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| 1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. |
| 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. |
| 4 |
| 5 #include "content/public/common/sandbox_init.h" |
| 6 |
| 7 namespace content { |
| 8 |
| 9 IPC::PlatformFileForTransit BrokerGetFileHandleForProcess( |
| 10 base::PlatformFile handle, |
| 11 base::ProcessId target_process_id, |
| 12 bool should_close_source) { |
| 13 IPC::PlatformFileForTransit out_handle; |
| 14 #if defined(OS_WIN) |
| 15 DWORD options = DUPLICATE_SAME_ACCESS; |
| 16 if (should_close_source) |
| 17 options |= DUPLICATE_CLOSE_SOURCE; |
| 18 if (!content::BrokerDuplicateHandle(handle, target_process_id, &out_handle, |
| 19 0, options)) { |
| 20 out_handle = IPC::InvalidPlatformFileForTransit(); |
| 21 } |
| 22 #elif defined(OS_POSIX) |
| 23 // If asked to close the source, we can simply re-use the source fd instead of |
| 24 // dup()ing and close()ing. |
| 25 // When we're not closing the source, we need to duplicate the handle and take |
| 26 // ownership of that. The reason is that this function is often used to |
| 27 // generate IPC messages, and the handle must remain valid until it's sent to |
| 28 // the other process from the I/O thread. Without the dup, calling code might |
| 29 // close the source handle before the message is sent, creating a race |
| 30 // condition. |
| 31 int fd = should_close_source ? handle : ::dup(handle); |
| 32 out_handle = base::FileDescriptor(fd, true); |
| 33 #else |
| 34 #error Not implemented. |
| 35 #endif |
| 36 return out_handle; |
| 37 } |
| 38 |
| 39 } // namespace content |
| 40 |
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