Commit | Line | Data |
---|---|---|
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 | * | |
e92f3e28 MD |
7 | * This program is free software; you can redistribute it and/or modify |
8 | * it under the terms of the GNU General Public License as published by | |
9 | * the Free Software Foundation; version 2 of the License only. | |
f0966704 | 10 | * |
e92f3e28 MD |
11 | * This program is distributed in the hope that it will be useful, |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
f0966704 | 15 | * |
e92f3e28 MD |
16 | * You should have received a copy of the GNU General Public License along |
17 | * with this program; if not, write to the Free Software Foundation, Inc., | |
18 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
f0966704 MD |
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> | |
07dd0d60 MD |
31 | #include <sys/time.h> |
32 | #include <sys/resource.h> | |
f0966704 MD |
33 | #include <sys/stat.h> |
34 | #include <fcntl.h> | |
35 | #include <sys/mman.h> | |
36 | #include <limits.h> | |
37 | #include <urcu/futex.h> | |
38 | #include <urcu/uatomic.h> | |
39 | #include <assert.h> | |
40 | #include <sys/socket.h> | |
41 | ||
a3bb4b27 | 42 | #include <ust-comm.h> |
f0966704 MD |
43 | #include <../../libringbuffer/backend.h> |
44 | #include <../../libringbuffer/frontend.h> | |
45 | ||
46 | #define NR_SESSIONS 4 | |
47 | #define NR_CHANNELS 1 | |
48 | #define MAX_NR_STREAMS 64 | |
49 | #define NR_EVENTS 3 | |
50 | ||
51 | const char *evname[] = { | |
52 | "ust_tests_hello_tptest", | |
53 | "ust_tests_hello_tptest_sighandler", | |
54 | "ust_tests_hello_dontexist", | |
55 | }; | |
56 | ||
f0966704 | 57 | static int session_handle[NR_SESSIONS]; |
61f02aea MD |
58 | static struct lttng_ust_object_data metadata_stream_data[NR_SESSIONS]; |
59 | static struct lttng_ust_object_data metadata_data[NR_SESSIONS]; | |
60 | static struct lttng_ust_object_data channel_data[NR_SESSIONS][NR_CHANNELS]; | |
61 | static struct lttng_ust_object_data stream_data[NR_SESSIONS][NR_CHANNELS][MAX_NR_STREAMS]; | |
f0966704 MD |
62 | static int event_handle[NR_SESSIONS][NR_CHANNELS][NR_EVENTS]; |
63 | ||
64 | static int apps_socket = -1; | |
65 | static char apps_sock_path[PATH_MAX]; | |
66 | static char local_apps_wait_shm_path[PATH_MAX]; | |
67 | ||
68 | static volatile int quit_program; | |
69 | ||
70 | static void handle_signals(int signo) | |
71 | { | |
72 | quit_program = 1; | |
73 | } | |
74 | ||
f0966704 | 75 | static |
61f02aea | 76 | int open_streams(int sock, int channel_handle, struct lttng_ust_object_data *stream_datas, |
f0966704 MD |
77 | int nr_check) |
78 | { | |
79 | int ret, k = 0; | |
80 | ||
81 | for (;;) { | |
57773204 MD |
82 | struct ustcomm_ust_msg lum; |
83 | struct ustcomm_ust_reply lur; | |
f0966704 MD |
84 | |
85 | memset(&lum, 0, sizeof(lum)); | |
86 | lum.handle = channel_handle; | |
87 | lum.cmd = LTTNG_UST_STREAM; | |
57773204 | 88 | ret = ustcomm_send_app_cmd(sock, &lum, &lur); |
f0966704 MD |
89 | if (!ret) { |
90 | assert(k < nr_check); | |
91 | stream_datas[k].handle = lur.ret_val; | |
92 | printf("received stream handle %u\n", | |
93 | stream_datas[k].handle); | |
57773204 | 94 | if (lur.ret_code == USTCOMM_OK) { |
f0966704 MD |
95 | ssize_t len; |
96 | ||
97 | stream_datas[k].memory_map_size = lur.u.stream.memory_map_size; | |
98 | /* get shm fd */ | |
57773204 | 99 | len = ustcomm_recv_fd(sock); |
f0966704 MD |
100 | if (len < 0) |
101 | return -EINVAL; | |
