| 1 | /* |
| 2 | * Copyright (C) 2018 Jérémie Galarneau <jeremie.galarneau@efficios.com> |
| 3 | * |
| 4 | * SPDX-License-Identifier: GPL-2.0-only |
| 5 | * |
| 6 | */ |
| 7 | |
| 8 | #include <stdlib.h> |
| 9 | #include <inttypes.h> |
| 10 | #include <stdbool.h> |
| 11 | #include <string.h> |
| 12 | #include <stdarg.h> |
| 13 | #include <tap/tap.h> |
| 14 | #include <sys/types.h> |
| 15 | #include <dirent.h> |
| 16 | #include <stdio.h> |
| 17 | #include <unistd.h> |
| 18 | #include <fcntl.h> |
| 19 | #include <sys/stat.h> |
| 20 | #include <sys/types.h> |
| 21 | |
| 22 | #include <urcu.h> |
| 23 | |
| 24 | #include <common/compat/directory-handle.hpp> |
| 25 | #include <common/compat/errno.hpp> |
| 26 | #include <common/error.hpp> |
| 27 | #include <common/fs-handle.hpp> |
| 28 | #include <common/fd-tracker/fd-tracker.hpp> |
| 29 | |
| 30 | /* For error.h */ |
| 31 | int lttng_opt_quiet = 1; |
| 32 | int lttng_opt_verbose; |
| 33 | int lttng_opt_mi; |
| 34 | |
| 35 | /* Number of TAP tests in this file */ |
| 36 | #define NUM_TESTS 61 |
| 37 | /* 3 for stdin, stdout, and stderr */ |
| 38 | #define STDIO_FD_COUNT 3 |
| 39 | #define TRACKER_FD_LIMIT 50 |
| 40 | #define TMP_DIR_PATTERN "/tmp/fd-tracker-XXXXXX" |
| 41 | #define TEST_UNLINK_DIRECTORY_NAME "unlinked_files" |
| 42 | |
| 43 | #ifdef __linux__ |
| 44 | #define SELF_FD_DIR "/proc/self/fd" |
| 45 | #else |
| 46 | /* Most Unices have /dev/fd */ |
| 47 | #define SELF_FD_DIR "/dev/fd" |
| 48 | #endif |
| 49 | |
| 50 | /* |
| 51 | * Count of fds, beyond stdin, stderr, stdout that were open |
| 52 | * at the launch of the test. This allows the test to succeed when |
| 53 | * run by automake's test runner or valgrind which both open |
| 54 | * fds behind our back. |
| 55 | */ |
| 56 | int unknown_fds_count; |
| 57 | |
| 58 | const char file_contents[] = "Bacon ipsum dolor amet jerky drumstick sirloin " |
| 59 | "strip steak venison boudin filet mignon picanha doner shoulder. " |
| 60 | "Strip steak brisket alcatra, venison beef chuck cupim pastrami. " |
| 61 | "Landjaeger tri-tip salami leberkas ball tip, ham hock chuck sausage " |
| 62 | "flank jerky cupim. Pig bacon chuck pancetta andouille."; |
| 63 | |
| 64 | static |
| 65 | void get_temporary_directories(char **_test_directory, char **_unlink_directory) |
| 66 | { |
| 67 | int ret; |
| 68 | char tmp_path_pattern[] = TMP_DIR_PATTERN; |
| 69 | char *output_dir; |
| 70 | |
| 71 | output_dir = mkdtemp(tmp_path_pattern); |
| 72 | if (!output_dir) { |
| 73 | diag("Failed to create temporary path of the form %s", |
| 74 | TMP_DIR_PATTERN); |
| 75 | abort(); |
| 76 | } |
| 77 | |
| 78 | *_test_directory = strdup(output_dir); |
| 79 | LTTNG_ASSERT(*_test_directory); |
| 80 | ret = asprintf(_unlink_directory, "%s/%s", output_dir, |
| 81 | TEST_UNLINK_DIRECTORY_NAME); |
| 82 | if (ret < 0) { |
| 83 | abort(); |
| 84 | } |
| 85 | } |
| 86 | |
| 87 | static |
| 88 | int fd_count(void) |
| 89 | { |
| 90 | DIR *dir; |
| 91 | struct dirent *entry; |
| 92 | int count = 0; |
| 93 | |
| 94 | dir = opendir(SELF_FD_DIR); |
| 95 | if (!dir) { |
| 96 | perror("# Failed to enumerate " SELF_FD_DIR " to count the number of used file descriptors"); |
| 97 | count = -1; |
| 98 | goto end; |
| 99 | } |
| 100 | |
| 101 | while ((entry = readdir(dir)) != NULL) { |
| 102 | if (!strcmp(entry->d_name, ".") || !strcmp(entry->d_name, "..")) { |
| 103 | continue; |
| 104 | } |
| 105 | count++; |
| 106 | } |
| 107 | /* Don't account for the file descriptor opened by opendir(). */ |
| 108 | count--; |
| 109 | if (closedir(dir)) { |
| 110 | perror("# Failed to close test program's " SELF_FD_DIR " directory file descriptor"); |
| 111 | } |
| 112 | end: |
| 113 | return count; |
| 114 | } |
| 115 | |
| 116 | static |
| 117 | void check_fd_count(int expected_count) |
| 118 | { |
| 119 | int count = 0; |
| 120 | |
| 121 | count = fd_count(); |
| 122 | ok(count == expected_count, "Expected %d open file descriptors (%d are open)", |
| 123 | expected_count, count); |
| 124 | } |
| 125 | |
| 126 | static |
| 127 | int noop_open(void *data, int *fds) |
| 128 | { |
| 129 | *fds = *((int *) data); |
| 130 | return 0; |
| 131 | } |
| 132 | |
| 133 | static |
