shared_fd.h

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//
// Copyright (C) 2026 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.
 
#pragma once
 
#include <stdint.h>
 
#include "cuttlefish/common/libs/fs/shared_fd.h"
#include "cuttlefish/io/io.h"
#include "cuttlefish/result/result_type.h"
 
namespace cuttlefish {
 
class SharedFdIo : public ReaderWriterSeeker {
 public:
  explicit SharedFdIo(SharedFD);
 
  Result<void> Visit(IoVisitor&) override;
  Result<uint64_t> Read(void* buf, uint64_t count) override;
  Result<uint64_t> Write(const void* buf, uint64_t count) override;
  Result<uint64_t> SeekSet(uint64_t offset) override;
  Result<uint64_t> SeekCur(int64_t offset) override;
  Result<uint64_t> SeekEnd(int64_t offset) override;
  Result<uint64_t> PRead(void* buf, uint64_t count,
                         uint64_t offset) const override;
  Result<uint64_t> PWrite(const void* buf, uint64_t count,
                          uint64_t offset) override;
  Result<void> Truncate(uint64_t size) override;
 
 private:
  SharedFD fd_;
};
 
}  // namespace cuttlefish