102 | stream_datas[k].shm_fd = len; | |
103 | /* get wait fd */ | |
57773204 | 104 | len = ustcomm_recv_fd(sock); |
f0966704 MD |
105 | if (len < 0) |
106 | return -EINVAL; | |
107 | stream_datas[k].wait_fd = len; | |
108 | } | |
109 | k++; | |
110 | } | |
111 | if (ret == -ENOENT) | |
112 | break; | |
113 | if (ret) | |
114 | return ret; | |
115 | } | |
116 | return 0; | |
117 | } | |
118 | ||
119 | static | |
61f02aea | 120 | int close_streams(int sock, struct lttng_ust_object_data *stream_datas, int nr_check) |
f0966704 MD |
121 | { |
122 | int ret, k; | |
123 | ||
124 | for (k = 0; k < nr_check; k++) { | |
57773204 MD |
125 | struct ustcomm_ust_msg lum; |
126 | struct ustcomm_ust_reply lur; | |
f0966704 MD |
127 | |
128 | if (!stream_datas[k].handle) | |
129 | continue; | |
130 | memset(&lum, 0, sizeof(lum)); | |
131 | lum.handle = stream_datas[k].handle; | |
132 | lum.cmd = LTTNG_UST_RELEASE; | |
57773204 | 133 | ret = ustcomm_send_app_cmd(sock, &lum, &lur); |
f0966704 MD |
134 | if (ret) { |
135 | printf("Error closing stream\n"); | |
136 | return ret; | |
137 | } | |
138 | if (stream_datas[k].shm_fd >= 0) { | |
139 | ret = close(stream_datas[k].shm_fd); | |
140 | if (ret) { | |
141 | printf("Error closing stream shm_fd\n"); | |
142 | return ret; | |
143 | } | |
144 | } | |
145 | if (stream_datas[k].wait_fd >= 0) { | |
146 | ret = close(stream_datas[k].wait_fd); | |
147 | if (ret) { | |
148 | printf("Error closing stream wait_fd\n"); | |
149 | return ret; | |
150 | } | |
151 | } | |
152 | } | |
153 | return 0; | |
154 | } | |
155 | ||
156 | static | |
38fae1d3 | 157 | struct lttng_ust_shm_handle *map_channel(struct lttng_ust_object_data *chan_data, |
61f02aea | 158 | struct lttng_ust_object_data *stream_datas, int nr_check) |
f0966704 | 159 | { |
38fae1d3 | 160 | struct lttng_ust_shm_handle *handle; |
f0966704 MD |
161 | struct channel *chan; |
162 | int k, ret; | |
163 | ||
164 | /* map metadata channel */ | |
165 | handle = channel_handle_create(chan_data->shm_fd, | |
166 | chan_data->wait_fd, | |
167 | chan_data->memory_map_size); | |
168 | if (!handle) { | |
169 | printf("create handle error\n"); | |
170 | return NULL; | |
171 | } | |
172 | chan_data->shm_fd = -1; | |
173 | chan_data->wait_fd = -1; | |
174 | chan = shmp(handle, handle->chan); | |
175 | ||
176 | for (k = 0; k < nr_check; k++) { | |
61f02aea | 177 | struct lttng_ust_object_data *stream_data = &stream_datas[k]; |
f0966704 MD |
178 | |
179 | if (!stream_data->handle) | |
180 | break; | |
181 | /* map stream */ | |
182 | ret = channel_handle_add_stream(handle, | |
183 | stream_data->shm_fd, | |
184 | stream_data->wait_fd, | |
185 | stream_data->memory_map_size); | |
186 | if (ret) { | |
187 | printf("add stream error\n"); | |
188 | goto error_destroy; | |
189 | } | |
190 | stream_data->shm_fd = -1; | |
191 | stream_data->wait_fd = -1; | |
192 | } | |
193 | return handle; | |
194 | ||
195 | error_destroy: | |
196 | channel_destroy(chan, handle, 1); | |
197 | return NULL; | |
198 | } | |
199 | ||
200 | static | |
38fae1d3 | 201 | void unmap_channel(struct lttng_ust_shm_handle *handle) |
f0966704 MD |
202 | { |
203 | struct channel *chan; | |
204 | ||
205 | chan = shmp(handle, handle->chan); | |
206 | /* unmap channel */ | |
207 | channel_destroy(chan, handle, 1); | |
208 | } | |
209 | ||
210 | static | |
38fae1d3 | 211 | int consume_stream(struct lttng_ust_shm_handle *handle, int cpu, char *outfile) |
f0966704 MD |
212 | { |
