| 1 | /*++ |
| 2 | |
| 3 | Copyright (c) Microsoft. All rights reserved. |
| 4 | |
| 5 | Module Name: |
| 6 | |
| 7 | madvise.c |
| 8 | |
| 9 | Abstract: |
| 10 | |
| 11 | This file is a madvise test. |
| 12 | |
| 13 | --*/ |
| 14 | |
| 15 | #include "lxtcommon.h" |
| 16 | #include "unittests.h" |
| 17 | #include <string.h> |
| 18 | #include <sys/mman.h> |
| 19 | #include <sched.h> |
| 20 | #include <signal.h> |
| 21 | #include <sys/types.h> |
| 22 | #include <sys/stat.h> |
| 23 | #include <sys/ioctl.h> |
| 24 | #include <fcntl.h> |
| 25 | #include <errno.h> |
| 26 | #include <time.h> |
| 27 | |
| 28 | #define LXT_NAME "madvise" |
| 29 | |
| 30 | int MadviseVariation2(PLXT_ARGS Args); |
| 31 | |
| 32 | int MadviseVariation3(PLXT_ARGS Args); |
| 33 | |
| 34 | int MadviseVariation4(PLXT_ARGS Args); |
| 35 | |
| 36 | int MadviseVariation5(PLXT_ARGS Args); |
| 37 | |
| 38 | // |
| 39 | // Global constants |
| 40 | // |
| 41 | |
| 42 | static const LXT_VARIATION g_LxtVariations[] = { |
| 43 | {"Anonymous mapping", MadviseVariation2}, |
| 44 | {"Anonymous mapping with fork", MadviseVariation3}, |
| 45 | {"File-backed mapping", MadviseVariation4}, |
| 46 | {"File-backed with fork", MadviseVariation5}}; |
| 47 | |
| 48 | int MadviseTestEntry(int Argc, char* Argv[]) |
| 49 | |
| 50 | /*++ |
| 51 | --*/ |
| 52 | |
| 53 | { |
| 54 | |
| 55 | LXT_ARGS Args; |
| 56 | int Result; |
| 57 | |
| 58 | LxtCheckResult(LxtInitialize(Argc, Argv, &Args, LXT_NAME)); |
| 59 | LxtCheckResult(LxtRunVariations(&Args, g_LxtVariations, LXT_COUNT_OF(g_LxtVariations))); |
| 60 | |
| 61 | ErrorExit: |
| 62 | LxtUninitialize(); |
| 63 | return !LXT_SUCCESS(Result); |
| 64 | } |
| 65 | |
| 66 | #define MADVISE_TEST_BUFFER_SIZE 0x5000 |
| 67 | |
| 68 | int MadviseRunTest(int FileId, int BufferSize, int DoFork) |
| 69 | { |
| 70 | int Result; |
| 71 | unsigned char* SharedBuffer; |
| 72 | unsigned char* PrivateBuffer; |
| 73 | unsigned char* Ptr; |
| 74 | unsigned char* EndPtr; |
| 75 | unsigned char ExpectedByte; |
| 76 | int MapAnonymousFlag; |
| 77 | int IsChild; |
| 78 | |
| 79 | // |
| 80 | // Initialize locals. |
| 81 | // |
| 82 | |
| 83 | SharedBuffer = MAP_FAILED; |
| 84 | PrivateBuffer = MAP_FAILED; |
| 85 | IsChild = 0; |
| 86 | |
| 87 | MapAnonymousFlag = 0; |
| 88 | |
| 89 | if (FileId == -1) |
| 90 | { |
| 91 | MapAnonymousFlag = MAP_ANONYMOUS; |
| 92 | } |
| 93 | |
| 94 | // |
| 95 | // Allocate the shared buffer. |
| 96 | // |
| 97 | |
| 98 | SharedBuffer = mmap(NULL, BufferSize, PROT_READ | PROT_WRITE, MAP_SHARED | MapAnonymousFlag, FileId, 0); |
| 99 | |
| 100 | if (SharedBuffer == MAP_FAILED) |
| 101 | { |
| 102 | Result = errno; |
| 103 | LxtLogError("Could not map shared! %d", Result); |
| 104 | goto cleanup; |
| 105 | } |
| 106 | |
| 107 | // |
| 108 | // Allocate the private buffer. |
| 109 | // |
| 110 | |
| 111 | PrivateBuffer = mmap(NULL, BufferSize, PROT_READ | PROT_WRITE, MAP_PRIVATE | MapAnonymousFlag, FileId, 0); |
| 112 | |
| 113 | if (PrivateBuffer == MAP_FAILED) |
| 114 | { |
| 115 | Result = errno; |
| 116 | LxtLogError("Could not map private! %d", Result); |
| 117 | goto cleanup; |
| 118 | } |
| 119 | |
| 120 | // |
| 121 | // Fill the shared buffer. |
| 122 | // |
