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| 1 // Copyright 2015 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 <stdint.h> |
| 6 |
| 7 #include "base/logging.h" |
| 8 #include "base/process/process_handle.h" |
| 9 #include "build/build_config.h" |
| 10 |
| 11 namespace base { |
| 12 |
| 13 namespace { |
| 14 bool g_have_unique_id = false; |
| 15 uint32_t g_unique_id; |
| 16 |
| 17 // The process which set |g_unique_id|. |
| 18 ProcessId g_procid; |
| 19 |
| 20 // Mangle IDs so that they are not accidentally used as PIDs, e.g. as an |
| 21 // argument to kill or waitpid. |
| 22 uint32_t MangleProcessId(ProcessId process_id) { |
| 23 // Add a large power of 10 so that the pid is still the pid is still readable |
| 24 // inside the mangled id. |
| 25 return static_cast<uint32_t>(process_id) + 1000000000U; |
| 26 } |
| 27 |
| 28 } // namespace |
| 29 |
| 30 uint32_t GetUniqueIdForProcess() { |
| 31 if (!g_have_unique_id) { |
| 32 return MangleProcessId(GetCurrentProcId()); |
| 33 } |
| 34 |
| 35 // Make sure we are the same process that set |g_procid|. This check may have |
| 36 // false negatives (if a process ID was reused) but should have no false |
| 37 // positives. |
| 38 DCHECK_EQ(GetCurrentProcId(), g_procid); |
| 39 return g_unique_id; |
| 40 } |
| 41 |
| 42 #if defined(OS_LINUX) |
| 43 |
| 44 void InitUniqueIdForProcessInPidNamespace(ProcessId pid_outside_of_namespace) { |
| 45 g_unique_id = MangleProcessId(pid_outside_of_namespace); |
| 46 g_procid = GetCurrentProcId(); |
| 47 g_have_unique_id = true; |
| 48 } |
| 49 |
| 50 #endif |
| 51 |
| 52 } // namespace base |
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