213 | struct channel *chan; | |
4cfec15c | 214 | struct lttng_ust_lib_ring_buffer *buf; |
f0966704 | 215 | int outfd, ret; |
ef9ff354 MD |
216 | int *shm_fd, *wait_fd; |
217 | uint64_t *memory_map_size; | |
f0966704 MD |
218 | |
219 | chan = shmp(handle, handle->chan); | |
220 | ||
221 | /* open stream */ | |
222 | buf = channel_get_ring_buffer(&chan->backend.config, | |
223 | chan, cpu, handle, &shm_fd, &wait_fd, &memory_map_size); | |
224 | if (!buf) | |
225 | return -ENOENT; | |
226 | ret = lib_ring_buffer_open_read(buf, handle, 1); | |
227 | if (ret) { | |
228 | return -1; | |
229 | } | |
230 | ||
231 | /* copy */ | |
72aa0d36 | 232 | outfd = open(outfile, O_WRONLY | O_CREAT | O_LARGEFILE | O_TRUNC, |
f0966704 MD |
233 | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); |
234 | if (outfd < 0) { | |
235 | perror("open output"); | |
236 | return -1; | |
237 | } | |
238 | ||
239 | printf("Waiting for buffer data for %s\n", outfile); | |
240 | for (;;) { | |
241 | unsigned long read_size; | |
242 | unsigned long copy_size; | |
243 | char *ptr; | |
244 | ||
245 | ret = lib_ring_buffer_get_next_subbuf(buf, handle); | |
246 | printf("get next ret %d\n", ret); | |
247 | if (ret == -ENODATA) | |
248 | break; | |
249 | if (ret == -EAGAIN) { | |
250 | sleep(1); | |
251 | continue; | |
252 | } | |
253 | if (ret) { | |
254 | printf("Error %d in lib_ring_buffer_get_next_subbuf\n", ret); | |
255 | return -1; | |
256 | } | |
257 | read_size = lib_ring_buffer_get_read_data_size( | |
258 | &chan->backend.config, buf, handle); | |
259 | read_size = PAGE_ALIGN(read_size); | |
260 | ptr = lib_ring_buffer_read_offset_address( | |
261 | &buf->backend, 0, handle); | |
262 | printf("WRITE: copy %lu bytes\n", read_size); | |
263 | copy_size = write(outfd, ptr, read_size); | |
264 | if (copy_size < read_size) { | |
361dedfb | 265 | printf("write issue: copied %lu, expected %lu\n", copy_size, read_size); |
f0966704 MD |
266 | } |
267 | lib_ring_buffer_put_next_subbuf(buf, handle); | |
268 | } | |
269 | ||
270 | ret = close(outfd); | |
271 | if (ret) { | |
272 | perror("close"); | |
273 | return -1; | |
274 | } | |
275 | ||
276 | /* close stream */ | |
277 | lib_ring_buffer_release_read(buf, handle, 1); | |
278 | return 0; | |
279 | } | |
280 | ||
281 | static | |
282 | int consume_buffers(void) | |
283 | { | |
284 | int i, j, k, ret; | |
285 | mode_t old_umask; | |
286 | ||
287 | for (i = 0; i < NR_SESSIONS; i++) { | |
288 | char pathname[PATH_MAX]; | |
38fae1d3 | 289 | struct lttng_ust_shm_handle *handle; |
f0966704 MD |
290 | |
291 | snprintf(pathname, PATH_MAX - 1, "/tmp/testtrace%u", i); | |
292 | old_umask = umask(0); | |
293 | ret = mkdir(pathname, S_IRWXU | S_IRWXG); | |
294 | if (ret && errno != EEXIST) { | |
295 | perror("mkdir"); | |
296 | umask(old_umask); | |
297 | return -1; | |
298 | } | |
299 | umask(old_umask); | |
300 | ||
301 | /* copy metadata */ | |
302 | handle = map_channel(&metadata_data[i], | |
303 | &metadata_stream_data[i], 1); | |
304 | if (!handle) | |
305 | return -1; | |
306 | snprintf(pathname, PATH_MAX - 1, | |
307 | "/tmp/testtrace%u/metadata", i); | |
308 | ret = consume_stream(handle, -1, pathname); | |
309 | if (ret && ret != -ENOENT) { | |
310 | printf("Error in consume_stream\n"); | |
311 | return ret; | |
312 | } | |
313 | unmap_channel(handle); | |
314 | ||
315 | /* copy binary data */ | |
316 | for (j = 0; j < NR_CHANNELS; j++) { | |
317 | handle = map_channel(&channel_data[i][j], | |
