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f0966704 MD |
1 | /* |
2 | * ust-multi-test.c - single-proces, multi-session, multi-channel, multi-event UST tracing | |
3 | * | |
4 | * Copyright (C) 2011 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com> | |
5 | * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca> | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify it | |
8 | * under the terms of the GNU General Public License as published by the Free | |
9 | * Software Foundation; only version 2 of the License. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, but WITHOUT | |
12 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
13 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
14 | * more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License along with | |
17 | * this program; if not, write to the Free Software Foundation, Inc., 59 Temple | |
18 | * Place - Suite 330, Boston, MA 02111-1307, USA. | |
19 | */ | |
20 | ||
21 | #define _LARGEFILE64_SOURCE | |
9d335227 | 22 | #define _GNU_SOURCE |
f0966704 MD |
23 | #include <errno.h> |
24 | #include <stdio.h> | |
25 | #include <stdlib.h> | |
26 | #include <string.h> | |
27 | #include <signal.h> | |
28 | #include <unistd.h> | |
29 | #include <sys/wait.h> | |
30 | #include <sys/types.h> | |
31 | #include <sys/stat.h> | |
32 | #include <fcntl.h> | |
33 | #include <sys/mman.h> | |
34 | #include <limits.h> | |
35 | #include <urcu/futex.h> | |
36 | #include <urcu/uatomic.h> | |
37 | #include <assert.h> | |
38 | #include <sys/socket.h> | |
39 | ||
a3bb4b27 | 40 | #include <ust-comm.h> |
f0966704 MD |
41 | #include <../../libringbuffer/backend.h> |
42 | #include <../../libringbuffer/frontend.h> | |
e5757a90 | 43 | #include "../../liblttng-ust/compat.h" /* For ENODATA */ |
f0966704 MD |
44 | |
45 | #define NR_SESSIONS 4 | |
46 | #define NR_CHANNELS 1 | |
47 | #define MAX_NR_STREAMS 64 | |
48 | #define NR_EVENTS 3 | |
49 | ||
50 | const char *evname[] = { | |
51 | "ust_tests_hello_tptest", | |
52 | "ust_tests_hello_tptest_sighandler", | |
53 | "ust_tests_hello_dontexist", | |
54 | }; | |
55 | ||
f0966704 | 56 | static int session_handle[NR_SESSIONS]; |
61f02aea MD |
57 | static struct lttng_ust_object_data metadata_stream_data[NR_SESSIONS]; |
58 | static struct lttng_ust_object_data metadata_data[NR_SESSIONS]; | |
59 | static struct lttng_ust_object_data channel_data[NR_SESSIONS][NR_CHANNELS]; | |
60 | static struct lttng_ust_object_data stream_data[NR_SESSIONS][NR_CHANNELS][MAX_NR_STREAMS]; | |
f0966704 MD |
61 | static int event_handle[NR_SESSIONS][NR_CHANNELS][NR_EVENTS]; |
62 | ||
63 | static int apps_socket = -1; | |
64 | static char apps_sock_path[PATH_MAX]; | |
65 | static char local_apps_wait_shm_path[PATH_MAX]; | |
66 | ||
67 | static volatile int quit_program; | |
68 | ||
69 | static void handle_signals(int signo) | |
70 | { | |
71 | quit_program = 1; | |
72 | } | |
73 | ||
f0966704 | 74 | static |
61f02aea | 75 | int open_streams(int sock, int channel_handle, struct lttng_ust_object_data *stream_datas, |
f0966704 MD |
76 | int nr_check) |
77 | { | |
78 | int ret, k = 0; | |
79 | ||
80 | for (;;) { | |
57773204 MD |
81 | struct ustcomm_ust_msg lum; |
82 | struct ustcomm_ust_reply lur; | |
f0966704 MD |
83 | |
84 | memset(&lum, 0, sizeof(lum)); | |
85 | lum.handle = channel_handle; | |
86 | lum.cmd = LTTNG_UST_STREAM; | |
57773204 | 87 | ret = ustcomm_send_app_cmd(sock, &lum, &lur); |
f0966704 MD |
88 | if (!ret) { |
89 | assert(k < nr_check); | |
