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 |
fb31eb73 | 23 | #include <assert.h> |
b0a99af4 | 24 | #include <errno.h> |
fb31eb73 FD |
25 | #include <fcntl.h> |
26 | #include <limits.h> | |
27 | #include <signal.h> | |
28 | #include <stdint.h> | |
b0a99af4 MD |
29 | #include <stdio.h> |
30 | #include <stdlib.h> | |
31 | #include <string.h> | |
fb31eb73 FD |
32 | #include <sys/mman.h> |
33 | #include <sys/resource.h> | |
34 | #include <sys/socket.h> | |
b0a99af4 | 35 | #include <sys/stat.h> |
07dd0d60 | 36 | #include <sys/time.h> |
fb31eb73 FD |
37 | #include <sys/types.h> |
38 | #include <sys/wait.h> | |
39 | #include <unistd.h> | |
b0a99af4 MD |
40 | #include <urcu/futex.h> |
41 | #include <urcu/uatomic.h> | |
b0a99af4 | 42 | |
a3bb4b27 | 43 | #include <ust-comm.h> |
1a34b35b | 44 | #include <lttng/ust-error.h> |
b0a99af4 MD |
45 | #include "../../libringbuffer/backend.h" |
46 | #include "../../libringbuffer/frontend.h" | |
bdcf8d82 | 47 | #include "../../liblttng-ust/compat.h" /* For ENODATA */ |
b0a99af4 MD |
48 | |
49 | #define MAX_NR_STREAMS 64 | |
50 | #define MAX_NR_EVENTS 128 | |
51 | ||
b0a99af4 | 52 | static int session_handle; |
61f02aea MD |
53 | static struct lttng_ust_object_data metadata_stream_data; |
54 | static struct lttng_ust_object_data metadata_data; | |
55 | static struct lttng_ust_object_data channel_data; | |
56 | static struct lttng_ust_object_data stream_data[MAX_NR_STREAMS]; | |
b0a99af4 | 57 | static int event_handle[MAX_NR_EVENTS]; |
8de38cf7 | 58 | static int context_handle; |
b0a99af4 MD |
59 | |
60 | static int apps_socket = -1; | |
61 | static char apps_sock_path[PATH_MAX]; | |
62 | static char local_apps_wait_shm_path[PATH_MAX]; | |
63 | ||
64 | static volatile int quit_program; | |
65 | ||
66 | static void handle_signals(int signo) | |
67 | { | |
68 | quit_program = 1; | |
69 | } | |
70 | ||
b0a99af4 | 71 | static |
61f02aea | 72 | int open_streams(int sock, int channel_handle, struct lttng_ust_object_data *stream_datas, |
b0a99af4 MD |
73 | int nr_check) |
74 | { | |
75 | int ret, k = 0; | |
76 | ||
77 | for (;;) { | |
57773204 MD |
78 | struct ustcomm_ust_msg lum; |
79 | struct ustcomm_ust_reply lur; | |
b0a99af4 MD |
80 | |
81 | memset(&lum, 0, sizeof(lum)); | |
82 | lum.handle = channel_handle; | |
83 | lum.cmd = LTTNG_UST_STREAM; | |
57773204 | 84 | ret = ustcomm_send_app_cmd(sock, &lum, &lur); |
b0a99af4 MD |
85 | if (!ret) { |
86 | assert(k < nr_check); | |
87 | stream_datas[k].handle = lur.ret_val; | |
88 | printf("received stream handle %u\n", | |
89 | stream_datas[k].handle); | |
7bc53e94 | 90 | if (lur.ret_code == LTTNG_UST_OK) { |
b0a99af4 MD |
91 | ssize_t len; |
92 | ||
93 | stream_datas[k].memory_map_size = lur.u.stream.memory_map_size; | |
94 | /* get shm fd */ | |
57773204 | 95 | len = ustcomm_recv_fd(sock); |
b0a99af4 MD |
96 | if (len < 0) |
97 | return -EINVAL; | |
98 | stream_datas[k].shm_fd = len; | |
99 | /* get wait fd */ | |
57773204 | 100 | len = ustcomm_recv_fd(sock); |
b0a99af4 MD |
101 | if (len < 0) |
102 | return -EINVAL; | |
103 | stream_datas[k].wait_fd = len; | |
104 | } | |
105 | k++; | |
106 | } | |
1a34b35b | 107 | if (ret == -LTTNG_UST_ERR_NOENT) |
b0a99af4 MD |
108 | break; |
109 | if (ret) | |
110 | return ret; | |
111 | } | |
112 | return 0; | |
113 | } | |
114 | ||
115 | static | |
61f02aea | 116 | int close_streams(int sock, struct lttng_ust_object_data *stream_datas, int nr_check) |
b0a99af4 MD |
117 | { |
118 | int ret, k; | |
119 | ||
120 | for (k = 0; k < nr_check; k++) { | |
57773204 MD |
121 | struct ustcomm_ust_msg lum; |
122 | struct ustcomm_ust_reply lur; | |
b0a99af4 MD |
123 | |
124 | if (!stream_datas[k].handle) | |
125 | continue; | |
126 | memset(&lum, 0, sizeof(lum)); | |
