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 #if defined(__BIONIC__) // Android's prebuilt gcc's header files don't include <sys/eventfd.h>. 23 #include <sys/eventfd.h> 24 #else 25 // Include the necessary components of sys/eventfd.h right here. 26 #include <stdint.h> 27 28 typedef uint64_t eventfd_t; 29 30 __BEGIN_DECLS 31 extern int eventfd(int, int); 32 extern int eventfd_read(int, eventfd_t*); 33 extern int eventfd_write(int, eventfd_t); 34 __END_DECLS 35 #endif 36 37 TEST(eventfd, smoke) { 38 unsigned int initial_value = 2; 39 int fd = eventfd(initial_value, O_NONBLOCK); 40 ASSERT_NE(fd, -1); 41 42 eventfd_t value = 123; 43 ASSERT_EQ(0, eventfd_read(fd, &value)); 44 ASSERT_EQ(initial_value, value); 45 46 // Reading clears the counter. 47 ASSERT_EQ(-1, eventfd_read(fd, &value)); 48 ASSERT_EQ(EAGAIN, errno); 49 50 // Values written are added until the next read. 51 ASSERT_EQ(0, eventfd_write(fd, 1)); 52 ASSERT_EQ(0, eventfd_write(fd, 1)); 53 ASSERT_EQ(0, eventfd_write(fd, 1)); 54 55 ASSERT_EQ(0, eventfd_read(fd, &value)); 56 ASSERT_EQ(3U, value); 57 58 close(fd); 59 } 60
