77 lines
2.4 KiB
C++
77 lines
2.4 KiB
C++
// Copyright (c) 2012 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "build/build_config.h"
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#include "ipc/ipc_platform_file.h"
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#if defined(OS_WIN)
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#include <windows.h>
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#elif defined(OS_POSIX) || defined(OS_FUCHSIA)
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#include <unistd.h>
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#include "base/posix/eintr_wrapper.h"
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#endif
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namespace IPC {
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#if defined(OS_WIN)
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PlatformFileForTransit::PlatformFileForTransit() : handle_(nullptr) {}
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PlatformFileForTransit::PlatformFileForTransit(HANDLE handle)
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: handle_(handle) {}
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bool PlatformFileForTransit::operator==(
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const PlatformFileForTransit& platform_file) const {
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return handle_ == platform_file.handle_;
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}
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bool PlatformFileForTransit::operator!=(
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const PlatformFileForTransit& platform_file) const {
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return !(*this == platform_file);
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}
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HANDLE PlatformFileForTransit::GetHandle() const {
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return handle_;
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}
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bool PlatformFileForTransit::IsValid() const {
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return handle_ != nullptr;
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}
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#endif // defined(OS_WIN)
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PlatformFileForTransit GetPlatformFileForTransit(base::PlatformFile handle,
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bool close_source_handle) {
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#if defined(OS_WIN)
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HANDLE raw_handle = INVALID_HANDLE_VALUE;
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DWORD options = DUPLICATE_SAME_ACCESS;
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if (close_source_handle)
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options |= DUPLICATE_CLOSE_SOURCE;
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if (handle == INVALID_HANDLE_VALUE ||
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!::DuplicateHandle(::GetCurrentProcess(), handle, ::GetCurrentProcess(),
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&raw_handle, 0, FALSE, options)) {
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return IPC::InvalidPlatformFileForTransit();
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}
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return IPC::PlatformFileForTransit(raw_handle);
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#elif defined(OS_POSIX) || defined(OS_FUCHSIA)
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// If asked to close the source, we can simply re-use the source fd instead of
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// dup()ing and close()ing.
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// When we're not closing the source, we need to duplicate the handle and take
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// ownership of that. The reason is that this function is often used to
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// generate IPC messages, and the handle must remain valid until it's sent to
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// the other process from the I/O thread. Without the dup, calling code might
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// close the source handle before the message is sent, creating a race
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// condition.
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int fd = close_source_handle ? handle : HANDLE_EINTR(::dup(handle));
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return base::FileDescriptor(fd, true);
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#endif
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}
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PlatformFileForTransit TakePlatformFileForTransit(base::File file) {
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return GetPlatformFileForTransit(file.TakePlatformFile(), true);
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}
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} // namespace IPC
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