Commit | Line | Data |
---|---|---|
9ca3e8a2 | 1 | /* |
9d16b343 | 2 | * Copyright (C) 2018 Jérémie Galarneau <jeremie.galarneau@efficios.com> |
9ca3e8a2 | 3 | * |
9d16b343 | 4 | * SPDX-License-Identifier: GPL-2.0-only |
9ca3e8a2 | 5 | * |
9ca3e8a2 JG |
6 | */ |
7 | ||
8 | #include <stdlib.h> | |
9 | #include <inttypes.h> | |
10 | #include <stdbool.h> | |
11 | #include <assert.h> | |
12 | #include <string.h> | |
13 | #include <stdarg.h> | |
14 | #include <tap/tap.h> | |
15 | #include <sys/types.h> | |
16 | #include <dirent.h> | |
17 | #include <stdio.h> | |
9ca3e8a2 JG |
18 | #include <unistd.h> |
19 | #include <fcntl.h> | |
20 | #include <sys/stat.h> | |
f0faf175 | 21 | #include <sys/types.h> |
9ca3e8a2 JG |
22 | |
23 | #include <urcu.h> | |
24 | ||
f7c3ffd7 | 25 | #include <common/compat/directory-handle.h> |
edf4b93e | 26 | #include <common/compat/errno.h> |
9ca3e8a2 | 27 | #include <common/error.h> |
f7c3ffd7 | 28 | #include <common/fd-tracker/fd-tracker.h> |
9ca3e8a2 JG |
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 */ | |
f7c3ffd7 | 36 | #define NUM_TESTS 61 |
9ca3e8a2 JG |
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" | |
f7c3ffd7 | 41 | #define TEST_UNLINK_DIRECTORY_NAME "unlinked_files" |
9ca3e8a2 | 42 | |
d89ce8ce MJ |
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 | ||
9ca3e8a2 JG |
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 | ||
f8e06d39 | 64 | static |
f7c3ffd7 JG |
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 | assert(0); | |
76 | } | |
77 | ||
78 | *_test_directory = strdup(output_dir); | |
79 | assert(*_test_directory); | |
80 | ret = asprintf(_unlink_directory, "%s/%s", output_dir, | |
81 | TEST_UNLINK_DIRECTORY_NAME); | |
82 | if (ret < 0) { | |
83 | assert(0); | |
84 | } | |
85 | } | |
86 | ||
3ea695b4 | 87 | static |
9ca3e8a2 JG |
88 | int fd_count(void) |
89 | { | |
90 | DIR *dir; | |
91 | struct dirent *entry; | |
58cd7196 | 92 | int count = 0; |
9ca3e8a2 | 93 | |
d89ce8ce | 94 | dir = opendir(SELF_FD_DIR); |
9ca3e8a2 | 95 | if (!dir) { |
d89ce8ce | 96 | perror("# Failed to enumerate " SELF_FD_DIR " to count the number of used file descriptors"); |
58cd7196 | 97 | count = -1; |
9ca3e8a2 JG |
98 | goto end; |
99 | } | |
100 | ||
101 | while ((entry = readdir(dir)) != NULL) { | |
102 | if (!strcmp(entry->d_name, ".") || !strcmp(entry->d_name, "..")) { | |
103 | continue; | |
104 | } | |
58cd7196 | 105 | count++; |
9ca3e8a2 JG |
106 | } |
107 | /* Don't account for the file descriptor opened by opendir(). */ | |
58cd7196 | 108 | count--; |
e0efb2c8 | 109 | if (closedir(dir)) { |
d89ce8ce | 110 | perror("# Failed to close test program's " SELF_FD_DIR " directory file descriptor"); |
e0efb2c8 | 111 | } |
9ca3e8a2 JG |
112 | end: |
113 | return count; | |
114 | } | |
115 | ||
116 | static | |
117 | void check_fd_count(int expected_count) | |
118 | { | |
58cd7196 | 119 | int count = 0; |
9ca3e8a2 | 120 | |
58cd7196 | 121 | count = fd_count(); |
9ca3e8a2 JG |
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 | { | |
58cd7196 | 129 | *fds = *((int *) data); |
9ca3e8a2 JG |
130 | return 0; |
131 | } | |
132 | ||
133 | static | |
134 | int noop_close(void *data, int *fds) | |
135 | { | |
136 | return 0; | |
137 | } | |
138 | ||
139 | static | |
