// Copyright (c) 2011 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 "ipc/ipc_platform_file.h" namespace IPC { PlatformFileForTransit GetFileHandleForProcess(base::PlatformFile handle, base::ProcessHandle process, bool close_source_handle) { IPC::PlatformFileForTransit out_handle; #if defined(OS_WIN) DWORD options = DUPLICATE_SAME_ACCESS; if (close_source_handle) options |= DUPLICATE_CLOSE_SOURCE; if (!::DuplicateHandle(::GetCurrentProcess(), handle, process, &out_handle, 0, FALSE, options)) { out_handle = IPC::InvalidPlatformFileForTransit(); } #elif defined(OS_POSIX) // 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 : ::dup(handle); out_handle = base::FileDescriptor(fd, true); #else #error Not implemented. #endif return out_handle; } } // namespace IPC