95 lines
2.3 KiB
C++
95 lines
2.3 KiB
C++
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/*
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* Copyright (C) 2013 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <errno.h>
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#include <fcntl.h>
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#include <gtest/gtest.h>
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#include <sys/eventfd.h>
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#include "utils.h"
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TEST(eventfd, smoke) {
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constexpr unsigned int kInitialValue = 2;
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int fd = eventfd(kInitialValue, EFD_NONBLOCK);
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ASSERT_NE(-1, fd);
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eventfd_t value = 123;
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ASSERT_EQ(0, eventfd_read(fd, &value));
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ASSERT_EQ(kInitialValue, value);
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// Reading clears the counter.
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ASSERT_EQ(-1, eventfd_read(fd, &value));
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ASSERT_EQ(EAGAIN, errno);
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// Values written are added until the next read.
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ASSERT_EQ(0, eventfd_write(fd, 1));
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ASSERT_EQ(0, eventfd_write(fd, 1));
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ASSERT_EQ(0, eventfd_write(fd, 1));
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ASSERT_EQ(0, eventfd_read(fd, &value));
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ASSERT_EQ(3U, value);
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close(fd);
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}
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TEST(eventfd, cloexec) {
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constexpr unsigned int kInitialValue = 2;
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int fd = eventfd(kInitialValue, EFD_CLOEXEC);
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ASSERT_NE(-1, fd);
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ASSERT_TRUE(CloseOnExec(fd));
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eventfd_t value = 123;
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ASSERT_EQ(0, eventfd_read(fd, &value));
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ASSERT_EQ(kInitialValue, value);
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close(fd);
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fd = eventfd(kInitialValue, EFD_NONBLOCK | EFD_CLOEXEC);
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ASSERT_NE(-1, fd);
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ASSERT_TRUE(CloseOnExec(fd));
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value = 123;
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ASSERT_EQ(0, eventfd_read(fd, &value));
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ASSERT_EQ(kInitialValue, value);
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close(fd);
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}
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TEST(eventfd, semaphore) {
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int fd = eventfd(3, EFD_NONBLOCK | EFD_SEMAPHORE);
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ASSERT_NE(-1, fd);
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eventfd_t value = 123;
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ASSERT_EQ(0, eventfd_read(fd, &value));
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ASSERT_EQ(1U, value);
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value = 123;
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ASSERT_EQ(0, eventfd_read(fd, &value));
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ASSERT_EQ(1U, value);
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value = 123;
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ASSERT_EQ(0, eventfd_read(fd, &value));
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ASSERT_EQ(1U, value);
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// The counter is cleared after the initial value decrements to 0.
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ASSERT_EQ(-1, eventfd_read(fd, &value));
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ASSERT_EQ(EAGAIN, errno);
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close(fd);
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}
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