Commit | Line | Data |
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b0a99af4 MD |
1 | /* |
2 | * ust-basic-tracing.c - Basic single-session, single-channel, single-process 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. | |
b0a99af4 | 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. | |
b0a99af4 | 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. | |
b0a99af4 MD |
19 | */ |
20 | ||
21 | #define _LARGEFILE64_SOURCE | |
9d335227 | 22 | #define _GNU_SOURCE |
b0a99af4 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> | |
07dd0d60 MD |
32 | #include <sys/time.h> |
33 | #include <sys/resource.h> | |
b0a99af4 MD |
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> |
b0a99af4 MD |
43 | #include "../../libringbuffer/backend.h" |
44 | #include "../../libringbuffer/frontend.h" | |
45 | ||
46 | #define MAX_NR_STREAMS 64 | |
47 | #define MAX_NR_EVENTS 128 | |
48 | ||
b0a99af4 | 49 | static int session_handle; |
61f02aea MD |
50 | static struct lttng_ust_object_data metadata_stream_data; |
51 | static struct lttng_ust_object_data metadata_data; | |
52 | static struct lttng_ust_object_data channel_data; | |
53 | static struct lttng_ust_object_data stream_data[MAX_NR_STREAMS]; | |
b0a99af4 | 54 | static int event_handle[MAX_NR_EVENTS]; |
8de38cf7 | 55 | static int context_handle; |
b0a99af4 MD |
56 | |
57 | static int apps_socket = -1; | |
58 | static char apps_sock_path[PATH_MAX]; | |
59 | static char local_apps_wait_shm_path[PATH_MAX]; | |
60 | ||
61 | static volatile int quit_program; | |
62 | ||
63 | static void handle_signals(int signo) | |
64 | { | |
65 | quit_program = 1; | |
66 | } | |
67 | ||
b0a99af4 | 68 | static |
61f02aea | 69 | int open_streams(int sock, int channel_handle, struct lttng_ust_object_data *stream_datas, |
b0a99af4 MD |
70 | int nr_check) |
71 | { | |
72 | int ret, k = 0; | |
73 | ||
74 | for (;;) { | |
57773204 MD |
75 | struct ustcomm_ust_msg lum; |
76 | struct ustcomm_ust_reply lur; | |
b0a99af4 MD |
77 | |
78 | memset(&lum, 0, sizeof(lum)); | |
79 | lum.handle = channel_handle; | |
80 | lum.cmd = LTTNG_UST_STREAM; | |
57773204 | 81 | ret = ustcomm_send_app_cmd(sock, &lum, &lur); |
b0a99af4 MD |
82 | if (!ret) { |
83 | assert(k < nr_check); | |
84 | stream_datas[k].handle = lur.ret_val; | |
85 | printf("received stream handle %u\n", | |
86 | stream_datas[k].handle); | |
57773204 | 87 | if (lur.ret_code == USTCOMM_OK) { |
b0a99af4 MD |
88 | ssize_t len; |
89 | ||
90 | stream_datas[k].memory_map_size = lur.u.stream.memory_map_size; | |
91 | /* get shm fd */ | |
57773204 | 92 | len = ustcomm_recv_fd(sock); |
b0a99af4 MD |
93 | if (len < 0) |
94 | return -EINVAL; | |
95 | stream_datas[k].shm_fd = len; | |
96 | /* get wait fd */ | |
57773204 | 97 | len = ustcomm_recv_fd(sock); |
b0a99af4 MD |
98 | if (len < 0) |
99 | return -EINVAL; | |
100 | stream_datas[k].wait_fd = len; | |
101 | } | |
102 | k++; | |
103 | } | |
104 | if (ret == -ENOENT) | |
105 | break; | |
106 | if (ret) | |
107 | return ret; | |
108 | } | |
109 | return 0; | |
110 | } | |
111 | ||
112 | static | |
61f02aea | 113 | int close_streams(int sock, struct lttng_ust_object_data *stream_datas, int nr_check) |
b0a99af4 MD |
114 | { |
115 | int ret, k; | |
116 | ||
117 | for (k = 0; k < nr_check; k++) { | |
57773204 MD |
118 | struct ustcomm_ust_msg lum; |
119 | struct ustcomm_ust_reply lur; | |
b0a99af4 MD |
120 | |
121 | if (!stream_datas[k].handle) | |
122 | continue; | |
123 | memset(&lum, 0, sizeof(lum)); | |
