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 | * | |
7 | * This program is free software; you can redistribute it and/or modify it | |
8 | * under the terms of the GNU General Public License as published by the Free | |
9 | * Software Foundation; only version 2 of the License. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, but WITHOUT | |
12 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
13 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
14 | * more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License along with | |
17 | * this program; if not, write to the Free Software Foundation, Inc., 59 Temple | |
18 | * Place - Suite 330, Boston, MA 02111-1307, USA. | |
19 | */ | |
20 | ||
21 | #define _LARGEFILE64_SOURCE | |
9d335227 | 22 | #define _GNU_SOURCE |
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> | |
32 | #include <fcntl.h> | |
33 | #include <sys/mman.h> | |
34 | #include <limits.h> | |
35 | #include <urcu/futex.h> | |
36 | #include <urcu/uatomic.h> | |
37 | #include <assert.h> | |
38 | #include <sys/socket.h> | |
39 | ||
a3bb4b27 | 40 | #include <ust-comm.h> |
b0a99af4 MD |
41 | #include "../../libringbuffer/backend.h" |
42 | #include "../../libringbuffer/frontend.h" | |
43 | ||
44 | #define MAX_NR_STREAMS 64 | |
45 | #define MAX_NR_EVENTS 128 | |
46 | ||
b0a99af4 | 47 | static int session_handle; |
61f02aea MD |
48 | static struct lttng_ust_object_data metadata_stream_data; |
49 | static struct lttng_ust_object_data metadata_data; | |
50 | static struct lttng_ust_object_data channel_data; | |
51 | static struct lttng_ust_object_data stream_data[MAX_NR_STREAMS]; | |
b0a99af4 | 52 | static int event_handle[MAX_NR_EVENTS]; |
8de38cf7 | 53 | static int context_handle; |
b0a99af4 MD |
54 | |
55 | static int apps_socket = -1; | |
56 | static char apps_sock_path[PATH_MAX]; | |
57 | static char local_apps_wait_shm_path[PATH_MAX]; | |
58 | ||
59 | static volatile int quit_program; | |
60 | ||
61 | static void handle_signals(int signo) | |
62 | { | |
63 | quit_program = 1; | |
64 | } | |
65 | ||
b0a99af4 | 66 | static |
61f02aea | 67 | int open_streams(int sock, int channel_handle, struct lttng_ust_object_data *stream_datas, |
b0a99af4 MD |
68 | int nr_check) |
69 | { | |
70 | int ret, k = 0; | |
71 | ||
72 | for (;;) { | |
57773204 MD |
73 | struct ustcomm_ust_msg lum; |
74 | struct ustcomm_ust_reply lur; | |
b0a99af4 MD |
75 | |
76 | memset(&lum, 0, sizeof(lum)); | |
77 | lum.handle = channel_handle; | |
78 | lum.cmd = LTTNG_UST_STREAM; | |
57773204 | 79 | ret = ustcomm_send_app_cmd(sock, &lum, &lur); |
b0a99af4 MD |
80 | if (!ret) { |
81 | assert(k < nr_check); | |
82 | stream_datas[k].handle = lur.ret_val; | |
83 | printf("received stream handle %u\n", | |
84 | stream_datas[k].handle); | |
57773204 | 85 | if (lur.ret_code == USTCOMM_OK) { |
b0a99af4 MD |
86 | ssize_t len; |
87 | ||
88 | stream_datas[k].memory_map_size = lur.u.stream.memory_map_size; | |
89 | /* get shm fd */ | |
57773204 | 90 | len = ustcomm_recv_fd(sock); |
b0a99af4 MD |
91 | if (len < 0) |
92 | return -EINVAL; | |
93 | stream_datas[k].shm_fd = len; | |
94 | /* get wait fd */ | |