| 134 | int noop_close(void *data __attribute__((unused)), |
| 135 | int *fds __attribute__((unused))) |
| 136 | { |
| 137 | return 0; |
| 138 | } |
| 139 | |
| 140 | static |
| 141 | void track_std_fds(struct fd_tracker *tracker) |
| 142 | { |
| 143 | int i; |
| 144 | struct { int fd; const char *name; } files[] = { |
| 145 | { .fd = fileno(stdin), .name = "stdin" }, |
| 146 | { .fd = fileno(stdout), .name = "stdout" }, |
| 147 | { .fd = fileno(stderr), .name = "stderr" }, |
| 148 | }; |
| 149 | |
| 150 | for (i = 0; i < sizeof(files) / sizeof(*files); i++) { |
| 151 | int out_fd, ret; |
| 152 | |
| 153 | ret = fd_tracker_open_unsuspendable_fd(tracker, &out_fd, |
| 154 | &files[i].name, 1, noop_open, &files[i].fd); |
| 155 | LTTNG_ASSERT(out_fd == files[i].fd); |
| 156 | |
| 157 | ok(ret == 0, "Track unsuspendable fd %d (%s)", files[i].fd, |
| 158 | files[i].name); |
| 159 | } |
| 160 | } |
| 161 | |
| 162 | static |
| 163 | void untrack_std_fds(struct fd_tracker *tracker) |
| 164 | { |
| 165 | int i; |
| 166 | struct { int fd; const char *name; } files[] = { |
| 167 | { .fd = fileno(stdin), .name = "stdin" }, |
| 168 | { .fd = fileno(stdout), .name = "stdout" }, |
| 169 | { .fd = fileno(stderr), .name = "stderr" }, |
| 170 | }; |
| 171 | |
| 172 | for (i = 0; i < sizeof(files) / sizeof(*files); i++) { |
| 173 | int fd = files[i].fd; |
| 174 | int ret = fd_tracker_close_unsuspendable_fd(tracker, |
| 175 | &files[i].fd, 1, noop_close, NULL); |
| 176 | |
| 177 | ok(ret == 0, "Untrack unsuspendable fd %d (%s)", fd, |
| 178 | files[i].name); |
| 179 | } |
| 180 | } |
| 181 | |
| 182 | /* |
| 183 | * Basic test opening and closing three unsuspendable fds. |
| 184 | */ |
| 185 | static |
| 186 | void test_unsuspendable_basic(void) |
| 187 | { |
| 188 | int ret; |
| 189 | struct fd_tracker *tracker; |
| 190 | char *test_directory = NULL, *unlinked_files_directory = NULL; |
| 191 | |
| 192 | get_temporary_directories(&test_directory, &unlinked_files_directory); |
| 193 | |
| 194 | tracker = fd_tracker_create(unlinked_files_directory, TRACKER_FD_LIMIT); |
| 195 | ok(tracker, "Created an fd tracker with a limit of %d simulateously opened file descriptors", |
| 196 | TRACKER_FD_LIMIT); |
| 197 | if (!tracker) { |
| 198 | goto end; |
| 199 | } |
| 200 | |
| 201 | track_std_fds(tracker); |
| 202 | untrack_std_fds(tracker); |
| 203 | |
| 204 | fd_tracker_destroy(tracker); |
| 205 | ret = rmdir(test_directory); |
| 206 | ok(ret == 0, "Test directory is empty"); |
| 207 | end: |
| 208 | free(test_directory); |
| 209 | free(unlinked_files_directory); |
| 210 | } |
| 211 | |
| 212 | static |
| 213 | int error_open(void *data, int *fds __attribute__((unused))) |
| 214 | { |
| 215 | return *((int *) data); |
| 216 | } |
| 217 | |
| 218 | static |
| 219 | int error_close(void *data, int *fds __attribute__((unused))) |
| 220 | { |
| 221 | return *((int *) data); |
| 222 | } |
| 223 | |
| 224 | /* |
| 225 | * Validate that user callback return values are returned to the |
| 226 | * caller of the fd tracker. |
| 227 | */ |
| 228 | static |
| 229 | void test_unsuspendable_cb_return(void) |
| 230 | { |
| 231 | int ret, stdout_fd = fileno(stdout), out_fd = 42; |
| 232 | struct fd_tracker *tracker; |
| 233 | int expected_error = -ENETDOWN; |
| 234 | char *test_directory = NULL, *unlinked_files_directory = NULL; |
| 235 | |
| 236 | get_temporary_directories(&test_directory, &unlinked_files_directory); |
| 237 | |
| 238 | tracker = fd_tracker_create(test_directory, TRACKER_FD_LIMIT); |
| 239 | LTTNG_ASSERT(tracker); |
| 240 | |
| 241 | /* The error_open callback should fail and return 'expected_error'. */ |
| 242 | ret = fd_tracker_open_unsuspendable_fd(tracker, &out_fd, |
| 243 | NULL, 1, error_open, &expected_error); |
| 244 | ok(ret == expected_error, "fd_tracker_open_unsuspendable_fd() forwards the user callback's error code"); |
| 245 | ok(out_fd == 42, "Output fd parameter is unaffected on error of fd_tracker_open_unsuspendable_fd()"); |
| 246 | |
| 247 | /* |
| 248 | * Track a valid fd since we don't want the tracker to fail with an |
| 249 | * invalid fd error for this test. |
| 250 | */ |
| 251 | ret = fd_tracker_open_unsuspendable_fd(tracker, &out_fd, |
