| 1 | /*++ |
| 2 | |
| 3 | Copyright (c) Microsoft. All rights reserved. |
| 4 | |
| 5 | Module Name: |
| 6 | |
| 7 | EventFd.c |
| 8 | |
| 9 | Abstract: |
| 10 | |
| 11 | This file is a eventfd test. |
| 12 | |
| 13 | --*/ |
| 14 | |
| 15 | #include "lxtcommon.h" |
| 16 | #include "unittests.h" |
| 17 | #include <sys/types.h> |
| 18 | #include <sys/wait.h> |
| 19 | #include <sys/epoll.h> |
| 20 | #include <sys/eventfd.h> |
| 21 | |
| 22 | #define LXT_NAME "EventFd" |
| 23 | |
| 24 | #define DEFAULT_USLEEP 5000 |
| 25 | |
| 26 | int EventFdVariationReadWrite(PLXT_ARGS Args); |
| 27 | |
| 28 | // |
| 29 | // Global constants |
| 30 | // |
| 31 | |
| 32 | static const LXT_VARIATION g_LxtVariations[] = {{"EventFdVariation - read, write", EventFdVariationReadWrite}}; |
| 33 | |
| 34 | int EventfdTestEntry(int Argc, char* Argv[]) |
| 35 | |
| 36 | /*++ |
| 37 | --*/ |
| 38 | |
| 39 | { |
| 40 | |
| 41 | LXT_ARGS Args; |
| 42 | int Result; |
| 43 | |
| 44 | LxtCheckResult(LxtInitialize(Argc, Argv, &Args, LXT_NAME)); |
| 45 | LXT_SYNCHRONIZATION_POINT_INIT(); |
| 46 | LxtCheckResult(LxtRunVariations(&Args, g_LxtVariations, LXT_COUNT_OF(g_LxtVariations))); |
| 47 | |
| 48 | ErrorExit: |
| 49 | LXT_SYNCHRONIZATION_POINT_DESTROY(); |
| 50 | LxtUninitialize(); |
| 51 | return !LXT_SUCCESS(Result); |
| 52 | } |
| 53 | |
| 54 | int EventFdVariationReadWrite(PLXT_ARGS Args) |
| 55 | |
| 56 | /*++ |
| 57 | --*/ |
| 58 | |
| 59 | { |
| 60 | |
| 61 | pid_t ChildPid; |
| 62 | struct epoll_event EpollEvent; |
| 63 | int EpollFd; |
| 64 | int Fd; |
| 65 | int Index; |
| 66 | fd_set ReadFds; |
| 67 | int Result; |
| 68 | ssize_t Size; |
| 69 | int Status; |
| 70 | struct timeval Timeout; |
| 71 | uint64_t Value; |
| 72 | uint64_t Values[] = {1, 2, 10, 0xFFFFFFFF, 0xFFFFFFFFFFFFFFFE}; |
| 73 | struct |
| 74 | { |
| 75 | uint64_t Value; |
| 76 | char Buffer[32]; |
| 77 | } LargeValue; |
| 78 | |
| 79 | EpollFd = -1; |
| 80 | LXT_SYNCHRONIZATION_POINT_START(); |
| 81 | |
| 82 | // |
| 83 | // FIXME: Add 0 variation |
| 84 | // |
| 85 | |
| 86 | // |
| 87 | // Write the values to the event and read them back out single threaded. |
| 88 | // |
| 89 | |
| 90 | LxtCheckErrno(Fd = eventfd(0, 0)); |
| 91 | for (Index = 0; Index < LXT_COUNT_OF(Values); Index += 1) |
| 92 | { |
| 93 | |
| 94 | // |
| 95 | // Verify that the event is not ready for read (value is zero). |
| 96 | // |
| 97 | |
| 98 | memset(&Timeout, 0, sizeof(Timeout)); |
| 99 | FD_ZERO(&ReadFds); |
| 100 | FD_SET(Fd, &ReadFds); |
| 101 | LxtCheckErrno(select((Fd + 1), &ReadFds, NULL, NULL, &Timeout)); |
| 102 | LxtCheckEqual(Result, 0, "%d"); |
| 103 | |
| 104 | Value = Values[Index]; |
| 105 | Size = write(Fd, &Value, sizeof(Value)); |
| 106 | LxtCheckEqual(Size, sizeof(Value), "%lld"); |
| 107 | LxtCheckEqual(Value, Values[Index], "%llu"); |
