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); | |
397 | assert(close(unknown_fds[0]) == 0); | |
398 | assert(close(unknown_fds[1]) == 0); | |
399 | ||
400 | ret = fd_tracker_open_unsuspendable_fd(tracker, &out_fd, | |
401 | NULL, 1, noop_open, &stdout_fd); | |
402 | assert(!ret); | |
403 | ||
404 | ret = fd_tracker_close_unsuspendable_fd(tracker, | |
405 | unknown_fds, 1, noop_close, NULL); | |
406 | ok(ret == -EINVAL, "EINVAL reported on close of an untracked file descriptor"); | |
407 | ||
408 | ret = fd_tracker_close_unsuspendable_fd(tracker, | |
409 | &stdout_fd, 1, noop_close, NULL); | |
410 | assert(!ret); | |
411 | ||
412 | fd_tracker_destroy(tracker); | |
f7c3ffd7 JG |
413 | ret = rmdir(test_directory); |
414 | ok(ret == 0, "Test directory is empty"); | |
f6bef966 | 415 | end: |
f7c3ffd7 JG |
416 | free(test_directory); |
417 | free(unlinked_files_directory); | |
9ca3e8a2 JG |
418 | } |
419 | ||
f7c3ffd7 JG |
420 | static int open_files(struct fd_tracker *tracker, |
421 | struct lttng_directory_handle *directory, | |
422 | unsigned int count, | |
423 | struct fs_handle **handles, | |
424 | char **file_paths) | |
9ca3e8a2 JG |
425 | { |
426 | int ret = 0; | |
427 | unsigned int i; | |
428 | ||
429 | for (i = 0; i < count; i++) { | |
f0faf175 | 430 | int p_ret; |
58cd7196 | 431 | char *file_path; |
9ca3e8a2 JG |
432 | struct fs_handle *handle; |
433 | mode_t mode = S_IWUSR | S_IRUSR; | |
434 | ||
f7c3ffd7 | 435 | p_ret = asprintf(&file_path, "file-%u", i); |
f0faf175 | 436 | assert(p_ret >= 0); |
58cd7196 | 437 | file_paths[i] = file_path; |
9ca3e8a2 | 438 | |
f7c3ffd7 | 439 | handle = fd_tracker_open_fs_handle(tracker, directory, file_path, |
9ca3e8a2 JG |
440 | O_RDWR | O_CREAT, &mode); |
441 | if (!handle) { | |
442 | ret = -1; | |
443 | break; | |
444 | } | |
445 | handles[i] = handle; | |
446 | } | |
447 | return ret; | |
448 | } | |
449 | ||
f7c3ffd7 JG |
450 | static int open_same_file(struct fd_tracker *tracker, |
451 | struct lttng_directory_handle *directory, | |
452 | const char *file, | |
453 | unsigned int count, | |
454 | struct fs_handle **handles) | |
f0faf175 JG |
455 | { |
456 | int ret = 0; | |
457 | unsigned int i; | |
458 | ||
459 | for (i = 0; i < count; i++) { | |
460 | struct fs_handle *handle; | |
461 | mode_t mode = S_IWUSR | S_IRUSR; | |
462 | ||
f7c3ffd7 | 463 | handle = fd_tracker_open_fs_handle(tracker, directory, file, |
f0faf175 JG |
464 | O_RDWR | O_CREAT, &mode); |
465 | if (!handle) { | |
466 | ret = -1; | |
467 | break; | |
468 | } | |
469 | handles[i] = handle; | |
470 | } | |
471 | return ret; | |
472 | } | |
473 | ||
9ca3e8a2 JG |
474 | static |
475 | int cleanup_files(struct fd_tracker *tracker, const char *dir, | |
476 | unsigned int count, struct fs_handle **handles, | |
477 | char **file_paths) | |
478 | { | |
479 | int ret = 0; | |
480 | unsigned int i; | |
481 | ||
482 | for (i = 0; i < count; i++) { | |
483 | char *file_path = file_paths[i]; | |
484 | ||
485 | if (!file_path) { | |
486 | break; | |
487 | } | |