318 | stream_data[i][j], MAX_NR_STREAMS); | |
319 | if (!handle) | |
320 | return -1; | |
321 | for (k = 0; k < MAX_NR_STREAMS; k++) { | |
322 | snprintf(pathname, PATH_MAX - 1, | |
323 | "/tmp/testtrace%u/data_%u", i, k); | |
324 | ret = consume_stream(handle, k, pathname); | |
325 | if (ret && ret != -ENOENT) { | |
326 | printf("Error in consume_stream\n"); | |
327 | return ret; | |
328 | } | |
329 | } | |
330 | unmap_channel(handle); | |
331 | } | |
332 | } | |
333 | ||
334 | return 0; | |
335 | } | |
336 | ||
337 | int send_app_msgs(int sock) | |
338 | { | |
57773204 MD |
339 | struct ustcomm_ust_msg lum; |
340 | struct ustcomm_ust_reply lur; | |
f0966704 MD |
341 | int ret, i, j, k; |
342 | ||
343 | for (i = 0; i < NR_SESSIONS; i++) { | |
344 | /* Create session */ | |
345 | memset(&lum, 0, sizeof(lum)); | |
346 | lum.handle = LTTNG_UST_ROOT_HANDLE; | |
347 | lum.cmd = LTTNG_UST_SESSION; | |
57773204 | 348 | ret = ustcomm_send_app_cmd(sock, &lum, &lur); |
f0966704 MD |
349 | if (ret) |
350 | return ret; | |
351 | session_handle[i] = lur.ret_val; | |
352 | printf("received session handle %u\n", session_handle[i]); | |
353 | ||
354 | /* Create metadata channel */ | |
355 | memset(&lum, 0, sizeof(lum)); | |
356 | lum.handle = session_handle[i]; | |
357 | lum.cmd = LTTNG_UST_METADATA; | |
358 | lum.u.channel.overwrite = 0; | |
359 | lum.u.channel.subbuf_size = 32768; | |
360 | lum.u.channel.num_subbuf = 4; | |
361 | lum.u.channel.switch_timer_interval = 0; | |
362 | lum.u.channel.read_timer_interval = 0; | |
363 | lum.u.channel.output = LTTNG_UST_MMAP; | |
57773204 | 364 | ret = ustcomm_send_app_cmd(sock, &lum, &lur); |
f0966704 MD |
365 | if (ret) |
366 | return ret; | |
367 | metadata_data[i].handle = lur.ret_val; | |
368 | printf("received metadata handle %u\n", metadata_data[i].handle); | |
57773204 | 369 | if (lur.ret_code == USTCOMM_OK) { |
f0966704 MD |
370 | ssize_t len; |
371 | ||
372 | metadata_data[i].memory_map_size = lur.u.channel.memory_map_size; | |
373 | /* get shm fd */ | |
57773204 | 374 | len = ustcomm_recv_fd(sock); |
f0966704 MD |
375 | if (len < 0) |
376 | return -EINVAL; | |
377 | metadata_data[i].shm_fd = len; | |
378 | /* get wait fd */ | |
57773204 | 379 | len = ustcomm_recv_fd(sock); |
f0966704 MD |
380 | if (len < 0) |
381 | return -EINVAL; | |
382 | metadata_data[i].wait_fd = len; | |
383 | } | |
384 | ||
385 | ret = open_streams(sock, metadata_data[i].handle, | |
386 | &metadata_stream_data[i], 1); | |
387 | if (ret) { | |
388 | printf("Error in open_streams\n"); | |
389 | return ret; | |
390 | } | |
391 | ||
392 | /* Create channels */ | |
393 | for (j = 0; j < NR_CHANNELS; j++) { | |
394 | memset(&lum, 0, sizeof(lum)); | |
395 | lum.handle = session_handle[i]; | |
396 | lum.cmd = LTTNG_UST_CHANNEL; | |
397 | //lum.u.channel.overwrite = 0; | |
398 | lum.u.channel.overwrite = 1; | |
399 | lum.u.channel.subbuf_size = 32768; | |
400 | lum.u.channel.num_subbuf = 8; | |
401 | //lum.u.channel.num_subbuf = 4; | |
402 | //lum.u.channel.num_subbuf = 2; | |
403 | lum.u.channel.switch_timer_interval = 0; | |
404 | lum.u.channel.read_timer_interval = 0; | |
405 | lum.u.channel.output = LTTNG_UST_MMAP; | |
57773204 | 406 | ret = ustcomm_send_app_cmd(sock, &lum, &lur); |
f0966704 MD |
407 | if (ret) |
408 | return ret; | |
409 | channel_data[i][j].handle = lur.ret_val; | |
410 | printf("received channel handle %u\n", channel_data[i][j].handle); | |
57773204 | 411 | if (lur.ret_code == USTCOMM_OK) { |
