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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 <pthread.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/epoll.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
#include "gtest/gtest.h"
#include "test/util/epoll_util.h"
#include "test/util/eventfd_util.h"
#include "test/util/test_util.h"
#include "test/util/thread_util.h"
namespace gvisor {
namespace testing {
namespace {
TEST(EventfdTest, Nonblock) {
FileDescriptor efd =
ASSERT_NO_ERRNO_AND_VALUE(NewEventFD(0, EFD_NONBLOCK | EFD_SEMAPHORE));
uint64 l;
ASSERT_THAT(read(efd.get(), &l, sizeof(l)), SyscallFailsWithErrno(EAGAIN));
l = 1;
ASSERT_THAT(write(efd.get(), &l, sizeof(l)), SyscallSucceeds());
l = 0;
ASSERT_THAT(read(efd.get(), &l, sizeof(l)), SyscallSucceeds());
EXPECT_EQ(l, 1);
ASSERT_THAT(read(efd.get(), &l, sizeof(l)), SyscallFailsWithErrno(EAGAIN));
}
void* read_three_times(void* arg) {
int efd = *reinterpret_cast<int*>(arg);
uint64 l;
EXPECT_THAT(read(efd, &l, sizeof(l)), SyscallSucceedsWithValue(sizeof(l)));
EXPECT_THAT(read(efd, &l, sizeof(l)), SyscallSucceedsWithValue(sizeof(l)));
EXPECT_THAT(read(efd, &l, sizeof(l)), SyscallSucceedsWithValue(sizeof(l)));
return nullptr;
}
TEST(EventfdTest, BlockingWrite) {
FileDescriptor fd = ASSERT_NO_ERRNO_AND_VALUE(NewEventFD(0, EFD_SEMAPHORE));
int efd = fd.get();
pthread_t p;
ASSERT_THAT(pthread_create(&p, nullptr, read_three_times,
reinterpret_cast<void*>(&efd)),
SyscallSucceeds());
uint64 l = 1;
ASSERT_THAT(write(efd, &l, sizeof(l)), SyscallSucceeds());
EXPECT_EQ(l, 1);
ASSERT_THAT(write(efd, &l, sizeof(l)), SyscallSucceeds());
EXPECT_EQ(l, 1);
ASSERT_THAT(write(efd, &l, sizeof(l)), SyscallSucceeds());
EXPECT_EQ(l, 1);
ASSERT_THAT(pthread_join(p, nullptr), SyscallSucceeds());
}
TEST(EventfdTest, SmallWrite) {
FileDescriptor efd =
ASSERT_NO_ERRNO_AND_VALUE(NewEventFD(0, EFD_NONBLOCK | EFD_SEMAPHORE));
uint64 l = 16;
ASSERT_THAT(write(efd.get(), &l, 4), SyscallFailsWithErrno(EINVAL));
}
TEST(EventfdTest, SmallRead) {
FileDescriptor efd =
ASSERT_NO_ERRNO_AND_VALUE(NewEventFD(0, EFD_NONBLOCK | EFD_SEMAPHORE));
uint64 l = 1;
ASSERT_THAT(write(efd.get(), &l, sizeof(l)), SyscallSucceeds());
l = 0;
ASSERT_THAT(read(efd.get(), &l, 4), SyscallFailsWithErrno(EINVAL));
}
TEST(EventfdTest, BigWrite) {
FileDescriptor efd =
ASSERT_NO_ERRNO_AND_VALUE(NewEventFD(0, EFD_NONBLOCK | EFD_SEMAPHORE));
uint64 big[16];
big[0] = 16;
ASSERT_THAT(write(efd.get(), big, sizeof(big)), SyscallSucceeds());
}
TEST(EventfdTest, BigRead) {
FileDescriptor efd =
ASSERT_NO_ERRNO_AND_VALUE(NewEventFD(0, EFD_NONBLOCK | EFD_SEMAPHORE));
uint64 l = 1;
ASSERT_THAT(write(efd.get(), &l, sizeof(l)), SyscallSucceeds());
uint64 big[16];
ASSERT_THAT(read(efd.get(), big, sizeof(big)), SyscallSucceeds());
EXPECT_EQ(big[0], 1);
}
TEST(EventfdTest, BigWriteBigRead) {
FileDescriptor efd =
ASSERT_NO_ERRNO_AND_VALUE(NewEventFD(0, EFD_NONBLOCK | EFD_SEMAPHORE));
uint64 l[16];
l[0] = 16;
ASSERT_THAT(write(efd.get(), l, sizeof(l)), SyscallSucceeds());
ASSERT_THAT(read(efd.get(), l, sizeof(l)), SyscallSucceeds());
EXPECT_EQ(l[0], 1);
}
// NotifyNonZero is inherently racy, so random save is disabled.
TEST(EventfdTest, NotifyNonZero_NoRandomSave) {
// Waits will time out at 10 seconds.
constexpr int kEpollTimeoutMs = 10000;
// Create an eventfd descriptor.
FileDescriptor efd =
ASSERT_NO_ERRNO_AND_VALUE(NewEventFD(7, EFD_NONBLOCK | EFD_SEMAPHORE));
// Create an epoll fd to listen to efd.
FileDescriptor epollfd = ASSERT_NO_ERRNO_AND_VALUE(NewEpollFD());
// Add efd to epoll.
ASSERT_NO_ERRNO(
RegisterEpollFD(epollfd.get(), efd.get(), EPOLLIN | EPOLLET, efd.get()));
// Use epoll to get a value from efd.
struct epoll_event out_ev;
int wait_out = epoll_wait(epollfd.get(), &out_ev, 1, kEpollTimeoutMs);
EXPECT_EQ(wait_out, 1);
EXPECT_EQ(efd.get(), out_ev.data.fd);
uint64 val = 0;
ASSERT_THAT(read(efd.get(), &val, sizeof(val)), SyscallSucceeds());
EXPECT_EQ(val, 1);
// Start a thread that, after this thread blocks on epoll_wait, will write to
// efd. This is racy -- it's possible that this write will happen after
// epoll_wait times out.
ScopedThread t([&efd] {
sleep(5);
uint64 val = 1;
EXPECT_THAT(write(efd.get(), &val, sizeof(val)),
SyscallSucceedsWithValue(sizeof(val)));
});
// epoll_wait should return once the thread writes.
wait_out = epoll_wait(epollfd.get(), &out_ev, 1, kEpollTimeoutMs);
EXPECT_EQ(wait_out, 1);
EXPECT_EQ(efd.get(), out_ev.data.fd);
val = 0;
ASSERT_THAT(read(efd.get(), &val, sizeof(val)), SyscallSucceeds());
EXPECT_EQ(val, 1);
}
} // namespace
} // namespace testing
} // namespace gvisor
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