60 lines
1.4 KiB
C++
60 lines
1.4 KiB
C++
// Copyright 2018 Google LLC
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include "test/util/save_util.h"
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#include <stddef.h>
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#include <stdlib.h>
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#include <sys/syscall.h>
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#include <unistd.h>
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#include <atomic>
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#include <cerrno>
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#define GVISOR_COOPERATIVE_SAVE_TEST "GVISOR_COOPERATIVE_SAVE_TEST"
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namespace gvisor {
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namespace testing {
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namespace {
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bool CooperativeSaveEnabled() {
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static bool enabled = getenv(GVISOR_COOPERATIVE_SAVE_TEST) != nullptr;
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return enabled;
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}
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std::atomic<int> save_disable;
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} // namespace
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DisableSave::DisableSave() { save_disable++; }
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DisableSave::~DisableSave() { reset(); }
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void DisableSave::reset() {
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if (!reset_) {
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reset_ = true;
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save_disable--;
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}
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}
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void MaybeSave() {
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if (CooperativeSaveEnabled() && !save_disable.load()) {
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int orig_errno = errno;
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syscall(SYS_create_module, nullptr, 0);
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errno = orig_errno;
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}
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}
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} // namespace testing
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} // namespace gvisor
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