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/*
* 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 <errno.h>
#include <fcntl.h>
#include <gtest/gtest.h>
#include <sys/eventfd.h>
#include "utils.h"
TEST(eventfd, smoke) {
constexpr unsigned int kInitialValue = 2;
int fd = eventfd(kInitialValue, EFD_NONBLOCK);
ASSERT_NE(-1, fd);
eventfd_t value = 123;
ASSERT_EQ(0, eventfd_read(fd, &value));
ASSERT_EQ(kInitialValue, value);
// Reading clears the counter.
ASSERT_EQ(-1, eventfd_read(fd, &value));
ASSERT_EQ(EAGAIN, errno);
// Values written are added until the next read.
ASSERT_EQ(0, eventfd_write(fd, 1));
ASSERT_EQ(0, eventfd_write(fd, 1));
ASSERT_EQ(0, eventfd_write(fd, 1));
ASSERT_EQ(0, eventfd_read(fd, &value));
ASSERT_EQ(3U, value);
close(fd);
}
TEST(eventfd, cloexec) {
constexpr unsigned int kInitialValue = 2;
int fd = eventfd(kInitialValue, EFD_CLOEXEC);
ASSERT_NE(-1, fd);
AssertCloseOnExec(fd, true);
eventfd_t value = 123;
ASSERT_EQ(0, eventfd_read(fd, &value));
ASSERT_EQ(kInitialValue, value);
close(fd);
fd = eventfd(kInitialValue, EFD_NONBLOCK | EFD_CLOEXEC);
ASSERT_NE(-1, fd);
AssertCloseOnExec(fd, true);
value = 123;
ASSERT_EQ(0, eventfd_read(fd, &value));
ASSERT_EQ(kInitialValue, value);
close(fd);
}
TEST(eventfd, semaphore) {
int fd = eventfd(3, EFD_NONBLOCK | EFD_SEMAPHORE);
ASSERT_NE(-1, fd);
eventfd_t value = 123;
ASSERT_EQ(0, eventfd_read(fd, &value));
ASSERT_EQ(1U, value);
value = 123;
ASSERT_EQ(0, eventfd_read(fd, &value));
ASSERT_EQ(1U, value);
value = 123;
ASSERT_EQ(0, eventfd_read(fd, &value));
ASSERT_EQ(1U, value);
// The counter is cleared after the initial value decrements to 0.
ASSERT_EQ(-1, eventfd_read(fd, &value));
ASSERT_EQ(EAGAIN, errno);
close(fd);
}
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