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53 lines
1.4 KiB
C++
53 lines
1.4 KiB
C++
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// Copyright 2015 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include <stdint.h>
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#include "base/logging.h"
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#include "base/process/process_handle.h"
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#include "build/build_config.h"
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namespace base {
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namespace {
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bool g_have_unique_id = false;
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uint32_t g_unique_id;
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// The process which set |g_unique_id|.
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ProcessId g_procid;
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// Mangle IDs so that they are not accidentally used as PIDs, e.g. as an
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// argument to kill or waitpid.
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uint32_t MangleProcessId(ProcessId process_id) {
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// Add a large power of 10 so that the pid is still the pid is still readable
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// inside the mangled id.
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return static_cast<uint32_t>(process_id) + 1000000000U;
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}
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} // namespace
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uint32_t GetUniqueIdForProcess() {
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if (!g_have_unique_id) {
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return MangleProcessId(GetCurrentProcId());
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}
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// Make sure we are the same process that set |g_procid|. This check may have
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// false negatives (if a process ID was reused) but should have no false
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// positives.
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DCHECK_EQ(GetCurrentProcId(), g_procid);
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return g_unique_id;
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}
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#if defined(OS_LINUX) || defined(OS_AIX)
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void InitUniqueIdForProcessInPidNamespace(ProcessId pid_outside_of_namespace) {
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g_unique_id = MangleProcessId(pid_outside_of_namespace);
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g_procid = GetCurrentProcId();
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g_have_unique_id = true;
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}
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#endif
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} // namespace base
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