| 252 | NULL, 1, noop_open, &stdout_fd); |
| 253 | ok(out_fd == stdout_fd, "fd_tracker_open_unsuspendable_fd() sets the output fd parameter to the newly-tracked fd's value"); |
| 254 | LTTNG_ASSERT(!ret); |
| 255 | |
| 256 | ret = fd_tracker_close_unsuspendable_fd(tracker, |
| 257 | &stdout_fd, 1, error_close, &expected_error); |
| 258 | ok(ret == expected_error, "fd_tracker_close_unsuspendable_fd() forwards the user callback's error code"); |
| 259 | ret = fd_tracker_close_unsuspendable_fd(tracker, |
| 260 | &stdout_fd, 1, noop_close, &expected_error); |
| 261 | LTTNG_ASSERT(!ret); |
| 262 | |
| 263 | fd_tracker_destroy(tracker); |
| 264 | ret = rmdir(test_directory); |
| 265 | ok(ret == 0, "Test directory is empty"); |
| 266 | free(test_directory); |
| 267 | free(unlinked_files_directory); |
| 268 | } |
| 269 | |
| 270 | /* |
| 271 | * Validate that the tracker refuses to track two identical unsuspendable |
| 272 | * file descriptors. |
| 273 | */ |
| 274 | static |
| 275 | void test_unsuspendable_duplicate(void) |
| 276 | { |
| 277 | int ret, stdout_fd = fileno(stdout), out_fd; |
| 278 | struct fd_tracker *tracker; |
| 279 | char *test_directory = NULL, *unlinked_files_directory = NULL; |
| 280 | |
| 281 | get_temporary_directories(&test_directory, &unlinked_files_directory); |
| 282 | |
| 283 | tracker = fd_tracker_create(unlinked_files_directory, TRACKER_FD_LIMIT); |
| 284 | LTTNG_ASSERT(tracker); |
| 285 | |
| 286 | ret = fd_tracker_open_unsuspendable_fd(tracker, &out_fd, |
| 287 | NULL, 1, noop_open, &stdout_fd); |
| 288 | LTTNG_ASSERT(!ret); |
| 289 | ret = fd_tracker_open_unsuspendable_fd(tracker, &out_fd, |
| 290 | NULL, 1, noop_open, &stdout_fd); |
| 291 | ok(ret == -EEXIST, "EEXIST reported on open of an already tracked file descriptor"); |
| 292 | |
| 293 | ret = fd_tracker_close_unsuspendable_fd(tracker, |
| 294 | &stdout_fd, 1, noop_close, NULL); |
| 295 | LTTNG_ASSERT(!ret); |
| 296 | |
| 297 | fd_tracker_destroy(tracker); |
| 298 | ret = rmdir(test_directory); |
| 299 | ok(ret == 0, "Test directory is empty"); |
| 300 | free(test_directory); |
| 301 | free(unlinked_files_directory); |
| 302 | } |
| 303 | |
| 304 | static |
| 305 | int open_pipes(void *data __attribute__((unused)), int *out_fds) |
| 306 | { |
| 307 | unsigned int i; |
| 308 | const unsigned int pipe_count = TRACKER_FD_LIMIT / 2; |
| 309 | |
| 310 | for (i = 0; i < pipe_count; i++) { |
| 311 | int ret = pipe(&out_fds[i * 2]); |
| 312 | |
| 313 | if (ret) { |
| 314 | return -errno; |
| 315 | } |
| 316 | } |
| 317 | return 0; |
| 318 | } |
| 319 | |
| 320 | static |
| 321 | int close_pipes(void *data __attribute__((unused)), int *fds) |
| 322 | { |
| 323 | int i; |
| 324 | int *pipes = fds; |
| 325 | |
| 326 | for (i = 0; i < TRACKER_FD_LIMIT; i++) { |
| 327 | int ret = close(pipes[i]); |
| 328 | |
| 329 | if (ret) { |
| 330 | return -errno; |
| 331 | } |
| 332 | } |
| 333 | return 0; |
| 334 | } |
| 335 | |
| 336 | /* |
| 337 | * Validate that the tracker enforces the open file descriptor limit |
| 338 | * when unsuspendable file descriptors are being opened. |
| 339 | */ |
| 340 | static |
| 341 | void test_unsuspendable_limit(void) |
| 342 | { |
| 343 | struct fd_tracker *tracker; |
| 344 | int ret, stdout_fd = fileno(stdout), out_fd; |
| 345 | int fds[TRACKER_FD_LIMIT]; |
| 346 | char *test_directory = NULL, *unlinked_files_directory = NULL; |
| 347 | |
| 348 | get_temporary_directories(&test_directory, &unlinked_files_directory); |
| 349 | |
| 350 | /* This test assumes TRACKER_FD_LIMIT is a multiple of 2. */ |
| 351 | LTTNG_ASSERT((TRACKER_FD_LIMIT % 2 == 0) && TRACKER_FD_LIMIT); |
| 352 | |
| 353 | tracker = fd_tracker_create(unlinked_files_directory, TRACKER_FD_LIMIT); |
| 354 | LTTNG_ASSERT(tracker); |
| 355 | |
| 356 | ret = fd_tracker_open_unsuspendable_fd(tracker, fds, |
| 357 | NULL, TRACKER_FD_LIMIT, open_pipes, NULL); |
| 358 | ok(ret == 0, "File descriptor tracker allowed the user to meet its limit with unsuspendable file descriptors (%d)", |
| 359 | TRACKER_FD_LIMIT); |
| 360 | |
| 361 | ret = fd_tracker_open_unsuspendable_fd(tracker, &out_fd, |
| 362 | NULL, 1, noop_open, &stdout_fd); |