127 | lum.handle = stream_datas[k].handle; | |
128 | lum.cmd = LTTNG_UST_RELEASE; | |
57773204 | 129 | ret = ustcomm_send_app_cmd(sock, &lum, &lur); |
b0a99af4 MD |
130 | if (ret) { |
131 | printf("Error closing stream\n"); | |
132 | return ret; | |
133 | } | |
134 | if (stream_datas[k].shm_fd >= 0) { | |
135 | ret = close(stream_datas[k].shm_fd); | |
136 | if (ret) { | |
137 | printf("Error closing stream shm_fd\n"); | |
138 | return ret; | |
139 | } | |
140 | } | |
141 | if (stream_datas[k].wait_fd >= 0) { | |
142 | ret = close(stream_datas[k].wait_fd); | |
143 | if (ret) { | |
144 | printf("Error closing stream wait_fd\n"); | |
145 | return ret; | |
146 | } | |
147 | } | |
148 | } | |
149 | return 0; | |
150 | } | |
151 | ||
152 | static | |
38fae1d3 | 153 | struct lttng_ust_shm_handle *map_channel(struct lttng_ust_object_data *chan_data, |
61f02aea | 154 | struct lttng_ust_object_data *stream_datas, int nr_check) |
b0a99af4 | 155 | { |
38fae1d3 | 156 | struct lttng_ust_shm_handle *handle; |
b0a99af4 MD |
157 | struct channel *chan; |
158 | int k, ret; | |
159 | ||
160 | /* map metadata channel */ | |
161 | handle = channel_handle_create(chan_data->shm_fd, | |
162 | chan_data->wait_fd, | |
163 | chan_data->memory_map_size); | |
164 | if (!handle) { | |
165 | printf("create handle error\n"); | |
166 | return NULL; | |
167 | } | |
168 | chan_data->shm_fd = -1; | |
169 | chan_data->wait_fd = -1; | |
170 | chan = shmp(handle, handle->chan); | |
171 | ||
172 | for (k = 0; k < nr_check; k++) { | |
61f02aea | 173 | struct lttng_ust_object_data *stream_data = &stream_datas[k]; |
b0a99af4 MD |
174 | |
175 | if (!stream_data->handle) | |
176 | break; | |
177 | /* map stream */ | |
178 | ret = channel_handle_add_stream(handle, | |
179 | stream_data->shm_fd, | |
180 | stream_data->wait_fd, | |
181 | stream_data->memory_map_size); | |
182 | if (ret) { | |
183 | printf("add stream error\n"); | |
184 | goto error_destroy; | |
185 | } | |
186 | stream_data->shm_fd = -1; | |
187 | stream_data->wait_fd = -1; | |
188 | } | |
189 | return handle; | |
190 | ||
191 | error_destroy: | |
192 | channel_destroy(chan, handle, 1); | |
193 | return NULL; | |
194 | } | |
195 | ||
196 | static | |
38fae1d3 | 197 | void unmap_channel(struct lttng_ust_shm_handle *handle) |
b0a99af4 MD |
198 | { |
199 | struct channel *chan; | |
200 | ||
201 | chan = shmp(handle, handle->chan); | |
202 | /* unmap channel */ | |
203 | channel_destroy(chan, handle, 1); | |
204 | } | |
205 | ||
206 | static | |
38fae1d3 | 207 | int consume_stream(struct lttng_ust_shm_handle *handle, int cpu, char *outfile) |
b0a99af4 MD |
208 | { |
209 | struct channel *chan; | |
4cfec15c | 210 | struct lttng_ust_lib_ring_buffer *buf; |
b0a99af4 | 211 | int outfd, ret; |
ef9ff354 MD |
212 | int *shm_fd, *wait_fd; |
213 | uint64_t *memory_map_size; | |
b0a99af4 MD |
214 | |
215 | chan = shmp(handle, handle->chan); | |
216 | ||
217 | /* open stream */ | |
218 | buf = channel_get_ring_buffer(&chan->backend.config, | |
219 | chan, cpu, handle, &shm_fd, &wait_fd, &memory_map_size); | |
220 | if (!buf) | |
221 | return -ENOENT; | |
222 | ret = lib_ring_buffer_open_read(buf, handle, 1); | |
223 | if (ret) { | |
224 | return -1; | |
225 | } | |
226 | ||
227 | /* copy */ | |
5cd19802 | 228 | outfd = open(outfile, O_WRONLY | O_CREAT | O_TRUNC, |
b0a99af4 MD |
229 | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); |
230 | if (outfd < 0) { | |
231 | perror("open output"); | |
232 | return -1; | |
233 | } | |
234 | ||
235 | printf("Waiting for buffer data for %s\n", outfile); | |
236 | for (;;) { | |
237 | unsigned long read_size; | |
238 | unsigned long copy_size; | |
239 | char *ptr; | |
240 | ||
241 | ret = lib_ring_buffer_get_next_subbuf(buf, handle); | |
