base/fuchsia/scoped_zx_handle.h

// Copyright 2017 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef BASE_FUCHSIA_SCOPED_ZX_HANDLE_H_
#define BASE_FUCHSIA_SCOPED_ZX_HANDLE_H_

#include <zircon/status.h>
#include <zircon/syscalls.h>

#include "base/base_export.h"
#include "base/fuchsia/fuchsia_logging.h"
#include "base/scoped_generic.h"

namespace zx {
class channel;
}

namespace base {

namespace internal {

struct ScopedZxHandleTraits {
  static zx_handle_t InvalidValue() { return ZX_HANDLE_INVALID; }
  static void Free(zx_handle_t object) {
    zx_status_t status = zx_handle_close(object);
    ZX_CHECK(status == ZX_OK, status) << "zx_handle_close";
  }
};

}  // namespace internal

class BASE_EXPORT ScopedZxHandle
    : public ScopedGeneric<zx_handle_t, internal::ScopedZxHandleTraits> {
 public:
  ScopedZxHandle() = default;
  explicit ScopedZxHandle(zx_handle_t value) : ScopedGeneric(value) {}

  explicit operator bool() const { return get() != ZX_HANDLE_INVALID; }

  // Helper to converts zx::channel to ScopedZxHandle.
  static ScopedZxHandle FromZxChannel(zx::channel channel);
};

}  // namespace base

#endif  // BASE_FUCHSIA_SCOPED_ZX_HANDLE_H_