140 | void track_std_fds(struct fd_tracker *tracker) | |
141 | { | |
142 | int i; | |
58cd7196 | 143 | struct { int fd; const char *name; } files[] = { |
9ca3e8a2 JG |
144 | { .fd = fileno(stdin), .name = "stdin" }, |
145 | { .fd = fileno(stdout), .name = "stdout" }, | |
146 | { .fd = fileno(stderr), .name = "stderr" }, | |
147 | }; | |
148 | ||
149 | for (i = 0; i < sizeof(files) / sizeof(*files); i++) { | |
150 | int out_fd, ret; | |
151 | ||
152 | ret = fd_tracker_open_unsuspendable_fd(tracker, &out_fd, | |
153 | &files[i].name, 1, noop_open, &files[i].fd); | |
154 | assert(out_fd == files[i].fd); | |
155 | ||
156 | ok(ret == 0, "Track unsuspendable fd %d (%s)", files[i].fd, | |
157 | files[i].name); | |
158 | } | |
159 | } | |
160 | ||
161 | static | |
162 | void untrack_std_fds(struct fd_tracker *tracker) | |
163 | { | |
164 | int i; | |
58cd7196 | 165 | struct { int fd; const char *name; } files[] = { |
9ca3e8a2 JG |
166 | { .fd = fileno(stdin), .name = "stdin" }, |
167 | { .fd = fileno(stdout), .name = "stdout" }, | |
168 | { .fd = fileno(stderr), .name = "stderr" }, | |
169 | }; | |
170 | unsigned int fds_set_to_minus_1 = 0; | |
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 | fds_set_to_minus_1 += (files[i].fd == -1); | |
180 | } | |
181 | } | |
182 | ||
183 | /* | |
184 | * Basic test opening and closing three unsuspendable fds. | |
185 | */ | |
186 | static | |
187 | void test_unsuspendable_basic(void) | |
188 | { | |
f7c3ffd7 | 189 | int ret; |
9ca3e8a2 | 190 | struct fd_tracker *tracker; |
f7c3ffd7 JG |
191 | char *test_directory = NULL, *unlinked_files_directory = NULL; |
192 | ||
193 | get_temporary_directories(&test_directory, &unlinked_files_directory); | |
9ca3e8a2 | 194 | |
58cd7196 | 195 | tracker = fd_tracker_create(unlinked_files_directory, TRACKER_FD_LIMIT); |
9ca3e8a2 JG |
196 | ok(tracker, "Created an fd tracker with a limit of %d simulateously opened file descriptors", |
197 | TRACKER_FD_LIMIT); | |
198 | if (!tracker) { | |
f6bef966 | 199 | goto end; |
9ca3e8a2 JG |
200 | } |
201 | ||
202 | track_std_fds(tracker); | |
203 | untrack_std_fds(tracker); | |
204 | ||
205 | fd_tracker_destroy(tracker); | |
f7c3ffd7 JG |
206 | ret = rmdir(test_directory); |
207 | ok(ret == 0, "Test directory is empty"); | |
f6bef966 | 208 | end: |
f7c3ffd7 JG |
209 | free(test_directory); |
210 | free(unlinked_files_directory); | |
9ca3e8a2 JG |
211 | } |
212 | ||
213 | static | |
214 | int error_open(void *data, int *fds) | |
215 | { | |
216 | return *((int *) data); | |
217 | } | |
218 | ||
219 | static | |
220 | int error_close(void *data, int *fds) | |
221 | { | |
222 | return *((int *) data); | |
223 | } | |
224 | ||
225 | /* | |
226 | * Validate that user callback return values are returned to the | |
227 | * caller of the fd tracker. | |
228 | */ | |
229 | static | |
230 | void test_unsuspendable_cb_return(void) | |
231 | { | |
232 | int ret, stdout_fd = fileno(stdout), out_fd = 42; | |
233 | struct fd_tracker *tracker; | |
234 | int expected_error = -ENETDOWN; | |
f7c3ffd7 | 235 | char *test_directory = NULL, *unlinked_files_directory = NULL; |
9ca3e8a2 | 236 | |
f7c3ffd7 JG |
237 | get_temporary_directories(&test_directory, &unlinked_files_directory); |
238 | ||
58cd7196 | 239 | tracker = fd_tracker_create(test_directory, TRACKER_FD_LIMIT); |
