blob: 3a8198e38c1a740642369cf978270c1fc8675b0d [file] [log] [blame]
// Copyright (c) 2012 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.
#include "build/build_config.h"
#include "ipc/ipc_platform_file.h"
#if defined(OS_WIN)
#include <windows.h>
#elif defined(OS_POSIX) || defined(OS_FUCHSIA)
#include <unistd.h>
#include "base/posix/eintr_wrapper.h"
namespace IPC {
#if defined(OS_WIN)
PlatformFileForTransit::PlatformFileForTransit() : handle_(nullptr) {}
PlatformFileForTransit::PlatformFileForTransit(HANDLE handle)
: handle_(handle) {}
bool PlatformFileForTransit::operator==(
const PlatformFileForTransit& platform_file) const {
return handle_ == platform_file.handle_;
bool PlatformFileForTransit::operator!=(
const PlatformFileForTransit& platform_file) const {
return !(*this == platform_file);
HANDLE PlatformFileForTransit::GetHandle() const {
return handle_;
bool PlatformFileForTransit::IsValid() const {
return handle_ != nullptr;
#endif // defined(OS_WIN)
PlatformFileForTransit GetPlatformFileForTransit(base::PlatformFile handle,
bool close_source_handle) {
#if defined(OS_WIN)
if (close_source_handle)
if (handle == INVALID_HANDLE_VALUE ||
!::DuplicateHandle(::GetCurrentProcess(), handle, ::GetCurrentProcess(),
&raw_handle, 0, FALSE, options)) {
return IPC::InvalidPlatformFileForTransit();
return IPC::PlatformFileForTransit(raw_handle);
#elif defined(OS_POSIX) || defined(OS_FUCHSIA)
// If asked to close the source, we can simply re-use the source fd instead of
// dup()ing and close()ing.
// When we're not closing the source, we need to duplicate the handle and take
// ownership of that. The reason is that this function is often used to
// generate IPC messages, and the handle must remain valid until it's sent to
// the other process from the I/O thread. Without the dup, calling code might
// close the source handle before the message is sent, creating a race
// condition.
int fd = close_source_handle ? handle : HANDLE_EINTR(::dup(handle));
return base::FileDescriptor(fd, true);
PlatformFileForTransit TakePlatformFileForTransit(base::File file) {
return GetPlatformFileForTransit(file.TakePlatformFile(), true);
} // namespace IPC