| 123 | |
| 124 | Ptr = SharedBuffer; |
| 125 | EndPtr = Ptr + BufferSize; |
| 126 | |
| 127 | for (; Ptr < EndPtr; Ptr += 1) |
| 128 | { |
| 129 | *Ptr = 0xDE; |
| 130 | } |
| 131 | |
| 132 | // |
| 133 | // Make sure the private buffer sees the shared buffer. |
| 134 | // |
| 135 | |
| 136 | if (FileId != -1) |
| 137 | { |
| 138 | |
| 139 | Ptr = PrivateBuffer; |
| 140 | EndPtr = Ptr + BufferSize; |
| 141 | |
| 142 | for (; Ptr < EndPtr; Ptr += 1) |
| 143 | { |
| 144 | if (*Ptr != 0xDE) |
| 145 | { |
| 146 | *((volatile int*)0) = 0xDEADBEEF; |
| 147 | } |
| 148 | } |
| 149 | } |
| 150 | |
| 151 | // |
| 152 | // Fill the private buffer. |
| 153 | // |
| 154 | |
| 155 | Ptr = PrivateBuffer; |
| 156 | EndPtr = Ptr + BufferSize; |
| 157 | |
| 158 | for (; Ptr < EndPtr; Ptr += 1) |
| 159 | { |
| 160 | *Ptr = 0xCA; |
| 161 | } |
| 162 | |
| 163 | // |
| 164 | // Protect one of the two pages that will be reverted. |
| 165 | // |
| 166 | |
| 167 | Result = mprotect(PrivateBuffer + PAGE_SIZE, PAGE_SIZE, PROT_READ); |
| 168 | |
| 169 | if (Result == -1) |
| 170 | { |
| 171 | Result = errno; |
| 172 | LxtLogError("Could not set protection on buffer! %d", Result); |
| 173 | goto cleanup; |
| 174 | } |
| 175 | |
| 176 | // |
| 177 | // Fork the process if desired. |
| 178 | // |
| 179 | |
| 180 | if (DoFork) |
| 181 | { |
| 182 | |
| 183 | Result = fork(); |
| 184 | |
| 185 | if (Result == -1) |
| 186 | { |
| 187 | Result = errno; |
| 188 | LxtLogError("Could not fork the child! %d", Result); |
| 189 | goto cleanup; |
| 190 | } |
| 191 | |
| 192 | if (Result == 0) |
| 193 | { |
| 194 | IsChild = 1; |
| 195 | } |
| 196 | } |
| 197 | |
| 198 | // |
| 199 | // Revert the middle two pages back to the shared buffer. |
| 200 | // |
| 201 | |
| 202 | Result = madvise((PrivateBuffer + PAGE_SIZE), (PAGE_SIZE * 2), MADV_DONTNEED); |
| 203 | |
| 204 | if (Result == -1) |
| 205 | { |
| 206 | Result = errno; |
| 207 | LxtLogError("Could not madvise on private buffer! %d", Result); |
| 208 | goto cleanup; |
| 209 | } |
| 210 | |
| 211 | // |
| 212 | // Make sure the first page contains private data. |
| 213 | // |
| 214 | |
| 215 | Ptr = PrivateBuffer; |
| 216 | EndPtr = Ptr + PAGE_SIZE; |
| 217 | |
| 218 | for (; Ptr < EndPtr; Ptr += 1) |
| 219 | { |
| 220 | |
| 221 | if (*Ptr != 0xCA) |
| 222 | { |
| 223 | LxtLogError("Private buffer not contain expected data (1), %d", *Ptr); |
| 224 | Result = EFAULT; |
| 225 | goto cleanup; |
| 226 | } |
| 227 | } |
| 228 | |
| 229 | // |
| 230 | // Make sure the next two pages contain shared data or zeroes in the private |
| 231 | // allocation case. |
| 232 | // |
| 233 | |
| 234 | EndPtr = Ptr + (PAGE_SIZE * 2); |
| 235 | |
| 236 | for (; Ptr < EndPtr; Ptr += 1) |
| 237 | { |
| 238 | if (FileId == -1) |
| 239 | { |
| 240 | ExpectedByte = 0; |
| 241 | } |
| 242 | else |
| 243 | { |
| 244 | ExpectedByte = 0xDE; |
| 245 | } |
| 246 | |
| 247 | if (*Ptr != ExpectedByte) |
| 248 | { |
| 249 | LxtLogError("Private buffer not contain expected data (2), %d", *Ptr); |
| 250 | Result = EFAULT; |
| 251 | goto cleanup; |
| 252 | } |
| 253 | } |
| 254 | |
| 255 | // |
| 256 | // Make sure the remaining pages contain private data. |
| 257 | // |
| 258 | |