242 | printf("get next ret %d\n", ret); | |
243 | if (ret == -ENODATA) | |
244 | break; | |
245 | if (ret == -EAGAIN) { | |
246 | sleep(1); | |
247 | continue; | |
248 | } | |
249 | if (ret) { | |
250 | printf("Error %d in lib_ring_buffer_get_next_subbuf\n", ret); | |
251 | return -1; | |
252 | } | |
253 | read_size = lib_ring_buffer_get_read_data_size( | |
254 | &chan->backend.config, buf, handle); | |
b72687b8 | 255 | read_size = LTTNG_UST_PAGE_ALIGN(read_size); |
b0a99af4 MD |
256 | ptr = lib_ring_buffer_read_offset_address( |
257 | &buf->backend, 0, handle); | |
258 | printf("WRITE: copy %lu bytes\n", read_size); | |
259 | copy_size = write(outfd, ptr, read_size); | |
260 | if (copy_size < read_size) { | |
f97e7ae1 | 261 | printf("write issue: copied %lu, expected %lu\n", copy_size, read_size); |
b0a99af4 MD |
262 | } |
263 | lib_ring_buffer_put_next_subbuf(buf, handle); | |
264 | } | |
265 | ||
266 | ret = close(outfd); | |
267 | if (ret) { | |
268 | perror("close"); | |
269 | return -1; | |
270 | } | |
271 | ||
272 | /* close stream */ | |
273 | lib_ring_buffer_release_read(buf, handle, 1); | |
274 | return 0; | |
275 | } | |
276 | ||
277 | static | |
278 | int consume_buffers(const char *outputpath) | |
279 | { | |
280 | int k, ret; | |
281 | mode_t old_umask; | |
282 | char pathname[PATH_MAX]; | |
38fae1d3 | 283 | struct lttng_ust_shm_handle *handle; |
b0a99af4 MD |
284 | |
285 | snprintf(pathname, PATH_MAX - 1, "%s", outputpath); | |
286 | old_umask = umask(0); | |
287 | ret = mkdir(pathname, S_IRWXU | S_IRWXG); | |
288 | if (ret && errno != EEXIST) { | |
289 | perror("mkdir"); | |
290 | umask(old_umask); | |
291 | return -1; | |
292 | } | |
293 | umask(old_umask); | |
294 | ||
295 | /* copy metadata */ | |
296 | handle = map_channel(&metadata_data, | |
297 | &metadata_stream_data, 1); | |
298 | if (!handle) | |
299 | return -1; | |
300 | snprintf(pathname, PATH_MAX - 1, | |
301 | "%s/metadata", outputpath); | |
302 | ret = consume_stream(handle, -1, pathname); | |
303 | if (ret && ret != -ENOENT) { | |
304 | printf("Error in consume_stream\n"); | |
305 | return ret; | |
306 | } | |
307 | unmap_channel(handle); | |
308 | ||
309 | /* copy binary data */ | |
310 | handle = map_channel(&channel_data, | |
311 | stream_data, MAX_NR_STREAMS); | |
312 | if (!handle) | |
313 | return -1; | |
314 | for (k = 0; k < MAX_NR_STREAMS; k++) { | |
315 | snprintf(pathname, PATH_MAX - 1, | |
316 | "%s/data_%u", outputpath, k); | |
317 | ret = consume_stream(handle, k, pathname); | |
318 | if (ret && ret != -ENOENT) { | |
319 | printf("Error in consume_stream\n"); | |
320 | return ret; | |
321 | } | |
322 | } | |
323 | unmap_channel(handle); | |
324 | ||
325 | return 0; | |
326 | } | |
327 | ||
57773204 | 328 | static |
b0a99af4 MD |
329 | int send_app_msgs(int sock, const char *outputpath, |
330 | unsigned int nr_events, const char **event_names) | |
331 | { | |
57773204 MD |
332 | struct ustcomm_ust_msg lum; |
333 | struct ustcomm_ust_reply lur; | |
b0a99af4 MD |
334 | int ret, k; |
335 | ||
336 | /* Create session */ | |
337 | memset(&lum, 0, sizeof(lum)); | |
338 | lum.handle = LTTNG_UST_ROOT_HANDLE; | |
339 | lum.cmd = LTTNG_UST_SESSION; | |
57773204 | 340 | ret = ustcomm_send_app_cmd(sock, &lum, &lur); |
b0a99af4 MD |
341 | if (ret) |
342 | return ret; | |
343 | session_handle = lur.ret_val; | |
344 | printf("received session handle %u\n", session_handle); | |
345 | ||
346 | /* Create metadata channel */ | |
347 | memset(&lum, 0, sizeof(lum)); | |
348 | lum.handle = session_handle; | |
349 | lum.cmd = LTTNG_UST_METADATA; | |
350 | lum.u.channel.overwrite = 0; | |
351 | lum.u.channel.subbuf_size = 32768; | |
352 | lum.u.channel.num_subbuf = 4; | |
353 | lum.u.channel.switch_timer_interval = 0; | |