9ca3e8a2 JG |
240 | assert(tracker); |
241 | ||
242 | /* The error_open callback should fail and return 'expected_error'. */ | |
243 | ret = fd_tracker_open_unsuspendable_fd(tracker, &out_fd, | |
244 | NULL, 1, error_open, &expected_error); | |
245 | ok(ret == expected_error, "fd_tracker_open_unsuspendable_fd() forwards the user callback's error code"); | |
246 | ok(out_fd == 42, "Output fd parameter is unaffected on error of fd_tracker_open_unsuspendable_fd()"); | |
247 | ||
248 | /* | |
249 | * Track a valid fd since we don't want the tracker to fail with an | |
250 | * invalid fd error for this test. | |
251 | */ | |
252 | ret = fd_tracker_open_unsuspendable_fd(tracker, &out_fd, | |
253 | NULL, 1, noop_open, &stdout_fd); | |
254 | ok(out_fd == stdout_fd, "fd_tracker_open_unsuspendable_fd() sets the output fd parameter to the newly-tracked fd's value"); | |
255 | assert(!ret); | |
256 | ||
257 | ret = fd_tracker_close_unsuspendable_fd(tracker, | |
258 | &stdout_fd, 1, error_close, &expected_error); | |
259 | ok(ret == expected_error, "fd_tracker_close_unsuspendable_fd() forwards the user callback's error code"); | |
260 | ret = fd_tracker_close_unsuspendable_fd(tracker, | |
261 | &stdout_fd, 1, noop_close, &expected_error); | |
262 | assert(!ret); | |
263 | ||
264 | fd_tracker_destroy(tracker); | |
f7c3ffd7 JG |
265 | ret = rmdir(test_directory); |
266 | ok(ret == 0, "Test directory is empty"); | |
267 | free(test_directory); | |
268 | free(unlinked_files_directory); | |
9ca3e8a2 JG |
269 | } |
270 | ||
271 | /* | |
272 | * Validate that the tracker refuses to track two identical unsuspendable | |
273 | * file descriptors. | |
274 | */ | |
275 | static | |
276 | void test_unsuspendable_duplicate(void) | |
277 | { | |
278 | int ret, stdout_fd = fileno(stdout), out_fd; | |
279 | struct fd_tracker *tracker; | |
f7c3ffd7 JG |
280 | char *test_directory = NULL, *unlinked_files_directory = NULL; |
281 | ||
282 | get_temporary_directories(&test_directory, &unlinked_files_directory); | |
9ca3e8a2 | 283 | |
58cd7196 | 284 | tracker = fd_tracker_create(unlinked_files_directory, TRACKER_FD_LIMIT); |
9ca3e8a2 JG |
285 | assert(tracker); |
286 | ||
287 | ret = fd_tracker_open_unsuspendable_fd(tracker, &out_fd, | |
288 | NULL, 1, noop_open, &stdout_fd); | |
289 | assert(!ret); | |
290 | ret = fd_tracker_open_unsuspendable_fd(tracker, &out_fd, | |
291 | NULL, 1, noop_open, &stdout_fd); | |
292 | ok(ret == -EEXIST, "EEXIST reported on open of an already tracked file descriptor"); | |
293 | ||
294 | ret = fd_tracker_close_unsuspendable_fd(tracker, | |
295 | &stdout_fd, 1, noop_close, NULL); | |
296 | assert(!ret); | |
297 | ||
298 | fd_tracker_destroy(tracker); | |
f7c3ffd7 JG |
299 | ret = rmdir(test_directory); |
300 | ok(ret == 0, "Test directory is empty"); | |
301 | free(test_directory); | |
302 | free(unlinked_files_directory); | |
9ca3e8a2 JG |
303 | } |
304 | ||
305 | static | |
306 | int open_pipes(void *data, int *out_fds) | |
307 | { | |
308 | unsigned int i; | |
309 | const unsigned int pipe_count = TRACKER_FD_LIMIT / 2; | |
310 | ||
311 | for (i = 0; i < pipe_count; i++) { | |
312 | int ret = pipe(&out_fds[i * 2]); | |
313 | ||
314 | if (ret) { | |
315 | return -errno; | |
316 | } | |
317 | } | |