| 259 | EndPtr = PrivateBuffer + BufferSize; |
| 260 | |
| 261 | for (; Ptr < EndPtr; Ptr += 1) |
| 262 | { |
| 263 | if (*Ptr != 0xCA) |
| 264 | { |
| 265 | LxtLogError("Private buffer not contain expected data (3), %d", *Ptr); |
| 266 | Result = EFAULT; |
| 267 | goto cleanup; |
| 268 | } |
| 269 | } |
| 270 | |
| 271 | // |
| 272 | // Make sure that the shared buffer contains all shared data. |
| 273 | // |
| 274 | |
| 275 | Ptr = SharedBuffer; |
| 276 | EndPtr = Ptr + BufferSize; |
| 277 | |
| 278 | for (; Ptr < EndPtr; Ptr += 1) |
| 279 | { |
| 280 | if (*Ptr != 0xDE) |
| 281 | { |
| 282 | LxtLogError("Shared buffer not contain expected data (4), %d", *Ptr); |
| 283 | Result = EFAULT; |
| 284 | goto cleanup; |
| 285 | } |
| 286 | } |
| 287 | |
| 288 | Result = 0; |
| 289 | |
| 290 | cleanup: |
| 291 | |
| 292 | if (SharedBuffer != MAP_FAILED) |
| 293 | { |
| 294 | munmap(SharedBuffer, BufferSize); |
| 295 | } |
| 296 | |
| 297 | if (PrivateBuffer != MAP_FAILED) |
| 298 | { |
| 299 | munmap(PrivateBuffer, BufferSize); |
| 300 | } |
| 301 | |
| 302 | if (IsChild) |
| 303 | { |
| 304 | _exit(Result); |
| 305 | } |
| 306 | |
| 307 | return Result; |
| 308 | } |
| 309 | |
| 310 | int MadviseVariation2(PLXT_ARGS Args) |
| 311 | |
| 312 | /*++ |
| 313 | --*/ |
| 314 | |
| 315 | { |
| 316 | |
| 317 | int Result; |
| 318 | int FileId; |
| 319 | int BufferSize; |
| 320 | |
| 321 | // |
| 322 | // Initialize locals. |
| 323 | // |
| 324 | |
| 325 | FileId = -1; |
| 326 | BufferSize = MADVISE_TEST_BUFFER_SIZE; |
| 327 | |
| 328 | // |
| 329 | // Run the test on private memory. |
| 330 | // |
| 331 | |
| 332 | Result = MadviseRunTest(FileId, BufferSize, 0); |
| 333 | |
| 334 | if (Result != 0) |
| 335 | { |
| 336 | LxtLogError("Variation2 failed! %d", Result); |
| 337 | goto ErrorExit; |
| 338 | } |
| 339 | |
| 340 | Result = LXT_RESULT_SUCCESS; |
| 341 | |
| 342 | ErrorExit: |
| 343 | |
| 344 | if (FileId != -1) |
| 345 | { |
| 346 | close(FileId); |
| 347 | } |
| 348 | |
| 349 | return Result; |
| 350 | } |
| 351 | |
| 352 | int MadviseVariation3(PLXT_ARGS Args) |
| 353 | |
| 354 | /*++ |
| 355 | --*/ |
| 356 | |
| 357 | { |
| 358 | |
| 359 | int Result; |
| 360 | int FileId; |
| 361 | int BufferSize; |
| 362 | |
| 363 | // |
| 364 | // Initialize locals. |
| 365 | // |
| 366 | |
| 367 | FileId = -1; |
| 368 | BufferSize = MADVISE_TEST_BUFFER_SIZE; |
| 369 | |
| 370 | // |
| 371 | // Run the test on private memory with fork. |
| 372 | // |
| 373 | |
| 374 | Result = MadviseRunTest(FileId, BufferSize, 1); |
| 375 | |
| 376 | if (Result != 0) |
| 377 | { |
| 378 | LxtLogError("Variation3 failed! %d", Result); |
| 379 | goto ErrorExit; |
| 380 | } |
| 381 | |
| 382 | Result = LXT_RESULT_SUCCESS; |
| 383 | |
| 384 | ErrorExit: |
| 385 | |
| 386 | if (FileId != -1) |
| 387 | { |
| 388 | close(FileId); |
| 389 | } |
| 390 | |
| 391 | return Result; |
| 392 | } |
| 393 | |
| 394 | int MadviseVariation4(PLXT_ARGS Args) |
| 395 | |
| 396 | /*++ |
| 397 | --*/ |
| 398 | |
| 399 | { |
| 400 | |
| 401 | int Result; |
| 402 | int FileId; |
| 403 | int BufferSize; |
| 404 | unsigned int WriteData; |
| 405 | int BytesWritten; |
| 406 | int ByteIndex; |
| 407 | |
| 408 | // |