354 | lum.u.channel.read_timer_interval = 0; | |
355 | lum.u.channel.output = LTTNG_UST_MMAP; | |
57773204 | 356 | ret = ustcomm_send_app_cmd(sock, &lum, &lur); |
b0a99af4 MD |
357 | if (ret) |
358 | return ret; | |
359 | metadata_data.handle = lur.ret_val; | |
360 | printf("received metadata handle %u\n", metadata_data.handle); | |
7bc53e94 | 361 | if (lur.ret_code == LTTNG_UST_OK) { |
b0a99af4 MD |
362 | ssize_t len; |
363 | ||
364 | metadata_data.memory_map_size = lur.u.channel.memory_map_size; | |
365 | /* get shm fd */ | |
57773204 | 366 | len = ustcomm_recv_fd(sock); |
b0a99af4 MD |
367 | if (len < 0) |
368 | return -EINVAL; | |
369 | metadata_data.shm_fd = len; | |
370 | /* get wait fd */ | |
57773204 | 371 | len = ustcomm_recv_fd(sock); |
b0a99af4 MD |
372 | if (len < 0) |
373 | return -EINVAL; | |
374 | metadata_data.wait_fd = len; | |
375 | } | |
376 | ||
377 | ret = open_streams(sock, metadata_data.handle, | |
378 | &metadata_stream_data, 1); | |
379 | if (ret) { | |
380 | printf("Error in open_streams\n"); | |
381 | return ret; | |
382 | } | |
383 | ||
384 | /* Create data channel */ | |
385 | memset(&lum, 0, sizeof(lum)); | |
386 | lum.handle = session_handle; | |
387 | lum.cmd = LTTNG_UST_CHANNEL; | |
388 | //lum.u.channel.overwrite = 0; | |
389 | lum.u.channel.overwrite = 1; | |
390 | lum.u.channel.subbuf_size = 32768; | |
391 | lum.u.channel.num_subbuf = 8; | |
392 | //lum.u.channel.num_subbuf = 4; | |
393 | //lum.u.channel.num_subbuf = 2; | |
394 | lum.u.channel.switch_timer_interval = 0; | |
395 | lum.u.channel.read_timer_interval = 0; | |
396 | lum.u.channel.output = LTTNG_UST_MMAP; | |
57773204 | 397 | ret = ustcomm_send_app_cmd(sock, &lum, &lur); |
b0a99af4 MD |
398 | if (ret) |
399 | return ret; | |
400 | channel_data.handle = lur.ret_val; | |
401 | printf("received channel handle %u\n", channel_data.handle); | |
7bc53e94 | 402 | if (lur.ret_code == LTTNG_UST_OK) { |
b0a99af4 MD |
403 | ssize_t len; |
404 | ||
405 | channel_data.memory_map_size = lur.u.channel.memory_map_size; | |
406 | /* get shm fd */ | |
57773204 | 407 | len = ustcomm_recv_fd(sock); |
b0a99af4 MD |
408 | if (len < 0) |
409 | return -EINVAL; | |
410 | channel_data.shm_fd = len; | |
411 | /* get wait fd */ | |
57773204 | 412 | len = ustcomm_recv_fd(sock); |
b0a99af4 MD |
413 | if (len < 0) |
414 | return -EINVAL; | |
415 | channel_data.wait_fd = len; | |
416 | } | |
417 | ||
418 | /* Create events */ | |
419 | for (k = 0; k < nr_events; k++) { | |
420 | memset(&lum, 0, sizeof(lum)); | |
421 | lum.handle = channel_data.handle; | |
422 | lum.cmd = LTTNG_UST_EVENT; | |
423 | strncpy(lum.u.event.name, event_names[k], | |
424 | LTTNG_UST_SYM_NAME_LEN); | |
425 | lum.u.event.instrumentation = LTTNG_UST_TRACEPOINT; | |
57773204 | 426 | ret = ustcomm_send_app_cmd(sock, &lum, &lur); |
b0a99af4 MD |
427 | if (ret) |
428 | return ret; | |
429 | event_handle[k] = lur.ret_val; | |
430 | printf("received event handle %u\n", event_handle[k]); | |
431 | } | |
432 | ||
3b402b40 | 433 | /* Attach vtid context */ |
8de38cf7 MD |
434 | memset(&lum, 0, sizeof(lum)); |
435 | lum.handle = channel_data.handle; | |
436 | lum.cmd = LTTNG_UST_CONTEXT; | |
3b402b40 MD |
437 | lum.u.context.ctx = LTTNG_UST_CONTEXT_VTID; |
438 | //lum.u.context.ctx = LTTNG_UST_CONTEXT_PTHREAD_ID; | |
4847e9bb MD |
439 | //lum.u.context.ctx = LTTNG_UST_CONTEXT_VPID; |
440 | //lum.u.context.ctx = LTTNG_UST_CONTEXT_PROCNAME; | |
57773204 | 441 | ret = ustcomm_send_app_cmd(sock, &lum, &lur); |
8de38cf7 MD |
442 | if (ret) |
443 | return ret; | |
444 | context_handle = lur.ret_val; | |
445 | printf("received context handle %u\n", context_handle); | |
446 | ||
b0a99af4 MD |
447 | /* Get references to channel streams */ |
