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> |
1a34b35b | 43 | #include <lttng/ust-error.h> |
b0a99af4 MD |
44 | #include "../../libringbuffer/backend.h" |
45 | #include "../../libringbuffer/frontend.h" | |
bdcf8d82 | 46 | #include "../../liblttng-ust/compat.h" /* For ENODATA */ |
b0a99af4 MD |
47 | |
48 | #define MAX_NR_STREAMS 64 | |
49 | #define MAX_NR_EVENTS 128 | |
50 | ||
b0a99af4 | 51 | static int session_handle; |
61f02aea MD |
52 | static struct lttng_ust_object_data metadata_stream_data; |
53 | static struct lttng_ust_object_data metadata_data; | |
54 | static struct lttng_ust_object_data channel_data; | |
55 | static struct lttng_ust_object_data stream_data[MAX_NR_STREAMS]; | |
b0a99af4 | 56 | static int event_handle[MAX_NR_EVENTS]; |
8de38cf7 | 57 | static int context_handle; |
b0a99af4 MD |
58 | |
59 | static int apps_socket = -1; | |
60 | static char apps_sock_path[PATH_MAX]; | |
61 | static char local_apps_wait_shm_path[PATH_MAX]; | |
62 | ||
63 | static volatile int quit_program; | |
64 | ||
65 | static void handle_signals(int signo) | |
66 | { | |
67 | quit_program = 1; | |
68 | } | |
69 | ||
b0a99af4 | 70 | static |
61f02aea | 71 | int open_streams(int sock, int channel_handle, struct lttng_ust_object_data *stream_datas, |
b0a99af4 MD |
72 | int nr_check) |
73 | { | |
74 | int ret, k = 0; | |
75 | ||
76 | for (;;) { | |
57773204 MD |
77 | struct ustcomm_ust_msg lum; |
78 | struct ustcomm_ust_reply lur; | |
b0a99af4 MD |
79 | |
80 | memset(&lum, 0, sizeof(lum)); | |
81 | lum.handle = channel_handle; | |
82 | lum.cmd = LTTNG_UST_STREAM; | |
57773204 | 83 | ret = ustcomm_send_app_cmd(sock, &lum, &lur); |
b0a99af4 MD |
84 | if (!ret) { |
85 | assert(k < nr_check); | |
86 | stream_datas[k].handle = lur.ret_val; | |
87 | printf("received stream handle %u\n", | |
88 | stream_datas[k].handle); | |
7bc53e94 | 89 | if (lur.ret_code == LTTNG_UST_OK) { |
b0a99af4 MD |
90 | ssize_t len; |
91 | ||
92 | stream_datas[k].memory_map_size = lur.u.stream.memory_map_size; | |
93 | /* get shm fd */ | |
57773204 | 94 | len = ustcomm_recv_fd(sock); |
b0a99af4 MD |
95 | if (len < 0) |
96 | return -EINVAL; | |
97 | stream_datas[k].shm_fd = len; | |
98 | /* get wait fd */ | |
57773204 | 99 | len = ustcomm_recv_fd(sock); |
b0a99af4 MD |
100 | if (len < 0) |
101 | return -EINVAL; | |
102 | stream_datas[k].wait_fd = len; | |
103 | } | |
104 | k++; | |
105 | } | |
1a34b35b | 106 | if (ret == -LTTNG_UST_ERR_NOENT) |
b0a99af4 MD |
107 | break; |
108 | if (ret) | |
109 | return ret; | |
110 | } | |
111 | return 0; | |
112 | } | |
113 | ||
114 | static | |
61f02aea | 115 | int close_streams(int sock, struct lttng_ust_object_data *stream_datas, int nr_check) |
b0a99af4 MD |
116 | { |
117 | int ret, k; | |
118 | ||
119 | for (k = 0; k < nr_check; k++) { | |
57773204 MD |
120 | struct ustcomm_ust_msg lum; |
121 | struct ustcomm_ust_reply lur; | |
b0a99af4 MD |
122 | |
123 | if (!stream_datas[k].handle) | |
124 | continue; | |
125 | memset(&lum, 0, sizeof(lum)); | |
126 | lum.handle = stream_datas[k].handle; | |
127 | lum.cmd = LTTNG_UST_RELEASE; | |
57773204 | 128 | ret = ustcomm_send_app_cmd(sock, &lum, &lur); |
b0a99af4 MD |
129 | if (ret) { |
130 | printf("Error closing stream\n"); | |
131 | return ret; | |
132 | } | |
133 | if (stream_datas[k].shm_fd >= 0) { | |
134 | ret = close(stream_datas[k].shm_fd); | |
135 | if (ret) { | |
136 | printf("Error closing stream shm_fd\n"); | |
137 | return ret; | |
138 | } | |
139 | } | |
140 | if (stream_datas[k].wait_fd >= 0) { | |
141 | ret = close(stream_datas[k].wait_fd); | |
142 | if (ret) { | |
143 | printf("Error closing stream wait_fd\n"); | |
