/*
 * Copyright (C) 2013 The Android Open Source Project
 *
 * 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 <gtest/gtest.h>

#include <errno.h>
#include <fcntl.h>
#include <signal.h>
#include <sys/epoll.h>
#include <unistd.h>

TEST(sys_epoll, smoke) {
  int epoll_fd = epoll_create(1);
  ASSERT_NE(-1, epoll_fd) << strerror(errno);
  epoll_event events[1];

  // Regular epoll_wait.
  ASSERT_EQ(0, epoll_wait(epoll_fd, events, 1, 1));

  // epoll_pwait without a sigset (which is equivalent to epoll_wait).
  ASSERT_EQ(0, epoll_pwait(epoll_fd, events, 1, 1, NULL));

  // epoll_pwait with a sigset.
  sigset_t ss;
  sigemptyset(&ss);
  sigaddset(&ss, SIGPIPE);
  ASSERT_EQ(0, epoll_pwait(epoll_fd, events, 1, 1, &ss));
}

TEST(sys_epoll, epoll_create_invalid_size) {
  errno = 0;
  ASSERT_EQ(-1, epoll_create(0));
  ASSERT_EQ(EINVAL, errno);
}

TEST(sys_epoll, epoll_event_data) {
  int epoll_fd = epoll_create(1);
  ASSERT_NE(-1, epoll_fd) << strerror(errno);

  int fds[2];
  ASSERT_NE(-1, pipe(fds));

  const uint64_t expected = 0x123456789abcdef0;

  // Get ready to poll on read end of pipe.
  epoll_event ev;
  ev.events = EPOLLIN;
  ev.data.u64 = expected;
  ASSERT_NE(-1, epoll_ctl(epoll_fd, EPOLL_CTL_ADD, fds[0], &ev));

  // Ensure there's something in the pipe.
  ASSERT_EQ(1, write(fds[1], "\n", 1));

  // Poll.
  epoll_event events[1];
  ASSERT_EQ(1, epoll_wait(epoll_fd, events, 1, 1));
  ASSERT_EQ(expected, events[0].data.u64);

  close(fds[0]);
  close(fds[1]);
}