57773204 | 95 | len = ustcomm_recv_fd(sock); |
b0a99af4 MD |
96 | if (len < 0) |
97 | return -EINVAL; | |
98 | stream_datas[k].wait_fd = len; | |
99 | } | |
100 | k++; | |
101 | } | |
102 | if (ret == -ENOENT) | |
103 | break; | |
104 | if (ret) | |
105 | return ret; | |
106 | } | |
107 | return 0; | |
108 | } | |
109 | ||
110 | static | |
61f02aea | 111 | int close_streams(int sock, struct lttng_ust_object_data *stream_datas, int nr_check) |
b0a99af4 MD |
112 | { |
113 | int ret, k; | |
114 | ||
115 | for (k = 0; k < nr_check; k++) { | |
57773204 MD |
116 | struct ustcomm_ust_msg lum; |
117 | struct ustcomm_ust_reply lur; | |
b0a99af4 MD |
118 | |
119 | if (!stream_datas[k].handle) | |
120 | continue; | |
121 | memset(&lum, 0, sizeof(lum)); | |
122 | lum.handle = stream_datas[k].handle; | |
123 | lum.cmd = LTTNG_UST_RELEASE; | |
57773204 | 124 | ret = ustcomm_send_app_cmd(sock, &lum, &lur); |
b0a99af4 MD |
125 | if (ret) { |
126 | printf("Error closing stream\n"); | |
127 | return ret; | |
128 | } | |
129 | if (stream_datas[k].shm_fd >= 0) { | |
130 | ret = close(stream_datas[k].shm_fd); | |
131 | if (ret) { | |
132 | printf("Error closing stream shm_fd\n"); | |
133 | return ret; | |
134 | } | |
135 | } | |
136 | if (stream_datas[k].wait_fd >= 0) { | |
137 | ret = close(stream_datas[k].wait_fd); | |
138 | if (ret) { | |
139 | printf("Error closing stream wait_fd\n"); | |
140 | return ret; | |
141 | } | |
142 | } | |
143 | } | |
144 | return 0; | |
145 | } | |
146 | ||
147 | static | |
38fae1d3 | 148 | struct lttng_ust_shm_handle *map_channel(struct lttng_ust_object_data *chan_data, |
61f02aea | 149 | struct lttng_ust_object_data *stream_datas, int nr_check) |
b0a99af4 | 150 | { |
38fae1d3 | 151 | struct lttng_ust_shm_handle *handle; |
b0a99af4 MD |
152 | struct channel *chan; |
153 | int k, ret; | |
154 | ||
155 | /* map metadata channel */ | |
156 | handle = channel_handle_create(chan_data->shm_fd, | |
157 | chan_data->wait_fd, | |
158 | chan_data->memory_map_size); | |
159 | if (!handle) { | |
160 | printf("create handle error\n"); | |
161 | return NULL; | |
162 | } | |
163 | chan_data->shm_fd = -1; | |
164 | chan_data->wait_fd = -1; | |
165 | chan = shmp(handle, handle->chan); | |
166 | ||
167 | for (k = 0; k < nr_check; k++) { | |
61f02aea | 168 | struct lttng_ust_object_data *stream_data = &stream_datas[k]; |
b0a99af4 MD |
169 | |
170 | if (!stream_data->handle) | |
171 | break; | |
172 | /* map stream */ | |
173 | ret = channel_handle_add_stream(handle, | |
174 | stream_data->shm_fd, | |
175 | stream_data->wait_fd, | |
176 | stream_data->memory_map_size); | |
177 | if (ret) { | |
178 | printf("add stream error\n"); | |
179 | goto error_destroy; | |
180 | } | |
181 | stream_data->shm_fd = -1; | |
182 | stream_data->wait_fd = -1; | |
183 | } | |
184 | return handle; | |
185 | ||
186 | error_destroy: | |
187 | channel_destroy(chan, handle, 1); | |
188 | return NULL; | |
189 | } | |
190 | ||
191 | static | |
38fae1d3 | 192 | void unmap_channel(struct lttng_ust_shm_handle *handle) |
b0a99af4 MD |
193 | { |
194 | struct channel *chan; | |
195 | ||
196 | chan = shmp(handle, handle->chan); | |
197 | /* unmap channel */ | |
