILENAME_OUT_OF_PROCESS_INDOE_RESOLVER_H_
+
+#include "common/expected.h"
+#include "inode2filename/inode_resolver.h"
+
+namespace iorap::inode2filename {
+
+// Create an InodeResolver that fork+exec+pipes into the binary 'iorap.inode2filename'
+// and transmits the results back via an IPC mechanism.
+//
+// This is instantiated by InodeResolver::Create + ProcessMode::kOutOfProcessIpc
+class OutOfProcessInodeResolver : public InodeResolver {
+ public:
+  virtual rxcpp::observable<InodeResult>
+      FindFilenamesFromInodes(std::vector<Inode> inodes) const override;
+
+  virtual rxcpp::observable<InodeResult>
+      EmitAll() const override;
+
+  OutOfProcessInodeResolver(InodeResolverDependencies dependencies);
+  ~OutOfProcessInodeResolver();
+ private:
+  struct Impl;
+  Impl* impl_;
+};
+
+}
+
+#endif  // IORAP_SRC_INODE2FILENAME_OUT_OF_PROCESS_INDOE_RESOLVER_H_