124 | lum.handle = stream_datas[k].handle; | |
125 | lum.cmd = LTTNG_UST_RELEASE; | |
57773204 | 126 | ret = ustcomm_send_app_cmd(sock, &lum, &lur); |
b0a99af4 MD |
127 | if (ret) { |
128 | printf("Error closing stream\n"); | |
129 | return ret; | |
130 | } | |
131 | if (stream_datas[k].shm_fd >= 0) { | |
132 | ret = close(stream_datas[k].shm_fd); | |
133 | if (ret) { | |
134 | printf("Error closing stream shm_fd\n"); | |
135 | return ret; | |
136 | } | |
137 | } | |
138 | if (stream_datas[k].wait_fd >= 0) { | |
139 | ret = close(stream_datas[k].wait_fd); | |
140 | if (ret) { | |
141 | printf("Error closing stream wait_fd\n"); | |
142 | return ret; | |
143 | } | |
144 | } | |
145 | } | |
146 | return 0; | |
147 | } | |
148 | ||
149 | static | |
38fae1d3 | 150 | struct lttng_ust_shm_handle *map_channel(struct lttng_ust_object_data *chan_data, |
61f02aea | 151 | struct lttng_ust_object_data *stream_datas, int nr_check) |
b0a99af4 | 152 | { |
38fae1d3 | 153 | struct lttng_ust_shm_handle *handle; |
b0a99af4 MD |
154 | struct channel *chan; |
155 | int k, ret; | |
156 | ||
157 | /* map metadata channel */ | |
158 | handle = channel_handle_create(chan_data->shm_fd, | |
159 | chan_data->wait_fd, | |
160 | chan_data->memory_map_size); | |
161 | if (!handle) { | |
162 | printf("create handle error\n"); | |
163 | return NULL; | |
164 | } | |
165 | chan_data->shm_fd = -1; | |
166 | chan_data->wait_fd = -1; | |
167 | chan = shmp(handle, handle->chan); | |
168 | ||
169 | for (k = 0; k < nr_check; k++) { | |
61f02aea | 170 | struct lttng_ust_object_data *stream_data = &stream_datas[k]; |
b0a99af4 MD |
171 | |
172 | if (!stream_data->handle) | |
173 | break; | |
174 | /* map stream */ | |
175 | ret = channel_handle_add_stream(handle, | |
176 | stream_data->shm_fd, | |
177 | stream_data->wait_fd, | |
178 | stream_data->memory_map_size); | |
179 | if (ret) { | |
180 | printf("add stream error\n"); | |
181 | goto error_destroy; | |
182 | } | |
183 | stream_data->shm_fd = -1; | |
184 | stream_data->wait_fd = -1; | |
185 | } | |
186 | return handle; | |
187 | ||
188 | error_destroy: | |
189 | channel_destroy(chan, handle, 1); | |
190 | return NULL; | |
191 | } | |
192 | ||
193 | static | |
38fae1d3 | 194 | void unmap_channel(struct lttng_ust_shm_handle *handle) |
b0a99af4 MD |
195 | { |
196 | struct channel *chan; | |
197 | ||
198 | chan = shmp(handle, handle->chan); | |
199 | /* unmap channel */ | |
200 | channel_destroy(chan, handle, 1); | |
201 | } | |
202 | ||
203 | static | |
38fae1d3 | 204 | int consume_stream(struct lttng_ust_shm_handle *handle, int cpu, char *outfile) |
b0a99af4 MD |
205 | { |
206 | struct channel *chan; | |
4cfec15c | 207 | struct lttng_ust_lib_ring_buffer *buf; |
b0a99af4 | 208 | int outfd, ret; |
ef9ff354 MD |
209 | int *shm_fd, *wait_fd; |
210 | uint64_t *memory_map_size; | |
b0a99af4 MD |
211 | |
212 | chan = shmp(handle, handle->chan); | |
213 | ||
214 | /* open stream */ | |
215 | buf = channel_get_ring_buffer(&chan->backend.config, | |
216 | chan, cpu, handle, &shm_fd, &wait_fd, &memory_map_size); | |
217 | if (!buf) | |
218 | return -ENOENT; | |
219 | ret = lib_ring_buffer_open_read(buf, handle, 1); | |
220 | if (ret) { | |
221 | return -1; | |
222 | } | |
223 | ||
224 | /* copy */ | |
72aa0d36 | 225 | outfd = open(outfile, O_WRONLY | O_CREAT | O_LARGEFILE | O_TRUNC, |
b0a99af4 MD |
226 | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); |
227 | if (outfd < 0) { | |
228 | perror("open output"); | |