144 | return ret; | |
145 | } | |
146 | } | |
147 | } | |
148 | return 0; | |
149 | } | |
150 | ||
151 | static | |
38fae1d3 | 152 | struct lttng_ust_shm_handle *map_channel(struct lttng_ust_object_data *chan_data, |
61f02aea | 153 | struct lttng_ust_object_data *stream_datas, int nr_check) |
b0a99af4 | 154 | { |
38fae1d3 | 155 | struct lttng_ust_shm_handle *handle; |
b0a99af4 MD |
156 | struct channel *chan; |
157 | int k, ret; | |
158 | ||
159 | /* map metadata channel */ | |
160 | handle = channel_handle_create(chan_data->shm_fd, | |
161 | chan_data->wait_fd, | |
162 | chan_data->memory_map_size); | |
163 | if (!handle) { | |
164 | printf("create handle error\n"); | |
165 | return NULL; | |
166 | } | |
167 | chan_data->shm_fd = -1; | |
168 | chan_data->wait_fd = -1; | |
169 | chan = shmp(handle, handle->chan); | |
170 | ||
171 | for (k = 0; k < nr_check; k++) { | |
61f02aea | 172 | struct lttng_ust_object_data *stream_data = &stream_datas[k]; |
b0a99af4 MD |
173 | |
174 | if (!stream_data->handle) | |
175 | break; | |
176 | /* map stream */ | |
177 | ret = channel_handle_add_stream(handle, | |
178 | stream_data->shm_fd, | |
179 | stream_data->wait_fd, | |
180 | stream_data->memory_map_size); | |
181 | if (ret) { | |
182 | printf("add stream error\n"); | |
183 | goto error_destroy; | |
184 | } | |
185 | stream_data->shm_fd = -1; | |
186 | stream_data->wait_fd = -1; | |
187 | } | |
188 | return handle; | |
189 | ||
190 | error_destroy: | |
191 | channel_destroy(chan, handle, 1); | |
192 | return NULL; | |
193 | } | |
194 | ||
195 | static | |
38fae1d3 | 196 | void unmap_channel(struct lttng_ust_shm_handle *handle) |
b0a99af4 MD |
197 | { |
198 | struct channel *chan; | |
199 | ||
200 | chan = shmp(handle, handle->chan); | |
201 | /* unmap channel */ | |
202 | channel_destroy(chan, handle, 1); | |
203 | } | |
204 | ||
205 | static | |
38fae1d3 | 206 | int consume_stream(struct lttng_ust_shm_handle *handle, int cpu, char *outfile) |
b0a99af4 MD |
207 | { |
208 | struct channel *chan; | |
4cfec15c | 209 | struct lttng_ust_lib_ring_buffer *buf; |
b0a99af4 | 210 | int outfd, ret; |
ef9ff354 MD |
211 | int *shm_fd, *wait_fd; |
212 | uint64_t *memory_map_size; | |
b0a99af4 MD |
213 | |
214 | chan = shmp(handle, handle->chan); | |
215 | ||
216 | /* open stream */ | |
217 | buf = channel_get_ring_buffer(&chan->backend.config, | |
218 | chan, cpu, handle, &shm_fd, &wait_fd, &memory_map_size); | |
219 | if (!buf) | |
220 | return -ENOENT; | |
221 | ret = lib_ring_buffer_open_read(buf, handle, 1); | |
222 | if (ret) { | |
223 | return -1; | |
224 | } | |
225 | ||
226 | /* copy */ | |
5cd19802 | 227 | outfd = open(outfile, O_WRONLY | O_CREAT | O_TRUNC, |
b0a99af4 MD |
228 | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); |
229 | if (outfd < 0) { | |
230 | perror("open output"); | |
231 | return -1; | |
232 | } | |
233 | ||
234 | printf("Waiting for buffer data for %s\n", outfile); | |
235 | for (;;) { | |
236 | unsigned long read_size; | |
237 | unsigned long copy_size; | |
238 | char *ptr; | |
239 | ||
240 | ret = lib_ring_buffer_get_next_subbuf(buf, handle); | |
241 | printf("get next ret %d\n", ret); | |
242 | if (ret == -ENODATA) | |
243 | break; | |
244 | if (ret == -EAGAIN) { | |
245 | sleep(1); | |
246 | continue; | |
247 | } | |
248 | if (ret) { | |
249 | printf("Error %d in lib_ring_buffer_get_next_subbuf\n", ret); | |
250 | return -1; | |
251 | } | |
252 | read_size = lib_ring_buffer_get_read_data_size( | |
253 | &chan->backend.config, buf, handle); | |
254 | read_size = PAGE_ALIGN(read_size); | |
255 | ptr = lib_ring_buffer_read_offset_address( | |
256 | &buf->backend, 0, handle); | |