448 | ret = open_streams(sock, channel_data.handle, | |
449 | stream_data, MAX_NR_STREAMS); | |
450 | if (ret) { | |
451 | printf("Error in open_streams\n"); | |
452 | return ret; | |
453 | } | |
454 | ||
455 | memset(&lum, 0, sizeof(lum)); | |
456 | lum.handle = session_handle; | |
457 | lum.cmd = LTTNG_UST_SESSION_START; | |
57773204 | 458 | ret = ustcomm_send_app_cmd(sock, &lum, &lur); |
b0a99af4 MD |
459 | if (ret) |
460 | return ret; | |
461 | printf("Session handle %u started.\n", session_handle); | |
462 | ||
463 | /* Tell application registration is done */ | |
464 | memset(&lum, 0, sizeof(lum)); | |
465 | lum.handle = LTTNG_UST_ROOT_HANDLE; | |
466 | lum.cmd = LTTNG_UST_REGISTER_DONE; | |
57773204 | 467 | ret = ustcomm_send_app_cmd(sock, &lum, &lur); |
b0a99af4 MD |
468 | if (ret) |
469 | return ret; | |
470 | printf("Registration done acknowledged.\n"); | |
471 | ||
472 | sleep(4); | |
473 | ||
474 | ret = consume_buffers(outputpath); | |
475 | if (ret) { | |
476 | printf("Error in consume_buffers\n"); | |
477 | return ret; | |
478 | } | |
479 | ||
480 | /* Release data channel */ | |
481 | /* Release streams */ | |
482 | ret = close_streams(sock, stream_data, | |
483 | MAX_NR_STREAMS); | |
484 | if (ret) | |
485 | return ret; | |
486 | ||
8de38cf7 MD |
487 | /* Release context */ |
488 | memset(&lum, 0, sizeof(lum)); | |
489 | lum.handle = context_handle; | |
490 | lum.cmd = LTTNG_UST_RELEASE; | |
57773204 | 491 | ret = ustcomm_send_app_cmd(sock, &lum, &lur); |
8de38cf7 MD |
492 | if (ret) |
493 | return ret; | |
494 | ||
b0a99af4 MD |
495 | /* Release events */ |
496 | for (k = 0; k < nr_events; k++) { | |
497 | memset(&lum, 0, sizeof(lum)); | |
498 | lum.handle = event_handle[k]; | |
499 | lum.cmd = LTTNG_UST_RELEASE; | |
57773204 | 500 | ret = ustcomm_send_app_cmd(sock, &lum, &lur); |
b0a99af4 MD |
501 | if (ret) |
502 | return ret; | |
503 | } | |
504 | memset(&lum, 0, sizeof(lum)); | |
505 | lum.handle = channel_data.handle; | |
506 | lum.cmd = LTTNG_UST_RELEASE; | |
57773204 | 507 | ret = ustcomm_send_app_cmd(sock, &lum, &lur); |
b0a99af4 MD |
508 | if (ret) |
509 | return ret; | |
510 | if (channel_data.shm_fd >= 0) { | |
511 | ret = close(channel_data.shm_fd); | |
512 | if (ret) | |
513 | return ret; | |
514 | } | |
515 | if (channel_data.wait_fd >= 0) { | |
516 | ret = close(channel_data.wait_fd); | |
517 | if (ret) | |
518 | return ret; | |
519 | } | |
520 | ||
521 | /* Release metadata channel */ | |
522 | ret = close_streams(sock, &metadata_stream_data, 1); | |
523 | if (ret) | |
524 | return ret; | |
525 | ||
526 | memset(&lum, 0, sizeof(lum)); | |
527 | lum.handle = metadata_data.handle; | |
528 | lum.cmd = LTTNG_UST_RELEASE; | |
57773204 | 529 | ret = ustcomm_send_app_cmd(sock, &lum, &lur); |
b0a99af4 MD |
530 | if (ret) |
531 | return ret; | |
532 | if (metadata_data.shm_fd >= 0) { | |
533 | ret = close(metadata_data.shm_fd); | |
534 | if (ret) | |
535 | return ret; | |
536 | } | |
537 | if (metadata_data.wait_fd >= 0) { | |
538 | ret = close(metadata_data.wait_fd); | |
539 | if (ret) | |
540 | return ret; | |
541 | } | |
542 | ||
543 | /* Release session */ | |
544 | memset(&lum, 0, sizeof(lum)); | |
545 | lum.handle = session_handle; | |
546 | lum.cmd = LTTNG_UST_RELEASE; | |
57773204 | 547 | ret = ustcomm_send_app_cmd(sock, &lum, &lur); |
b0a99af4 MD |
548 | if (ret) |
549 | return ret; | |
550 | ||
551 | return 0; | |
552 | } | |
553 | ||
554 | /* | |
555 | * Using fork to set umask in the child process (not multi-thread safe). We | |
556 | * deal with the shm_open vs ftruncate race (happening when the sessiond owns | |
557 | * the shm and does not let everybody modify it, to ensure safety against | |
558 | * shm_unlink) by simply letting the mmap fail and retrying after a few | |