| 363 | ok(ret == -EMFILE, "EMFILE reported when exceeding the file descriptor limit while opening an unsuspendable fd"); |
| 364 | |
| 365 | ret = fd_tracker_close_unsuspendable_fd(tracker, |
| 366 | fds, TRACKER_FD_LIMIT, close_pipes, NULL); |
| 367 | LTTNG_ASSERT(!ret); |
| 368 | |
| 369 | fd_tracker_destroy(tracker); |
| 370 | ret = rmdir(test_directory); |
| 371 | ok(ret == 0, "Test directory is empty"); |
| 372 | free(test_directory); |
| 373 | free(unlinked_files_directory); |
| 374 | } |
| 375 | |
| 376 | /* |
| 377 | * Validate that the tracker refuses to track two identical unsuspendable |
| 378 | * file descriptors. |
| 379 | */ |
| 380 | static |
| 381 | void test_unsuspendable_close_untracked(void) |
| 382 | { |
| 383 | int ret, stdout_fd = fileno(stdout), unknown_fds[2], out_fd; |
| 384 | struct fd_tracker *tracker; |
| 385 | char *test_directory = NULL, *unlinked_files_directory = NULL; |
| 386 | |
| 387 | get_temporary_directories(&test_directory, &unlinked_files_directory); |
| 388 | |
| 389 | tracker = fd_tracker_create(unlinked_files_directory, TRACKER_FD_LIMIT); |
| 390 | if (!tracker) { |
| 391 | goto end;; |
| 392 | } |
| 393 | |
| 394 | ret = pipe(unknown_fds); |
| 395 | LTTNG_ASSERT(!ret); |
| 396 | ret = close(unknown_fds[0]); |
| 397 | LTTNG_ASSERT(ret == 0); |
| 398 | ret = close(unknown_fds[1]); |
| 399 | LTTNG_ASSERT(ret == 0); |
| 400 | |
| 401 | ret = fd_tracker_open_unsuspendable_fd(tracker, &out_fd, |
| 402 | NULL, 1, noop_open, &stdout_fd); |
| 403 | LTTNG_ASSERT(!ret); |
| 404 | |
| 405 | ret = fd_tracker_close_unsuspendable_fd(tracker, |
| 406 | unknown_fds, 1, noop_close, NULL); |
| 407 | ok(ret == -EINVAL, "EINVAL reported on close of an untracked file descriptor"); |
| 408 | |
| 409 | ret = fd_tracker_close_unsuspendable_fd(tracker, |
| 410 | &stdout_fd, 1, noop_close, NULL); |
| 411 | LTTNG_ASSERT(!ret); |
| 412 | |
| 413 | fd_tracker_destroy(tracker); |
| 414 | ret = rmdir(test_directory); |
| 415 | ok(ret == 0, "Test directory is empty"); |
| 416 | end: |
| 417 | free(test_directory); |
| 418 | free(unlinked_files_directory); |
| 419 | } |
| 420 | |
| 421 | static int open_files(struct fd_tracker *tracker, |
| 422 | struct lttng_directory_handle *directory, |
| 423 | unsigned int count, |
| 424 | struct fs_handle **handles, |
| 425 | char **file_paths) |
| 426 | { |
| 427 | int ret = 0; |
| 428 | unsigned int i; |
| 429 | |
| 430 | for (i = 0; i < count; i++) { |
| 431 | int p_ret; |
| 432 | char *file_path; |
| 433 | struct fs_handle *handle; |
| 434 | mode_t mode = S_IWUSR | S_IRUSR; |
| 435 | |
| 436 | p_ret = asprintf(&file_path, "file-%u", i); |
| 437 | LTTNG_ASSERT(p_ret >= 0); |
| 438 | file_paths[i] = file_path; |
| 439 | |
| 440 | handle = fd_tracker_open_fs_handle(tracker, directory, file_path, |
| 441 | O_RDWR | O_CREAT, &mode); |
| 442 | if (!handle) { |
| 443 | ret = -1; |
| 444 | break; |
| 445 | } |
| 446 | handles[i] = handle; |
| 447 | } |
| 448 | return ret; |
| 449 | } |
| 450 | |
| 451 | static int open_same_file(struct fd_tracker *tracker, |
| 452 | struct lttng_directory_handle *directory, |
| 453 | const char *file, |
| 454 | unsigned int count, |
| 455 | struct fs_handle **handles) |
| 456 | { |
| 457 | int ret = 0; |
| 458 | unsigned int i; |
| 459 | |
| 460 | for (i = 0; i < count; i++) { |
| 461 | struct fs_handle *handle; |
| 462 | mode_t mode = S_IWUSR | S_IRUSR; |
| 463 | |
| 464 | handle = fd_tracker_open_fs_handle(tracker, directory, file, |
| 465 | O_RDWR | O_CREAT, &mode); |
| 466 | if (!handle) { |
| 467 | ret = -1; |
| 468 | break; |
| 469 | } |
| 470 | handles[i] = handle; |
| 471 | } |
| 472 | return ret; |
| 473 | } |
| 474 | |
| 475 | static |
| 476 | int cleanup_files(struct fd_tracker *tracker __attribute__((unused)), |
| 477 | const char *dir __attribute__((unused)), |
| 478 | unsigned int count, struct fs_handle **handles, |
| 479 | char **file_paths) |
| 480 | { |
| 481 | int ret = 0; |
| 482 | unsigned int i; |
| 483 | |
| 484 | for (i = 0; i < count; i++) { |
| 485 | char *file_path = file_paths[i]; |
| 486 | |
| 487 | if (!file_path) { |
| 488 | break; |
| 489 | } |
| 490 | if (fs_handle_unlink(handles[i])) { |