f7c3ffd7 JG |
488 | if (fs_handle_unlink(handles[i])) { |
489 | diag("Failed to unlink fs_handle to file %s", file_path); | |
490 | ret = -1; | |
491 | } | |
58cd7196 | 492 | if (fs_handle_close(handles[i])) { |
f7c3ffd7 | 493 | diag("Failed to close fs_handle to file %s", file_path); |
9ca3e8a2 JG |
494 | ret = -1; |
495 | } | |
f7c3ffd7 | 496 | free(file_path); |
9ca3e8a2 JG |
497 | } |
498 | return ret; | |
499 | } | |
500 | ||
501 | static | |
502 | void test_suspendable_limit(void) | |
503 | { | |
504 | int ret; | |
505 | const int files_to_create = TRACKER_FD_LIMIT * 10; | |
506 | struct fd_tracker *tracker; | |
f7c3ffd7 | 507 | char *test_directory = NULL, *unlinked_files_directory = NULL; |
9ca3e8a2 JG |
508 | char *output_files[files_to_create]; |
509 | struct fs_handle *handles[files_to_create]; | |
f7c3ffd7 JG |
510 | struct lttng_directory_handle *dir_handle = NULL; |
511 | int dir_handle_fd_count; | |
9ca3e8a2 JG |
512 | |
513 | memset(output_files, 0, sizeof(output_files)); | |
514 | memset(handles, 0, sizeof(handles)); | |
515 | ||
f7c3ffd7 JG |
516 | get_temporary_directories(&test_directory, &unlinked_files_directory); |
517 | ||
58cd7196 | 518 | tracker = fd_tracker_create(unlinked_files_directory, TRACKER_FD_LIMIT); |
9ca3e8a2 | 519 | if (!tracker) { |
f6bef966 | 520 | goto end; |
9ca3e8a2 JG |
521 | } |
522 | ||
f7c3ffd7 JG |
523 | dir_handle = lttng_directory_handle_create(test_directory); |
524 | assert(dir_handle); | |
525 | dir_handle_fd_count = !!lttng_directory_handle_uses_fd(dir_handle); | |
9ca3e8a2 | 526 | |
f7c3ffd7 | 527 | ret = open_files(tracker, dir_handle, files_to_create, handles, |
9ca3e8a2 JG |
528 | output_files); |
529 | ok(!ret, "Created %d files with a limit of %d simultaneously-opened file descriptor", | |
530 | files_to_create, TRACKER_FD_LIMIT); | |
f7c3ffd7 JG |
531 | check_fd_count(TRACKER_FD_LIMIT + STDIO_FD_COUNT + unknown_fds_count + |
532 | dir_handle_fd_count); | |
9ca3e8a2 | 533 | |
f7c3ffd7 | 534 | ret = cleanup_files(tracker, test_directory, files_to_create, handles, |
9ca3e8a2 JG |
535 | output_files); |
536 | ok(!ret, "Close all opened filesystem handles"); | |
f7c3ffd7 JG |
537 | ret = rmdir(test_directory); |
538 | ok(ret == 0, "Test directory is empty"); | |
9ca3e8a2 | 539 | fd_tracker_destroy(tracker); |
f7c3ffd7 | 540 | lttng_directory_handle_put(dir_handle); |
f6bef966 | 541 | end: |
f7c3ffd7 JG |
542 | free(test_directory); |
543 | free(unlinked_files_directory); | |
9ca3e8a2 JG |
544 | } |
545 | ||
546 | static | |
547 | void test_mixed_limit(void) | |
548 | { | |
549 | int ret; | |
550 | const int files_to_create = TRACKER_FD_LIMIT; | |
551 | struct fd_tracker *tracker; | |
f7c3ffd7 | 552 | char *test_directory = NULL, *unlinked_files_directory = NULL; |
9ca3e8a2 JG |
553 | char *output_files[files_to_create]; |
554 | struct fs_handle *handles[files_to_create]; | |
f7c3ffd7 JG |
555 | struct lttng_directory_handle *dir_handle = NULL; |
556 | int dir_handle_fd_count; | |
9ca3e8a2 JG |
557 | |
