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