| 491 | diag("Failed to unlink fs_handle to file %s", file_path); |
| 492 | ret = -1; |
| 493 | } |
| 494 | if (fs_handle_close(handles[i])) { |
| 495 | diag("Failed to close fs_handle to file %s", file_path); |
| 496 | ret = -1; |
| 497 | } |
| 498 | free(file_path); |
| 499 | } |
| 500 | return ret; |
| 501 | } |
| 502 | |
| 503 | static |
| 504 | void test_suspendable_limit(void) |
| 505 | { |
| 506 | int ret; |
| 507 | const int files_to_create = TRACKER_FD_LIMIT * 10; |
| 508 | struct fd_tracker *tracker; |
| 509 | char *test_directory = NULL, *unlinked_files_directory = NULL; |
| 510 | char *output_files[files_to_create]; |
| 511 | struct fs_handle *handles[files_to_create]; |
| 512 | struct lttng_directory_handle *dir_handle = NULL; |
| 513 | int dir_handle_fd_count; |
| 514 | |
| 515 | memset(output_files, 0, sizeof(output_files)); |
| 516 | memset(handles, 0, sizeof(handles)); |
| 517 | |
| 518 | get_temporary_directories(&test_directory, &unlinked_files_directory); |
| 519 | |
| 520 | tracker = fd_tracker_create(unlinked_files_directory, TRACKER_FD_LIMIT); |
| 521 | if (!tracker) { |
| 522 | goto end; |
| 523 | } |
| 524 | |
| 525 | dir_handle = lttng_directory_handle_create(test_directory); |
| 526 | LTTNG_ASSERT(dir_handle); |
| 527 | dir_handle_fd_count = !!lttng_directory_handle_uses_fd(dir_handle); |
| 528 | |
| 529 | ret = open_files(tracker, dir_handle, files_to_create, handles, |
| 530 | output_files); |
| 531 | ok(!ret, "Created %d files with a limit of %d simultaneously-opened file descriptor", |
| 532 | files_to_create, TRACKER_FD_LIMIT); |
| 533 | check_fd_count(TRACKER_FD_LIMIT + STDIO_FD_COUNT + unknown_fds_count + |
| 534 | dir_handle_fd_count); |
| 535 | |
| 536 | ret = cleanup_files(tracker, test_directory, files_to_create, handles, |
| 537 | output_files); |
| 538 | ok(!ret, "Close all opened filesystem handles"); |
| 539 | ret = rmdir(test_directory); |
| 540 | ok(ret == 0, "Test directory is empty"); |
| 541 | fd_tracker_destroy(tracker); |
| 542 | lttng_directory_handle_put(dir_handle); |
| 543 | end: |
| 544 | free(test_directory); |
| 545 | free(unlinked_files_directory); |
| 546 | } |
| 547 | |
| 548 | static |
| 549 | void test_mixed_limit(void) |
| 550 | { |
| 551 | int ret; |
| 552 | const int files_to_create = TRACKER_FD_LIMIT; |
| 553 | struct fd_tracker *tracker; |
| 554 | char *test_directory = NULL, *unlinked_files_directory = NULL; |
| 555 | char *output_files[files_to_create]; |
| 556 | struct fs_handle *handles[files_to_create]; |
| 557 | struct lttng_directory_handle *dir_handle = NULL; |
| 558 | int dir_handle_fd_count; |
| 559 | |
| 560 | memset(output_files, 0, sizeof(output_files)); |
| 561 | memset(handles, 0, sizeof(handles)); |
| 562 | |
| 563 | get_temporary_directories(&test_directory, &unlinked_files_directory); |
| 564 | |
| 565 | tracker = fd_tracker_create(unlinked_files_directory, TRACKER_FD_LIMIT); |
| 566 | if (!tracker) { |
| 567 | goto end; |
| 568 | } |
| 569 | |
| 570 | dir_handle = lttng_directory_handle_create(test_directory); |
| 571 | LTTNG_ASSERT(dir_handle); |
| 572 | dir_handle_fd_count = !!lttng_directory_handle_uses_fd(dir_handle); |
| 573 | |
| 574 | ret = open_files(tracker, dir_handle, files_to_create, handles, |
| 575 | output_files); |
| 576 | ok(!ret, "Created %d files with a limit of %d simultaneously-opened file descriptor", |
| 577 | files_to_create, TRACKER_FD_LIMIT); |
| 578 | diag("Check file descriptor count after opening %u files", files_to_create); |
| 579 | check_fd_count(TRACKER_FD_LIMIT + STDIO_FD_COUNT + unknown_fds_count + |
| 580 | dir_handle_fd_count); |
| 581 | |
| 582 | /* |
| 583 | * Open unsuspendable fds (stdin, stdout, stderr) and verify that the fd |
| 584 | * cap is still respected. |
| 585 | */ |
| 586 | diag("Check file descriptor count after adding %d unsuspendable fds", |
| 587 | STDIO_FD_COUNT); |
| 588 | track_std_fds(tracker); |
| 589 | check_fd_count(TRACKER_FD_LIMIT + unknown_fds_count + |
| 590 | dir_handle_fd_count); |
| 591 | diag("Untrack unsuspendable file descriptors"); |
| 592 | untrack_std_fds(tracker); |
| 593 | check_fd_count(TRACKER_FD_LIMIT + unknown_fds_count + |
| 594 | dir_handle_fd_count); |