558 | memset(output_files, 0, sizeof(output_files)); | |
559 | memset(handles, 0, sizeof(handles)); | |
560 | ||
f7c3ffd7 JG |
561 | get_temporary_directories(&test_directory, &unlinked_files_directory); |
562 | ||
563 | tracker = fd_tracker_create(unlinked_files_directory, TRACKER_FD_LIMIT); | |
9ca3e8a2 | 564 | if (!tracker) { |
f6bef966 | 565 | goto end; |
9ca3e8a2 JG |
566 | } |
567 | ||
f7c3ffd7 JG |
568 | dir_handle = lttng_directory_handle_create(test_directory); |
569 | assert(dir_handle); | |
570 | dir_handle_fd_count = !!lttng_directory_handle_uses_fd(dir_handle); | |
9ca3e8a2 | 571 | |
f7c3ffd7 | 572 | ret = open_files(tracker, dir_handle, files_to_create, handles, |
9ca3e8a2 JG |
573 | output_files); |
574 | ok(!ret, "Created %d files with a limit of %d simultaneously-opened file descriptor", | |
575 | files_to_create, TRACKER_FD_LIMIT); | |
576 | diag("Check file descriptor count after opening %u files", files_to_create); | |
f7c3ffd7 JG |
577 | check_fd_count(TRACKER_FD_LIMIT + STDIO_FD_COUNT + unknown_fds_count + |
578 | dir_handle_fd_count); | |
9ca3e8a2 JG |
579 | |
580 | /* | |
581 | * Open unsuspendable fds (stdin, stdout, stderr) and verify that the fd | |
582 | * cap is still respected. | |
583 | */ | |
584 | diag("Check file descriptor count after adding %d unsuspendable fds", | |
585 | STDIO_FD_COUNT); | |
586 | track_std_fds(tracker); | |
f7c3ffd7 JG |
587 | check_fd_count(TRACKER_FD_LIMIT + unknown_fds_count + |
588 | dir_handle_fd_count); | |
9ca3e8a2 JG |
589 | diag("Untrack unsuspendable file descriptors"); |
590 | untrack_std_fds(tracker); | |
f7c3ffd7 JG |
591 | check_fd_count(TRACKER_FD_LIMIT + unknown_fds_count + |
592 | dir_handle_fd_count); | |
9ca3e8a2 | 593 | |
f7c3ffd7 | 594 | ret = cleanup_files(tracker, test_directory, files_to_create, handles, |
9ca3e8a2 JG |
595 | output_files); |
596 | ok(!ret, "Close all opened filesystem handles"); | |
f7c3ffd7 JG |
597 | ret = rmdir(test_directory); |
598 | ok(ret == 0, "Test directory is empty"); | |
9ca3e8a2 | 599 | fd_tracker_destroy(tracker); |
f7c3ffd7 | 600 | lttng_directory_handle_put(dir_handle); |
f6bef966 | 601 | end: |
f7c3ffd7 JG |
602 | free(test_directory); |
603 | free(unlinked_files_directory); | |
9ca3e8a2 JG |
604 | } |
605 | ||
606 | /* | |
607 | * Open more files than allowed by the fd tracker's cap and write, | |
608 | * byte-by-byte, and in round-robin, a string. The goal is to force | |
609 | * the fd tracker to suspend and resume the fs_handles often and | |
610 | * verify that the fd cap is always respected. | |
611 | * | |
612 | * The content of the files is also verified at the end. | |
613 | */ | |
614 | static | |
615 | void test_suspendable_restore(void) | |
616 | { | |
617 | int ret; | |
618 | const int files_to_create = TRACKER_FD_LIMIT * 10; | |
619 | struct fd_tracker *tracker; | |
9ca3e8a2 JG |
620 | char *output_files[files_to_create]; |
621 | struct fs_handle *handles[files_to_create]; | |
622 | size_t content_index; | |
623 | int handle_index; | |