f0966704 MD |
412 | ssize_t len; |
413 | ||
414 | channel_data[i][j].memory_map_size = lur.u.channel.memory_map_size; | |
415 | /* get shm fd */ | |
57773204 | 416 | len = ustcomm_recv_fd(sock); |
f0966704 MD |
417 | if (len < 0) |
418 | return -EINVAL; | |
419 | channel_data[i][j].shm_fd = len; | |
420 | /* get wait fd */ | |
57773204 | 421 | len = ustcomm_recv_fd(sock); |
f0966704 MD |
422 | if (len < 0) |
423 | return -EINVAL; | |
424 | channel_data[i][j].wait_fd = len; | |
425 | } | |
426 | ||
427 | /* Create events */ | |
428 | for (k = 0; k < NR_EVENTS; k++) { | |
429 | memset(&lum, 0, sizeof(lum)); | |
430 | lum.handle = channel_data[i][j].handle; | |
431 | lum.cmd = LTTNG_UST_EVENT; | |
432 | strncpy(lum.u.event.name, evname[k], | |
433 | LTTNG_UST_SYM_NAME_LEN); | |
434 | lum.u.event.instrumentation = LTTNG_UST_TRACEPOINT; | |
57773204 | 435 | ret = ustcomm_send_app_cmd(sock, &lum, &lur); |
f0966704 MD |
436 | if (ret) |
437 | return ret; | |
438 | event_handle[i][j][k] = lur.ret_val; | |
439 | printf("received event handle %u\n", event_handle[i][j][k]); | |
440 | } | |
441 | ||
442 | /* Get references to channel streams */ | |
443 | ret = open_streams(sock, channel_data[i][j].handle, | |
444 | stream_data[i][j], MAX_NR_STREAMS); | |
445 | if (ret) { | |
446 | printf("Error in open_streams\n"); | |
447 | return ret; | |
448 | } | |
449 | } | |
450 | ||
451 | memset(&lum, 0, sizeof(lum)); | |
452 | lum.handle = session_handle[i]; | |
453 | lum.cmd = LTTNG_UST_SESSION_START; | |
57773204 | 454 | ret = ustcomm_send_app_cmd(sock, &lum, &lur); |
f0966704 MD |
455 | if (ret) |
456 | return ret; | |
457 | printf("Session handle %u started.\n", session_handle[i]); | |
458 | } | |
459 | ||
460 | /* Tell application registration is done */ | |
461 | memset(&lum, 0, sizeof(lum)); | |
462 | lum.handle = LTTNG_UST_ROOT_HANDLE; | |
463 | lum.cmd = LTTNG_UST_REGISTER_DONE; | |
57773204 | 464 | ret = ustcomm_send_app_cmd(sock, &lum, &lur); |
f0966704 MD |
465 | if (ret) |
466 | return ret; | |
467 | printf("Registration done acknowledged.\n"); | |
468 | ||
469 | sleep(4); | |
470 | ||
471 | ret = consume_buffers(); | |
472 | if (ret) { | |
473 | printf("Error in consume_buffers\n"); | |
474 | return ret; | |
475 | } | |
476 | ||
477 | for (i = 0; i < NR_SESSIONS; i++) { | |
478 | /* Release channels */ | |
479 | for (j = 0; j < NR_CHANNELS; j++) { | |
480 | /* Release streams */ | |
481 | ret = close_streams(sock, stream_data[i][j], | |
482 | MAX_NR_STREAMS); | |
483 | if (ret) | |
484 | return ret; | |
485 | ||
486 | /* Release events */ | |
487 | for (k = 0; k < NR_EVENTS; k++) { | |
488 | memset(&lum, 0, sizeof(lum)); | |
489 | lum.handle = event_handle[i][j][k]; | |
490 | lum.cmd = LTTNG_UST_RELEASE; | |
57773204 | 491 | ret = ustcomm_send_app_cmd(sock, &lum, &lur); |
f0966704 MD |
492 | if (ret) |
493 | return ret; | |
494 | } | |
495 | memset(&lum, 0, sizeof(lum)); | |
496 | lum.handle = channel_data[i][j].handle; | |
497 | lum.cmd = LTTNG_UST_RELEASE; | |
57773204 | 498 | ret = ustcomm_send_app_cmd(sock, &lum, &lur); |
f0966704 MD |
499 | if (ret) |
500 | return ret; | |
501 | if (channel_data[i][j].shm_fd >= 0) { | |
502 | ret = close(channel_data[i][j].shm_fd); | |
503 | if (ret) | |
504 | return ret; | |
505 | } | |
506 | if (channel_data[i][j].wait_fd >= 0) { | |
507 | ret = close(channel_data[i][j].wait_fd); | |
508 | if (ret) | |
509 | return ret; | |
510 | } | |
511 | } | |
512 | ||