90 | stream_datas[k].handle = lur.ret_val; | |
91 | printf("received stream handle %u\n", | |
92 | stream_datas[k].handle); | |
57773204 | 93 | if (lur.ret_code == USTCOMM_OK) { |
f0966704 MD |
94 | ssize_t len; |
95 | ||
96 | stream_datas[k].memory_map_size = lur.u.stream.memory_map_size; | |
97 | /* get shm fd */ | |
57773204 | 98 | len = ustcomm_recv_fd(sock); |
f0966704 MD |
99 | if (len < 0) |
100 | return -EINVAL; | |
101 | stream_datas[k].shm_fd = len; | |
102 | /* get wait fd */ | |
57773204 | 103 | len = ustcomm_recv_fd(sock); |
f0966704 MD |
104 | if (len < 0) |
105 | return -EINVAL; | |
106 | stream_datas[k].wait_fd = len; | |
107 | } | |
108 | k++; | |
109 | } | |
110 | if (ret == -ENOENT) | |
111 | break; | |
112 | if (ret) | |
113 | return ret; | |
114 | } | |
115 | return 0; | |
116 | } | |
117 | ||
118 | static | |
61f02aea | 119 | int close_streams(int sock, struct lttng_ust_object_data *stream_datas, int nr_check) |
f0966704 MD |
120 | { |
121 | int ret, k; | |
122 | ||
123 | for (k = 0; k < nr_check; k++) { | |
57773204 MD |
124 | struct ustcomm_ust_msg lum; |
125 | struct ustcomm_ust_reply lur; | |
f0966704 MD |
126 | |
127 | if (!stream_datas[k].handle) | |
128 | continue; | |
129 | memset(&lum, 0, sizeof(lum)); | |
130 | lum.handle = stream_datas[k].handle; | |
131 | lum.cmd = LTTNG_UST_RELEASE; | |
57773204 | 132 | ret = ustcomm_send_app_cmd(sock, &lum, &lur); |
f0966704 MD |
133 | if (ret) { |
134 | printf("Error closing stream\n"); | |
135 | return ret; | |
136 | } | |
137 | if (stream_datas[k].shm_fd >= 0) { | |
138 | ret = close(stream_datas[k].shm_fd); | |
139 | if (ret) { | |
140 | printf("Error closing stream shm_fd\n"); | |
141 | return ret; | |
142 | } | |
143 | } | |
144 | if (stream_datas[k].wait_fd >= 0) { | |
145 | ret = close(stream_datas[k].wait_fd); | |
146 | if (ret) { | |
147 | printf("Error closing stream wait_fd\n"); | |
148 | return ret; | |
149 | } | |
150 | } | |
151 | } | |
152 | return 0; | |
153 | } | |
154 | ||
155 | static | |
38fae1d3 | 156 | struct lttng_ust_shm_handle *map_channel(struct lttng_ust_object_data *chan_data, |
61f02aea | 157 | struct lttng_ust_object_data *stream_datas, int nr_check) |
f0966704 | 158 | { |
38fae1d3 | 159 | struct lttng_ust_shm_handle *handle; |
f0966704 MD |
160 | struct channel *chan; |
161 | int k, ret; | |
162 | ||
163 | /* map metadata channel */ | |
164 | handle = channel_handle_create(chan_data->shm_fd, | |
165 | chan_data->wait_fd, | |
166 | chan_data->memory_map_size); | |
167 | if (!handle) { | |
168 | printf("create handle error\n"); | |
169 | return NULL; | |
170 | } | |
171 | chan_data->shm_fd = -1; | |
172 | chan_data->wait_fd = -1; | |
173 | chan = shmp(handle, handle->chan); | |
174 | ||
175 | for (k = 0; k < nr_check; k++) { | |
61f02aea | 176 | struct lttng_ust_object_data *stream_data = &stream_datas[k]; |
f0966704 MD |
177 | |
178 | if (!stream_data->handle) | |
179 | break; | |
180 | /* map stream */ | |
181 | ret = channel_handle_add_stream(handle, | |
182 | stream_data->shm_fd, | |
183 | stream_data->wait_fd, | |
184 | stream_data->memory_map_size); | |
185 | if (ret) { | |
186 | printf("add stream error\n"); | |
187 | goto error_destroy; | |
188 | } | |
189 | stream_data->shm_fd = -1; | |
190 | stream_data->wait_fd = -1; | |
191 | } | |
192 | return handle; | |
193 | ||
194 | error_destroy: | |
195 | channel_destroy(chan, handle, 1); | |
196 | return NULL; | |
197 | } | |
198 | ||
199 | static | |
38fae1d3 | 200 | void unmap_channel(struct lttng_ust_shm_handle *handle) |
