| // 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 "content/public/common/sandbox_init.h" |
| |
| #if defined(OS_ANDROID) |
| #include <unistd.h> |
| #endif |
| |
| namespace content { |
| |
| IPC::PlatformFileForTransit BrokerGetFileHandleForProcess( |
| base::PlatformFile handle, |
| base::ProcessId target_process_id, |
| bool should_close_source) { |
| IPC::PlatformFileForTransit out_handle; |
| #if defined(OS_WIN) |
| DWORD options = DUPLICATE_SAME_ACCESS; |
| if (should_close_source) |
| options |= DUPLICATE_CLOSE_SOURCE; |
| if (!content::BrokerDuplicateHandle(handle, target_process_id, &out_handle, |
| 0, 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 = should_close_source ? handle : ::dup(handle); |
| out_handle = base::FileDescriptor(fd, true); |
| #else |
| #error Not implemented. |
| #endif |
| return out_handle; |
| } |
| |
| } // namespace content |
| |