624 | bool write_success = true; | |
625 | bool fd_cap_respected = true; | |
626 | bool content_ok = true; | |
f7c3ffd7 JG |
627 | struct lttng_directory_handle *dir_handle = NULL; |
628 | int dir_handle_fd_count; | |
629 | char *test_directory = NULL, *unlinked_files_directory = NULL; | |
9ca3e8a2 JG |
630 | |
631 | memset(output_files, 0, sizeof(output_files)); | |
632 | memset(handles, 0, sizeof(handles)); | |
633 | ||
f7c3ffd7 JG |
634 | get_temporary_directories(&test_directory, &unlinked_files_directory); |
635 | ||
58cd7196 | 636 | tracker = fd_tracker_create(unlinked_files_directory, TRACKER_FD_LIMIT); |
9ca3e8a2 | 637 | if (!tracker) { |
f6bef966 | 638 | goto end; |
9ca3e8a2 JG |
639 | } |
640 | ||
f7c3ffd7 JG |
641 | dir_handle = lttng_directory_handle_create(test_directory); |
642 | assert(dir_handle); | |
643 | dir_handle_fd_count = !!lttng_directory_handle_uses_fd(dir_handle); | |
9ca3e8a2 | 644 | |
f7c3ffd7 | 645 | ret = open_files(tracker, dir_handle, files_to_create, handles, |
9ca3e8a2 JG |
646 | output_files); |
647 | ok(!ret, "Created %d files with a limit of %d simultaneously-opened file descriptor", | |
648 | files_to_create, TRACKER_FD_LIMIT); | |
649 | diag("Check file descriptor count after opening %u files", files_to_create); | |
f7c3ffd7 JG |
650 | check_fd_count(TRACKER_FD_LIMIT + STDIO_FD_COUNT + unknown_fds_count + |
651 | dir_handle_fd_count); | |
9ca3e8a2 JG |
652 | |
653 | for (content_index = 0; content_index < sizeof(file_contents); content_index++) { | |
654 | for (handle_index = 0; handle_index < files_to_create; handle_index++) { | |
655 | int fd; | |
656 | struct fs_handle *handle = handles[handle_index]; | |
657 | const char *path = output_files[handle_index]; | |
658 | ||
659 | fd = fs_handle_get_fd(handle); | |
660 | if (fd < 0) { | |
661 | write_success = false; | |
58cd7196 JG |
662 | diag("Failed to restore fs_handle to %s", |
663 | path); | |
9ca3e8a2 JG |
664 | goto skip_write; |
665 | } | |
666 | ||
667 | do { | |
668 | ret = write(fd, file_contents + content_index, 1); | |
669 | } while (ret < 0 && errno == EINTR); | |
670 | ||
671 | if (ret != 1) { | |
672 | write_success = false; | |
58cd7196 | 673 | PERROR("write() to %s failed", path); |
9ca3e8a2 JG |
674 | goto skip_write; |
675 | } | |
676 | ||
f7c3ffd7 JG |
677 | if (fd_count() > (TRACKER_FD_LIMIT + STDIO_FD_COUNT + |
678 | unknown_fds_count + | |
679 | dir_handle_fd_count)) { | |
9ca3e8a2 JG |
680 | fd_cap_respected = false; |
681 | } | |
682 | ||
f7c3ffd7 | 683 | fs_handle_put_fd(handle); |
9ca3e8a2 JG |
684 | } |
685 | } | |
686 | skip_write: | |
687 | ok(write_success, "Wrote reference string to %d files", | |
688 | files_to_create); | |
689 | ok(fd_cap_respected, "FD tracker enforced the file descriptor cap"); | |
690 | ||
691 | /* Validate the contents of the files. */ | |
692 | for (handle_index = 0; handle_index < files_to_create; handle_index++) { | |
693 | struct stat fd_stat; | |
694 | const char *path = output_files[handle_index]; | |
695 | char read_buf[sizeof(file_contents)]; | |