f0966704 MD |
201 | { |
202 | struct channel *chan; | |
203 | ||
204 | chan = shmp(handle, handle->chan); | |
205 | /* unmap channel */ | |
206 | channel_destroy(chan, handle, 1); | |
207 | } | |
208 | ||
209 | static | |
38fae1d3 | 210 | int consume_stream(struct lttng_ust_shm_handle *handle, int cpu, char *outfile) |
f0966704 MD |
211 | { |
212 | struct channel *chan; | |
4cfec15c | 213 | struct lttng_ust_lib_ring_buffer *buf; |
f0966704 | 214 | int outfd, ret; |
ef9ff354 MD |
215 | int *shm_fd, *wait_fd; |
216 | uint64_t *memory_map_size; | |
f0966704 MD |
217 | |
218 | chan = shmp(handle, handle->chan); | |
219 | ||
220 | /* open stream */ | |
221 | buf = channel_get_ring_buffer(&chan->backend.config, | |
222 | chan, cpu, handle, &shm_fd, &wait_fd, &memory_map_size); | |
223 | if (!buf) | |
224 | return -ENOENT; | |
225 | ret = lib_ring_buffer_open_read(buf, handle, 1); | |
226 | if (ret) { | |
227 | return -1; | |
228 | } | |
229 | ||
230 | /* copy */ | |
231 | outfd = open(outfile, O_WRONLY | O_CREAT | O_LARGEFILE | O_TRUNC, | |
232 | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); | |
233 | if (outfd < 0) { | |
234 | perror("open output"); | |
235 | return -1; | |
236 | } | |
237 | ||
238 | printf("Waiting for buffer data for %s\n", outfile); | |
239 | for (;;) { | |
240 | unsigned long read_size; | |
241 | unsigned long copy_size; | |
242 | char *ptr; | |
243 | ||
244 | ret = lib_ring_buffer_get_next_subbuf(buf, handle); | |
245 | printf("get next ret %d\n", ret); | |
246 | if (ret == -ENODATA) | |
247 | break; | |
248 | if (ret == -EAGAIN) { | |
249 | sleep(1); | |
250 | continue; | |
251 | } | |
252 | if (ret) { | |
253 | printf("Error %d in lib_ring_buffer_get_next_subbuf\n", ret); | |
254 | return -1; | |
255 | } | |
256 | read_size = lib_ring_buffer_get_read_data_size( | |
257 | &chan->backend.config, buf, handle); | |
258 | read_size = PAGE_ALIGN(read_size); | |
259 | ptr = lib_ring_buffer_read_offset_address( | |
260 | &buf->backend, 0, handle); | |
261 | printf("WRITE: copy %lu bytes\n", read_size); | |
262 | copy_size = write(outfd, ptr, read_size); | |
263 | if (copy_size < read_size) { | |
361dedfb | 264 | printf("write issue: copied %lu, expected %lu\n", copy_size, read_size); |
f0966704 MD |
265 | } |
266 | lib_ring_buffer_put_next_subbuf(buf, handle); | |
267 | } | |
268 | ||
269 | ret = close(outfd); | |
270 | if (ret) { | |
271 | perror("close"); | |
272 | return -1; | |
273 | } | |
274 | ||
275 | /* close stream */ | |
276 | lib_ring_buffer_release_read(buf, handle, 1); | |
277 | return 0; | |
278 | } | |
279 | ||
280 | static | |
281 | int consume_buffers(void) | |
282 | { | |
283 | int i, j, k, ret; | |
284 | mode_t old_umask; | |
285 | ||
286 | for (i = 0; i < NR_SESSIONS; i++) { | |
287 | char pathname[PATH_MAX]; | |
38fae1d3 | 288 | struct lttng_ust_shm_handle *handle; |
f0966704 MD |
289 | |
290 | snprintf(pathname, PATH_MAX - 1, "/tmp/testtrace%u", i); | |
291 | old_umask = umask(0); | |
292 | ret = mkdir(pathname, S_IRWXU | S_IRWXG); | |
293 | if (ret && errno != EEXIST) { | |
294 | perror("mkdir"); | |
295 | umask(old_umask); | |
296 | return -1; | |
297 | } | |
298 | umask(old_umask); | |
299 | ||
300 | /* copy metadata */ | |
301 | handle = map_channel(&metadata_data[i], | |
302 | &metadata_stream_data[i], 1); | |
303 | if (!handle) | |
304 | return -1; | |
305 | snprintf(pathname, PATH_MAX - 1, | |
306 | "/tmp/testtrace%u/metadata", i); | |
307 | ret = consume_stream(handle, -1, pathname); | |