257 | printf("WRITE: copy %lu bytes\n", read_size); | |
258 | copy_size = write(outfd, ptr, read_size); | |
259 | if (copy_size < read_size) { | |
f97e7ae1 | 260 | printf("write issue: copied %lu, expected %lu\n", copy_size, read_size); |
b0a99af4 MD |
261 | } |
262 | lib_ring_buffer_put_next_subbuf(buf, handle); | |
263 | } | |
264 | ||
265 | ret = close(outfd); | |
266 | if (ret) { | |
267 | perror("close"); | |
268 | return -1; | |
269 | } | |
270 | ||
271 | /* close stream */ | |
272 | lib_ring_buffer_release_read(buf, handle, 1); | |
273 | return 0; | |
274 | } | |
275 | ||
276 | static | |
277 | int consume_buffers(const char *outputpath) | |
278 | { | |
279 | int k, ret; | |
280 | mode_t old_umask; | |
281 | char pathname[PATH_MAX]; | |
38fae1d3 | 282 | struct lttng_ust_shm_handle *handle; |
b0a99af4 MD |
283 | |
284 | snprintf(pathname, PATH_MAX - 1, "%s", outputpath); | |
285 | old_umask = umask(0); | |
286 | ret = mkdir(pathname, S_IRWXU | S_IRWXG); | |
287 | if (ret && errno != EEXIST) { | |
288 | perror("mkdir"); | |
289 | umask(old_umask); | |
290 | return -1; | |
291 | } | |
292 | umask(old_umask); | |
293 | ||
294 | /* copy metadata */ | |
295 | handle = map_channel(&metadata_data, | |
296 | &metadata_stream_data, 1); | |
297 | if (!handle) | |
298 | return -1; | |
299 | snprintf(pathname, PATH_MAX - 1, | |
300 | "%s/metadata", outputpath); | |
301 | ret = consume_stream(handle, -1, pathname); | |
302 | if (ret && ret != -ENOENT) { | |
303 | printf("Error in consume_stream\n"); | |
304 | return ret; | |
305 | } | |
306 | unmap_channel(handle); | |
307 | ||
308 | /* copy binary data */ | |
309 | handle = map_channel(&channel_data, | |
310 | stream_data, MAX_NR_STREAMS); | |
311 | if (!handle) | |
312 | return -1; | |
313 | for (k = 0; k < MAX_NR_STREAMS; k++) { | |
314 | snprintf(pathname, PATH_MAX - 1, | |
315 | "%s/data_%u", outputpath, k); | |
316 | ret = consume_stream(handle, k, pathname); | |
317 | if (ret && ret != -ENOENT) { | |
318 | printf("Error in consume_stream\n"); | |
319 | return ret; | |
320 | } | |
321 | } | |
322 | unmap_channel(handle); | |
323 | ||
324 | return 0; | |
325 | } | |
326 | ||
57773204 | 327 | static |
b0a99af4 MD |
328 | int send_app_msgs(int sock, const char *outputpath, |
329 | unsigned int nr_events, const char **event_names) | |
330 | { | |
57773204 MD |
331 | struct ustcomm_ust_msg lum; |
332 | struct ustcomm_ust_reply lur; | |
b0a99af4 MD |
333 | int ret, k; |
334 | ||
335 | /* Create session */ | |
336 | memset(&lum, 0, sizeof(lum)); | |
337 | lum.handle = LTTNG_UST_ROOT_HANDLE; | |
338 | lum.cmd = LTTNG_UST_SESSION; | |
57773204 | 339 | ret = ustcomm_send_app_cmd(sock, &lum, &lur); |
b0a99af4 MD |
340 | if (ret) |
341 | return ret; | |
342 | session_handle = lur.ret_val; | |
343 | printf("received session handle %u\n", session_handle); | |
344 | ||
345 | /* Create metadata channel */ | |
346 | memset(&lum, 0, sizeof(lum)); | |
347 | lum.handle = session_handle; | |
348 | lum.cmd = LTTNG_UST_METADATA; | |
349 | lum.u.channel.overwrite = 0; | |
350 | lum.u.channel.subbuf_size = 32768; | |
351 | lum.u.channel.num_subbuf = 4; | |
352 | lum.u.channel.switch_timer_interval = 0; | |
353 | lum.u.channel.read_timer_interval = 0; | |
354 | lum.u.channel.output = LTTNG_UST_MMAP; | |
57773204 | 355 | ret = ustcomm_send_app_cmd(sock, &lum, &lur); |
b0a99af4 MD |
356 | if (ret) |
357 | return ret; | |
358 | metadata_data.handle = lur.ret_val; | |
359 | printf("received metadata handle %u\n", metadata_data.handle); | |
7bc53e94 | 360 | if (lur.ret_code == LTTNG_UST_OK) { |
b0a99af4 MD |
361 | ssize_t len; |
362 | ||