696 | char *read_pos; | |
697 | size_t to_read = sizeof(read_buf); | |
698 | int fd; | |
699 | ||
f7c3ffd7 JG |
700 | fd = lttng_directory_handle_open_file( |
701 | dir_handle, path, O_RDONLY, 0); | |
9ca3e8a2 JG |
702 | assert(fd >= 0); |
703 | ret = fstat(fd, &fd_stat); | |
704 | assert(!ret); | |
705 | if (fd_stat.st_size != sizeof(file_contents)) { | |
706 | diag("Content size of file %s doesn't match, got %" PRId64 ", expected %zu", | |
707 | path, (int64_t) fd_stat.st_size, | |
708 | sizeof(file_contents)); | |
709 | content_ok = false; | |
710 | (void) close(fd); | |
711 | break; | |
712 | } | |
713 | ||
714 | read_pos = read_buf; | |
715 | do { | |
716 | ret = read(fd, read_pos, to_read); | |
717 | if (ret > 0) { | |
718 | to_read -= ret; | |
719 | read_pos += ret; | |
720 | } | |
721 | } while (to_read && (ret < 0 && errno == EINTR)); | |
722 | if (ret < 0) { | |
723 | content_ok = false; | |
724 | PERROR("Failed to read file %s", path); | |
725 | (void) close(fd); | |
726 | break; | |
727 | } | |
728 | ||
729 | if (strcmp(file_contents, read_buf)) { | |
730 | content_ok = false; | |
731 | diag("File content doesn't match the expectated string"); | |
732 | (void) close(fd); | |
733 | break; | |
734 | } | |
735 | (void) close(fd); | |
736 | } | |
737 | ok(content_ok, "Files contain the expected content"); | |
f7c3ffd7 | 738 | ret = cleanup_files(tracker, test_directory, files_to_create, handles, |
9ca3e8a2 JG |
739 | output_files); |
740 | ok(!ret, "Close all opened filesystem handles"); | |
f7c3ffd7 JG |
741 | ret = rmdir(test_directory); |
742 | ok(ret == 0, "Test directory is empty"); | |
743 | fd_tracker_destroy(tracker); | |
744 | lttng_directory_handle_put(dir_handle); | |
f6bef966 | 745 | end: |
f7c3ffd7 JG |
746 | free(test_directory); |
747 | free(unlinked_files_directory); | |
9ca3e8a2 JG |
748 | } |
749 | ||
f0faf175 JG |
750 | static |
751 | void test_unlink(void) | |
752 | { | |
753 | int ret; | |
754 | struct fd_tracker *tracker; | |
755 | const int handles_to_open = 2; | |
f0faf175 | 756 | struct fs_handle *handles[handles_to_open]; |
ae63e134 | 757 | struct fs_handle *new_handle = NULL; |
f0faf175 | 758 | struct stat statbuf; |
f7c3ffd7 JG |
759 | struct lttng_directory_handle *dir_handle = NULL; |
760 | const char file_name[] = "my_file"; | |
761 | char *test_directory = NULL, *unlinked_files_directory = NULL; | |
762 | char *unlinked_file_zero = NULL, *unlinked_file_one = NULL; | |
763 | int fd; | |
764 | ||
765 | get_temporary_directories(&test_directory, &unlinked_files_directory); | |
766 | ret = asprintf(&unlinked_file_zero, "%s/%u", unlinked_files_directory, | |
767 | 0); | |
768 | assert(ret > 0); | |
769 | ret = asprintf(&unlinked_file_one, "%s/%u", unlinked_files_directory, | |
770 | 1); | |
771 | assert(ret > 0); | |
772 | ||
773 | tracker = fd_tracker_create(unlinked_files_directory, 1); | |
f0faf175 | 774 | if (!tracker) { |
f6bef966 | 775 | goto end; |
f0faf175 | 776 | } |
f7c3ffd7 JG |
777 | |
