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// Copyright 2021 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef BASE_TEST_SCOPED_DEV_ZERO_FUCHSIA_H_
#define BASE_TEST_SCOPED_DEV_ZERO_FUCHSIA_H_
#include <lib/fdio/namespace.h>
#include "base/memory/ref_counted.h"
#include "base/memory/scoped_refptr.h"
#include "base/threading/sequence_bound.h"
#include "base/threading/thread.h"
namespace base {
// An object that causes /dev/zero to exist during its lifetime. A reference to
// this class may be held by tests that require access to /dev/zero for the
// lifetime of that need.
class ScopedDevZero final : public RefCounted<ScopedDevZero> {
public:
REQUIRE_ADOPTION_FOR_REFCOUNTED_TYPE();
// Returns a reference to the process-global /dev/zero. This must only be
// called, and the returned reference released, on the main thread. Returns
// null in case of failure to create the instance. It is good practice for
// tests to ASSERT the returned pointer.
static scoped_refptr<ScopedDevZero> Get();
ScopedDevZero(const ScopedDevZero&) = delete;
ScopedDevZero operator=(const ScopedDevZero&) = delete;
private:
friend class RefCounted<ScopedDevZero>;
class Server;
ScopedDevZero();
~ScopedDevZero();
// Spins off the server thread and binds its pesudo-dir to /dev, returning
// true if all goes well, or false in case of any error.
bool Initialize();
// A raw pointer to the process's single instance. Multiple references to this
// instance may be handed out to consumers.
static ScopedDevZero* instance_;
Thread io_thread_;
fdio_ns_t* global_namespace_ = nullptr;
SequenceBound<Server> server_;
};
} // namespace base
#endif // BASE_TEST_SCOPED_DEV_ZERO_FUCHSIA_H_
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