513 | /* Release metadata channel */ | |
514 | ret = close_streams(sock, &metadata_stream_data[i], 1); | |
515 | if (ret) | |
516 | return ret; | |
517 | ||
518 | memset(&lum, 0, sizeof(lum)); | |
519 | lum.handle = metadata_data[i].handle; | |
520 | lum.cmd = LTTNG_UST_RELEASE; | |
57773204 | 521 | ret = ustcomm_send_app_cmd(sock, &lum, &lur); |
f0966704 MD |
522 | if (ret) |
523 | return ret; | |
524 | if (metadata_data[i].shm_fd >= 0) { | |
525 | ret = close(metadata_data[i].shm_fd); | |
526 | if (ret) | |
527 | return ret; | |
528 | } | |
529 | if (metadata_data[i].wait_fd >= 0) { | |
530 | ret = close(metadata_data[i].wait_fd); | |
531 | if (ret) | |
532 | return ret; | |
533 | } | |
534 | ||
535 | /* Release session */ | |
536 | memset(&lum, 0, sizeof(lum)); | |
537 | lum.handle = session_handle[i]; | |
538 | lum.cmd = LTTNG_UST_RELEASE; | |
57773204 | 539 | ret = ustcomm_send_app_cmd(sock, &lum, &lur); |
f0966704 MD |
540 | if (ret) |
541 | return ret; | |
542 | } | |
543 | ||
544 | return 0; | |
545 | } | |
546 | ||
547 | /* | |
548 | * Using fork to set umask in the child process (not multi-thread safe). We | |
549 | * deal with the shm_open vs ftruncate race (happening when the sessiond owns | |
550 | * the shm and does not let everybody modify it, to ensure safety against | |
551 | * shm_unlink) by simply letting the mmap fail and retrying after a few | |
552 | * seconds. For global shm, everybody has rw access to it until the sessiond | |
553 | * starts. | |
554 | */ | |
555 | static int get_wait_shm(char *shm_path, size_t mmap_size, int global) | |
556 | { | |
557 | int wait_shm_fd, ret; | |
558 | mode_t mode; | |
559 | ||
560 | /* Default permissions */ | |
561 | mode = S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP; | |
562 | ||
563 | /* Change owner of the shm path */ | |
564 | if (global) { | |
565 | ret = chown(shm_path, 0, 0); | |
566 | if (ret < 0) { | |
567 | if (errno != ENOENT) { | |
568 | perror("chown wait shm"); | |
569 | goto error; | |
570 | } | |
571 | } | |
572 | ||
573 | /* | |
574 | * If global session daemon, any application can register so the shm | |
575 | * needs to be set in read-only mode for others. | |
576 | */ | |
577 | mode |= S_IROTH; | |
578 | } else { | |
579 | ret = chown(shm_path, getuid(), getgid()); | |
580 | if (ret < 0) { | |
581 | if (errno != ENOENT) { | |
582 | perror("chown wait shm"); | |
583 | goto error; | |
584 | } | |
585 | } | |
586 | } | |
587 | ||
588 | /* | |
589 | * Set permissions to the shm even if we did not create the shm. | |
590 | */ | |
591 | ret = chmod(shm_path, mode); | |
592 | if (ret < 0) { | |
593 | if (errno != ENOENT) { | |
594 | perror("chmod wait shm"); | |
595 | goto error; | |
596 | } | |
597 | } | |
598 | ||
599 | /* | |
600 | * We're alone in a child process, so we can modify the process-wide | |
601 | * umask. | |
602 | */ | |
603 | umask(~mode); | |
604 | ||
605 | /* | |
606 | * Try creating shm (or get rw access). We don't do an exclusive open, | |
607 | * because we allow other processes to create+ftruncate it concurrently. | |
608 | */ | |
609 | wait_shm_fd = shm_open(shm_path, O_RDWR | O_CREAT, mode); | |
610 | if (wait_shm_fd < 0) { | |
611 | perror("shm_open wait shm"); | |
612 | goto error; | |
613 | } | |
614 | ||
615 | ret = ftruncate(wait_shm_fd, mmap_size); | |
616 | if (ret < 0) { | |
617 | perror("ftruncate wait shm"); | |
618 | exit(EXIT_FAILURE); | |
619 | } | |
620 | ||