| 595 | |
| 596 | ret = cleanup_files(tracker, test_directory, files_to_create, handles, |
| 597 | output_files); |
| 598 | ok(!ret, "Close all opened filesystem handles"); |
| 599 | ret = rmdir(test_directory); |
| 600 | ok(ret == 0, "Test directory is empty"); |
| 601 | fd_tracker_destroy(tracker); |
| 602 | lttng_directory_handle_put(dir_handle); |
| 603 | end: |
| 604 | free(test_directory); |
| 605 | free(unlinked_files_directory); |
| 606 | } |
| 607 | |
| 608 | /* |
| 609 | * Open more files than allowed by the fd tracker's cap and write, |
| 610 | * byte-by-byte, and in round-robin, a string. The goal is to force |
| 611 | * the fd tracker to suspend and resume the fs_handles often and |
| 612 | * verify that the fd cap is always respected. |
| 613 | * |
| 614 | * The content of the files is also verified at the end. |
| 615 | */ |
| 616 | static |
| 617 | void test_suspendable_restore(void) |
| 618 | { |
| 619 | int ret; |
| 620 | const int files_to_create = TRACKER_FD_LIMIT * 10; |
| 621 | struct fd_tracker *tracker; |
| 622 | char *output_files[files_to_create]; |
| 623 | struct fs_handle *handles[files_to_create]; |
| 624 | size_t content_index; |
| 625 | int handle_index; |
| 626 | bool write_success = true; |
| 627 | bool fd_cap_respected = true; |
| 628 | bool content_ok = true; |
| 629 | struct lttng_directory_handle *dir_handle = NULL; |
| 630 | int dir_handle_fd_count; |
| 631 | char *test_directory = NULL, *unlinked_files_directory = NULL; |
| 632 | |
| 633 | memset(output_files, 0, sizeof(output_files)); |
| 634 | memset(handles, 0, sizeof(handles)); |
| 635 | |
| 636 | get_temporary_directories(&test_directory, &unlinked_files_directory); |
| 637 | |
| 638 | tracker = fd_tracker_create(unlinked_files_directory, TRACKER_FD_LIMIT); |
| 639 | if (!tracker) { |
| 640 | goto end; |
| 641 | } |
| 642 | |
| 643 | dir_handle = lttng_directory_handle_create(test_directory); |
| 644 | LTTNG_ASSERT(dir_handle); |
| 645 | dir_handle_fd_count = !!lttng_directory_handle_uses_fd(dir_handle); |
| 646 | |
| 647 | ret = open_files(tracker, dir_handle, files_to_create, handles, |
| 648 | output_files); |
| 649 | ok(!ret, "Created %d files with a limit of %d simultaneously-opened file descriptor", |
| 650 | files_to_create, TRACKER_FD_LIMIT); |
| 651 | diag("Check file descriptor count after opening %u files", files_to_create); |
| 652 | check_fd_count(TRACKER_FD_LIMIT + STDIO_FD_COUNT + unknown_fds_count + |
| 653 | dir_handle_fd_count); |
| 654 | |
| 655 | for (content_index = 0; content_index < sizeof(file_contents); content_index++) { |
| 656 | for (handle_index = 0; handle_index < files_to_create; handle_index++) { |
| 657 | int fd; |
| 658 | struct fs_handle *handle = handles[handle_index]; |
| 659 | const char *path = output_files[handle_index]; |
| 660 | |
| 661 | fd = fs_handle_get_fd(handle); |
| 662 | if (fd < 0) { |
| 663 | write_success = false; |
| 664 | diag("Failed to restore fs_handle to %s", |
| 665 | path); |
| 666 | goto skip_write; |
| 667 | } |
| 668 | |
| 669 | do { |
| 670 | ret = write(fd, file_contents + content_index, 1); |
| 671 | } while (ret < 0 && errno == EINTR); |
| 672 | |
| 673 | if (ret != 1) { |
| 674 | write_success = false; |
| 675 | PERROR("write() to %s failed", path); |
| 676 | goto skip_write; |
| 677 | } |
| 678 | |
| 679 | if (fd_count() > (TRACKER_FD_LIMIT + STDIO_FD_COUNT + |
| 680 | unknown_fds_count + |
| 681 | dir_handle_fd_count)) { |
| 682 | fd_cap_respected = false; |
| 683 | } |
| 684 | |
| 685 | fs_handle_put_fd(handle); |
| 686 | } |
| 687 | } |
| 688 | skip_write: |
| 689 | ok(write_success, "Wrote reference string to %d files", |
| 690 | files_to_create); |
| 691 | ok(fd_cap_respected, "FD tracker enforced the file descriptor cap"); |
| 692 | |
| 693 | /* Validate the contents of the files. */ |
| 694 | for (handle_index = 0; handle_index < files_to_create; handle_index++) { |
| 695 | struct stat fd_stat; |
| 696 | const char *path = output_files[handle_index]; |
| 697 | char read_buf[sizeof(file_contents)]; |
| 698 | char *read_pos; |
| 699 | size_t to_read = sizeof(read_buf); |
| 700 | int fd; |
| 701 | |
| 702 | fd = lttng_directory_handle_open_file( |