308 | if (ret && ret != -ENOENT) { | |
309 | printf("Error in consume_stream\n"); | |
310 | return ret; | |
311 | } | |
312 | unmap_channel(handle); | |
313 | ||
314 | /* copy binary data */ | |
315 | for (j = 0; j < NR_CHANNELS; j++) { | |
316 | handle = map_channel(&channel_data[i][j], | |
317 | stream_data[i][j], MAX_NR_STREAMS); | |
318 | if (!handle) | |
319 | return -1; | |
320 | for (k = 0; k < MAX_NR_STREAMS; k++) { | |
321 | snprintf(pathname, PATH_MAX - 1, | |
322 | "/tmp/testtrace%u/data_%u", i, k); | |
323 | ret = consume_stream(handle, k, pathname); | |
324 | if (ret && ret != -ENOENT) { | |
325 | printf("Error in consume_stream\n"); | |
326 | return ret; | |
327 | } | |
328 | } | |
329 | unmap_channel(handle); | |
330 | } | |
331 | } | |
332 | ||
333 | return 0; | |
334 | } | |
335 | ||
336 | int send_app_msgs(int sock) | |
337 | { | |
57773204 MD |
338 | struct ustcomm_ust_msg lum; |
339 | struct ustcomm_ust_reply lur; | |
f0966704 MD |
340 | int ret, i, j, k; |
341 | ||
342 | for (i = 0; i < NR_SESSIONS; i++) { | |
343 | /* Create session */ | |
344 | memset(&lum, 0, sizeof(lum)); | |
345 | lum.handle = LTTNG_UST_ROOT_HANDLE; | |
346 | lum.cmd = LTTNG_UST_SESSION; | |
57773204 | 347 | ret = ustcomm_send_app_cmd(sock, &lum, &lur); |
f0966704 MD |
348 | if (ret) |
349 | return ret; | |
350 | session_handle[i] = lur.ret_val; | |
351 | printf("received session handle %u\n", session_handle[i]); | |
352 | ||
353 | /* Create metadata channel */ | |
354 | memset(&lum, 0, sizeof(lum)); | |
355 | lum.handle = session_handle[i]; | |
356 | lum.cmd = LTTNG_UST_METADATA; | |
357 | lum.u.channel.overwrite = 0; | |
358 | lum.u.channel.subbuf_size = 32768; | |
359 | lum.u.channel.num_subbuf = 4; | |
360 | lum.u.channel.switch_timer_interval = 0; | |
361 | lum.u.channel.read_timer_interval = 0; | |
362 | lum.u.channel.output = LTTNG_UST_MMAP; | |
57773204 | 363 | ret = ustcomm_send_app_cmd(sock, &lum, &lur); |
f0966704 MD |
364 | if (ret) |
365 | return ret; | |
366 | metadata_data[i].handle = lur.ret_val; | |
367 | printf("received metadata handle %u\n", metadata_data[i].handle); | |
57773204 | 368 | if (lur.ret_code == USTCOMM_OK) { |
f0966704 MD |
369 | ssize_t len; |
370 | ||
371 | metadata_data[i].memory_map_size = lur.u.channel.memory_map_size; | |
372 | /* get shm fd */ | |
57773204 | 373 | len = ustcomm_recv_fd(sock); |
f0966704 MD |
374 | if (len < 0) |
375 | return -EINVAL; | |
376 | metadata_data[i].shm_fd = len; | |
377 | /* get wait fd */ | |
57773204 | 378 | len = ustcomm_recv_fd(sock); |
f0966704 MD |
379 | if (len < 0) |
380 | return -EINVAL; | |
381 | metadata_data[i].wait_fd = len; | |
382 | } | |
383 | ||
384 | ret = open_streams(sock, metadata_data[i].handle, | |
385 | &metadata_stream_data[i], 1); | |
386 | if (ret) { | |
387 | printf("Error in open_streams\n"); | |
388 | return ret; | |
389 | } | |
390 | ||
391 | /* Create channels */ | |
392 | for (j = 0; j < NR_CHANNELS; j++) { | |
393 | memset(&lum, 0, sizeof(lum)); | |
394 | lum.handle = session_handle[i]; | |
395 | lum.cmd = LTTNG_UST_CHANNEL; | |
396 | //lum.u.channel.overwrite = 0; | |
397 | lum.u.channel.overwrite = 1; | |
398 | lum.u.channel.subbuf_size = 32768; | |
399 | lum.u.channel.num_subbuf = 8; | |
400 | //lum.u.channel.num_subbuf = 4; | |
401 | //lum.u.channel.num_subbuf = 2; | |
402 | lum.u.channel.switch_timer_interval = 0; | |
403 | lum.u.channel.read_timer_interval = 0; | |
404 | lum.u.channel.output = LTTNG_UST_MMAP; | |
57773204 | 405 | ret = ustcomm_send_app_cmd(sock, &lum, &lur); |