363 | metadata_data.memory_map_size = lur.u.channel.memory_map_size; | |
364 | /* get shm fd */ | |
57773204 | 365 | len = ustcomm_recv_fd(sock); |
b0a99af4 MD |
366 | if (len < 0) |
367 | return -EINVAL; | |
368 | metadata_data.shm_fd = len; | |
369 | /* get wait fd */ | |
57773204 | 370 | len = ustcomm_recv_fd(sock); |
b0a99af4 MD |
371 | if (len < 0) |
372 | return -EINVAL; | |
373 | metadata_data.wait_fd = len; | |
374 | } | |
375 | ||
376 | ret = open_streams(sock, metadata_data.handle, | |
377 | &metadata_stream_data, 1); | |
378 | if (ret) { | |
379 | printf("Error in open_streams\n"); | |
380 | return ret; | |
381 | } | |
382 | ||
383 | /* Create data channel */ | |
384 | memset(&lum, 0, sizeof(lum)); | |
385 | lum.handle = session_handle; | |
386 | lum.cmd = LTTNG_UST_CHANNEL; | |
387 | //lum.u.channel.overwrite = 0; | |
388 | lum.u.channel.overwrite = 1; | |
389 | lum.u.channel.subbuf_size = 32768; | |
390 | lum.u.channel.num_subbuf = 8; | |
391 | //lum.u.channel.num_subbuf = 4; | |
392 | //lum.u.channel.num_subbuf = 2; | |
393 | lum.u.channel.switch_timer_interval = 0; | |
394 | lum.u.channel.read_timer_interval = 0; | |
395 | lum.u.channel.output = LTTNG_UST_MMAP; | |
57773204 | 396 | ret = ustcomm_send_app_cmd(sock, &lum, &lur); |
b0a99af4 MD |
397 | if (ret) |
398 | return ret; | |
399 | channel_data.handle = lur.ret_val; | |
400 | printf("received channel handle %u\n", channel_data.handle); | |
7bc53e94 | 401 | if (lur.ret_code == LTTNG_UST_OK) { |
b0a99af4 MD |
402 | ssize_t len; |
403 | ||
404 | channel_data.memory_map_size = lur.u.channel.memory_map_size; | |
405 | /* get shm fd */ | |
57773204 | 406 | len = ustcomm_recv_fd(sock); |
b0a99af4 MD |
407 | if (len < 0) |
408 | return -EINVAL; | |
409 | channel_data.shm_fd = len; | |
410 | /* get wait fd */ | |
57773204 | 411 | len = ustcomm_recv_fd(sock); |
b0a99af4 MD |
412 | if (len < 0) |
413 | return -EINVAL; | |
414 | channel_data.wait_fd = len; | |
415 | } | |
416 | ||
417 | /* Create events */ | |
418 | for (k = 0; k < nr_events; k++) { | |
419 | memset(&lum, 0, sizeof(lum)); | |
420 | lum.handle = channel_data.handle; | |
421 | lum.cmd = LTTNG_UST_EVENT; | |
422 | strncpy(lum.u.event.name, event_names[k], | |
423 | LTTNG_UST_SYM_NAME_LEN); | |
424 | lum.u.event.instrumentation = LTTNG_UST_TRACEPOINT; | |
57773204 | 425 | ret = ustcomm_send_app_cmd(sock, &lum, &lur); |
b0a99af4 MD |
426 | if (ret) |
427 | return ret; | |
428 | event_handle[k] = lur.ret_val; | |
429 | printf("received event handle %u\n", event_handle[k]); | |
430 | } | |
431 | ||
3b402b40 | 432 | /* Attach vtid context */ |
8de38cf7 MD |
433 | memset(&lum, 0, sizeof(lum)); |
434 | lum.handle = channel_data.handle; | |
435 | lum.cmd = LTTNG_UST_CONTEXT; | |
3b402b40 MD |
436 | lum.u.context.ctx = LTTNG_UST_CONTEXT_VTID; |
437 | //lum.u.context.ctx = LTTNG_UST_CONTEXT_PTHREAD_ID; | |
4847e9bb MD |
438 | //lum.u.context.ctx = LTTNG_UST_CONTEXT_VPID; |
439 | //lum.u.context.ctx = LTTNG_UST_CONTEXT_PROCNAME; | |
57773204 | 440 | ret = ustcomm_send_app_cmd(sock, &lum, &lur); |
8de38cf7 MD |
441 | if (ret) |
442 | return ret; | |
443 | context_handle = lur.ret_val; | |
444 | printf("received context handle %u\n", context_handle); | |
445 | ||
b0a99af4 MD |
446 | /* Get references to channel streams */ |
447 | ret = open_streams(sock, channel_data.handle, | |
448 | stream_data, MAX_NR_STREAMS); | |
449 | if (ret) { | |
450 | printf("Error in open_streams\n"); | |
451 | return ret; | |
452 | } | |
453 | ||
454 | memset(&lum, 0, sizeof(lum)); | |
455 | lum.handle = session_handle; | |
456 | lum.cmd = LTTNG_UST_SESSION_START; | |
57773204 | 457 | ret = ustcomm_send_app_cmd(sock, &lum, &lur); |
