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// Copyright 2018 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/platform_handle_utils.h"
#include "build/build_config.h"
#if BUILDFLAG(IS_FUCHSIA)
#include <lib/zx/process.h>
#include <lib/zx/vmo.h>
#elif BUILDFLAG(IS_POSIX)
#include "base/files/scoped_file.h"
#elif BUILDFLAG(IS_WIN)
#include <windows.h>
#include "base/win/scoped_handle.h"
#endif
#if BUILDFLAG(IS_APPLE)
#include "base/apple/scoped_mach_port.h"
#endif
namespace mojo {
namespace core {
void ExtractPlatformHandlesFromSharedMemoryRegionHandle(
base::subtle::ScopedPlatformSharedMemoryHandle handle,
PlatformHandle* extracted_handle,
PlatformHandle* extracted_readonly_handle) {
#if BUILDFLAG(IS_WIN)
*extracted_handle = PlatformHandle(base::win::ScopedHandle(handle.Take()));
#elif BUILDFLAG(IS_FUCHSIA)
*extracted_handle = PlatformHandle(std::move(handle));
#elif BUILDFLAG(IS_APPLE)
// This is a Mach port. Same code as above and below, but separated for
// clarity.
*extracted_handle = PlatformHandle(std::move(handle));
#elif BUILDFLAG(IS_ANDROID)
// This is a file descriptor. Same code as above, but separated for clarity.
*extracted_handle = PlatformHandle(std::move(handle));
#else
*extracted_handle = PlatformHandle(std::move(handle.fd));
*extracted_readonly_handle = PlatformHandle(std::move(handle.readonly_fd));
#endif
}
base::subtle::ScopedPlatformSharedMemoryHandle
CreateSharedMemoryRegionHandleFromPlatformHandles(
PlatformHandle handle,
PlatformHandle readonly_handle) {
#if BUILDFLAG(IS_WIN)
DCHECK(!readonly_handle.is_valid());
return handle.TakeHandle();
#elif BUILDFLAG(IS_FUCHSIA)
DCHECK(!readonly_handle.is_valid());
return zx::vmo(handle.TakeHandle());
#elif BUILDFLAG(IS_APPLE)
DCHECK(!readonly_handle.is_valid());
return handle.TakeMachSendRight();
#elif BUILDFLAG(IS_ANDROID)
DCHECK(!readonly_handle.is_valid());
return handle.TakeFD();
#else
return base::subtle::ScopedFDPair(handle.TakeFD(), readonly_handle.TakeFD());
#endif
}
MojoResult UnwrapAndClonePlatformProcessHandle(
const MojoPlatformProcessHandle* process_handle,
base::Process& process) {
if (process_handle->struct_size < sizeof(*process_handle))
return MOJO_RESULT_INVALID_ARGUMENT;
#if BUILDFLAG(IS_WIN)
base::ProcessHandle in_handle = reinterpret_cast<base::ProcessHandle>(
static_cast<uintptr_t>(process_handle->value));
#else
base::ProcessHandle in_handle =
static_cast<base::ProcessHandle>(process_handle->value);
#endif
if (in_handle == base::kNullProcessHandle) {
process = base::Process();
return MOJO_RESULT_OK;
}
#if BUILDFLAG(IS_WIN)
base::ProcessHandle out_handle;
if (!::DuplicateHandle(::GetCurrentProcess(), in_handle,
::GetCurrentProcess(), &out_handle, 0, FALSE,
DUPLICATE_SAME_ACCESS)) {
return MOJO_RESULT_INVALID_ARGUMENT;
}
process = base::Process(out_handle);
#elif BUILDFLAG(IS_FUCHSIA)
zx::process out;
if (zx::unowned_process(in_handle)->duplicate(ZX_RIGHT_SAME_RIGHTS, &out) !=
ZX_OK) {
return MOJO_RESULT_INVALID_ARGUMENT;
}
process = base::Process(out.release());
#else
process = base::Process(in_handle);
#endif
return MOJO_RESULT_OK;
}
} // namespace core
} // namespace mojo
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