f0966704 MD |
406 | if (ret) |
407 | return ret; | |
408 | channel_data[i][j].handle = lur.ret_val; | |
409 | printf("received channel handle %u\n", channel_data[i][j].handle); | |
57773204 | 410 | if (lur.ret_code == USTCOMM_OK) { |
f0966704 MD |
411 | ssize_t len; |
412 | ||
413 | channel_data[i][j].memory_map_size = lur.u.channel.memory_map_size; | |
414 | /* get shm fd */ | |
57773204 | 415 | len = ustcomm_recv_fd(sock); |
f0966704 MD |
416 | if (len < 0) |
417 | return -EINVAL; | |
418 | channel_data[i][j].shm_fd = len; | |
419 | /* get wait fd */ | |
57773204 | 420 | len = ustcomm_recv_fd(sock); |
f0966704 MD |
421 | if (len < 0) |
422 | return -EINVAL; | |
423 | channel_data[i][j].wait_fd = len; | |
424 | } | |
425 | ||
426 | /* Create events */ | |
427 | for (k = 0; k < NR_EVENTS; k++) { | |
428 | memset(&lum, 0, sizeof(lum)); | |
429 | lum.handle = channel_data[i][j].handle; | |
430 | lum.cmd = LTTNG_UST_EVENT; | |
431 | strncpy(lum.u.event.name, evname[k], | |
432 | LTTNG_UST_SYM_NAME_LEN); | |
433 | lum.u.event.instrumentation = LTTNG_UST_TRACEPOINT; | |
57773204 | 434 | ret = ustcomm_send_app_cmd(sock, &lum, &lur); |
f0966704 MD |
435 | if (ret) |
436 | return ret; | |
437 | event_handle[i][j][k] = lur.ret_val; | |
438 | printf("received event handle %u\n", event_handle[i][j][k]); | |
439 | } | |
440 | ||
441 | /* Get references to channel streams */ | |
442 | ret = open_streams(sock, channel_data[i][j].handle, | |
443 | stream_data[i][j], MAX_NR_STREAMS); | |
444 | if (ret) { | |
445 | printf("Error in open_streams\n"); | |
446 | return ret; | |
447 | } | |
448 | } | |
449 | ||
450 | memset(&lum, 0, sizeof(lum)); | |
451 | lum.handle = session_handle[i]; | |
452 | lum.cmd = LTTNG_UST_SESSION_START; | |
57773204 | 453 | ret = ustcomm_send_app_cmd(sock, &lum, &lur); |
f0966704 MD |
454 | if (ret) |
455 | return ret; | |
456 | printf("Session handle %u started.\n", session_handle[i]); | |
457 | } | |
458 | ||
459 | /* Tell application registration is done */ | |
460 | memset(&lum, 0, sizeof(lum)); | |
461 | lum.handle = LTTNG_UST_ROOT_HANDLE; | |
462 | lum.cmd = LTTNG_UST_REGISTER_DONE; | |
57773204 | 463 | ret = ustcomm_send_app_cmd(sock, &lum, &lur); |
f0966704 MD |
464 | if (ret) |
465 | return ret; | |
466 | printf("Registration done acknowledged.\n"); | |
467 | ||
468 | sleep(4); | |
469 | ||
470 | ret = consume_buffers(); | |
471 | if (ret) { | |
472 | printf("Error in consume_buffers\n"); | |
473 | return ret; | |
474 | } | |
475 | ||
476 | for (i = 0; i < NR_SESSIONS; i++) { | |
477 | /* Release channels */ | |
478 | for (j = 0; j < NR_CHANNELS; j++) { | |
479 | /* Release streams */ | |
480 | ret = close_streams(sock, stream_data[i][j], | |
481 | MAX_NR_STREAMS); | |
482 | if (ret) | |
483 | return ret; | |
484 | ||
485 | /* Release events */ | |
486 | for (k = 0; k < NR_EVENTS; k++) { | |
487 | memset(&lum, 0, sizeof(lum)); | |
488 | lum.handle = event_handle[i][j][k]; | |
489 | lum.cmd = LTTNG_UST_RELEASE; | |
57773204 | 490 | ret = ustcomm_send_app_cmd(sock, &lum, &lur); |
f0966704 MD |
491 | if (ret) |
492 | return ret; | |
493 | } | |
494 | memset(&lum, 0, sizeof(lum)); | |
495 | lum.handle = channel_data[i][j].handle; | |
496 | lum.cmd = LTTNG_UST_RELEASE; | |
57773204 | 497 | ret = ustcomm_send_app_cmd(sock, &lum, &lur); |
f0966704 MD |
498 | if (ret) |
499 | return ret; | |
500 | if (channel_data[i][j].shm_fd >= 0) { | |
501 | ret = close(channel_data[i][j].shm_fd); | |
502 | if (ret) | |
503 | return ret; | |
504 | } | |