b0a99af4 MD |
458 | if (ret) |
459 | return ret; | |
460 | printf("Session handle %u started.\n", session_handle); | |
461 | ||
462 | /* Tell application registration is done */ | |
463 | memset(&lum, 0, sizeof(lum)); | |
464 | lum.handle = LTTNG_UST_ROOT_HANDLE; | |
465 | lum.cmd = LTTNG_UST_REGISTER_DONE; | |
57773204 | 466 | ret = ustcomm_send_app_cmd(sock, &lum, &lur); |
b0a99af4 MD |
467 | if (ret) |
468 | return ret; | |
469 | printf("Registration done acknowledged.\n"); | |
470 | ||
471 | sleep(4); | |
472 | ||
473 | ret = consume_buffers(outputpath); | |
474 | if (ret) { | |
475 | printf("Error in consume_buffers\n"); | |
476 | return ret; | |
477 | } | |
478 | ||
479 | /* Release data channel */ | |
480 | /* Release streams */ | |
481 | ret = close_streams(sock, stream_data, | |
482 | MAX_NR_STREAMS); | |
483 | if (ret) | |
484 | return ret; | |
485 | ||
8de38cf7 MD |
486 | /* Release context */ |
487 | memset(&lum, 0, sizeof(lum)); | |
488 | lum.handle = context_handle; | |
489 | lum.cmd = LTTNG_UST_RELEASE; | |
57773204 | 490 | ret = ustcomm_send_app_cmd(sock, &lum, &lur); |
8de38cf7 MD |
491 | if (ret) |
492 | return ret; | |
493 | ||
b0a99af4 MD |
494 | /* Release events */ |
495 | for (k = 0; k < nr_events; k++) { | |
496 | memset(&lum, 0, sizeof(lum)); | |
497 | lum.handle = event_handle[k]; | |
498 | lum.cmd = LTTNG_UST_RELEASE; | |
57773204 | 499 | ret = ustcomm_send_app_cmd(sock, &lum, &lur); |
b0a99af4 MD |
500 | if (ret) |
501 | return ret; | |
502 | } | |
503 | memset(&lum, 0, sizeof(lum)); | |
504 | lum.handle = channel_data.handle; | |
505 | lum.cmd = LTTNG_UST_RELEASE; | |
57773204 | 506 | ret = ustcomm_send_app_cmd(sock, &lum, &lur); |
b0a99af4 MD |
507 | if (ret) |
508 | return ret; | |
509 | if (channel_data.shm_fd >= 0) { | |
510 | ret = close(channel_data.shm_fd); | |
511 | if (ret) | |
512 | return ret; | |
513 | } | |
514 | if (channel_data.wait_fd >= 0) { | |
515 | ret = close(channel_data.wait_fd); | |
516 | if (ret) | |
517 | return ret; | |
518 | } | |
519 | ||
520 | /* Release metadata channel */ | |
521 | ret = close_streams(sock, &metadata_stream_data, 1); | |
522 | if (ret) | |
523 | return ret; | |
524 | ||
525 | memset(&lum, 0, sizeof(lum)); | |
526 | lum.handle = metadata_data.handle; | |
527 | lum.cmd = LTTNG_UST_RELEASE; | |
57773204 | 528 | ret = ustcomm_send_app_cmd(sock, &lum, &lur); |
b0a99af4 MD |
529 | if (ret) |
530 | return ret; | |
531 | if (metadata_data.shm_fd >= 0) { | |
532 | ret = close(metadata_data.shm_fd); | |
533 | if (ret) | |
534 | return ret; | |
535 | } | |
536 | if (metadata_data.wait_fd >= 0) { | |
537 | ret = close(metadata_data.wait_fd); | |
538 | if (ret) | |
539 | return ret; | |
540 | } | |
541 | ||
542 | /* Release session */ | |
543 | memset(&lum, 0, sizeof(lum)); | |
544 | lum.handle = session_handle; | |
545 | lum.cmd = LTTNG_UST_RELEASE; | |
57773204 | 546 | ret = ustcomm_send_app_cmd(sock, &lum, &lur); |
b0a99af4 MD |
547 | if (ret) |
548 | return ret; | |
549 | ||
550 | return 0; | |
551 | } | |
552 | ||
553 | /* | |
554 | * Using fork to set umask in the child process (not multi-thread safe). We | |
555 | * deal with the shm_open vs ftruncate race (happening when the sessiond owns | |
556 | * the shm and does not let everybody modify it, to ensure safety against | |
557 | * shm_unlink) by simply letting the mmap fail and retrying after a few | |
558 | * seconds. For global shm, everybody has rw access to it until the sessiond | |
559 | * starts. | |
560 | */ | |
561 | static int get_wait_shm(char *shm_path, size_t mmap_size, int global) | |
562 | { | |
563 | int wait_shm_fd, ret; | |
564 | mode_t mode; | |
565 | ||