229 | return -1; | |
230 | } | |
231 | ||
232 | printf("Waiting for buffer data for %s\n", outfile); | |
233 | for (;;) { | |
234 | unsigned long read_size; | |
235 | unsigned long copy_size; | |
236 | char *ptr; | |
237 | ||
238 | ret = lib_ring_buffer_get_next_subbuf(buf, handle); | |
239 | printf("get next ret %d\n", ret); | |
240 | if (ret == -ENODATA) | |
241 | break; | |
242 | if (ret == -EAGAIN) { | |
243 | sleep(1); | |
244 | continue; | |
245 | } | |
246 | if (ret) { | |
247 | printf("Error %d in lib_ring_buffer_get_next_subbuf\n", ret); | |
248 | return -1; | |
249 | } | |
250 | read_size = lib_ring_buffer_get_read_data_size( | |
251 | &chan->backend.config, buf, handle); | |
252 | read_size = PAGE_ALIGN(read_size); | |
253 | ptr = lib_ring_buffer_read_offset_address( | |
254 | &buf->backend, 0, handle); | |
255 | printf("WRITE: copy %lu bytes\n", read_size); | |
256 | copy_size = write(outfd, ptr, read_size); | |
257 | if (copy_size < read_size) { | |
f97e7ae1 | 258 | printf("write issue: copied %lu, expected %lu\n", copy_size, read_size); |
b0a99af4 MD |
259 | } |
260 | lib_ring_buffer_put_next_subbuf(buf, handle); | |
261 | } | |
262 | ||
263 | ret = close(outfd); | |
264 | if (ret) { | |
265 | perror("close"); | |
266 | return -1; | |
267 | } | |
268 | ||
269 | /* close stream */ | |
270 | lib_ring_buffer_release_read(buf, handle, 1); | |
271 | return 0; | |
272 | } | |
273 | ||
274 | static | |
275 | int consume_buffers(const char *outputpath) | |
276 | { | |
277 | int k, ret; | |
278 | mode_t old_umask; | |
279 | char pathname[PATH_MAX]; | |
38fae1d3 | 280 | struct lttng_ust_shm_handle *handle; |
b0a99af4 MD |
281 | |
282 | snprintf(pathname, PATH_MAX - 1, "%s", outputpath); | |
283 | old_umask = umask(0); | |
284 | ret = mkdir(pathname, S_IRWXU | S_IRWXG); | |
285 | if (ret && errno != EEXIST) { | |
286 | perror("mkdir"); | |
287 | umask(old_umask); | |
288 | return -1; | |
289 | } | |
290 | umask(old_umask); | |
291 | ||
292 | /* copy metadata */ | |
293 | handle = map_channel(&metadata_data, | |
294 | &metadata_stream_data, 1); | |
295 | if (!handle) | |
296 | return -1; | |
297 | snprintf(pathname, PATH_MAX - 1, | |
298 | "%s/metadata", outputpath); | |
299 | ret = consume_stream(handle, -1, pathname); | |
300 | if (ret && ret != -ENOENT) { | |
301 | printf("Error in consume_stream\n"); | |
302 | return ret; | |
303 | } | |
304 | unmap_channel(handle); | |
305 | ||
306 | /* copy binary data */ | |
307 | handle = map_channel(&channel_data, | |
308 | stream_data, MAX_NR_STREAMS); | |
309 | if (!handle) | |
310 | return -1; | |
311 | for (k = 0; k < MAX_NR_STREAMS; k++) { | |
312 | snprintf(pathname, PATH_MAX - 1, | |
313 | "%s/data_%u", outputpath, k); | |
314 | ret = consume_stream(handle, k, pathname); | |
315 | if (ret && ret != -ENOENT) { | |
316 | printf("Error in consume_stream\n"); | |
317 | return ret; | |
318 | } | |
319 | } | |
320 | unmap_channel(handle); | |
321 | ||
322 | return 0; | |
323 | } | |
324 | ||
57773204 | 325 | static |
b0a99af4 MD |
326 | int send_app_msgs(int sock, const char *outputpath, |
327 | unsigned int nr_events, const char **event_names) | |
328 | { | |
57773204 MD |
329 | struct ustcomm_ust_msg lum; |
330 | struct ustcomm_ust_reply lur; | |
b0a99af4 MD |
331 | int ret, k; |
332 | ||
333 | /* Create session */ | |
334 | memset(&lum, 0, sizeof(lum)); | |
335 | lum.handle = LTTNG_UST_ROOT_HANDLE; | |
336 | lum.cmd = LTTNG_UST_SESSION; | |