318 | return 0; | |
319 | } | |
320 | ||
321 | static | |
322 | int close_pipes(void *data, int *fds) | |
323 | { | |
324 | int i; | |
325 | int *pipes = fds; | |
326 | ||
327 | for (i = 0; i < TRACKER_FD_LIMIT; i++) { | |
328 | int ret = close(pipes[i]); | |
329 | ||
330 | if (ret) { | |
331 | return -errno; | |
332 | } | |
333 | } | |
334 | return 0; | |
335 | } | |
336 | ||
337 | /* | |
338 | * Validate that the tracker enforces the open file descriptor limit | |
ea05fafd | 339 | * when unsuspendable file descriptors are being opened. |
9ca3e8a2 JG |
340 | */ |
341 | static | |
342 | void test_unsuspendable_limit(void) | |
343 | { | |
344 | struct fd_tracker *tracker; | |
345 | int ret, stdout_fd = fileno(stdout), out_fd; | |
346 | int fds[TRACKER_FD_LIMIT]; | |
f7c3ffd7 JG |
347 | char *test_directory = NULL, *unlinked_files_directory = NULL; |
348 | ||
349 | get_temporary_directories(&test_directory, &unlinked_files_directory); | |
9ca3e8a2 JG |
350 | |
351 | /* This test assumes TRACKER_FD_LIMIT is a multiple of 2. */ | |
352 | assert((TRACKER_FD_LIMIT % 2 == 0) && TRACKER_FD_LIMIT); | |
353 | ||
58cd7196 | 354 | tracker = fd_tracker_create(unlinked_files_directory, TRACKER_FD_LIMIT); |
9ca3e8a2 JG |
355 | assert(tracker); |
356 | ||
357 | ret = fd_tracker_open_unsuspendable_fd(tracker, fds, | |
358 | NULL, TRACKER_FD_LIMIT, open_pipes, NULL); | |
ea05fafd | 359 | ok(ret == 0, "File descriptor tracker allowed the user to meet its limit with unsuspendable file descriptors (%d)", |
9ca3e8a2 JG |
360 | TRACKER_FD_LIMIT); |
361 | ||
362 | ret = fd_tracker_open_unsuspendable_fd(tracker, &out_fd, | |
363 | NULL, 1, noop_open, &stdout_fd); | |
364 | ok(ret == -EMFILE, "EMFILE reported when exceeding the file descriptor limit while opening an unsuspendable fd"); | |
365 | ||
366 | ret = fd_tracker_close_unsuspendable_fd(tracker, | |
367 | fds, TRACKER_FD_LIMIT, close_pipes, NULL); | |
368 | assert(!ret); | |
369 | ||
370 | fd_tracker_destroy(tracker); | |
f7c3ffd7 JG |
371 | ret = rmdir(test_directory); |
372 | ok(ret == 0, "Test directory is empty"); | |
373 | free(test_directory); | |
374 | free(unlinked_files_directory); | |
9ca3e8a2 JG |
375 | } |
376 | ||
377 | /* | |
378 | * Validate that the tracker refuses to track two identical unsuspendable | |
379 | * file descriptors. | |
380 | */ | |
381 | static | |
382 | void test_unsuspendable_close_untracked(void) | |
383 | { | |
384 | int ret, stdout_fd = fileno(stdout), unknown_fds[2], out_fd; | |
385 | struct fd_tracker *tracker; | |
f7c3ffd7 | 386 | char *test_directory = NULL, *unlinked_files_directory = NULL; |
9ca3e8a2 | 387 | |
f7c3ffd7 JG |
388 | get_temporary_directories(&test_directory, &unlinked_files_directory); |
389 | ||
58cd7196 | 390 | tracker = fd_tracker_create(unlinked_files_directory, TRACKER_FD_LIMIT); |
9ca3e8a2 | 391 | if (!tracker) { |
f6bef966 | 392 | goto end;; |
9ca3e8a2 JG |
393 | } |
394 | ||
395 | ret = pipe(unknown_fds); | |
396 | assert(!ret); | |
620b0c36 FD |
397 | ret = close(unknown_fds[0]); |
398 | assert(ret == 0); | |
399 | ret = close(unknown_fds[1]); | |
400 | assert(ret == 0); | |
9ca3e8a2 JG |
401 | |
402 | ret = fd_tracker_open_unsuspendable_fd(tracker, &out_fd, | |
403 | NULL, 1, noop_open, &stdout_fd); | |
404 | assert(!ret); | |