559 | * seconds. For global shm, everybody has rw access to it until the sessiond | |
560 | * starts. | |
561 | */ | |
562 | static int get_wait_shm(char *shm_path, size_t mmap_size, int global) | |
563 | { | |
564 | int wait_shm_fd, ret; | |
565 | mode_t mode; | |
566 | ||
567 | /* Default permissions */ | |
568 | mode = S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP; | |
569 | ||
570 | /* Change owner of the shm path */ | |
571 | if (global) { | |
572 | ret = chown(shm_path, 0, 0); | |
573 | if (ret < 0) { | |
574 | if (errno != ENOENT) { | |
575 | perror("chown wait shm"); | |
576 | goto error; | |
577 | } | |
578 | } | |
579 | ||
580 | /* | |
581 | * If global session daemon, any application can register so the shm | |
582 | * needs to be set in read-only mode for others. | |
583 | */ | |
584 | mode |= S_IROTH; | |
585 | } else { | |
586 | ret = chown(shm_path, getuid(), getgid()); | |
587 | if (ret < 0) { | |
588 | if (errno != ENOENT) { | |
589 | perror("chown wait shm"); | |
590 | goto error; | |
591 | } | |
592 | } | |
593 | } | |
594 | ||
595 | /* | |
596 | * Set permissions to the shm even if we did not create the shm. | |
597 | */ | |
598 | ret = chmod(shm_path, mode); | |
599 | if (ret < 0) { | |
600 | if (errno != ENOENT) { | |
601 | perror("chmod wait shm"); | |
602 | goto error; | |
603 | } | |
604 | } | |
605 | ||
606 | /* | |
607 | * We're alone in a child process, so we can modify the process-wide | |
608 | * umask. | |
609 | */ | |
610 | umask(~mode); | |
611 | ||
612 | /* | |
613 | * Try creating shm (or get rw access). We don't do an exclusive open, | |
614 | * because we allow other processes to create+ftruncate it concurrently. | |
615 | */ | |
616 | wait_shm_fd = shm_open(shm_path, O_RDWR | O_CREAT, mode); | |
617 | if (wait_shm_fd < 0) { | |
618 | perror("shm_open wait shm"); | |
619 | goto error; | |
620 | } | |
621 | ||
622 | ret = ftruncate(wait_shm_fd, mmap_size); | |
623 | if (ret < 0) { | |
624 | perror("ftruncate wait shm"); | |
625 | exit(EXIT_FAILURE); | |
626 | } | |
627 | ||
628 | ret = fchmod(wait_shm_fd, mode); | |
629 | if (ret < 0) { | |
630 | perror("fchmod"); | |
631 | exit(EXIT_FAILURE); | |
632 | } | |
633 | ||
634 | printf("Got the wait shm fd %d\n", wait_shm_fd); | |
635 | ||
636 | return wait_shm_fd; | |
637 | ||
638 | error: | |
639 | printf("Failing to get the wait shm fd\n"); | |
640 | ||
641 | return -1; | |
642 | } | |
643 | ||
644 | int update_futex(int fd, int active) | |
645 | { | |
172d6b68 | 646 | long page_size; |
b0a99af4 MD |
647 | char *wait_shm_mmap; |
648 | int ret; | |
649 | ||
172d6b68 | 650 | page_size = sysconf(_SC_PAGE_SIZE); |
2657d1ba MD |
651 | if (page_size <= 0) { |
652 | if (!page_size) { | |
653 | errno = EINVAL; | |
654 | } | |
655 | perror("Error in sysconf(_SC_PAGE_SIZE)"); | |
172d6b68 MD |
656 | goto error; |
657 | } | |
658 | wait_shm_mmap = mmap(NULL, page_size, PROT_READ | PROT_WRITE, | |
b0a99af4 MD |
659 | MAP_SHARED, fd, 0); |
660 | if (wait_shm_mmap == MAP_FAILED) { | |
661 | perror("mmap"); | |
662 | goto error; | |
663 | } | |
664 | ||
665 | if (active) { | |
666 | uatomic_set((int32_t *) wait_shm_mmap, 1); | |
ee7fcec8 MD |
667 | if (futex_async((int32_t *) wait_shm_mmap, FUTEX_WAKE, |
668 | INT_MAX, NULL, NULL, 0) < 0) { | |
669 | perror("futex_async"); | |
670 | goto error; | |
671 | } | |
b0a99af4 MD |
672 | } else { |
673 | uatomic_set((int32_t *) wait_shm_mmap, 0); | |
674 | } | |
172d6b68 | 675 | ret = munmap(wait_shm_mmap, page_size); |
b0a99af4 MD |
676 | if (ret) { |
677 | perror("Error unmapping wait shm"); | |
678 | goto error; | |
679 | } | |
680 | return 0; | |
681 | error: | |
682 | return -1; | |
683 | } | |
684 | ||
685 | /* | |