566 | /* Default permissions */ | |
567 | mode = S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP; | |
568 | ||
569 | /* Change owner of the shm path */ | |
570 | if (global) { | |
571 | ret = chown(shm_path, 0, 0); | |
572 | if (ret < 0) { | |
573 | if (errno != ENOENT) { | |
574 | perror("chown wait shm"); | |
575 | goto error; | |
576 | } | |
577 | } | |
578 | ||
579 | /* | |
580 | * If global session daemon, any application can register so the shm | |
581 | * needs to be set in read-only mode for others. | |
582 | */ | |
583 | mode |= S_IROTH; | |
584 | } else { | |
585 | ret = chown(shm_path, getuid(), getgid()); | |
586 | if (ret < 0) { | |
587 | if (errno != ENOENT) { | |
588 | perror("chown wait shm"); | |
589 | goto error; | |
590 | } | |
591 | } | |
592 | } | |
593 | ||
594 | /* | |
595 | * Set permissions to the shm even if we did not create the shm. | |
596 | */ | |
597 | ret = chmod(shm_path, mode); | |
598 | if (ret < 0) { | |
599 | if (errno != ENOENT) { | |
600 | perror("chmod wait shm"); | |
601 | goto error; | |
602 | } | |
603 | } | |
604 | ||
605 | /* | |
606 | * We're alone in a child process, so we can modify the process-wide | |
607 | * umask. | |
608 | */ | |
609 | umask(~mode); | |
610 | ||
611 | /* | |
612 | * Try creating shm (or get rw access). We don't do an exclusive open, | |
613 | * because we allow other processes to create+ftruncate it concurrently. | |
614 | */ | |
615 | wait_shm_fd = shm_open(shm_path, O_RDWR | O_CREAT, mode); | |
616 | if (wait_shm_fd < 0) { | |
617 | perror("shm_open wait shm"); | |
618 | goto error; | |
619 | } | |
620 | ||
621 | ret = ftruncate(wait_shm_fd, mmap_size); | |
622 | if (ret < 0) { | |
623 | perror("ftruncate wait shm"); | |
624 | exit(EXIT_FAILURE); | |
625 | } | |
626 | ||
627 | ret = fchmod(wait_shm_fd, mode); | |
628 | if (ret < 0) { | |
629 | perror("fchmod"); | |
630 | exit(EXIT_FAILURE); | |
631 | } | |
632 | ||
633 | printf("Got the wait shm fd %d\n", wait_shm_fd); | |
634 | ||
635 | return wait_shm_fd; | |
636 | ||
637 | error: | |
638 | printf("Failing to get the wait shm fd\n"); | |
639 | ||
640 | return -1; | |
641 | } | |
642 | ||
643 | int update_futex(int fd, int active) | |
644 | { | |
172d6b68 | 645 | long page_size; |
b0a99af4 MD |
646 | char *wait_shm_mmap; |
647 | int ret; | |
648 | ||
172d6b68 | 649 | page_size = sysconf(_SC_PAGE_SIZE); |
2657d1ba MD |
650 | if (page_size <= 0) { |
651 | if (!page_size) { | |
652 | errno = EINVAL; | |
653 | } | |
654 | perror("Error in sysconf(_SC_PAGE_SIZE)"); | |
172d6b68 MD |
655 | goto error; |
656 | } | |
657 | wait_shm_mmap = mmap(NULL, page_size, PROT_READ | PROT_WRITE, | |
b0a99af4 MD |
658 | MAP_SHARED, fd, 0); |
659 | if (wait_shm_mmap == MAP_FAILED) { | |
660 | perror("mmap"); | |
661 | goto error; | |
662 | } | |
663 | ||
664 | if (active) { | |
665 | uatomic_set((int32_t *) wait_shm_mmap, 1); | |
ee7fcec8 MD |
666 | if (futex_async((int32_t *) wait_shm_mmap, FUTEX_WAKE, |
667 | INT_MAX, NULL, NULL, 0) < 0) { | |
668 | perror("futex_async"); | |
669 | goto error; | |
670 | } | |
b0a99af4 MD |
671 | } else { |
672 | uatomic_set((int32_t *) wait_shm_mmap, 0); | |
673 | } | |
172d6b68 | 674 | ret = munmap(wait_shm_mmap, page_size); |
b0a99af4 MD |
675 | if (ret) { |
676 | perror("Error unmapping wait shm"); | |
677 | goto error; | |
678 | } | |
679 | return 0; | |
680 | error: | |
681 | return -1; | |
682 | } | |
683 | ||
684 | /* | |
685 | * Set open files limit to unlimited. This daemon can open a large number of | |
686 | * file descriptors in order to consumer multiple kernel traces. | |
687 | */ | |
688 | static void set_ulimit(void) | |
689 | { | |