405 | ||
406 | ret = fd_tracker_close_unsuspendable_fd(tracker, | |
407 | unknown_fds, 1, noop_close, NULL); | |
408 | ok(ret == -EINVAL, "EINVAL reported on close of an untracked file descriptor"); | |
409 | ||
410 | ret = fd_tracker_close_unsuspendable_fd(tracker, | |
411 | &stdout_fd, 1, noop_close, NULL); | |
412 | assert(!ret); | |
413 | ||
414 | fd_tracker_destroy(tracker); | |
f7c3ffd7 JG |
415 | ret = rmdir(test_directory); |
416 | ok(ret == 0, "Test directory is empty"); | |
f6bef966 | 417 | end: |
f7c3ffd7 JG |
418 | free(test_directory); |
419 | free(unlinked_files_directory); | |
9ca3e8a2 JG |
420 | } |
421 | ||
f7c3ffd7 JG |
422 | static int open_files(struct fd_tracker *tracker, |
423 | struct lttng_directory_handle *directory, | |
424 | unsigned int count, | |
425 | struct fs_handle **handles, | |
426 | char **file_paths) | |
9ca3e8a2 JG |
427 | { |
428 | int ret = 0; | |
429 | unsigned int i; | |
430 | ||
431 | for (i = 0; i < count; i++) { | |
f0faf175 | 432 | int p_ret; |
58cd7196 | 433 | char *file_path; |
9ca3e8a2 JG |
434 | struct fs_handle *handle; |
435 | mode_t mode = S_IWUSR | S_IRUSR; | |
436 | ||
f7c3ffd7 | 437 | p_ret = asprintf(&file_path, "file-%u", i); |
f0faf175 | 438 | assert(p_ret >= 0); |
58cd7196 | 439 | file_paths[i] = file_path; |
9ca3e8a2 | 440 | |
f7c3ffd7 | 441 | handle = fd_tracker_open_fs_handle(tracker, directory, file_path, |
9ca3e8a2 JG |
442 | O_RDWR | O_CREAT, &mode); |
443 | if (!handle) { | |
444 | ret = -1; | |
445 | break; | |
446 | } | |
447 | handles[i] = handle; | |
448 | } | |
449 | return ret; | |
450 | } | |
451 | ||
f7c3ffd7 JG |
452 | static int open_same_file(struct fd_tracker *tracker, |
453 | struct lttng_directory_handle *directory, | |
454 | const char *file, | |
455 | unsigned int count, | |
456 | struct fs_handle **handles) | |
f0faf175 JG |
457 | { |
458 | int ret = 0; | |
459 | unsigned int i; | |
460 | ||
461 | for (i = 0; i < count; i++) { | |
462 | struct fs_handle *handle; | |
463 | mode_t mode = S_IWUSR | S_IRUSR; | |
464 | ||
f7c3ffd7 | 465 | handle = fd_tracker_open_fs_handle(tracker, directory, file, |
f0faf175 JG |
466 | O_RDWR | O_CREAT, &mode); |
467 | if (!handle) { | |
468 | ret = -1; | |
469 | break; | |
470 | } | |
471 | handles[i] = handle; | |
472 | } | |
473 | return ret; | |
474 | } | |
475 | ||
9ca3e8a2 JG |
476 | static |
477 | int cleanup_files(struct fd_tracker *tracker, const char *dir, | |
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 | } | |
f7c3ffd7 JG |
490 | if (fs_handle_unlink(handles[i])) { |
491 | diag("Failed to unlink fs_handle to file %s", file_path); | |
492 | ret = -1; | |
493 | } | |
58cd7196 | 494 | if (fs_handle_close(handles[i])) { |
f7c3ffd7 | 495 | diag("Failed to close fs_handle to file %s", file_path); |
9ca3e8a2 JG |
496 | ret = -1; |
497 | } | |
f7c3ffd7 | 498 | free(file_path); |
9ca3e8a2 JG |
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; | |
f7c3ffd7 | 509 | char *test_directory = NULL, *unlinked_files_directory = NULL; |
9ca3e8a2 JG |
510 | char *output_files[files_to_create]; |
511 | struct fs_handle *handles[files_to_create]; | |
f7c3ffd7 JG |
512 | struct lttng_directory_handle *dir_handle = NULL; |
513 | int dir_handle_fd_count; | |
9ca3e8a2 JG |
514 | |
