eventfd_test.cpp revision 8baa929d5d3bcf63381cf78ba76168c80c303f5e 
1/*
2 * Copyright (C) 2013 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#include <gtest/gtest.h>
18
19#if !defined(__GLIBC__) // Android's prebuilt gcc's header files don't include <sys/eventfd.h>.
20
21#include <sys/eventfd.h>
22
23TEST(eventfd, smoke) {
24  unsigned int initial_value = 2;
25  int fd = eventfd(initial_value, O_NONBLOCK);
26  ASSERT_NE(fd, -1);
27
28  eventfd_t value = 123;
29  ASSERT_EQ(0, eventfd_read(fd, &value));
30  ASSERT_EQ(initial_value, value);
31
32  // Reading clears the counter.
33  ASSERT_EQ(-1, eventfd_read(fd, &value));
34  ASSERT_EQ(EAGAIN, errno);
35
36  // Values written are added until the next read.
37  ASSERT_EQ(0, eventfd_write(fd, 1));
38  ASSERT_EQ(0, eventfd_write(fd, 1));
39  ASSERT_EQ(0, eventfd_write(fd, 1));
40
41  ASSERT_EQ(0, eventfd_read(fd, &value));
42  ASSERT_EQ(3U, value);
43
44  close(fd);
45}
46
47#endif
48