| 409 | // Initialize locals. |
| 410 | // |
| 411 | |
| 412 | FileId = -1; |
| 413 | BufferSize = MADVISE_TEST_BUFFER_SIZE; |
| 414 | |
| 415 | // |
| 416 | // Open the file and fill it to the appropriate size. |
| 417 | // |
| 418 | |
| 419 | FileId = open("/data/test/madvise_test.bin", O_RDWR | O_CREAT, S_IRWXU); |
| 420 | |
| 421 | if (FileId == -1) |
| 422 | { |
| 423 | Result = errno; |
| 424 | LxtLogError("Could not create test file! %d", Result); |
| 425 | goto ErrorExit; |
| 426 | } |
| 427 | |
| 428 | WriteData = (unsigned int)-1; |
| 429 | |
| 430 | for (ByteIndex = 0; ByteIndex < BufferSize; ByteIndex += sizeof(WriteData)) |
| 431 | { |
| 432 | |
| 433 | BytesWritten = write(FileId, &WriteData, sizeof(WriteData)); |
| 434 | |
| 435 | if (BytesWritten != sizeof(WriteData)) |
| 436 | { |
| 437 | Result = errno; |
| 438 | LxtLogError("Could not write to file! %d", Result); |
| 439 | goto ErrorExit; |
| 440 | } |
| 441 | } |
| 442 | |
| 443 | // |
| 444 | // Run the test on file-backed memory. |
| 445 | // |
| 446 | |
| 447 | Result = MadviseRunTest(FileId, BufferSize, 0); |
| 448 | |
| 449 | if (Result != 0) |
| 450 | { |
| 451 | LxtLogError("Variation4 failed! %d", Result); |
| 452 | goto ErrorExit; |
| 453 | } |
| 454 | |
| 455 | Result = LXT_RESULT_SUCCESS; |
| 456 | |
| 457 | ErrorExit: |
| 458 | |
| 459 | if (FileId != -1) |
| 460 | { |
| 461 | close(FileId); |
| 462 | } |
| 463 | |
| 464 | return Result; |
| 465 | } |
| 466 | |
| 467 | int MadviseVariation5(PLXT_ARGS Args) |
| 468 | |
| 469 | /*++ |
| 470 | --*/ |
| 471 | |
| 472 | { |
| 473 | |
| 474 | int Result; |
| 475 | int FileId; |
| 476 | int BufferSize; |
| 477 | unsigned int WriteData; |
| 478 | int BytesWritten; |
| 479 | int ByteIndex; |
| 480 | |
| 481 | // |
| 482 | // Initialize locals. |
| 483 | // |
| 484 | |
| 485 | FileId = -1; |
| 486 | BufferSize = MADVISE_TEST_BUFFER_SIZE; |
| 487 | |
| 488 | // |
| 489 | // Open the file and fill it to the appropriate size. |
| 490 | // |
| 491 | |
| 492 | FileId = open("/data/test/madvise_test.bin", O_RDWR | O_CREAT, S_IRWXU); |
| 493 | |
| 494 | if (FileId == -1) |
| 495 | { |
| 496 | Result = errno; |
| 497 | LxtLogError("Could not create test file! %d", Result); |
| 498 | goto ErrorExit; |
| 499 | } |
| 500 | |
| 501 | WriteData = (unsigned int)-1; |
| 502 | |
| 503 | for (ByteIndex = 0; ByteIndex < BufferSize; ByteIndex += sizeof(WriteData)) |
| 504 | { |
| 505 | |
| 506 | BytesWritten = write(FileId, &WriteData, sizeof(WriteData)); |
| 507 | |
| 508 | if (BytesWritten != sizeof(WriteData)) |
| 509 | { |
| 510 | Result = errno; |
| 511 | LxtLogError("Could not write to file! %d", Result); |
| 512 | goto ErrorExit; |
| 513 | } |
| 514 | } |
| 515 | |
| 516 | // |
| 517 | // Run the test on file-backed memory with fork. |
| 518 | // |
| 519 | |
| 520 | Result = MadviseRunTest(FileId, BufferSize, 1); |
| 521 | |
| 522 | if (Result != 0) |
| 523 | { |
| 524 | LxtLogError("Variation5 failed! %d", Result); |
| 525 | goto ErrorExit; |
| 526 | } |
| 527 | |
| 528 | Result = LXT_RESULT_SUCCESS; |
| 529 | |
| 530 | ErrorExit: |
| 531 | |
| 532 | if (FileId != -1) |
| 533 | { |
| 534 | close(FileId); |
| 535 | } |
| 536 | |
| 537 | return Result; |
| 538 | } |