505 | if (channel_data[i][j].wait_fd >= 0) { | |
506 | ret = close(channel_data[i][j].wait_fd); | |
507 | if (ret) | |
508 | return ret; | |
509 | } | |
510 | } | |
511 | ||
512 | /* Release metadata channel */ | |
513 | ret = close_streams(sock, &metadata_stream_data[i], 1); | |
514 | if (ret) | |
515 | return ret; | |
516 | ||
517 | memset(&lum, 0, sizeof(lum)); | |
518 | lum.handle = metadata_data[i].handle; | |
519 | lum.cmd = LTTNG_UST_RELEASE; | |
57773204 | 520 | ret = ustcomm_send_app_cmd(sock, &lum, &lur); |
f0966704 MD |
521 | if (ret) |
522 | return ret; | |
523 | if (metadata_data[i].shm_fd >= 0) { | |
524 | ret = close(metadata_data[i].shm_fd); | |
525 | if (ret) | |
526 | return ret; | |
527 | } | |
528 | if (metadata_data[i].wait_fd >= 0) { | |
529 | ret = close(metadata_data[i].wait_fd); | |
530 | if (ret) | |
531 | return ret; | |
532 | } | |
533 | ||
534 | /* Release session */ | |
535 | memset(&lum, 0, sizeof(lum)); | |
536 | lum.handle = session_handle[i]; | |
537 | lum.cmd = LTTNG_UST_RELEASE; | |
57773204 | 538 | ret = ustcomm_send_app_cmd(sock, &lum, &lur); |
f0966704 MD |
539 | if (ret) |
540 | return ret; | |
541 | } | |
542 | ||
543 | return 0; | |
544 | } | |
545 | ||
546 | /* | |
547 | * Using fork to set umask in the child process (not multi-thread safe). We | |
548 | * deal with the shm_open vs ftruncate race (happening when the sessiond owns | |
549 | * the shm and does not let everybody modify it, to ensure safety against | |
550 | * shm_unlink) by simply letting the mmap fail and retrying after a few | |
551 | * seconds. For global shm, everybody has rw access to it until the sessiond | |
552 | * starts. | |
553 | */ | |
554 | static int get_wait_shm(char *shm_path, size_t mmap_size, int global) | |
555 | { | |
556 | int wait_shm_fd, ret; | |
557 | mode_t mode; | |
558 | ||
559 | /* Default permissions */ | |
560 | mode = S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP; | |
561 | ||
562 | /* Change owner of the shm path */ | |
563 | if (global) { | |
564 | ret = chown(shm_path, 0, 0); | |
565 | if (ret < 0) { | |
566 | if (errno != ENOENT) { | |
567 | perror("chown wait shm"); | |
568 | goto error; | |
569 | } | |
570 | } | |
571 | ||
572 | /* | |
573 | * If global session daemon, any application can register so the shm | |
574 | * needs to be set in read-only mode for others. | |
575 | */ | |
576 | mode |= S_IROTH; | |
577 | } else { | |
578 | ret = chown(shm_path, getuid(), getgid()); | |
579 | if (ret < 0) { | |
580 | if (errno != ENOENT) { | |
581 | perror("chown wait shm"); | |
582 | goto error; | |
583 | } | |
584 | } | |
585 | } | |
586 | ||
587 | /* | |
588 | * Set permissions to the shm even if we did not create the shm. | |
589 | */ | |
590 | ret = chmod(shm_path, mode); | |
591 | if (ret < 0) { | |
592 | if (errno != ENOENT) { | |
593 | perror("chmod wait shm"); | |
594 | goto error; | |
595 | } | |
596 | } | |
597 | ||
598 | /* | |
599 | * We're alone in a child process, so we can modify the process-wide | |
600 | * umask. | |
601 | */ | |
602 | umask(~mode); | |
603 | ||
604 | /* | |
605 | * Try creating shm (or get rw access). We don't do an exclusive open, | |
606 | * because we allow other processes to create+ftruncate it concurrently. | |
607 | */ | |
608 | wait_shm_fd = shm_open(shm_path, O_RDWR | O_CREAT, mode); | |
609 | if (wait_shm_fd < 0) { | |
610 | perror("shm_open wait shm"); | |
611 | goto error; | |
612 | } | |
613 | ||
614 | ret = ftruncate(wait_shm_fd, mmap_size); | |
615 | if (ret < 0) { | |