515 | memset(output_files, 0, sizeof(output_files)); | |
516 | memset(handles, 0, sizeof(handles)); | |
517 | ||
f7c3ffd7 JG |
518 | get_temporary_directories(&test_directory, &unlinked_files_directory); |
519 | ||
58cd7196 | 520 | tracker = fd_tracker_create(unlinked_files_directory, TRACKER_FD_LIMIT); |
9ca3e8a2 | 521 | if (!tracker) { |
f6bef966 | 522 | goto end; |
9ca3e8a2 JG |
523 | } |
524 | ||
f7c3ffd7 JG |
525 | dir_handle = lttng_directory_handle_create(test_directory); |
526 | assert(dir_handle); | |
527 | dir_handle_fd_count = !!lttng_directory_handle_uses_fd(dir_handle); | |
9ca3e8a2 | 528 | |
f7c3ffd7 | 529 | ret = open_files(tracker, dir_handle, files_to_create, handles, |
9ca3e8a2 JG |
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); | |
f7c3ffd7 JG |
533 | check_fd_count(TRACKER_FD_LIMIT + STDIO_FD_COUNT + unknown_fds_count + |
534 | dir_handle_fd_count); | |
9ca3e8a2 | 535 | |
f7c3ffd7 | 536 | ret = cleanup_files(tracker, test_directory, files_to_create, handles, |
9ca3e8a2 JG |
537 | output_files); |
538 | ok(!ret, "Close all opened filesystem handles"); | |
f7c3ffd7 JG |
539 | ret = rmdir(test_directory); |
540 | ok(ret == 0, "Test directory is empty"); | |
9ca3e8a2 | 541 | fd_tracker_destroy(tracker); |
f7c3ffd7 | 542 | lttng_directory_handle_put(dir_handle); |
f6bef966 | 543 | end: |
f7c3ffd7 JG |
544 | free(test_directory); |
545 | free(unlinked_files_directory); | |
9ca3e8a2 JG |
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; | |
f7c3ffd7 | 554 | char *test_directory = NULL, *unlinked_files_directory = NULL; |
9ca3e8a2 JG |
555 | char *output_files[files_to_create]; |
556 | struct fs_handle *handles[files_to_create]; | |
f7c3ffd7 JG |
557 | struct lttng_directory_handle *dir_handle = NULL; |
558 | int dir_handle_fd_count; | |
9ca3e8a2 JG |
559 | |
560 | memset(output_files, 0, sizeof(output_files)); | |
561 | memset(handles, 0, sizeof(handles)); | |
562 | ||
f7c3ffd7 JG |
563 | get_temporary_directories(&test_directory, &unlinked_files_directory); |
564 | ||
565 | tracker = fd_tracker_create(unlinked_files_directory, TRACKER_FD_LIMIT); | |
9ca3e8a2 | 566 | if (!tracker) { |
f6bef966 | 567 | goto end; |
9ca3e8a2 JG |
568 | } |
569 | ||
f7c3ffd7 JG |
570 | dir_handle = lttng_directory_handle_create(test_directory); |
571 | assert(dir_handle); | |
572 | dir_handle_fd_count = !!lttng_directory_handle_uses_fd(dir_handle); | |
9ca3e8a2 | 573 | |
f7c3ffd7 | 574 | ret = open_files(tracker, dir_handle, files_to_create, handles, |
9ca3e8a2 JG |
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); | |
f7c3ffd7 JG |
579 | check_fd_count(TRACKER_FD_LIMIT + STDIO_FD_COUNT + unknown_fds_count + |
580 | dir_handle_fd_count); | |
9ca3e8a2 JG |
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); | |
f7c3ffd7 JG |
589 | check_fd_count(TRACKER_FD_LIMIT + unknown_fds_count + |
590 | dir_handle_fd_count); | |
9ca3e8a2 JG |
591 | diag("Untrack unsuspendable file descriptors"); |
592 | untrack_std_fds(tracker); | |
f7c3ffd7 JG |
593 | check_fd_count(TRACKER_FD_LIMIT + unknown_fds_count + |
594 | dir_handle_fd_count); | |
9ca3e8a2 | 595 | |
f7c3ffd7 | 596 | ret = cleanup_files(tracker, test_directory, files_to_create, handles, |
9ca3e8a2 JG |
597 | output_files); |
598 | ok(!ret, "Close all opened filesystem handles"); | |