198 | channel_destroy(chan, handle, 1); | |
199 | } | |
200 | ||
201 | static | |
38fae1d3 | 202 | int consume_stream(struct lttng_ust_shm_handle *handle, int cpu, char *outfile) |
b0a99af4 MD |
203 | { |
204 | struct channel *chan; | |
4cfec15c | 205 | struct lttng_ust_lib_ring_buffer *buf; |
b0a99af4 | 206 | int outfd, ret; |
ef9ff354 MD |
207 | int *shm_fd, *wait_fd; |
208 | uint64_t *memory_map_size; | |
b0a99af4 MD |
209 | |
210 | chan = shmp(handle, handle->chan); | |
211 | ||
212 | /* open stream */ | |
213 | buf = channel_get_ring_buffer(&chan->backend.config, | |
214 | chan, cpu, handle, &shm_fd, &wait_fd, &memory_map_size); | |
215 | if (!buf) | |
216 | return -ENOENT; | |
217 | ret = lib_ring_buffer_open_read(buf, handle, 1); | |
218 | if (ret) { | |
219 | return -1; | |
220 | } | |
221 | ||
222 | /* copy */ | |
223 | outfd = open(outfile, O_WRONLY | O_CREAT | O_LARGEFILE | O_TRUNC, | |
224 | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); | |
225 | if (outfd < 0) { | |
226 | perror("open output"); | |
227 | return -1; | |
228 | } | |
229 | ||
230 | printf("Waiting for buffer data for %s\n", outfile); | |
231 | for (;;) { | |
232 | unsigned long read_size; | |
233 | unsigned long copy_size; | |
234 | char *ptr; | |
235 | ||
236 | ret = lib_ring_buffer_get_next_subbuf(buf, handle); | |
237 | printf("get next ret %d\n", ret); | |
238 | if (ret == -ENODATA) | |
239 | break; | |
240 | if (ret == -EAGAIN) { | |
241 | sleep(1); | |
242 | continue; | |
243 | } | |
244 | if (ret) { | |
245 | printf("Error %d in lib_ring_buffer_get_next_subbuf\n", ret); | |
246 | return -1; | |
247 | } | |
248 | read_size = lib_ring_buffer_get_read_data_size( | |
249 | &chan->backend.config, buf, handle); | |
250 | read_size = PAGE_ALIGN(read_size); | |
251 | ptr = lib_ring_buffer_read_offset_address( | |
252 | &buf->backend, 0, handle); | |
253 | printf("WRITE: copy %lu bytes\n", read_size); | |
254 | copy_size = write(outfd, ptr, read_size); | |
255 | if (copy_size < read_size) { | |
f97e7ae1 | 256 | printf("write issue: copied %lu, expected %lu\n", copy_size, read_size); |
b0a99af4 MD |
257 | } |
258 | lib_ring_buffer_put_next_subbuf(buf, handle); | |
259 | } | |
260 | ||
261 | ret = close(outfd); | |
262 | if (ret) { | |
263 | perror("close"); | |
264 | return -1; | |
265 | } | |
266 | ||
267 | /* close stream */ | |
268 | lib_ring_buffer_release_read(buf, handle, 1); | |
269 | return 0; | |
270 | } | |
271 | ||
272 | static | |
273 | int consume_buffers(const char *outputpath) | |
274 | { | |
275 | int k, ret; | |
276 | mode_t old_umask; | |
277 | char pathname[PATH_MAX]; | |
38fae1d3 | 278 | struct lttng_ust_shm_handle *handle; |
b0a99af4 MD |
279 | |
280 | snprintf(pathname, PATH_MAX - 1, "%s", outputpath); | |
281 | old_umask = umask(0); | |
282 | ret = mkdir(pathname, S_IRWXU | S_IRWXG); | |
283 | if (ret && errno != EEXIST) { | |
284 | perror("mkdir"); | |
285 | umask(old_umask); | |
286 | return -1; | |
287 | } | |
288 | umask(old_umask); | |
289 | ||
290 | /* copy metadata */ | |
291 | handle = map_channel(&metadata_data, | |
292 | &metadata_stream_data, 1); | |
293 | if (!handle) | |
294 | return -1; | |