57773204 | 337 | ret = ustcomm_send_app_cmd(sock, &lum, &lur); |
b0a99af4 MD |
338 | if (ret) |
339 | return ret; | |
340 | session_handle = lur.ret_val; | |
341 | printf("received session handle %u\n", session_handle); | |
342 | ||
343 | /* Create metadata channel */ | |
344 | memset(&lum, 0, sizeof(lum)); | |
345 | lum.handle = session_handle; | |
346 | lum.cmd = LTTNG_UST_METADATA; | |
347 | lum.u.channel.overwrite = 0; | |
348 | lum.u.channel.subbuf_size = 32768; | |
349 | lum.u.channel.num_subbuf = 4; | |
350 | lum.u.channel.switch_timer_interval = 0; | |
351 | lum.u.channel.read_timer_interval = 0; | |
352 | lum.u.channel.output = LTTNG_UST_MMAP; | |
57773204 | 353 | ret = ustcomm_send_app_cmd(sock, &lum, &lur); |
b0a99af4 MD |
354 | if (ret) |
355 | return ret; | |
356 | metadata_data.handle = lur.ret_val; | |
357 | printf("received metadata handle %u\n", metadata_data.handle); | |
57773204 | 358 | if (lur.ret_code == USTCOMM_OK) { |
b0a99af4 MD |
359 | ssize_t len; |
360 | ||
361 | metadata_data.memory_map_size = lur.u.channel.memory_map_size; | |
362 | /* get shm fd */ | |
57773204 | 363 | len = ustcomm_recv_fd(sock); |
b0a99af4 MD |
364 | if (len < 0) |
365 | return -EINVAL; | |
366 | metadata_data.shm_fd = len; | |
367 | /* get wait fd */ | |
57773204 | 368 | len = ustcomm_recv_fd(sock); |
b0a99af4 MD |
369 | if (len < 0) |
370 | return -EINVAL; | |
371 | metadata_data.wait_fd = len; | |
372 | } | |
373 | ||
374 | ret = open_streams(sock, metadata_data.handle, | |
375 | &metadata_stream_data, 1); | |
376 | if (ret) { | |
377 | printf("Error in open_streams\n"); | |
378 | return ret; | |
379 | } | |
380 | ||
381 | /* Create data channel */ | |
382 | memset(&lum, 0, sizeof(lum)); | |
383 | lum.handle = session_handle; | |
384 | lum.cmd = LTTNG_UST_CHANNEL; | |
385 | //lum.u.channel.overwrite = 0; | |
386 | lum.u.channel.overwrite = 1; | |
387 | lum.u.channel.subbuf_size = 32768; | |
388 | lum.u.channel.num_subbuf = 8; | |
389 | //lum.u.channel.num_subbuf = 4; | |
390 | //lum.u.channel.num_subbuf = 2; | |
391 | lum.u.channel.switch_timer_interval = 0; | |
392 | lum.u.channel.read_timer_interval = 0; | |
393 | lum.u.channel.output = LTTNG_UST_MMAP; | |
57773204 | 394 | ret = ustcomm_send_app_cmd(sock, &lum, &lur); |
b0a99af4 MD |
395 | if (ret) |
396 | return ret; | |
397 | channel_data.handle = lur.ret_val; | |
398 | printf("received channel handle %u\n", channel_data.handle); | |
57773204 | 399 | if (lur.ret_code == USTCOMM_OK) { |
b0a99af4 MD |
400 | ssize_t len; |
401 | ||
402 | channel_data.memory_map_size = lur.u.channel.memory_map_size; | |
403 | /* get shm fd */ | |
57773204 | 404 | len = ustcomm_recv_fd(sock); |
b0a99af4 MD |
405 | if (len < 0) |
406 | return -EINVAL; | |
407 | channel_data.shm_fd = len; | |
408 | /* get wait fd */ | |
57773204 | 409 | len = ustcomm_recv_fd(sock); |
b0a99af4 MD |
410 | if (len < 0) |
411 | return -EINVAL; | |
412 | channel_data.wait_fd = len; | |
413 | } | |
414 | ||
415 | /* Create events */ | |
416 | for (k = 0; k < nr_events; k++) { | |
417 | memset(&lum, 0, sizeof(lum)); | |
418 | lum.handle = channel_data.handle; | |
419 | lum.cmd = LTTNG_UST_EVENT; | |
420 | strncpy(lum.u.event.name, event_names[k], | |
421 | LTTNG_UST_SYM_NAME_LEN); | |
422 | lum.u.event.instrumentation = LTTNG_UST_TRACEPOINT; | |
57773204 | 423 | ret = ustcomm_send_app_cmd(sock, &lum, &lur); |
b0a99af4 MD |
424 | if (ret) |
425 | return ret; | |
426 | event_handle[k] = lur.ret_val; | |