| 703 | dir_handle, path, O_RDONLY, 0); |
| 704 | LTTNG_ASSERT(fd >= 0); |
| 705 | ret = fstat(fd, &fd_stat); |
| 706 | LTTNG_ASSERT(!ret); |
| 707 | if (fd_stat.st_size != sizeof(file_contents)) { |
| 708 | diag("Content size of file %s doesn't match, got %" PRId64 ", expected %zu", |
| 709 | path, (int64_t) fd_stat.st_size, |
| 710 | sizeof(file_contents)); |
| 711 | content_ok = false; |
| 712 | (void) close(fd); |
| 713 | break; |
| 714 | } |
| 715 | |
| 716 | read_pos = read_buf; |
| 717 | do { |
| 718 | ret = read(fd, read_pos, to_read); |
| 719 | if (ret > 0) { |
| 720 | to_read -= ret; |
| 721 | read_pos += ret; |
| 722 | } |
| 723 | } while (to_read && (ret < 0 && errno == EINTR)); |
| 724 | if (ret < 0) { |
| 725 | content_ok = false; |
| 726 | PERROR("Failed to read file %s", path); |
| 727 | (void) close(fd); |
| 728 | break; |
| 729 | } |
| 730 | |
| 731 | if (strcmp(file_contents, read_buf)) { |
| 732 | content_ok = false; |
| 733 | diag("File content doesn't match the expectated string"); |
| 734 | (void) close(fd); |
| 735 | break; |
| 736 | } |
| 737 | (void) close(fd); |
| 738 | } |
| 739 | ok(content_ok, "Files contain the expected content"); |
| 740 | ret = cleanup_files(tracker, test_directory, files_to_create, handles, |
| 741 | output_files); |
| 742 | ok(!ret, "Close all opened filesystem handles"); |
| 743 | ret = rmdir(test_directory); |
| 744 | ok(ret == 0, "Test directory is empty"); |
| 745 | fd_tracker_destroy(tracker); |
| 746 | lttng_directory_handle_put(dir_handle); |
| 747 | end: |
| 748 | free(test_directory); |
| 749 | free(unlinked_files_directory); |
| 750 | } |
| 751 | |
| 752 | static |
| 753 | void test_unlink(void) |
| 754 | { |
| 755 | int ret; |
| 756 | struct fd_tracker *tracker; |
| 757 | const int handles_to_open = 2; |
| 758 | struct fs_handle *handles[handles_to_open]; |
| 759 | struct fs_handle *new_handle = NULL; |
| 760 | struct stat statbuf; |
| 761 | struct lttng_directory_handle *dir_handle = NULL; |
| 762 | const char file_name[] = "my_file"; |
| 763 | char *test_directory = NULL, *unlinked_files_directory = NULL; |
| 764 | char *unlinked_file_zero = NULL, *unlinked_file_one = NULL; |
| 765 | int fd; |
| 766 | |
| 767 | get_temporary_directories(&test_directory, &unlinked_files_directory); |
| 768 | ret = asprintf(&unlinked_file_zero, "%s/%u", unlinked_files_directory, |
| 769 | 0); |
| 770 | LTTNG_ASSERT(ret > 0); |
| 771 | ret = asprintf(&unlinked_file_one, "%s/%u", unlinked_files_directory, |
| 772 | 1); |
| 773 | LTTNG_ASSERT(ret > 0); |
| 774 | |
| 775 | tracker = fd_tracker_create(unlinked_files_directory, 1); |
| 776 | if (!tracker) { |
| 777 | goto end; |
| 778 | } |
| 779 | |
| 780 | dir_handle = lttng_directory_handle_create(test_directory); |
| 781 | LTTNG_ASSERT(dir_handle); |
| 782 | |
| 783 | /* Open two handles to the same file. */ |
| 784 | ret = open_same_file(tracker, dir_handle, file_name, handles_to_open, |
| 785 | handles); |
| 786 | ok(!ret, "Successfully opened %i handles to %s/%s", handles_to_open, |
| 787 | test_directory, file_name); |
| 788 | if (ret) { |
| 789 | goto end; |
| 790 | } |
| 791 | |
| 792 | /* |
| 793 | * Unlinking the first handle should cause the file to be renamed |
| 794 | * to '0'. |
| 795 | */ |
| 796 | ret = fs_handle_unlink(handles[0]); |
| 797 | ok(!ret, "Successfully unlinked the first handle to %s/%s", |
| 798 | test_directory, file_name); |
| 799 | |
| 800 | /* |
| 801 | * The original file should no longer exist on the file system, and a |
| 802 | * new file named '0' should exist. |
| 803 | */ |
| 804 | ok(lttng_directory_handle_stat(dir_handle, file_name, &statbuf) == -1 && |
| 805 | errno == ENOENT, |
| 806 | "%s no longer present on file system after unlink", |
| 807 | file_name); |
| 808 | ok(lttng_directory_handle_stat( |
| 809 | dir_handle, unlinked_file_zero, &statbuf) == 0, |
| 810 | "%s exists on file system after unlink", |
| 811 | unlinked_file_zero); |
| 812 | |
| 813 | /* |
| 814 | * It should be possible to use the file descriptors of both handles. |
| 815 | * Since only one file descriptor can be opened at once, this should |
| 816 | * force the fd_tracker to suspend and restore the handles. |