686 | * Set open files limit to unlimited. This daemon can open a large number of | |
687 | * file descriptors in order to consumer multiple kernel traces. | |
688 | */ | |
689 | static void set_ulimit(void) | |
690 | { | |
691 | int ret; | |
692 | struct rlimit lim; | |
693 | ||
694 | /* | |
695 | * If not root, we cannot increase our max open files. But our | |
696 | * scope is then limited to processes from a single user. | |
697 | */ | |
698 | if (getuid() != 0) | |
699 | return; | |
700 | /* The kernel does not allowed an infinite limit for open files */ | |
701 | lim.rlim_cur = 65535; | |
702 | lim.rlim_max = 65535; | |
703 | ||
704 | ret = setrlimit(RLIMIT_NOFILE, &lim); | |
705 | if (ret < 0) { | |
706 | perror("failed to set open files limit"); | |
707 | } | |
708 | } | |
709 | ||
710 | /* | |
711 | * Usage: | |
712 | * ./ust-basic-tracing outputpath event_name1 event_name2 .... | |
713 | */ | |
714 | int main(int argc, const char **argv) | |
715 | { | |
716 | const char *home_dir; | |
3d39c98c CB |
717 | char home_rundir[PATH_MAX]; |
718 | char *cmd = NULL; | |
b0a99af4 MD |
719 | int ret, wait_shm_fd; |
720 | struct sigaction act; | |
fb50c39d | 721 | mode_t old_umask = 0; |
b0a99af4 MD |
722 | const char *outputpath; |
723 | const char **event_names; | |
724 | unsigned int nr_events; | |
2657d1ba | 725 | long page_size; |
b0a99af4 MD |
726 | |
727 | if (argc < 2) { | |
728 | printf("Usage:\n"); | |
729 | printf("%s outputpath event_name1 event_name2 ...\n", | |
730 | argv[0]); | |
731 | exit(-1); | |
732 | } | |
733 | outputpath = argv[1]; | |
734 | event_names = &argv[2]; | |
735 | nr_events = argc - 2; | |
736 | ||
737 | set_ulimit(); | |
738 | ||
739 | /* Ignore sigpipe */ | |
740 | memset(&act, 0, sizeof(act)); | |
741 | ret = sigemptyset(&act.sa_mask); | |
742 | if (ret == -1) { | |
743 | perror("sigemptyset"); | |
744 | return -1; | |
745 | } | |
746 | ||
747 | act.sa_handler = SIG_IGN; | |
748 | ret = sigaction(SIGPIPE, &act, NULL); | |
749 | if (ret == -1) { | |
750 | perror("sigaction"); | |
751 | return -1; | |
752 | } | |
753 | ||
754 | /* Handle SIGTERM */ | |
755 | act.sa_handler = handle_signals; | |
756 | ret = sigaction(SIGTERM, &act, NULL); | |
757 | if (ret == -1) { | |
758 | perror("sigaction"); | |
759 | return -1; | |
760 | } | |
761 | /* Handle SIGINT */ | |
762 | ret = sigaction(SIGINT, &act, NULL); | |
763 | if (ret == -1) { | |
764 | perror("sigaction"); | |
765 | return -1; | |
766 | } | |
767 | ||
2657d1ba MD |
768 | page_size = sysconf(_SC_PAGE_SIZE); |
769 | if (page_size <= 0) { | |
770 | if (!page_size) { | |
771 | errno = EINVAL; | |
772 | } | |
773 | perror("Error in sysconf(_SC_PAGE_SIZE)"); | |
774 | return -1; | |
775 | } | |
776 | ||
b0a99af4 MD |
777 | if (geteuid() == 0) { |
778 | ret = mkdir(LTTNG_RUNDIR, S_IRWXU | S_IRWXG | S_IROTH | S_IXOTH); | |
779 | if (ret && errno != EEXIST) { | |
780 | perror("mkdir"); | |
781 | return -1; | |
782 | } | |
783 | wait_shm_fd = get_wait_shm(DEFAULT_GLOBAL_APPS_WAIT_SHM_PATH, | |
2657d1ba | 784 | page_size, 1); |
b0a99af4 MD |
785 | if (wait_shm_fd < 0) { |
786 | perror("global wait shm error"); | |
787 | return -1; | |
788 | } | |
789 | strcpy(apps_sock_path, DEFAULT_GLOBAL_APPS_UNIX_SOCK); | |
790 | old_umask = umask(0); | |
791 | } else { | |
3d39c98c CB |
792 | home_dir = (const char *) getenv("HOME"); |
793 | if (!home_dir) { | |
794 | perror("getenv error"); | |
795 | return -ENOENT; | |
796 | } | |
797 | ||
798 | snprintf(home_rundir, PATH_MAX, | |
799 | LTTNG_HOME_RUNDIR, home_dir); | |
800 | ||
801 | ret = mkdir(home_rundir, S_IRWXU | S_IRWXG | S_IROTH | S_IXOTH); | |
802 | if (ret && errno != EEXIST) { | |
803 | perror("mkdir"); | |
804 | return -1; | |
805 | } | |
806 | ||
b0a99af4 MD |