427 | printf("received event handle %u\n", event_handle[k]); | |
428 | } | |
429 | ||
3b402b40 | 430 | /* Attach vtid context */ |
8de38cf7 MD |
431 | memset(&lum, 0, sizeof(lum)); |
432 | lum.handle = channel_data.handle; | |
433 | lum.cmd = LTTNG_UST_CONTEXT; | |
3b402b40 MD |
434 | lum.u.context.ctx = LTTNG_UST_CONTEXT_VTID; |
435 | //lum.u.context.ctx = LTTNG_UST_CONTEXT_PTHREAD_ID; | |
4847e9bb MD |
436 | //lum.u.context.ctx = LTTNG_UST_CONTEXT_VPID; |
437 | //lum.u.context.ctx = LTTNG_UST_CONTEXT_PROCNAME; | |
57773204 | 438 | ret = ustcomm_send_app_cmd(sock, &lum, &lur); |
8de38cf7 MD |
439 | if (ret) |
440 | return ret; | |
441 | context_handle = lur.ret_val; | |
442 | printf("received context handle %u\n", context_handle); | |
443 | ||
b0a99af4 MD |
444 | /* Get references to channel streams */ |
445 | ret = open_streams(sock, channel_data.handle, | |
446 | stream_data, MAX_NR_STREAMS); | |
447 | if (ret) { | |
448 | printf("Error in open_streams\n"); | |
449 | return ret; | |
450 | } | |
451 | ||
452 | memset(&lum, 0, sizeof(lum)); | |
453 | lum.handle = session_handle; | |
454 | lum.cmd = LTTNG_UST_SESSION_START; | |
57773204 | 455 | ret = ustcomm_send_app_cmd(sock, &lum, &lur); |
b0a99af4 MD |
456 | if (ret) |
457 | return ret; | |
458 | printf("Session handle %u started.\n", session_handle); | |
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); |
b0a99af4 MD |
465 | if (ret) |
466 | return ret; | |
467 | printf("Registration done acknowledged.\n"); | |
468 | ||
469 | sleep(4); | |
470 | ||
471 | ret = consume_buffers(outputpath); | |
472 | if (ret) { | |
473 | printf("Error in consume_buffers\n"); | |
474 | return ret; | |
475 | } | |
476 | ||
477 | /* Release data channel */ | |
478 | /* Release streams */ | |
479 | ret = close_streams(sock, stream_data, | |
480 | MAX_NR_STREAMS); | |
481 | if (ret) | |
482 | return ret; | |
483 | ||
8de38cf7 MD |
484 | /* Release context */ |
485 | memset(&lum, 0, sizeof(lum)); | |
486 | lum.handle = context_handle; | |
487 | lum.cmd = LTTNG_UST_RELEASE; | |
57773204 | 488 | ret = ustcomm_send_app_cmd(sock, &lum, &lur); |
8de38cf7 MD |
489 | if (ret) |
490 | return ret; | |
491 | ||
b0a99af4 MD |
492 | /* Release events */ |
493 | for (k = 0; k < nr_events; k++) { | |
494 | memset(&lum, 0, sizeof(lum)); | |
495 | lum.handle = event_handle[k]; | |
496 | lum.cmd = LTTNG_UST_RELEASE; | |
57773204 | 497 | ret = ustcomm_send_app_cmd(sock, &lum, &lur); |
b0a99af4 MD |
498 | if (ret) |
499 | return ret; | |
500 | } | |
501 | memset(&lum, 0, sizeof(lum)); | |
502 | lum.handle = channel_data.handle; | |
503 | lum.cmd = LTTNG_UST_RELEASE; | |
57773204 | 504 | ret = ustcomm_send_app_cmd(sock, &lum, &lur); |
b0a99af4 MD |
505 | if (ret) |
506 | return ret; | |
507 | if (channel_data.shm_fd >= 0) { | |
508 | ret = close(channel_data.shm_fd); | |
509 | if (ret) | |
510 | return ret; | |
511 | } | |
512 | if (channel_data.wait_fd >= 0) { | |
513 | ret = close(channel_data.wait_fd); | |
514 | if (ret) | |
515 | return ret; | |
516 | } | |
517 | ||
518 | /* Release metadata channel */ | |
519 | ret = close_streams(sock, &metadata_stream_data, 1); | |
520 | if (ret) | |
521 | return ret; | |
522 | ||
523 | memset(&lum, 0, sizeof(lum)); | |
524 | lum.handle = metadata_data.handle; | |
525 | lum.cmd = LTTNG_UST_RELEASE; | |
57773204 | 526 | ret = ustcomm_send_app_cmd(sock, &lum, &lur); |
b0a99af4 MD |
527 | if (ret) |
528 | return ret; | |
529 | if (metadata_data.shm_fd >= 0) { | |