778 | dir_handle = lttng_directory_handle_create(test_directory); | |
779 | assert(dir_handle); | |
f0faf175 JG |
780 | |
781 | /* Open two handles to the same file. */ | |
f7c3ffd7 JG |
782 | ret = open_same_file(tracker, dir_handle, file_name, handles_to_open, |
783 | handles); | |
784 | ok(!ret, "Successfully opened %i handles to %s/%s", handles_to_open, | |
785 | test_directory, file_name); | |
f0faf175 | 786 | if (ret) { |
f6bef966 | 787 | goto end; |
f0faf175 JG |
788 | } |
789 | ||
790 | /* | |
791 | * Unlinking the first handle should cause the file to be renamed | |
f7c3ffd7 | 792 | * to '0'. |
f0faf175 JG |
793 | */ |
794 | ret = fs_handle_unlink(handles[0]); | |
f7c3ffd7 JG |
795 | ok(!ret, "Successfully unlinked the first handle to %s/%s", |
796 | test_directory, file_name); | |
f0faf175 JG |
797 | |
798 | /* | |
799 | * The original file should no longer exist on the file system, and a | |
f7c3ffd7 | 800 | * new file named '0' should exist. |
f0faf175 | 801 | */ |
f7c3ffd7 JG |
802 | ok(lttng_directory_handle_stat(dir_handle, file_name, &statbuf) == -1 && |
803 | errno == ENOENT, | |
804 | "%s no longer present on file system after unlink", | |
805 | file_name); | |
806 | ok(lttng_directory_handle_stat( | |
807 | dir_handle, unlinked_file_zero, &statbuf) == 0, | |
808 | "%s exists on file system after unlink", | |
809 | unlinked_file_zero); | |
810 | ||
811 | /* | |
812 | * It should be possible to use the file descriptors of both handles. | |
813 | * Since only one file descriptor can be opened at once, this should | |
814 | * force the fd_tracker to suspend and restore the handles. | |
815 | */ | |
816 | fd = fs_handle_get_fd(handles[0]); | |
817 | ok(fd >= 0, "Got fd from first handle"); | |
818 | ||
819 | fd = fs_handle_get_fd(handles[1]); | |
820 | ok (fd < 0, "fd tracker does not allow two fds to be used at once"); | |
821 | ||
822 | fs_handle_put_fd(handles[0]); | |
823 | fd = fs_handle_get_fd(handles[1]); | |
824 | ok(fd >= 0, "Got fd from second handle"); | |
825 | fs_handle_put_fd(handles[1]); | |
f0faf175 JG |
826 | |
827 | /* The second unlink should fail with -ENOENT. */ | |
828 | ret = fs_handle_unlink(handles[1]); | |
f7c3ffd7 JG |
829 | ok(ret == -ENOENT, |
830 | "ENOENT is reported when attempting to unlink the second handle to %s/%s", | |
831 | test_directory, file_name); | |
f0faf175 JG |
832 | |
833 | /* | |
834 | * Opening a new handle to 'my_file' should succeed. | |
835 | */ | |
f7c3ffd7 JG |
836 | ret = open_same_file(tracker, dir_handle, file_name, 1, &new_handle); |
837 | ok(!ret, "Successfully opened a new handle to previously unlinked file %s/%s", | |
838 | test_directory, file_name); | |
f0faf175 JG |
839 | assert(new_handle); |
840 | ||
841 | /* | |
842 | * Unlinking the new handle should cause the file to be renamed | |
f7c3ffd7 | 843 | * to '1' since '0' already exists. |
f0faf175 JG |
844 | */ |
845 | ret = fs_handle_unlink(new_handle); | |
f7c3ffd7 JG |
846 | ok(!ret, "Successfully unlinked the new handle handle to %s/%s", |