| 817 | */ |
| 818 | fd = fs_handle_get_fd(handles[0]); |
| 819 | ok(fd >= 0, "Got fd from first handle"); |
| 820 | |
| 821 | fd = fs_handle_get_fd(handles[1]); |
| 822 | ok (fd < 0, "fd tracker does not allow two fds to be used at once"); |
| 823 | |
| 824 | fs_handle_put_fd(handles[0]); |
| 825 | fd = fs_handle_get_fd(handles[1]); |
| 826 | ok(fd >= 0, "Got fd from second handle"); |
| 827 | fs_handle_put_fd(handles[1]); |
| 828 | |
| 829 | /* The second unlink should fail with -ENOENT. */ |
| 830 | ret = fs_handle_unlink(handles[1]); |
| 831 | ok(ret == -ENOENT, |
| 832 | "ENOENT is reported when attempting to unlink the second handle to %s/%s", |
| 833 | test_directory, file_name); |
| 834 | |
| 835 | /* |
| 836 | * Opening a new handle to 'my_file' should succeed. |
| 837 | */ |
| 838 | ret = open_same_file(tracker, dir_handle, file_name, 1, &new_handle); |
| 839 | ok(!ret, "Successfully opened a new handle to previously unlinked file %s/%s", |
| 840 | test_directory, file_name); |
| 841 | LTTNG_ASSERT(new_handle); |
| 842 | |
| 843 | /* |
| 844 | * Unlinking the new handle should cause the file to be renamed |
| 845 | * to '1' since '0' already exists. |
| 846 | */ |
| 847 | ret = fs_handle_unlink(new_handle); |
| 848 | ok(!ret, "Successfully unlinked the new handle handle to %s/%s", |
| 849 | test_directory, file_name); |
| 850 | ok(stat(unlinked_file_one, &statbuf) == 0, |
| 851 | "%s exists on file system after unlink", |
| 852 | unlinked_file_one); |
| 853 | |
| 854 | ret = fs_handle_close(handles[0]); |
| 855 | ok(!ret, "Successfully closed the first handle"); |
| 856 | ret = fs_handle_close(handles[1]); |
| 857 | ok(!ret, "Successfully closed the second handle"); |
| 858 | ret = fs_handle_close(new_handle); |
| 859 | ok(!ret, "Successfully closed the third handle"); |
| 860 | |
| 861 | ok(lttng_directory_handle_stat(dir_handle, file_name, &statbuf) == -1 && |
| 862 | errno == ENOENT, |
| 863 | "%s no longer present on file system after handle close", |
| 864 | file_name); |
| 865 | ok(lttng_directory_handle_stat( |
| 866 | dir_handle, unlinked_file_zero, &statbuf) == -1 && |
| 867 | errno == ENOENT, |
| 868 | "%s no longer present on file system after handle close", |
| 869 | unlinked_file_zero); |
| 870 | ok(lttng_directory_handle_stat(dir_handle, unlinked_file_one, |
| 871 | &statbuf) == -1 && |
| 872 | errno == ENOENT, |
| 873 | "%s no longer present on file system after handle close", |
| 874 | unlinked_file_one); |
| 875 | |
| 876 | ret = rmdir(test_directory); |
| 877 | ok(ret == 0, "Test directory is empty"); |
| 878 | end: |
| 879 | fd_tracker_destroy(tracker); |
| 880 | free(test_directory); |
| 881 | free(unlinked_files_directory); |
| 882 | free(unlinked_file_zero); |
| 883 | free(unlinked_file_one); |
| 884 | lttng_directory_handle_put(dir_handle); |
| 885 | } |
| 886 | |
| 887 | int main(void) |
| 888 | { |
| 889 | plan_tests(NUM_TESTS); |
| 890 | diag("File descriptor tracker unit tests"); |
| 891 | |
| 892 | rcu_register_thread(); |
| 893 | |
| 894 | unknown_fds_count = fd_count() - STDIO_FD_COUNT; |
| 895 | LTTNG_ASSERT(unknown_fds_count >= 0); |
| 896 | |
| 897 | diag("Unsuspendable - basic"); |
| 898 | test_unsuspendable_basic(); |
| 899 | diag("Unsuspendable - callback return values"); |
| 900 | test_unsuspendable_cb_return(); |
| 901 | diag("Unsuspendable - duplicate file descriptors"); |
| 902 | test_unsuspendable_duplicate(); |
| 903 | diag("Unsuspendable - closing an untracked file descriptor"); |
| 904 | test_unsuspendable_close_untracked(); |
| 905 | diag("Unsuspendable - check that file descriptor limit is enforced"); |
| 906 | test_unsuspendable_limit(); |
| 907 | |
| 908 | diag("Suspendable - check that file descriptor limit is enforced"); |
| 909 | test_suspendable_limit(); |
| 910 | diag("Suspendable - restoration test"); |
| 911 | test_suspendable_restore(); |
| 912 | |
| 913 | diag("Mixed - check that file descriptor limit is enforced"); |
| 914 | test_mixed_limit(); |
| 915 | |
| 916 | diag("Suspendable - Unlinking test"); |
| 917 | test_unlink(); |
| 918 | |
| 919 | rcu_barrier(); |
| 920 | rcu_unregister_thread(); |
| 921 | return exit_status(); |
| 922 | } |