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
24 #include "utils.h"
25
TEST(eventfd,smoke)26 TEST(eventfd, smoke) {
27 constexpr unsigned int kInitialValue = 2;
28 int fd = eventfd(kInitialValue, EFD_NONBLOCK);
29 ASSERT_NE(-1, fd);
30
31 eventfd_t value = 123;
32 ASSERT_EQ(0, eventfd_read(fd, &value));
33 ASSERT_EQ(kInitialValue, value);
34
35 // Reading clears the counter.
36 ASSERT_EQ(-1, eventfd_read(fd, &value));
37 ASSERT_EQ(EAGAIN, errno);
38
39 // Values written are added until the next read.
40 ASSERT_EQ(0, eventfd_write(fd, 1));
41 ASSERT_EQ(0, eventfd_write(fd, 1));
42 ASSERT_EQ(0, eventfd_write(fd, 1));
43
44 ASSERT_EQ(0, eventfd_read(fd, &value));
45 ASSERT_EQ(3U, value);
46
47 close(fd);
48 }
49
TEST(eventfd,cloexec)50 TEST(eventfd, cloexec) {
51 constexpr unsigned int kInitialValue = 2;
52 int fd = eventfd(kInitialValue, EFD_CLOEXEC);
53 ASSERT_NE(-1, fd);
54 AssertCloseOnExec(fd, true);
55
56 eventfd_t value = 123;
57 ASSERT_EQ(0, eventfd_read(fd, &value));
58 ASSERT_EQ(kInitialValue, value);
59
60 close(fd);
61
62 fd = eventfd(kInitialValue, EFD_NONBLOCK | EFD_CLOEXEC);
63 ASSERT_NE(-1, fd);
64 AssertCloseOnExec(fd, true);
65
66 value = 123;
67 ASSERT_EQ(0, eventfd_read(fd, &value));
68 ASSERT_EQ(kInitialValue, value);
69
70 close(fd);
71 }
72
TEST(eventfd,semaphore)73 TEST(eventfd, semaphore) {
74 int fd = eventfd(3, EFD_NONBLOCK | EFD_SEMAPHORE);
75 ASSERT_NE(-1, fd);
76
77 eventfd_t value = 123;
78 ASSERT_EQ(0, eventfd_read(fd, &value));
79 ASSERT_EQ(1U, value);
80
81 value = 123;
82 ASSERT_EQ(0, eventfd_read(fd, &value));
83 ASSERT_EQ(1U, value);
84
85 value = 123;
86 ASSERT_EQ(0, eventfd_read(fd, &value));
87 ASSERT_EQ(1U, value);
88
89 // The counter is cleared after the initial value decrements to 0.
90 ASSERT_EQ(-1, eventfd_read(fd, &value));
91 ASSERT_EQ(EAGAIN, errno);
92
93 close(fd);
94 }
95