847 | test_directory, file_name); | |
848 | ok(stat(unlinked_file_one, &statbuf) == 0, | |
849 | "%s exists on file system after unlink", | |
850 | unlinked_file_one); | |
f0faf175 JG |
851 | |
852 | ret = fs_handle_close(handles[0]); | |
853 | ok(!ret, "Successfully closed the first handle"); | |
854 | ret = fs_handle_close(handles[1]); | |
855 | ok(!ret, "Successfully closed the second handle"); | |
856 | ret = fs_handle_close(new_handle); | |
857 | ok(!ret, "Successfully closed the third handle"); | |
858 | ||
f7c3ffd7 JG |
859 | ok(lttng_directory_handle_stat(dir_handle, file_name, &statbuf) == -1 && |
860 | errno == ENOENT, | |
861 | "%s no longer present on file system after handle close", | |
862 | file_name); | |
863 | ok(lttng_directory_handle_stat( | |
864 | dir_handle, unlinked_file_zero, &statbuf) == -1 && | |
865 | errno == ENOENT, | |
866 | "%s no longer present on file system after handle close", | |
867 | unlinked_file_zero); | |
868 | ok(lttng_directory_handle_stat(dir_handle, unlinked_file_one, | |
869 | &statbuf) == -1 && | |
870 | errno == ENOENT, | |
871 | "%s no longer present on file system after handle close", | |
872 | unlinked_file_one); | |
873 | ||
874 | ret = rmdir(test_directory); | |
875 | ok(ret == 0, "Test directory is empty"); | |
f6bef966 | 876 | end: |
f0faf175 | 877 | fd_tracker_destroy(tracker); |
f7c3ffd7 JG |
878 | free(test_directory); |
879 | free(unlinked_files_directory); | |
880 | free(unlinked_file_zero); | |
881 | free(unlinked_file_one); | |
882 | lttng_directory_handle_put(dir_handle); | |
f0faf175 JG |
883 | } |
884 | ||
9ca3e8a2 JG |
885 | int main(int argc, char **argv) |
886 | { | |
887 | plan_tests(NUM_TESTS); | |
888 | diag("File descriptor tracker unit tests"); | |
889 | ||
890 | rcu_register_thread(); | |
891 | ||
892 | unknown_fds_count = fd_count() - STDIO_FD_COUNT; | |
893 | assert(unknown_fds_count >= 0); | |
894 | ||
895 | diag("Unsuspendable - basic"); | |
896 | test_unsuspendable_basic(); | |
897 | diag("Unsuspendable - callback return values"); | |
898 | test_unsuspendable_cb_return(); | |
899 | diag("Unsuspendable - duplicate file descriptors"); | |
900 | test_unsuspendable_duplicate(); | |
901 | diag("Unsuspendable - closing an untracked file descriptor"); | |
902 | test_unsuspendable_close_untracked(); | |
ea05fafd | 903 | diag("Unsuspendable - check that file descriptor limit is enforced"); |
9ca3e8a2 JG |
904 | test_unsuspendable_limit(); |
905 | ||
ea05fafd | 906 | diag("Suspendable - check that file descriptor limit is enforced"); |
9ca3e8a2 JG |
907 | test_suspendable_limit(); |
908 | diag("Suspendable - restoration test"); | |
909 | test_suspendable_restore(); | |
910 | ||
ea05fafd | 911 | diag("Mixed - check that file descriptor limit is enforced"); |
9ca3e8a2 JG |
912 | test_mixed_limit(); |
913 | ||
f0faf175 JG |
914 | diag("Suspendable - Unlinking test"); |
915 | test_unlink(); | |
916 | ||
f7c3ffd7 | 917 | rcu_barrier(); |
9ca3e8a2 JG |
918 | rcu_unregister_thread(); |
919 | return exit_status(); | |
920 | } |