f7c3ffd7 JG |
599 | ret = rmdir(test_directory); |
600 | ok(ret == 0, "Test directory is empty"); | |
9ca3e8a2 | 601 | fd_tracker_destroy(tracker); |
f7c3ffd7 | 602 | lttng_directory_handle_put(dir_handle); |
f6bef966 | 603 | end: |
f7c3ffd7 JG |
604 | free(test_directory); |
605 | free(unlinked_files_directory); | |
9ca3e8a2 JG |
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; | |
9ca3e8a2 JG |
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; | |
f7c3ffd7 JG |
629 | struct lttng_directory_handle *dir_handle = NULL; |
630 | int dir_handle_fd_count; | |
631 | char *test_directory = NULL, *unlinked_files_directory = NULL; | |
9ca3e8a2 JG |
632 | |
633 | memset(output_files, 0, sizeof(output_files)); | |
634 | memset(handles, 0, sizeof(handles)); | |
635 | ||
f7c3ffd7 JG |
636 | get_temporary_directories(&test_directory, &unlinked_files_directory); |
637 | ||
58cd7196 | 638 | tracker = fd_tracker_create(unlinked_files_directory, TRACKER_FD_LIMIT); |
9ca3e8a2 | 639 | if (!tracker) { |
f6bef966 | 640 | goto end; |
9ca3e8a2 JG |
641 | } |
642 | ||
f7c3ffd7 JG |
643 | dir_handle = lttng_directory_handle_create(test_directory); |
644 | assert(dir_handle); | |
645 | dir_handle_fd_count = !!lttng_directory_handle_uses_fd(dir_handle); | |
9ca3e8a2 | 646 | |
f7c3ffd7 | 647 | ret = open_files(tracker, dir_handle, files_to_create, handles, |
9ca3e8a2 JG |
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); | |
f7c3ffd7 JG |
652 | check_fd_count(TRACKER_FD_LIMIT + STDIO_FD_COUNT + unknown_fds_count + |
653 | dir_handle_fd_count); | |
9ca3e8a2 JG |
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; | |
58cd7196 JG |
664 | diag("Failed to restore fs_handle to %s", |
665 | path); | |
9ca3e8a2 JG |
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; | |
58cd7196 | 675 | PERROR("write() to %s failed", path); |
9ca3e8a2 JG |
676 | goto skip_write; |
677 | } | |
678 | ||
f7c3ffd7 JG |
679 | if (fd_count() > (TRACKER_FD_LIMIT + STDIO_FD_COUNT + |
680 | unknown_fds_count + | |
681 | dir_handle_fd_count)) { | |
9ca3e8a2 JG |
682 | fd_cap_respected = false; |
683 | } | |
684 | ||
f7c3ffd7 | 685 | fs_handle_put_fd(handle); |
9ca3e8a2 JG |
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 | ||
f7c3ffd7 JG |
702 | fd = lttng_directory_handle_open_file( |
703 | dir_handle, path, O_RDONLY, 0); | |
9ca3e8a2 JG |
704 | assert(fd >= 0); |
705 | ret = fstat(fd, &fd_stat); | |
706 | 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"); | |
f7c3ffd7 | 740 | ret = cleanup_files(tracker, test_directory, files_to_create, handles, |
9ca3e8a2 JG |
741 | output_files); |
742 | ok(!ret, "Close all opened filesystem handles"); | |
f7c3ffd7 JG |
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); | |
f6bef966 | 747 | end: |
f7c3ffd7 JG |
748 | free(test_directory); |
749 | free(unlinked_files_directory); | |
9ca3e8a2 JG |
750 | } |
751 | ||
f0faf175 JG |
752 | static |
753 | void test_unlink(void) | |
754 | { | |
755 | int ret; | |
756 | struct fd_tracker *tracker; | |
757 | const int handles_to_open = 2; | |
f0faf175 | 758 | struct fs_handle *handles[handles_to_open]; |
ae63e134 | 759 | struct fs_handle *new_handle = NULL; |
f0faf175 | 760 | struct stat statbuf; |
f7c3ffd7 JG |
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 | assert(ret > 0); | |