295 | snprintf(pathname, PATH_MAX - 1, | |
296 | "%s/metadata", outputpath); | |
297 | ret = consume_stream(handle, -1, pathname); | |
298 | if (ret && ret != -ENOENT) { | |
299 | printf("Error in consume_stream\n"); | |
300 | return ret; | |
301 | } | |
302 | unmap_channel(handle); | |
303 | ||
304 | /* copy binary data */ | |
305 | handle = map_channel(&channel_data, | |
306 | stream_data, MAX_NR_STREAMS); | |
307 | if (!handle) | |
308 | return -1; | |
309 | for (k = 0; k < MAX_NR_STREAMS; k++) { | |
310 | snprintf(pathname, PATH_MAX - 1, | |
311 | "%s/data_%u", outputpath, k); | |
312 | ret = consume_stream(handle, k, pathname); | |
313 | if (ret && ret != -ENOENT) { | |
314 | printf("Error in consume_stream\n"); | |
315 | return ret; | |
316 | } | |
317 | } | |
318 | unmap_channel(handle); | |
319 | ||
320 | return 0; | |
321 | } | |
322 | ||
57773204 | 323 | static |
b0a99af4 MD |
324 | int send_app_msgs(int sock, const char *outputpath, |
325 | unsigned int nr_events, const char **event_names) | |
326 | { | |
57773204 MD |
327 | struct ustcomm_ust_msg lum; |
328 | struct ustcomm_ust_reply lur; | |
b0a99af4 MD |
329 | int ret, k; |
330 | ||
331 | /* Create session */ | |
332 | memset(&lum, 0, sizeof(lum)); | |
333 | lum.handle = LTTNG_UST_ROOT_HANDLE; | |
334 | lum.cmd = LTTNG_UST_SESSION; | |
57773204 | 335 | ret = ustcomm_send_app_cmd(sock, &lum, &lur); |
b0a99af4 MD |
336 | if (ret) |
337 | return ret; | |
338 | session_handle = lur.ret_val; | |
339 | printf("received session handle %u\n", session_handle); | |
340 | ||
341 | /* Create metadata channel */ | |
342 | memset(&lum, 0, sizeof(lum)); | |
343 | lum.handle = session_handle; | |
344 | lum.cmd = LTTNG_UST_METADATA; | |
345 | lum.u.channel.overwrite = 0; | |
346 | lum.u.channel.subbuf_size = 32768; | |
347 | lum.u.channel.num_subbuf = 4; | |
348 | lum.u.channel.switch_timer_interval = 0; | |
349 | lum.u.channel.read_timer_interval = 0; | |
350 | lum.u.channel.output = LTTNG_UST_MMAP; | |
57773204 | 351 | ret = ustcomm_send_app_cmd(sock, &lum, &lur); |
b0a99af4 MD |
352 | if (ret) |
353 | return ret; | |
354 | metadata_data.handle = lur.ret_val; | |
355 | printf("received metadata handle %u\n", metadata_data.handle); | |
57773204 | 356 | if (lur.ret_code == USTCOMM_OK) { |
b0a99af4 MD |
357 | ssize_t len; |
358 | ||
359 | metadata_data.memory_map_size = lur.u.channel.memory_map_size; | |
360 | /* get shm fd */ | |
57773204 | 361 | len = ustcomm_recv_fd(sock); |
b0a99af4 MD |
362 | if (len < 0) |
363 | return -EINVAL; | |
364 | metadata_data.shm_fd = len; | |
365 | /* get wait fd */ | |
57773204 | 366 | len = ustcomm_recv_fd(sock); |
b0a99af4 MD |
367 | if (len < 0) |
368 | return -EINVAL; | |
369 | metadata_data.wait_fd = len; | |
370 | } | |
371 | ||
372 | ret = open_streams(sock, metadata_data.handle, | |
373 | &metadata_stream_data, 1); | |
374 | if (ret) { | |
375 | printf("Error in open_streams\n"); | |
376 | return ret; | |
377 | } | |
378 | ||
379 | /* Create data channel */ | |
380 | memset(&lum, 0, sizeof(lum)); | |
381 | lum.handle = session_handle; | |
382 | lum.cmd = LTTNG_UST_CHANNEL; | |
383 | //lum.u.channel.overwrite = 0; | |
384 | lum.u.channel.overwrite = 1; | |