616 | perror("ftruncate wait shm"); | |
617 | exit(EXIT_FAILURE); | |
618 | } | |
619 | ||
620 | ret = fchmod(wait_shm_fd, mode); | |
621 | if (ret < 0) { | |
622 | perror("fchmod"); | |
623 | exit(EXIT_FAILURE); | |
624 | } | |
625 | ||
626 | printf("Got the wait shm fd %d\n", wait_shm_fd); | |
627 | ||
628 | return wait_shm_fd; | |
629 | ||
630 | error: | |
631 | printf("Failing to get the wait shm fd\n"); | |
632 | ||
633 | return -1; | |
634 | } | |
635 | ||
636 | int update_futex(int fd, int active) | |
637 | { | |
638 | size_t mmap_size = sysconf(_SC_PAGE_SIZE); | |
639 | char *wait_shm_mmap; | |
640 | int ret; | |
641 | ||
642 | wait_shm_mmap = mmap(NULL, mmap_size, PROT_READ | PROT_WRITE, | |
643 | MAP_SHARED, fd, 0); | |
644 | if (wait_shm_mmap == MAP_FAILED) { | |
645 | perror("mmap"); | |
646 | goto error; | |
647 | } | |
648 | ||
649 | if (active) { | |
650 | uatomic_set((int32_t *) wait_shm_mmap, 1); | |
651 | futex_async((int32_t *) wait_shm_mmap, FUTEX_WAKE, | |
652 | INT_MAX, NULL, NULL, 0); | |
653 | } else { | |
654 | uatomic_set((int32_t *) wait_shm_mmap, 0); | |
655 | } | |
656 | ret = munmap(wait_shm_mmap, mmap_size); | |
657 | if (ret) { | |
658 | perror("Error unmapping wait shm"); | |
659 | goto error; | |
660 | } | |
661 | return 0; | |
662 | error: | |
663 | return -1; | |
664 | } | |
665 | ||
666 | /* | |
667 | * Set open files limit to unlimited. This daemon can open a large number of | |
668 | * file descriptors in order to consumer multiple kernel traces. | |
669 | */ | |
670 | static void set_ulimit(void) | |
671 | { | |
672 | int ret; | |
673 | struct rlimit lim; | |
674 | ||
675 | /* | |
676 | * If not root, we cannot increase our max open files. But our | |
677 | * scope is then limited to processes from a single user. | |
678 | */ | |
679 | if (getuid() != 0) | |
680 | return; | |
681 | /* The kernel does not allowed an infinite limit for open files */ | |
682 | lim.rlim_cur = 65535; | |
683 | lim.rlim_max = 65535; | |
684 | ||
685 | ret = setrlimit(RLIMIT_NOFILE, &lim); | |
686 | if (ret < 0) { | |
687 | perror("failed to set open files limit"); | |
688 | } | |
689 | } | |
690 | ||
691 | int main(int argc, char **argv) | |
692 | { | |
693 | const char *home_dir; | |
694 | int ret, wait_shm_fd; | |
695 | struct sigaction act; | |
fb50c39d | 696 | mode_t old_umask = 0; |
f0966704 MD |
697 | |
698 | set_ulimit(); | |
699 | ||
700 | /* Ignore sigpipe */ | |
701 | memset(&act, 0, sizeof(act)); | |
702 | ret = sigemptyset(&act.sa_mask); | |
703 | if (ret == -1) { | |
704 | perror("sigemptyset"); | |
705 | return -1; | |
706 | } | |
707 | ||
708 | act.sa_handler = SIG_IGN; | |
709 | ret = sigaction(SIGPIPE, &act, NULL); | |
710 | if (ret == -1) { | |
711 | perror("sigaction"); | |
712 | return -1; | |
713 | } | |
714 | ||
715 | /* Handle SIGTERM */ | |
716 | act.sa_handler = handle_signals; | |
717 | ret = sigaction(SIGTERM, &act, NULL); | |
718 | if (ret == -1) { | |
719 | perror("sigaction"); | |
720 | return -1; | |
721 | } | |
722 | /* Handle SIGINT */ | |
723 | ret = sigaction(SIGINT, &act, NULL); | |
724 | if (ret == -1) { | |
725 | perror("sigaction"); | |
726 | return -1; | |
727 | } | |
728 | ||
729 | if (geteuid() == 0) { | |
730 | ret = mkdir(LTTNG_RUNDIR, S_IRWXU | S_IRWXG | S_IROTH | S_IXOTH); | |
731 | if (ret && errno != EEXIST) { | |
732 | perror("mkdir"); | |
733 | return -1; | |
734 | } | |
735 | wait_shm_fd = get_wait_shm(DEFAULT_GLOBAL_APPS_WAIT_SHM_PATH, | |
736 | sysconf(_SC_PAGE_SIZE), 1); | |
