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// Copyright 2022 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "mojo/core/ipcz_driver/transmissible_platform_handle.h"
#include <utility>
#include "base/check.h"
#include "base/notreached.h"
#include "build/build_config.h"
namespace mojo::core::ipcz_driver {
TransmissiblePlatformHandle::TransmissiblePlatformHandle() = default;
TransmissiblePlatformHandle::TransmissiblePlatformHandle(PlatformHandle handle)
: handle_(std::move(handle)) {
#if BUILDFLAG(IS_APPLE)
// Only Mach port rights are supported as transmissible handles on macOS. To
// transmit a file descriptor it must first be placed into a fileport.
DCHECK(handle_.is_valid_mach_port());
#elif BUILDFLAG(IS_FUCHSIA)
// Only zx handles are supported as transmissible handles on Fuchsia. To
// transmit a file descriptor, its underlying fdio object must be extracted
// and transmitted.
DCHECK(handle_.is_valid_handle());
#elif BUILDFLAG(IS_WIN)
// TransmissiblePlatformHandle is not used on Windows because there is no such
// thing: handles are inlined as message data during driver object
// serialization.
NOTREACHED();
#endif
}
TransmissiblePlatformHandle::~TransmissiblePlatformHandle() = default;
void TransmissiblePlatformHandle::Close() {
handle_.reset();
}
bool TransmissiblePlatformHandle::IsSerializable() const {
return true;
}
bool TransmissiblePlatformHandle::GetSerializedDimensions(
Transport& transmitter,
size_t& num_bytes,
size_t& num_handles) {
DCHECK(handle_.is_valid());
num_bytes = 0;
num_handles = 1;
return true;
}
bool TransmissiblePlatformHandle::Serialize(
Transport& transmitter,
base::span<uint8_t> data,
base::span<PlatformHandle> handles) {
DCHECK_EQ(0u, data.size());
DCHECK(handle_.is_valid());
DCHECK_EQ(1u, handles.size());
handles[0] = std::move(handle_);
return true;
}
// static
scoped_refptr<TransmissiblePlatformHandle>
TransmissiblePlatformHandle::Deserialize(base::span<const uint8_t> data,
base::span<PlatformHandle> handles) {
if (handles.size() != 1) {
return nullptr;
}
return base::MakeRefCounted<TransmissiblePlatformHandle>(
std::move(handles[0]));
}
} // namespace mojo::core::ipcz_driver
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