530 | ret = close(metadata_data.shm_fd); | |
531 | if (ret) | |
532 | return ret; | |
533 | } | |
534 | if (metadata_data.wait_fd >= 0) { | |
535 | ret = close(metadata_data.wait_fd); | |
536 | if (ret) | |
537 | return ret; | |
538 | } | |
539 | ||
540 | /* Release session */ | |
541 | memset(&lum, 0, sizeof(lum)); | |
542 | lum.handle = session_handle; | |
543 | lum.cmd = LTTNG_UST_RELEASE; | |
57773204 | 544 | ret = ustcomm_send_app_cmd(sock, &lum, &lur); |
b0a99af4 MD |
545 | if (ret) |
546 | return ret; | |
547 | ||
548 | return 0; | |
549 | } | |
550 | ||
551 | /* | |
552 | * Using fork to set umask in the child process (not multi-thread safe). We | |
553 | * deal with the shm_open vs ftruncate race (happening when the sessiond owns | |
554 | * the shm and does not let everybody modify it, to ensure safety against | |
555 | * shm_unlink) by simply letting the mmap fail and retrying after a few | |
556 | * seconds. For global shm, everybody has rw access to it until the sessiond | |
557 | * starts. | |
558 | */ | |
559 | static int get_wait_shm(char *shm_path, size_t mmap_size, int global) | |
560 | { | |
561 | int wait_shm_fd, ret; | |
562 | mode_t mode; | |
563 | ||
564 | /* Default permissions */ | |
565 | mode = S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP; | |
566 | ||
567 | /* Change owner of the shm path */ | |
568 | if (global) { | |
569 | ret = chown(shm_path, 0, 0); | |
570 | if (ret < 0) { | |
571 | if (errno != ENOENT) { | |
572 | perror("chown wait shm"); | |
573 | goto error; | |
574 | } | |
575 | } | |
576 | ||
577 | /* | |
578 | * If global session daemon, any application can register so the shm | |
579 | * needs to be set in read-only mode for others. | |
580 | */ | |
581 | mode |= S_IROTH; | |
582 | } else { | |
583 | ret = chown(shm_path, getuid(), getgid()); | |
584 | if (ret < 0) { | |
585 | if (errno != ENOENT) { | |
586 | perror("chown wait shm"); | |
587 | goto error; | |
588 | } | |
589 | } | |
590 | } | |
591 | ||
592 | /* | |
593 | * Set permissions to the shm even if we did not create the shm. | |
594 | */ | |
595 | ret = chmod(shm_path, mode); | |
596 | if (ret < 0) { | |
597 | if (errno != ENOENT) { | |
598 | perror("chmod wait shm"); | |
599 | goto error; | |
600 | } | |
601 | } | |
602 | ||
603 | /* | |
604 | * We're alone in a child process, so we can modify the process-wide | |
605 | * umask. | |
606 | */ | |
607 | umask(~mode); | |
608 | ||
609 | /* | |
610 | * Try creating shm (or get rw access). We don't do an exclusive open, | |
611 | * because we allow other processes to create+ftruncate it concurrently. | |
612 | */ | |
613 | wait_shm_fd = shm_open(shm_path, O_RDWR | O_CREAT, mode); | |
614 | if (wait_shm_fd < 0) { | |
615 | perror("shm_open wait shm"); | |
616 | goto error; | |
617 | } | |
618 | ||
619 | ret = ftruncate(wait_shm_fd, mmap_size); | |
620 | if (ret < 0) { | |
621 | perror("ftruncate wait shm"); | |
622 | exit(EXIT_FAILURE); | |
623 | } | |
624 | ||
625 | ret = fchmod(wait_shm_fd, mode); | |
626 | if (ret < 0) { | |
627 | perror("fchmod"); | |
628 | exit(EXIT_FAILURE); | |
629 | } | |
630 | ||
631 | printf("Got the wait shm fd %d\n", wait_shm_fd); | |
632 | ||
633 | return wait_shm_fd; | |
634 | ||
635 | error: | |
636 | printf("Failing to get the wait shm fd\n"); | |
637 | ||
638 | return -1; | |
639 | } | |
640 | ||
641 | int update_futex(int fd, int active) | |
642 | { | |
643 | size_t mmap_size = sysconf(_SC_PAGE_SIZE); | |
644 | char *wait_shm_mmap; | |