| 108 | |
| 109 | // |
| 110 | // Verify that the event is ready for read (value is NOT zero). |
| 111 | // |
| 112 | |
| 113 | memset(&Timeout, 0, sizeof(Timeout)); |
| 114 | FD_ZERO(&ReadFds); |
| 115 | FD_SET(Fd, &ReadFds); |
| 116 | LxtCheckErrno(select((Fd + 1), &ReadFds, NULL, NULL, &Timeout)); |
| 117 | LxtCheckEqual(Result, 1, "%d"); |
| 118 | |
| 119 | // |
| 120 | // Check again to verify nothing has changed. |
| 121 | // |
| 122 | |
| 123 | memset(&Timeout, 0, sizeof(Timeout)); |
| 124 | FD_ZERO(&ReadFds); |
| 125 | FD_SET(Fd, &ReadFds); |
| 126 | LxtCheckErrno(select((Fd + 1), &ReadFds, NULL, NULL, &Timeout)); |
| 127 | LxtCheckEqual(Result, 1, "%d"); |
| 128 | |
| 129 | Value = 0; |
| 130 | Size = read(Fd, &Value, sizeof(Value)); |
| 131 | LxtCheckEqual(Size, sizeof(Value), "%lld"); |
| 132 | LxtCheckEqual(Value, Values[Index], "%llu"); |
| 133 | } |
| 134 | |
| 135 | // |
| 136 | // Verify that the event is not ready for read (value is zero). |
| 137 | // |
| 138 | |
| 139 | memset(&Timeout, 0, sizeof(Timeout)); |
| 140 | FD_ZERO(&ReadFds); |
| 141 | FD_SET(Fd, &ReadFds); |
| 142 | LxtCheckErrno(select((Fd + 1), &ReadFds, NULL, NULL, &Timeout)); |
| 143 | LxtCheckEqual(Result, 0, "%d"); |
| 144 | |
| 145 | // |
| 146 | // Write the values to the event and read them back out on another thread. |
| 147 | // |
| 148 | |
| 149 | LxtCheckErrno(ChildPid = fork()); |
| 150 | if (ChildPid == 0) |
| 151 | { |
| 152 | LxtCheckErrno(EpollFd = epoll_create(1)); |
| 153 | EpollEvent.events = EPOLLIN | EPOLLET; |
| 154 | EpollEvent.data.fd = Fd; |
| 155 | LxtCheckErrno(epoll_ctl(EpollFd, EPOLL_CTL_ADD, Fd, &EpollEvent)); |
| 156 | } |
| 157 | |
| 158 | LXT_SYNCHRONIZATION_POINT(); |
| 159 | for (Index = 0; Index < LXT_COUNT_OF(Values); Index += 1) |
| 160 | { |
| 161 | if (ChildPid == 0) |
| 162 | { |
| 163 | |
| 164 | // |
| 165 | // Ignore the first value completely and don't read the second |
| 166 | // value to verify that epoll edge-triggered behavior is working as |
| 167 | // expected. |
| 168 | // |
| 169 | |
| 170 | if (Index > 0) |
| 171 | { |
| 172 | if (Index == 1) |
| 173 | { |
| 174 | |
| 175 | // |
| 176 | // Since the first write was ignored, need to make sure |
| 177 | // that the second has completed so that the edge-triggered |
| 178 | // epoll logic works as expected instead of racing with the |
| 179 | // next write. |
| 180 | // |
| 181 | |
| 182 | LXT_SYNCHRONIZATION_POINT(); |
| 183 | } |
| 184 | |
| 185 | LxtLogInfo("Waiting from child thread..."); |
| 186 | LxtCheckErrno(epoll_wait(EpollFd, &EpollEvent, 1, -1)); |
| 187 | LxtCheckEqual(Result, 1, "%d") LxtCheckEqual(EpollEvent.data.fd, Fd, "%d"); |
| 188 | |
| 189 | // |
| 190 | // The epoll should be blocked. |
| 191 | // |
| 192 | |
| 193 | LxtCheckErrno(epoll_wait(EpollFd, &EpollEvent, 1, 0)); |