807 | snprintf(local_apps_wait_shm_path, PATH_MAX, |
808 | DEFAULT_HOME_APPS_WAIT_SHM_PATH, getuid()); | |
809 | wait_shm_fd = get_wait_shm(local_apps_wait_shm_path, | |
2657d1ba | 810 | page_size, 0); |
b0a99af4 MD |
811 | if (wait_shm_fd < 0) { |
812 | perror("local wait shm error"); | |
813 | return -1; | |
814 | } | |
b0a99af4 MD |
815 | snprintf(apps_sock_path, PATH_MAX, |
816 | DEFAULT_HOME_APPS_UNIX_SOCK, home_dir); | |
817 | } | |
818 | ||
57773204 | 819 | ret = ustcomm_create_unix_sock(apps_sock_path); |
b0a99af4 MD |
820 | if (ret < 0) { |
821 | perror("create error"); | |
822 | return ret; | |
823 | } | |
824 | apps_socket = ret; | |
825 | ||
826 | if (getuid() == 0) { | |
827 | /* File permission MUST be 666 */ | |
828 | ret = chmod(apps_sock_path, | |
829 | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH); | |
830 | if (ret < 0) { | |
831 | printf("Set file permissions failed: %s\n", apps_sock_path); | |
832 | perror("chmod"); | |
833 | goto end; | |
834 | } | |
835 | umask(old_umask); | |
836 | } | |
57773204 | 837 | ret = ustcomm_listen_unix_sock(apps_socket); |
b0a99af4 MD |
838 | if (ret < 0) { |
839 | perror("listen error"); | |
840 | return ret; | |
841 | } | |
842 | ||
843 | /* wake up futexes */ | |
844 | ret = update_futex(wait_shm_fd, 1); | |
845 | if (ret) { | |
846 | fprintf(stderr, "Error wakeup futex\n"); | |
847 | return -1; | |
848 | } | |
849 | ||
850 | for (;;) { | |
851 | int sock; | |
852 | ssize_t len; | |
853 | struct { | |
854 | uint32_t major; | |
855 | uint32_t minor; | |
856 | pid_t pid; | |
857 | pid_t ppid; | |
858 | uid_t uid; | |
859 | gid_t gid; | |
1a34b35b | 860 | uint32_t bits_per_long; |
b0a99af4 MD |
861 | char name[16]; /* Process name */ |
862 | } reg_msg; | |
863 | char bufname[17]; | |
864 | ||
865 | if (quit_program) | |
866 | break; | |
867 | ||
868 | printf("Accepting application registration\n"); | |
57773204 | 869 | sock = ustcomm_accept_unix_sock(apps_socket); |
b0a99af4 MD |
870 | if (sock < 0) { |
871 | perror("accept error"); | |
872 | goto end; | |
873 | } | |
874 | ||
875 | /* | |
876 | * Basic recv here to handle the very simple data | |
877 | * that the libust send to register (reg_msg). | |
878 | */ | |
57773204 | 879 | len = ustcomm_recv_unix_sock(sock, ®_msg, sizeof(reg_msg)); |
b0a99af4 | 880 | if (len < 0 || len != sizeof(reg_msg)) { |
57773204 | 881 | perror("ustcomm_recv_unix_sock"); |
b0a99af4 MD |
882 | continue; |
883 | } | |
884 | memcpy(bufname, reg_msg.name, 16); | |
885 | bufname[16] = '\0'; | |
886 | printf("Application %s pid %u ppid %u uid %u gid %u has registered (version : %u.%u)\n", | |
887 | bufname, reg_msg.pid, reg_msg.ppid, reg_msg.uid, | |
888 | reg_msg.gid, reg_msg.major, reg_msg.minor); | |
889 | ret = send_app_msgs(sock, outputpath, nr_events, event_names); | |
890 | if (ret) { | |
891 | printf("Error in send_app_msgs.\n"); | |
892 | sleep(1); | |
893 | } | |
894 | close(sock); | |
895 | } | |
896 | ||
897 | end: | |
898 | printf("quitting.\n"); | |
899 | /* Let applications know we are not responding anymore */ | |
900 | ret = update_futex(wait_shm_fd, 0); | |
901 | if (ret) { | |
902 | fprintf(stderr, "Error wakeup futex\n"); | |
903 | return -1; | |
904 | } | |
905 | ||
3d39c98c CB |
906 | if (geteuid()) { |
907 | printf("Removing %s directory\n", home_rundir); | |
908 | ret = asprintf(&cmd, "rm -rf %s", home_rundir); | |
909 | if (ret < 0) { | |
910 | printf("asprintf failed. Something is really wrong!\n"); | |
911 | return -1; | |
912 | } | |
913 | ||
914 | /* Remove lttng run directory */ | |
915 | ret = system(cmd); | |
916 | if (ret < 0) { | |
917 | printf("Unable to clean %s\n", home_rundir); | |
918 | return -1; | |
919 | } | |
920 | } | |
921 | ||
922 | ||
b0a99af4 MD |
923 | return 0; |
924 | } |