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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.
#include <errno.h>
#include <signal.h>
#include <sys/syscall.h>
#include <sys/types.h>
#include <unistd.h>
#include <atomic>
#include "gtest/gtest.h"
#include "absl/synchronization/mutex.h"
#include "absl/time/clock.h"
#include "absl/time/time.h"
#include "test/util/signal_util.h"
#include "test/util/test_util.h"
#include "test/util/thread_util.h"
namespace gvisor {
namespace testing {
namespace {
void NoopSignalHandler(int sig, siginfo_t* info, void* context) {}
} // namespace
TEST(PauseTest, OnlyReturnsWhenSignalHandled) {
struct sigaction sa;
sigfillset(&sa.sa_mask);
// Ensure that SIGUSR1 is ignored.
sa.sa_handler = SIG_IGN;
ASSERT_THAT(sigaction(SIGUSR1, &sa, nullptr), SyscallSucceeds());
// Register a handler for SIGUSR2.
sa.sa_sigaction = NoopSignalHandler;
sa.sa_flags = SA_SIGINFO;
ASSERT_THAT(sigaction(SIGUSR2, &sa, nullptr), SyscallSucceeds());
// The child sets their own tid.
absl::Mutex mu;
pid_t child_tid = 0;
bool child_tid_available = false;
std::atomic<int> sent_signal{0};
std::atomic<int> waking_signal{0};
ScopedThread t([&] {
mu.Lock();
child_tid = gettid();
child_tid_available = true;
mu.Unlock();
EXPECT_THAT(pause(), SyscallFailsWithErrno(EINTR));
waking_signal.store(sent_signal.load());
});
mu.Lock();
mu.Await(absl::Condition(&child_tid_available));
mu.Unlock();
// Wait a bit to let the child enter pause().
absl::SleepFor(absl::Seconds(3));
// The child should not be woken by SIGUSR1.
sent_signal.store(SIGUSR1);
ASSERT_THAT(tgkill(getpid(), child_tid, SIGUSR1), SyscallSucceeds());
absl::SleepFor(absl::Seconds(3));
// The child should be woken by SIGUSR2.
sent_signal.store(SIGUSR2);
ASSERT_THAT(tgkill(getpid(), child_tid, SIGUSR2), SyscallSucceeds());
absl::SleepFor(absl::Seconds(3));
EXPECT_EQ(SIGUSR2, waking_signal.load());
}
} // namespace testing
} // namespace gvisor
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