| 194 | LxtCheckEqual(Result, 0, "%d"); |
| 195 | |
| 196 | // |
| 197 | // Skip the first two values to verify epoll edge-triggered |
| 198 | // behavior and then start verifying the value data. |
| 199 | // |
| 200 | |
| 201 | if (Index > 1) |
| 202 | { |
| 203 | Value = 0; |
| 204 | Size = read(Fd, &Value, sizeof(Value)); |
| 205 | LxtCheckEqual(Size, sizeof(Value), "%lld"); |
| 206 | if (Index == 2) |
| 207 | { |
| 208 | LxtCheckEqual(Value, (Values[0] + Values[1] + Values[2]), "%llu"); |
| 209 | } |
| 210 | else |
| 211 | { |
| 212 | LxtCheckEqual(Value, Values[Index], "%llu"); |
| 213 | } |
| 214 | } |
| 215 | |
| 216 | // |
| 217 | // The epoll should still be blocked. |
| 218 | // |
| 219 | |
| 220 | LxtCheckErrno(epoll_wait(EpollFd, &EpollEvent, 1, 0)); |
| 221 | LxtCheckEqual(Result, 0, "%d") |
| 222 | } |
| 223 | } |
| 224 | else |
| 225 | { |
| 226 | LxtLogInfo("Writing 0x%llx from parent thread...", Values[Index]); |
| 227 | Value = Values[Index]; |
| 228 | Size = write(Fd, &Value, sizeof(Value)); |
| 229 | LxtCheckEqual(Size, sizeof(Value), "%lld"); |
| 230 | LxtCheckEqual(Value, Values[Index], "%llu"); |
| 231 | if (Index == 1) |
| 232 | { |
| 233 | LXT_SYNCHRONIZATION_POINT(); |
| 234 | } |
| 235 | } |
| 236 | |
| 237 | LXT_SYNCHRONIZATION_POINT(); |
| 238 | } |
| 239 | |
| 240 | if (ChildPid == 0) |
| 241 | { |
| 242 | goto ErrorExit; |
| 243 | } |
| 244 | |
| 245 | // |
| 246 | // Read and write out with a buffer larger than the default. |
| 247 | // |
| 248 | |
| 249 | memset(&LargeValue, 0, sizeof(LargeValue)); |
| 250 | LargeValue.Value = 1; |
| 251 | Size = write(Fd, &LargeValue, sizeof(LargeValue.Value)); |
| 252 | LxtCheckEqual(Size, sizeof(LargeValue.Value), "%lld"); |
| 253 | LxtCheckEqual(LargeValue.Value, 1, "%llu"); |
| 254 | |
| 255 | LargeValue.Value = 0; |
| 256 | Size = read(Fd, &LargeValue, sizeof(LargeValue.Value)); |
| 257 | LxtCheckEqual(Size, sizeof(LargeValue.Value), "%lld"); |
| 258 | LxtCheckEqual(LargeValue.Value, 1, "%llu"); |
| 259 | |
| 260 | // |
| 261 | // Check the error code for writing the maximum value. |
| 262 | // |
| 263 | |
| 264 | Value = 0xFFFFFFFFFFFFFFFF; |
| 265 | LxtCheckErrnoFailure(write(Fd, &Value, sizeof(Value)), EINVAL); |
| 266 | |
| 267 | // |
| 268 | // Check the error code for reading and writing a size of 0. |
| 269 | // |
| 270 | |
| 271 | LxtCheckErrnoFailure(read(Fd, &Value, 0), EINVAL); |
| 272 | LxtCheckErrnoFailure(write(Fd, &Value, 0), EINVAL); |
| 273 | |
| 274 | Result = LXT_RESULT_SUCCESS; |
| 275 | |
| 276 | ErrorExit: |
| 277 | if (Fd > 0) |
| 278 | { |
| 279 | close(Fd); |
| 280 | } |
| 281 | |
| 282 | if (EpollFd > 0) |
| 283 | { |
| 284 | close(EpollFd); |
| 285 | } |
| 286 | |
| 287 | LXT_SYNCHRONIZATION_POINT_END(); |
| 288 | return Result; |
| 289 | } |