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 <errno.h>
18 #include <fcntl.h>
19
20 #include <gtest/gtest.h>
21
22 #include <sys/eventfd.h>
23
TEST(eventfd,smoke)24 TEST(eventfd, smoke) {
25 unsigned int initial_value = 2;
26 int fd = eventfd(initial_value, O_NONBLOCK);
27 ASSERT_NE(fd, -1);
28
29 eventfd_t value = 123;
30 ASSERT_EQ(0, eventfd_read(fd, &value));
31 ASSERT_EQ(initial_value, value);
32
33 // Reading clears the counter.
34 ASSERT_EQ(-1, eventfd_read(fd, &value));
35 ASSERT_EQ(EAGAIN, errno);
36
37 // Values written are added until the next read.
38 ASSERT_EQ(0, eventfd_write(fd, 1));
39 ASSERT_EQ(0, eventfd_write(fd, 1));
40 ASSERT_EQ(0, eventfd_write(fd, 1));
41
42 ASSERT_EQ(0, eventfd_read(fd, &value));
43 ASSERT_EQ(3U, value);
44
45 close(fd);
46 }
47