645 | int ret; | |
646 | ||
647 | wait_shm_mmap = mmap(NULL, mmap_size, PROT_READ | PROT_WRITE, | |
648 | MAP_SHARED, fd, 0); | |
649 | if (wait_shm_mmap == MAP_FAILED) { | |
650 | perror("mmap"); | |
651 | goto error; | |
652 | } | |
653 | ||
654 | if (active) { | |
655 | uatomic_set((int32_t *) wait_shm_mmap, 1); | |
656 | futex_async((int32_t *) wait_shm_mmap, FUTEX_WAKE, | |
657 | INT_MAX, NULL, NULL, 0); | |
658 | } else { | |
659 | uatomic_set((int32_t *) wait_shm_mmap, 0); | |
660 | } | |
661 | ret = munmap(wait_shm_mmap, mmap_size); | |
662 | if (ret) { | |
663 | perror("Error unmapping wait shm"); | |
664 | goto error; | |
665 | } | |
666 | return 0; | |
667 | error: | |
668 | return -1; | |
669 | } | |
670 | ||
671 | /* | |
672 | * Set open files limit to unlimited. This daemon can open a large number of | |
673 | * file descriptors in order to consumer multiple kernel traces. | |
674 | */ | |
675 | static void set_ulimit(void) | |
676 | { | |
677 | int ret; | |
678 | struct rlimit lim; | |
679 | ||
680 | /* | |
681 | * If not root, we cannot increase our max open files. But our | |
682 | * scope is then limited to processes from a single user. | |
683 | */ | |
684 | if (getuid() != 0) | |
685 | return; | |
686 | /* The kernel does not allowed an infinite limit for open files */ | |
687 | lim.rlim_cur = 65535; | |
688 | lim.rlim_max = 65535; | |
689 | ||
690 | ret = setrlimit(RLIMIT_NOFILE, &lim); | |
691 | if (ret < 0) { | |
692 | perror("failed to set open files limit"); | |
693 | } | |
694 | } | |
695 | ||
696 | /* | |
697 | * Usage: | |
698 | * ./ust-basic-tracing outputpath event_name1 event_name2 .... | |
699 | */ | |
700 | int main(int argc, const char **argv) | |
701 | { | |
702 | const char *home_dir; | |
703 | int ret, wait_shm_fd; | |
704 | struct sigaction act; | |
fb50c39d | 705 | mode_t old_umask = 0; |
b0a99af4 MD |
706 | const char *outputpath; |
707 | const char **event_names; | |
708 | unsigned int nr_events; | |
709 | ||
710 | if (argc < 2) { | |
711 | printf("Usage:\n"); | |
712 | printf("%s outputpath event_name1 event_name2 ...\n", | |
713 | argv[0]); | |
714 | exit(-1); | |
715 | } | |
716 | outputpath = argv[1]; | |
717 | event_names = &argv[2]; | |
718 | nr_events = argc - 2; | |
719 | ||
720 | set_ulimit(); | |
721 | ||
722 | /* Ignore sigpipe */ | |
723 | memset(&act, 0, sizeof(act)); | |
724 | ret = sigemptyset(&act.sa_mask); | |
725 | if (ret == -1) { | |
726 | perror("sigemptyset"); | |
727 | return -1; | |
728 | } | |
729 | ||
730 | act.sa_handler = SIG_IGN; | |
731 | ret = sigaction(SIGPIPE, &act, NULL); | |
732 | if (ret == -1) { | |
733 | perror("sigaction"); | |
734 | return -1; | |
735 | } | |
736 | ||
737 | /* Handle SIGTERM */ | |
738 | act.sa_handler = handle_signals; | |
739 | ret = sigaction(SIGTERM, &act, NULL); | |
740 | if (ret == -1) { | |
741 | perror("sigaction"); | |
742 | return -1; | |
743 | } | |
744 | /* Handle SIGINT */ | |
745 | ret = sigaction(SIGINT, &act, NULL); | |
746 | if (ret == -1) { | |
747 | perror("sigaction"); | |
748 | return -1; | |
749 | } | |
750 | ||
751 | if (geteuid() == 0) { | |
752 | ret = mkdir(LTTNG_RUNDIR, S_IRWXU | S_IRWXG | S_IROTH | S_IXOTH); | |
753 | if (ret && errno != EEXIST) { | |
754 | perror("mkdir"); | |
755 | return -1; | |
756 | } | |
757 | wait_shm_fd = get_wait_shm(DEFAULT_GLOBAL_APPS_WAIT_SHM_PATH, | |
758 | sysconf(_SC_PAGE_SIZE), 1); | |
759 | if (wait_shm_fd < 0) { | |
760 | perror("global wait shm error"); | |
