1 files changed, 189 insertions, 0 deletions
diff --git a/test/syscalls/linux/eventfd.cc b/test/syscalls/linux/eventfd.cc
new file mode 100644
index 000000000..ffcd20622
--- /dev/null
+++ b/test/syscalls/linux/eventfd.cc
@@ -0,0 +1,189 @@
+// 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 <errno.h>
+#include <pthread.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/epoll.h>
+#include <sys/eventfd.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+#include "gtest/gtest.h"
+#include "test/util/test_util.h"
+#include "test/util/thread_util.h"
+
+namespace gvisor {
+namespace testing {
+
+namespace {
+
+TEST(EventfdTest, Nonblock) {
+  int efd;
+  ASSERT_THAT(efd = eventfd(0, EFD_NONBLOCK | EFD_SEMAPHORE),
+              SyscallSucceeds());
+
+  uint64_t l;
+  ASSERT_THAT(read(efd, &l, sizeof(l)), SyscallFailsWithErrno(EAGAIN));
+
+  l = 1;
+  ASSERT_THAT(write(efd, &l, sizeof(l)), SyscallSucceeds());
+
+  l = 0;
+  ASSERT_THAT(read(efd, &l, sizeof(l)), SyscallSucceeds());
+  EXPECT_EQ(l, 1);
+
+  ASSERT_THAT(read(efd, &l, sizeof(l)), SyscallFailsWithErrno(EAGAIN));
+}
+
+void* read_three_times(void* arg) {
+  int efd = *reinterpret_cast<int*>(arg);
+  uint64_t l;
+  read(efd, &l, sizeof(l));
+  read(efd, &l, sizeof(l));
+  read(efd, &l, sizeof(l));
+  return nullptr;
+}
+
+TEST(EventfdTest, BlockingWrite) {
+  int efd;
+  ASSERT_THAT(efd = eventfd(0, EFD_SEMAPHORE), SyscallSucceeds());
+
+  pthread_t p;
+  ASSERT_THAT(pthread_create(&p, nullptr, read_three_times,
+                             reinterpret_cast<void*>(&efd)),
+              SyscallSucceeds());
+
+  uint64_t 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) {
+  int efd;
+  ASSERT_THAT(efd = eventfd(0, EFD_NONBLOCK | EFD_SEMAPHORE),
+              SyscallSucceeds());
+
+  uint64_t l = 16;
+  ASSERT_THAT(write(efd, &l, 4), SyscallFailsWithErrno(EINVAL));
+}
+
+TEST(EventfdTest, SmallRead) {
+  int efd;
+  ASSERT_THAT(efd = eventfd(0, EFD_NONBLOCK | EFD_SEMAPHORE),
+              SyscallSucceeds());
+
+  uint64_t l = 1;
+  ASSERT_THAT(write(efd, &l, sizeof(l)), SyscallSucceeds());
+
+  l = 0;
+  ASSERT_THAT(read(efd, &l, 4), SyscallFailsWithErrno(EINVAL));
+}
+
+TEST(EventfdTest, BigWrite) {
+  int efd;
+  ASSERT_THAT(efd = eventfd(0, EFD_NONBLOCK | EFD_SEMAPHORE),
+              SyscallSucceeds());
+
+  uint64_t big[16];
+  big[0] = 16;
+  ASSERT_THAT(write(efd, big, sizeof(big)), SyscallSucceeds());
+}
+
+TEST(EventfdTest, BigRead) {
+  int efd;
+  ASSERT_THAT(efd = eventfd(0, EFD_NONBLOCK | EFD_SEMAPHORE),
+              SyscallSucceeds());
+
+  uint64_t l = 1;
+  ASSERT_THAT(write(efd, &l, sizeof(l)), SyscallSucceeds());
+
+  uint64_t big[16];
+  ASSERT_THAT(read(efd, big, sizeof(big)), SyscallSucceeds());
+  EXPECT_EQ(big[0], 1);
+}
+
+TEST(EventfdTest, BigWriteBigRead) {
+  int efd;
+  ASSERT_THAT(efd = eventfd(0, EFD_NONBLOCK | EFD_SEMAPHORE),
+              SyscallSucceeds());
+
+  uint64_t l[16];
+  l[0] = 16;
+  ASSERT_THAT(write(efd, l, sizeof(l)), SyscallSucceeds());
+  ASSERT_THAT(read(efd, 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.
+  int efd;
+  ASSERT_THAT(efd = eventfd(7, EFD_SEMAPHORE | EFD_NONBLOCK),
+              SyscallSucceeds());
+  // Create an epoll fd to listen to efd.
+  int epollfd;
+  ASSERT_THAT(epollfd = epoll_create1(0), SyscallSucceeds());
+  // Add efd to epoll.
+  struct epoll_event add_ev;
+  add_ev.events = EPOLLIN | EPOLLET;
+  add_ev.data.fd = efd;
+  ASSERT_THAT(epoll_ctl(epollfd, EPOLL_CTL_ADD, efd, &add_ev),
+              SyscallSucceeds());
+
+  // Use epoll to get a value from efd.
+  struct epoll_event out_ev;
+  int wait_out = epoll_wait(epollfd, &out_ev, 1, kEpollTimeoutMs);
+  EXPECT_EQ(wait_out, 1);
+  EXPECT_EQ(efd, out_ev.data.fd);
+  uint64_t val = 0;
+  ASSERT_THAT(read(efd, &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_t val = 1;
+    write(efd, &val, sizeof(val));
+  });
+
+  // epoll_wait should return once the thread writes.
+  wait_out = epoll_wait(epollfd, &out_ev, 1, kEpollTimeoutMs);
+  EXPECT_EQ(wait_out, 1);
+  EXPECT_EQ(efd, out_ev.data.fd);
+
+  val = 0;
+  ASSERT_THAT(read(efd, &val, sizeof(val)), SyscallSucceeds());
+  EXPECT_EQ(val, 1);
+}
+
+}  // namespace
+
+}  // namespace testing
+}  // namespace gvisor