| // 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 "ipc/ipc_platform_file.h" |
| |
| #if defined(OS_POSIX) |
| #include <unistd.h> |
| #endif |
| |
| 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 (handle == INVALID_HANDLE_VALUE || |
| !::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 |