737 | if (wait_shm_fd < 0) { | |
738 | perror("global wait shm error"); | |
739 | return -1; | |
740 | } | |
741 | strcpy(apps_sock_path, DEFAULT_GLOBAL_APPS_UNIX_SOCK); | |
742 | old_umask = umask(0); | |
743 | } else { | |
744 | snprintf(local_apps_wait_shm_path, PATH_MAX, | |
745 | DEFAULT_HOME_APPS_WAIT_SHM_PATH, getuid()); | |
746 | wait_shm_fd = get_wait_shm(local_apps_wait_shm_path, | |
747 | sysconf(_SC_PAGE_SIZE), 0); | |
748 | if (wait_shm_fd < 0) { | |
749 | perror("local wait shm error"); | |
750 | return -1; | |
751 | } | |
752 | home_dir = (const char *) getenv("HOME"); | |
753 | if (!home_dir) { | |
754 | perror("getenv error"); | |
755 | return -ENOENT; | |
756 | } | |
757 | snprintf(apps_sock_path, PATH_MAX, | |
758 | DEFAULT_HOME_APPS_UNIX_SOCK, home_dir); | |
759 | } | |
760 | ||
57773204 | 761 | ret = ustcomm_create_unix_sock(apps_sock_path); |
f0966704 MD |
762 | if (ret < 0) { |
763 | perror("create error"); | |
764 | return ret; | |
765 | } | |
766 | apps_socket = ret; | |
767 | ||
768 | if (getuid() == 0) { | |
769 | /* File permission MUST be 666 */ | |
770 | ret = chmod(apps_sock_path, | |
771 | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH); | |
772 | if (ret < 0) { | |
773 | printf("Set file permissions failed: %s\n", apps_sock_path); | |
774 | perror("chmod"); | |
775 | goto end; | |
776 | } | |
777 | umask(old_umask); | |
778 | } | |
57773204 | 779 | ret = ustcomm_listen_unix_sock(apps_socket); |
f0966704 MD |
780 | if (ret < 0) { |
781 | perror("listen error"); | |
782 | return ret; | |
783 | } | |
784 | ||
785 | /* wake up futexes */ | |
786 | ret = update_futex(wait_shm_fd, 1); | |
787 | if (ret) { | |
788 | fprintf(stderr, "Error wakeup futex\n"); | |
789 | return -1; | |
790 | } | |
791 | ||
792 | for (;;) { | |
793 | int sock; | |
794 | ssize_t len; | |
795 | struct { | |
796 | uint32_t major; | |
797 | uint32_t minor; | |
798 | pid_t pid; | |
799 | pid_t ppid; | |
800 | uid_t uid; | |
801 | gid_t gid; | |
802 | char name[16]; /* Process name */ | |
803 | } reg_msg; | |
804 | char bufname[17]; | |
805 | ||
806 | if (quit_program) | |
807 | break; | |
808 | ||
809 | printf("Accepting application registration\n"); | |
57773204 | 810 | sock = ustcomm_accept_unix_sock(apps_socket); |
f0966704 MD |
811 | if (sock < 0) { |
812 | perror("accept error"); | |
813 | goto end; | |
814 | } | |
815 | ||
816 | /* | |
817 | * Basic recv here to handle the very simple data | |
818 | * that the libust send to register (reg_msg). | |
819 | */ | |
57773204 | 820 | len = ustcomm_recv_unix_sock(sock, ®_msg, sizeof(reg_msg)); |
f0966704 | 821 | if (len < 0 || len != sizeof(reg_msg)) { |
57773204 | 822 | perror("ustcomm_recv_unix_sock"); |
f0966704 MD |
823 | continue; |
824 | } | |
825 | memcpy(bufname, reg_msg.name, 16); | |
826 | bufname[16] = '\0'; | |
827 | printf("Application %s pid %u ppid %u uid %u gid %u has registered (version : %u.%u)\n", | |
828 | bufname, reg_msg.pid, reg_msg.ppid, reg_msg.uid, | |
829 | reg_msg.gid, reg_msg.major, reg_msg.minor); | |
830 | ret = send_app_msgs(sock); | |
831 | if (ret) { | |
832 | printf("Error in send_app_msgs.\n"); | |
833 | sleep(1); | |
834 | } | |
835 | close(sock); | |
836 | } | |
837 | ||
838 | end: | |
839 | printf("quitting.\n"); | |
840 | /* Let applications know we are not responding anymore */ | |
841 | ret = update_futex(wait_shm_fd, 0); | |
842 | if (ret) { | |
843 | fprintf(stderr, "Error wakeup futex\n"); | |
844 | return -1; | |
845 | } | |
846 | ||
847 | return 0; | |
848 | } |