621 | ret = fchmod(wait_shm_fd, mode); | |
622 | if (ret < 0) { | |
623 | perror("fchmod"); | |
624 | exit(EXIT_FAILURE); | |
625 | } | |
626 | ||
627 | printf("Got the wait shm fd %d\n", wait_shm_fd); | |
628 | ||
629 | return wait_shm_fd; | |
630 | ||
631 | error: | |
632 | printf("Failing to get the wait shm fd\n"); | |
633 | ||
634 | return -1; | |
635 | } | |
636 | ||
637 | int update_futex(int fd, int active) | |
638 | { | |
639 | size_t mmap_size = sysconf(_SC_PAGE_SIZE); | |
640 | char *wait_shm_mmap; | |
641 | int ret; | |
642 | ||
643 | wait_shm_mmap = mmap(NULL, mmap_size, PROT_READ | PROT_WRITE, | |
644 | MAP_SHARED, fd, 0); | |
645 | if (wait_shm_mmap == MAP_FAILED) { | |
646 | perror("mmap"); | |
647 | goto error; | |
648 | } | |
649 | ||
650 | if (active) { | |
651 | uatomic_set((int32_t *) wait_shm_mmap, 1); | |
652 | futex_async((int32_t *) wait_shm_mmap, FUTEX_WAKE, | |
653 | INT_MAX, NULL, NULL, 0); | |
654 | } else { | |
655 | uatomic_set((int32_t *) wait_shm_mmap, 0); | |
656 | } | |
657 | ret = munmap(wait_shm_mmap, mmap_size); | |
658 | if (ret) { | |
659 | perror("Error unmapping wait shm"); | |
660 | goto error; | |
661 | } | |
662 | return 0; | |
663 | error: | |
664 | return -1; | |
665 | } | |
666 | ||
667 | /* | |
668 | * Set open files limit to unlimited. This daemon can open a large number of | |
669 | * file descriptors in order to consumer multiple kernel traces. | |
670 | */ | |
671 | static void set_ulimit(void) | |
672 | { | |
673 | int ret; | |
674 | struct rlimit lim; | |
675 | ||
676 | /* | |
677 | * If not root, we cannot increase our max open files. But our | |
678 | * scope is then limited to processes from a single user. | |
679 | */ | |
680 | if (getuid() != 0) | |
681 | return; | |
682 | /* The kernel does not allowed an infinite limit for open files */ | |
683 | lim.rlim_cur = 65535; | |
684 | lim.rlim_max = 65535; | |
685 | ||
686 | ret = setrlimit(RLIMIT_NOFILE, &lim); | |
687 | if (ret < 0) { | |
688 | perror("failed to set open files limit"); | |
689 | } | |
690 | } | |
691 | ||
692 | int main(int argc, char **argv) | |
693 | { | |
694 | const char *home_dir; | |
695 | int ret, wait_shm_fd; | |
696 | struct sigaction act; | |
fb50c39d | 697 | mode_t old_umask = 0; |
f0966704 MD |
698 | |
699 | set_ulimit(); | |
700 | ||
701 | /* Ignore sigpipe */ | |
702 | memset(&act, 0, sizeof(act)); | |
703 | ret = sigemptyset(&act.sa_mask); | |
704 | if (ret == -1) { | |
705 | perror("sigemptyset"); | |
706 | return -1; | |
707 | } | |
708 | ||
709 | act.sa_handler = SIG_IGN; | |
710 | ret = sigaction(SIGPIPE, &act, NULL); | |
711 | if (ret == -1) { | |
712 | perror("sigaction"); | |
713 | return -1; | |
714 | } | |
715 | ||
716 | /* Handle SIGTERM */ | |
717 | act.sa_handler = handle_signals; | |
718 | ret = sigaction(SIGTERM, &act, NULL); | |
719 | if (ret == -1) { | |
720 | perror("sigaction"); | |
721 | return -1; | |
722 | } | |
723 | /* Handle SIGINT */ | |
724 | ret = sigaction(SIGINT, &act, NULL); | |
725 | if (ret == -1) { | |
726 | perror("sigaction"); | |
727 | return -1; | |
728 | } | |
729 | ||
730 | if (geteuid() == 0) { | |
731 | ret = mkdir(LTTNG_RUNDIR, S_IRWXU | S_IRWXG | S_IROTH | S_IXOTH); | |
732 | if (ret && errno != EEXIST) { | |
733 | perror("mkdir"); | |
734 | return -1; | |
735 | } | |
736 | wait_shm_fd = get_wait_shm(DEFAULT_GLOBAL_APPS_WAIT_SHM_PATH, | |
737 | sysconf(_SC_PAGE_SIZE), 1); | |
738 | if (wait_shm_fd < 0) { | |
739 | perror("global wait shm error"); | |