690 | int ret; | |
691 | struct rlimit lim; | |
692 | ||
693 | /* | |
694 | * If not root, we cannot increase our max open files. But our | |
695 | * scope is then limited to processes from a single user. | |
696 | */ | |
697 | if (getuid() != 0) | |
698 | return; | |
699 | /* The kernel does not allowed an infinite limit for open files */ | |
700 | lim.rlim_cur = 65535; | |
701 | lim.rlim_max = 65535; | |
702 | ||
703 | ret = setrlimit(RLIMIT_NOFILE, &lim); | |
704 | if (ret < 0) { | |
705 | perror("failed to set open files limit"); | |
706 | } | |
707 | } | |
708 | ||
709 | /* | |
710 | * Usage: | |
711 | * ./ust-basic-tracing outputpath event_name1 event_name2 .... | |
712 | */ | |
713 | int main(int argc, const char **argv) | |
714 | { | |
715 | const char *home_dir; | |
3d39c98c CB |
716 | char home_rundir[PATH_MAX]; |
717 | char *cmd = NULL; | |
b0a99af4 MD |
718 | int ret, wait_shm_fd; |
719 | struct sigaction act; | |
fb50c39d | 720 | mode_t old_umask = 0; |
b0a99af4 MD |
721 | const char *outputpath; |
722 | const char **event_names; | |
723 | unsigned int nr_events; | |
2657d1ba | 724 | long page_size; |
b0a99af4 MD |
725 | |
726 | if (argc < 2) { | |
727 | printf("Usage:\n"); | |
728 | printf("%s outputpath event_name1 event_name2 ...\n", | |
729 | argv[0]); | |
730 | exit(-1); | |
731 | } | |
732 | outputpath = argv[1]; | |
733 | event_names = &argv[2]; | |
734 | nr_events = argc - 2; | |
735 | ||
736 | set_ulimit(); | |
737 | ||
738 | /* Ignore sigpipe */ | |
739 | memset(&act, 0, sizeof(act)); | |
740 | ret = sigemptyset(&act.sa_mask); | |
741 | if (ret == -1) { | |
742 | perror("sigemptyset"); | |
743 | return -1; | |
744 | } | |
745 | ||
746 | act.sa_handler = SIG_IGN; | |
747 | ret = sigaction(SIGPIPE, &act, NULL); | |
748 | if (ret == -1) { | |
749 | perror("sigaction"); | |
750 | return -1; | |
751 | } | |
752 | ||
753 | /* Handle SIGTERM */ | |
754 | act.sa_handler = handle_signals; | |
755 | ret = sigaction(SIGTERM, &act, NULL); | |
756 | if (ret == -1) { | |
757 | perror("sigaction"); | |
758 | return -1; | |
759 | } | |
760 | /* Handle SIGINT */ | |
761 | ret = sigaction(SIGINT, &act, NULL); | |
762 | if (ret == -1) { | |
763 | perror("sigaction"); | |
764 | return -1; | |
765 | } | |
766 | ||
2657d1ba MD |
767 | page_size = sysconf(_SC_PAGE_SIZE); |
768 | if (page_size <= 0) { | |
769 | if (!page_size) { | |
770 | errno = EINVAL; | |
771 | } | |
772 | perror("Error in sysconf(_SC_PAGE_SIZE)"); | |
773 | return -1; | |
774 | } | |
775 | ||
b0a99af4 MD |
776 | if (geteuid() == 0) { |
777 | ret = mkdir(LTTNG_RUNDIR, S_IRWXU | S_IRWXG | S_IROTH | S_IXOTH); | |
778 | if (ret && errno != EEXIST) { | |
779 | perror("mkdir"); | |
780 | return -1; | |
781 | } | |
782 | wait_shm_fd = get_wait_shm(DEFAULT_GLOBAL_APPS_WAIT_SHM_PATH, | |
2657d1ba | 783 | page_size, 1); |
b0a99af4 MD |
784 | if (wait_shm_fd < 0) { |
785 | perror("global wait shm error"); | |
786 | return -1; | |
787 | } | |
788 | strcpy(apps_sock_path, DEFAULT_GLOBAL_APPS_UNIX_SOCK); | |
789 | old_umask = umask(0); | |
790 | } else { | |
3d39c98c CB |
791 | home_dir = (const char *) getenv("HOME"); |
792 | if (!home_dir) { | |
793 | perror("getenv error"); | |
794 | return -ENOENT; | |
795 | } | |
796 | ||
797 | snprintf(home_rundir, PATH_MAX, | |
798 | LTTNG_HOME_RUNDIR, home_dir); | |
799 | ||
800 | ret = mkdir(home_rundir, S_IRWXU | S_IRWXG | S_IROTH | S_IXOTH); | |
801 | if (ret && errno != EEXIST) { | |
802 | perror("mkdir"); | |
803 | return -1; | |
804 | } | |
805 | ||
b0a99af4 MD |
806 | snprintf(local_apps_wait_shm_path, PATH_MAX, |
807 | DEFAULT_HOME_APPS_WAIT_SHM_PATH, getuid()); | |