761 | return -1; | |
762 | } | |
763 | strcpy(apps_sock_path, DEFAULT_GLOBAL_APPS_UNIX_SOCK); | |
764 | old_umask = umask(0); | |
765 | } else { | |
766 | snprintf(local_apps_wait_shm_path, PATH_MAX, | |
767 | DEFAULT_HOME_APPS_WAIT_SHM_PATH, getuid()); | |
768 | wait_shm_fd = get_wait_shm(local_apps_wait_shm_path, | |
769 | sysconf(_SC_PAGE_SIZE), 0); | |
770 | if (wait_shm_fd < 0) { | |
771 | perror("local wait shm error"); | |
772 | return -1; | |
773 | } | |
774 | home_dir = (const char *) getenv("HOME"); | |
775 | if (!home_dir) { | |
776 | perror("getenv error"); | |
777 | return -ENOENT; | |
778 | } | |
779 | snprintf(apps_sock_path, PATH_MAX, | |
780 | DEFAULT_HOME_APPS_UNIX_SOCK, home_dir); | |
781 | } | |
782 | ||
57773204 | 783 | ret = ustcomm_create_unix_sock(apps_sock_path); |
b0a99af4 MD |
784 | if (ret < 0) { |
785 | perror("create error"); | |
786 | return ret; | |
787 | } | |
788 | apps_socket = ret; | |
789 | ||
790 | if (getuid() == 0) { | |
791 | /* File permission MUST be 666 */ | |
792 | ret = chmod(apps_sock_path, | |
793 | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH); | |
794 | if (ret < 0) { | |
795 | printf("Set file permissions failed: %s\n", apps_sock_path); | |
796 | perror("chmod"); | |
797 | goto end; | |
798 | } | |
799 | umask(old_umask); | |
800 | } | |
57773204 | 801 | ret = ustcomm_listen_unix_sock(apps_socket); |
b0a99af4 MD |
802 | if (ret < 0) { |
803 | perror("listen error"); | |
804 | return ret; | |
805 | } | |
806 | ||
807 | /* wake up futexes */ | |
808 | ret = update_futex(wait_shm_fd, 1); | |
809 | if (ret) { | |
810 | fprintf(stderr, "Error wakeup futex\n"); | |
811 | return -1; | |
812 | } | |
813 | ||
814 | for (;;) { | |
815 | int sock; | |
816 | ssize_t len; | |
817 | struct { | |
818 | uint32_t major; | |
819 | uint32_t minor; | |
820 | pid_t pid; | |
821 | pid_t ppid; | |
822 | uid_t uid; | |
823 | gid_t gid; | |
824 | char name[16]; /* Process name */ | |
825 | } reg_msg; | |
826 | char bufname[17]; | |
827 | ||
828 | if (quit_program) | |
829 | break; | |
830 | ||
831 | printf("Accepting application registration\n"); | |
57773204 | 832 | sock = ustcomm_accept_unix_sock(apps_socket); |
b0a99af4 MD |
833 | if (sock < 0) { |
834 | perror("accept error"); | |
835 | goto end; | |
836 | } | |
837 | ||
838 | /* | |
839 | * Basic recv here to handle the very simple data | |
840 | * that the libust send to register (reg_msg). | |
841 | */ | |
57773204 | 842 | len = ustcomm_recv_unix_sock(sock, ®_msg, sizeof(reg_msg)); |
b0a99af4 | 843 | if (len < 0 || len != sizeof(reg_msg)) { |
57773204 | 844 | perror("ustcomm_recv_unix_sock"); |
b0a99af4 MD |
845 | continue; |
846 | } | |
847 | memcpy(bufname, reg_msg.name, 16); | |
848 | bufname[16] = '\0'; | |
849 | printf("Application %s pid %u ppid %u uid %u gid %u has registered (version : %u.%u)\n", | |
850 | bufname, reg_msg.pid, reg_msg.ppid, reg_msg.uid, | |
851 | reg_msg.gid, reg_msg.major, reg_msg.minor); | |
852 | ret = send_app_msgs(sock, outputpath, nr_events, event_names); | |
853 | if (ret) { | |
854 | printf("Error in send_app_msgs.\n"); | |
855 | sleep(1); | |
856 | } | |
857 | close(sock); | |
858 | } | |
859 | ||
860 | end: | |
861 | printf("quitting.\n"); | |
862 | /* Let applications know we are not responding anymore */ | |
863 | ret = update_futex(wait_shm_fd, 0); | |
864 | if (ret) { | |
865 | fprintf(stderr, "Error wakeup futex\n"); | |
866 | return -1; | |
867 | } | |
868 | ||
869 | return 0; | |
870 | } |