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