808 | wait_shm_fd = get_wait_shm(local_apps_wait_shm_path, | |
2657d1ba | 809 | page_size, 0); |
b0a99af4 MD |
810 | if (wait_shm_fd < 0) { |
811 | perror("local wait shm error"); | |
812 | return -1; | |
813 | } | |
b0a99af4 MD |
814 | snprintf(apps_sock_path, PATH_MAX, |
815 | DEFAULT_HOME_APPS_UNIX_SOCK, home_dir); | |
816 | } | |
817 | ||
57773204 | 818 | ret = ustcomm_create_unix_sock(apps_sock_path); |
b0a99af4 MD |
819 | if (ret < 0) { |
820 | perror("create error"); | |
821 | return ret; | |
822 | } | |
823 | apps_socket = ret; | |
824 | ||
825 | if (getuid() == 0) { | |
826 | /* File permission MUST be 666 */ | |
827 | ret = chmod(apps_sock_path, | |
828 | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH); | |
829 | if (ret < 0) { | |
830 | printf("Set file permissions failed: %s\n", apps_sock_path); | |
831 | perror("chmod"); | |
832 | goto end; | |
833 | } | |
834 | umask(old_umask); | |
835 | } | |
57773204 | 836 | ret = ustcomm_listen_unix_sock(apps_socket); |
b0a99af4 MD |
837 | if (ret < 0) { |
838 | perror("listen error"); | |
839 | return ret; | |
840 | } | |
841 | ||
842 | /* wake up futexes */ | |
843 | ret = update_futex(wait_shm_fd, 1); | |
844 | if (ret) { | |
845 | fprintf(stderr, "Error wakeup futex\n"); | |
846 | return -1; | |
847 | } | |
848 | ||
849 | for (;;) { | |
850 | int sock; | |
851 | ssize_t len; | |
852 | struct { | |
853 | uint32_t major; | |
854 | uint32_t minor; | |
855 | pid_t pid; | |
856 | pid_t ppid; | |
857 | uid_t uid; | |
858 | gid_t gid; | |
1a34b35b | 859 | uint32_t bits_per_long; |
b0a99af4 MD |
860 | char name[16]; /* Process name */ |
861 | } reg_msg; | |
862 | char bufname[17]; | |
863 | ||
864 | if (quit_program) | |
865 | break; | |
866 | ||
867 | printf("Accepting application registration\n"); | |
57773204 | 868 | sock = ustcomm_accept_unix_sock(apps_socket); |
b0a99af4 MD |
869 | if (sock < 0) { |
870 | perror("accept error"); | |
871 | goto end; | |
872 | } | |
873 | ||
874 | /* | |
875 | * Basic recv here to handle the very simple data | |
876 | * that the libust send to register (reg_msg). | |
877 | */ | |
57773204 | 878 | len = ustcomm_recv_unix_sock(sock, ®_msg, sizeof(reg_msg)); |
b0a99af4 | 879 | if (len < 0 || len != sizeof(reg_msg)) { |
57773204 | 880 | perror("ustcomm_recv_unix_sock"); |
b0a99af4 MD |
881 | continue; |
882 | } | |
883 | memcpy(bufname, reg_msg.name, 16); | |
884 | bufname[16] = '\0'; | |
885 | printf("Application %s pid %u ppid %u uid %u gid %u has registered (version : %u.%u)\n", | |
886 | bufname, reg_msg.pid, reg_msg.ppid, reg_msg.uid, | |
887 | reg_msg.gid, reg_msg.major, reg_msg.minor); | |
888 | ret = send_app_msgs(sock, outputpath, nr_events, event_names); | |
889 | if (ret) { | |
890 | printf("Error in send_app_msgs.\n"); | |
891 | sleep(1); | |
892 | } | |
893 | close(sock); | |
894 | } | |
895 | ||
896 | end: | |
897 | printf("quitting.\n"); | |
898 | /* Let applications know we are not responding anymore */ | |
899 | ret = update_futex(wait_shm_fd, 0); | |
900 | if (ret) { | |
901 | fprintf(stderr, "Error wakeup futex\n"); | |
902 | return -1; | |
903 | } | |
904 | ||
3d39c98c CB |
905 | if (geteuid()) { |
906 | printf("Removing %s directory\n", home_rundir); | |
907 | ret = asprintf(&cmd, "rm -rf %s", home_rundir); | |
908 | if (ret < 0) { | |
909 | printf("asprintf failed. Something is really wrong!\n"); | |
910 | return -1; | |
911 | } | |
912 | ||
913 | /* Remove lttng run directory */ | |
914 | ret = system(cmd); | |
915 | if (ret < 0) { | |
916 | printf("Unable to clean %s\n", home_rundir); | |
917 | return -1; | |
918 | } | |
919 | } | |
920 | ||
921 | ||
b0a99af4 MD |
922 | return 0; |
923 | } |