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// Copyright 2018 The gVisor Authors.
//
// 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.
#ifndef GVISOR_TEST_SYSCALLS_BASE_POLL_TEST_H_
#define GVISOR_TEST_SYSCALLS_BASE_POLL_TEST_H_
#include <signal.h>
#include <sys/syscall.h>
#include <sys/types.h>
#include <syscall.h>
#include <time.h>
#include <unistd.h>
#include <memory>
#include "gtest/gtest.h"
#include "absl/synchronization/mutex.h"
#include "absl/time/time.h"
#include "test/util/logging.h"
#include "test/util/signal_util.h"
#include "test/util/thread_util.h"
namespace gvisor {
namespace testing {
// TimerThread is a cancelable timer.
class TimerThread {
public:
TimerThread(absl::Time deadline, pid_t tgid, pid_t tid)
: thread_([=] {
mu_.Lock();
mu_.AwaitWithDeadline(absl::Condition(&cancel_), deadline);
if (!cancel_) {
TEST_PCHECK(tgkill(tgid, tid, SIGALRM) == 0);
}
mu_.Unlock();
}) {}
~TimerThread() { Cancel(); }
void Cancel() {
absl::MutexLock ml(&mu_);
cancel_ = true;
}
private:
mutable absl::Mutex mu_;
bool cancel_ ABSL_GUARDED_BY(mu_) = false;
// Must be last to ensure that the destructor for the thread is run before
// any other member of the object is destroyed.
ScopedThread thread_;
};
// Base test fixture for poll, select, ppoll, and pselect tests.
//
// This fixture makes use of SIGALRM. The handler is saved in SetUp() and
// restored in TearDown().
class BasePollTest : public ::testing::Test {
protected:
BasePollTest();
~BasePollTest() override;
// Sets a timer that will send a signal to the calling thread after
// `duration`.
void SetTimer(absl::Duration duration);
// Returns true if the timer has fired.
bool TimerFired() const;
// Stops the pending timer (if any) and clear the "fired" state.
void ClearTimer();
private:
// Thread that implements the timer. If the timer is stopped, timer_ is null.
//
// We have to use a thread for this purpose because tests using this fixture
// expect to be interrupted by the timer signal, but itimers/alarm(2) send
// thread-group-directed signals, which may be handled by any thread in the
// test process.
std::unique_ptr<TimerThread> timer_;
// The original SIGALRM handler, to restore in destructor.
struct sigaction original_alarm_sa_;
};
} // namespace testing
} // namespace gvisor
#endif // GVISOR_TEST_SYSCALLS_BASE_POLL_TEST_H_
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