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78 lines
2.4 KiB
C++
78 lines
2.4 KiB
C++
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// Copyright 2016 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 "base/process/process.h"
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#include <mach/mach.h>
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#include "base/feature_list.h"
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#include "base/mac/mach_logging.h"
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namespace base {
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// Enables backgrounding hidden renderers on Mac.
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const Feature kMacAllowBackgroundingProcesses{"MacAllowBackgroundingProcesses",
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FEATURE_DISABLED_BY_DEFAULT};
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bool Process::CanBackgroundProcesses() {
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return FeatureList::IsEnabled(kMacAllowBackgroundingProcesses);
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}
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bool Process::IsProcessBackgrounded(PortProvider* port_provider) const {
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DCHECK(IsValid());
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if (port_provider == nullptr || !CanBackgroundProcesses())
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return false;
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mach_port_t task_port = port_provider->TaskForPid(Pid());
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if (task_port == TASK_NULL)
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return false;
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task_category_policy_data_t category_policy;
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mach_msg_type_number_t task_info_count = TASK_CATEGORY_POLICY_COUNT;
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boolean_t get_default = FALSE;
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kern_return_t result =
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task_policy_get(task_port, TASK_CATEGORY_POLICY,
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reinterpret_cast<task_policy_t>(&category_policy),
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&task_info_count, &get_default);
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MACH_LOG_IF(ERROR, result != KERN_SUCCESS, result)
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<< "task_policy_get TASK_CATEGORY_POLICY";
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if (result == KERN_SUCCESS && get_default == FALSE) {
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return category_policy.role == TASK_BACKGROUND_APPLICATION;
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}
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return false;
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}
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bool Process::SetProcessBackgrounded(PortProvider* port_provider,
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bool background) {
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DCHECK(IsValid());
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if (port_provider == nullptr || !CanBackgroundProcesses())
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return false;
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mach_port_t task_port = port_provider->TaskForPid(Pid());
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if (task_port == TASK_NULL)
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return false;
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if (IsProcessBackgrounded(port_provider) == background)
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return true;
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task_category_policy category_policy;
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category_policy.role =
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background ? TASK_BACKGROUND_APPLICATION : TASK_FOREGROUND_APPLICATION;
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kern_return_t result =
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task_policy_set(task_port, TASK_CATEGORY_POLICY,
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reinterpret_cast<task_policy_t>(&category_policy),
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TASK_CATEGORY_POLICY_COUNT);
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if (result != KERN_SUCCESS) {
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MACH_LOG(ERROR, result) << "task_policy_set TASK_CATEGORY_POLICY";
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return false;
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}
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return true;
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}
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} // namespace base
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