740 | return -1; | |
741 | } | |
742 | strcpy(apps_sock_path, DEFAULT_GLOBAL_APPS_UNIX_SOCK); | |
743 | old_umask = umask(0); | |
744 | } else { | |
745 | snprintf(local_apps_wait_shm_path, PATH_MAX, | |
746 | DEFAULT_HOME_APPS_WAIT_SHM_PATH, getuid()); | |
747 | wait_shm_fd = get_wait_shm(local_apps_wait_shm_path, | |
748 | sysconf(_SC_PAGE_SIZE), 0); | |
749 | if (wait_shm_fd < 0) { | |
750 | perror("local wait shm error"); | |
751 | return -1; | |
752 | } | |
753 | home_dir = (const char *) getenv("HOME"); | |
754 | if (!home_dir) { | |
755 | perror("getenv error"); | |
756 | return -ENOENT; | |
757 | } | |
758 | snprintf(apps_sock_path, PATH_MAX, | |
759 | DEFAULT_HOME_APPS_UNIX_SOCK, home_dir); | |
760 | } | |
761 | ||
57773204 | 762 | ret = ustcomm_create_unix_sock(apps_sock_path); |
f0966704 MD |
763 | if (ret < 0) { |
764 | perror("create error"); | |
765 | return ret; | |
766 | } | |
767 | apps_socket = ret; | |
768 | ||
769 | if (getuid() == 0) { | |
770 | /* File permission MUST be 666 */ | |
771 | ret = chmod(apps_sock_path, | |
772 | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH); | |
773 | if (ret < 0) { | |
774 | printf("Set file permissions failed: %s\n", apps_sock_path); | |
775 | perror("chmod"); | |
776 | goto end; | |
777 | } | |
778 | umask(old_umask); | |
779 | } | |
57773204 | 780 | ret = ustcomm_listen_unix_sock(apps_socket); |
f0966704 MD |
781 | if (ret < 0) { |
782 | perror("listen error"); | |
783 | return ret; | |
784 | } | |
785 | ||
786 | /* wake up futexes */ | |
787 | ret = update_futex(wait_shm_fd, 1); | |
788 | if (ret) { | |
789 | fprintf(stderr, "Error wakeup futex\n"); | |
790 | return -1; | |
791 | } | |
792 | ||
793 | for (;;) { | |
794 | int sock; | |
795 | ssize_t len; | |
796 | struct { | |
797 | uint32_t major; | |
798 | uint32_t minor; | |
799 | pid_t pid; | |
800 | pid_t ppid; | |
801 | uid_t uid; | |
802 | gid_t gid; | |
803 | char name[16]; /* Process name */ | |
804 | } reg_msg; | |
805 | char bufname[17]; | |
806 | ||
807 | if (quit_program) | |
808 | break; | |
809 | ||
810 | printf("Accepting application registration\n"); | |
57773204 | 811 | sock = ustcomm_accept_unix_sock(apps_socket); |
f0966704 MD |
812 | if (sock < 0) { |
813 | perror("accept error"); | |
814 | goto end; | |
815 | } | |
816 | ||
817 | /* | |
818 | * Basic recv here to handle the very simple data | |
819 | * that the libust send to register (reg_msg). | |
820 | */ | |
57773204 | 821 | len = ustcomm_recv_unix_sock(sock, ®_msg, sizeof(reg_msg)); |
f0966704 | 822 | if (len < 0 || len != sizeof(reg_msg)) { |
57773204 | 823 | perror("ustcomm_recv_unix_sock"); |
f0966704 MD |
824 | continue; |
825 | } | |
826 | memcpy(bufname, reg_msg.name, 16); | |
827 | bufname[16] = '\0'; | |
828 | printf("Application %s pid %u ppid %u uid %u gid %u has registered (version : %u.%u)\n", | |
829 | bufname, reg_msg.pid, reg_msg.ppid, reg_msg.uid, | |
830 | reg_msg.gid, reg_msg.major, reg_msg.minor); | |
831 | ret = send_app_msgs(sock); | |
832 | if (ret) { | |
833 | printf("Error in send_app_msgs.\n"); | |
834 | sleep(1); | |
835 | } | |
836 | close(sock); | |
837 | } | |
838 | ||
839 | end: | |
840 | printf("quitting.\n"); | |
841 | /* Let applications know we are not responding anymore */ | |
842 | ret = update_futex(wait_shm_fd, 0); | |
843 | if (ret) { | |
844 | fprintf(stderr, "Error wakeup futex\n"); | |
845 | return -1; | |
846 | } | |
847 | ||
848 | return 0; | |
849 | } |