771 | ret = asprintf(&unlinked_file_one, "%s/%u", unlinked_files_directory, | |
772 | 1); | |
773 | assert(ret > 0); | |
774 | ||
775 | tracker = fd_tracker_create(unlinked_files_directory, 1); | |
f0faf175 | 776 | if (!tracker) { |
f6bef966 | 777 | goto end; |
f0faf175 | 778 | } |
f7c3ffd7 JG |
779 | |
780 | dir_handle = lttng_directory_handle_create(test_directory); | |
781 | assert(dir_handle); | |
f0faf175 JG |
782 | |
783 | /* Open two handles to the same file. */ | |
f7c3ffd7 JG |
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); | |
f0faf175 | 788 | if (ret) { |
f6bef966 | 789 | goto end; |
f0faf175 JG |
790 | } |
791 | ||
792 | /* | |
793 | * Unlinking the first handle should cause the file to be renamed | |
f7c3ffd7 | 794 | * to '0'. |
f0faf175 JG |
795 | */ |
796 | ret = fs_handle_unlink(handles[0]); | |
f7c3ffd7 JG |
797 | ok(!ret, "Successfully unlinked the first handle to %s/%s", |
798 | test_directory, file_name); | |
f0faf175 JG |
799 | |
800 | /* | |
801 | * The original file should no longer exist on the file system, and a | |
f7c3ffd7 | 802 | * new file named '0' should exist. |
f0faf175 | 803 | */ |
f7c3ffd7 JG |
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]); | |
f0faf175 JG |
828 | |
829 | /* The second unlink should fail with -ENOENT. */ | |
830 | ret = fs_handle_unlink(handles[1]); | |
f7c3ffd7 JG |
831 | ok(ret == -ENOENT, |
832 | "ENOENT is reported when attempting to unlink the second handle to %s/%s", | |
833 | test_directory, file_name); | |
f0faf175 JG |
834 | |
835 | /* | |
836 | * Opening a new handle to 'my_file' should succeed. | |
837 | */ | |
f7c3ffd7 JG |
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); | |
f0faf175 JG |
841 | assert(new_handle); |
842 | ||
843 | /* | |
844 | * Unlinking the new handle should cause the file to be renamed | |
f7c3ffd7 | 845 | * to '1' since '0' already exists. |
f0faf175 JG |
846 | */ |
847 | ret = fs_handle_unlink(new_handle); | |
f7c3ffd7 JG |
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); | |
f0faf175 JG |
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 | ||
f7c3ffd7 JG |
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"); | |
f6bef966 | 878 | end: |
f0faf175 | 879 | fd_tracker_destroy(tracker); |
f7c3ffd7 JG |
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); | |
f0faf175 JG |
885 | } |
886 | ||
9ca3e8a2 JG |
887 | int main(int argc, char **argv) |
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 | 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(); | |
ea05fafd | 905 | diag("Unsuspendable - check that file descriptor limit is enforced"); |
9ca3e8a2 JG |
906 | test_unsuspendable_limit(); |
907 | ||
ea05fafd | 908 | diag("Suspendable - check that file descriptor limit is enforced"); |
9ca3e8a2 JG |
909 | test_suspendable_limit(); |
910 | diag("Suspendable - restoration test"); | |
911 | test_suspendable_restore(); | |
912 | ||
ea05fafd | 913 | diag("Mixed - check that file descriptor limit is enforced"); |
9ca3e8a2 JG |
914 | test_mixed_limit(); |
915 | ||
f0faf175 JG |
916 | diag("Suspendable - Unlinking test"); |
917 | test_unlink(); | |
918 | ||
f7c3ffd7 | 919 | rcu_barrier(); |
9ca3e8a2 JG |
920 | rcu_unregister_thread(); |
921 | return exit_status(); | |
922 | } |