385 | lum.u.channel.subbuf_size = 32768; | |
386 | lum.u.channel.num_subbuf = 8; | |
387 | //lum.u.channel.num_subbuf = 4; | |
388 | //lum.u.channel.num_subbuf = 2; | |
389 | lum.u.channel.switch_timer_interval = 0; | |
390 | lum.u.channel.read_timer_interval = 0; | |
391 | lum.u.channel.output = LTTNG_UST_MMAP; | |
57773204 | 392 | ret = ustcomm_send_app_cmd(sock, &lum, &lur); |
b0a99af4 MD |
393 | if (ret) |
394 | return ret; | |
395 | channel_data.handle = lur.ret_val; | |
396 | printf("received channel handle %u\n", channel_data.handle); | |
57773204 | 397 | if (lur.ret_code == USTCOMM_OK) { |
b0a99af4 MD |
398 | ssize_t len; |
399 | ||
400 | channel_data.memory_map_size = lur.u.channel.memory_map_size; | |
401 | /* get shm fd */ | |
57773204 | 402 | len = ustcomm_recv_fd(sock); |
b0a99af4 MD |
403 | if (len < 0) |
404 | return -EINVAL; | |
405 | channel_data.shm_fd = len; | |
406 | /* get wait fd */ | |
57773204 | 407 | len = ustcomm_recv_fd(sock); |
b0a99af4 MD |
408 | if (len < 0) |
409 | return -EINVAL; | |
410 | channel_data.wait_fd = len; | |
411 | } | |
412 | ||
413 | /* Create events */ | |
414 | for (k = 0; k < nr_events; k++) { | |
415 | memset(&lum, 0, sizeof(lum)); | |
416 | lum.handle = channel_data.handle; | |
417 | lum.cmd = LTTNG_UST_EVENT; | |
418 | strncpy(lum.u.event.name, event_names[k], | |
419 | LTTNG_UST_SYM_NAME_LEN); | |
420 | lum.u.event.instrumentation = LTTNG_UST_TRACEPOINT; | |
57773204 | 421 | ret = ustcomm_send_app_cmd(sock, &lum, &lur); |
b0a99af4 MD |
422 | if (ret) |
423 | return ret; | |
424 | event_handle[k] = lur.ret_val; | |
425 | printf("received event handle %u\n", event_handle[k]); | |
426 | } | |
427 | ||
3b402b40 | 428 | /* Attach vtid context */ |
8de38cf7 MD |
429 | memset(&lum, 0, sizeof(lum)); |
430 | lum.handle = channel_data.handle; | |
431 | lum.cmd = LTTNG_UST_CONTEXT; | |
3b402b40 MD |
432 | lum.u.context.ctx = LTTNG_UST_CONTEXT_VTID; |
433 | //lum.u.context.ctx = LTTNG_UST_CONTEXT_PTHREAD_ID; | |
4847e9bb MD |
434 | //lum.u.context.ctx = LTTNG_UST_CONTEXT_VPID; |
435 | //lum.u.context.ctx = LTTNG_UST_CONTEXT_PROCNAME; | |
57773204 | 436 | ret = ustcomm_send_app_cmd(sock, &lum, &lur); |
8de38cf7 MD |
437 | if (ret) |
438 | return ret; | |
439 | context_handle = lur.ret_val; | |
440 | printf("received context handle %u\n", context_handle); | |
441 | ||
b0a99af4 MD |
442 | /* Get references to channel streams */ |
443 | ret = open_streams(sock, channel_data.handle, | |
444 | stream_data, MAX_NR_STREAMS); | |
445 | if (ret) { | |
446 | printf("Error in open_streams\n"); | |
447 | return ret; | |
448 | } | |
449 | ||
450 | memset(&lum, 0, sizeof(lum)); | |
451 | lum.handle = session_handle; | |
452 | lum.cmd = LTTNG_UST_SESSION_START; | |
57773204 | 453 | ret = ustcomm_send_app_cmd(sock, &lum, &lur); |
b0a99af4 MD |
454 | if (ret) |
455 | return ret; | |
456 | printf("Session handle %u started.\n", session_handle); | |
457 | ||
458 | /* Tell application registration is done */ | |
459 | memset(&lum, 0, sizeof(lum)); | |
460 | lum.handle = LTTNG_UST_ROOT_HANDLE; | |
461 | lum.cmd = LTTNG_UST_REGISTER_DONE; | |
57773204 | 462 | ret = ustcomm_send_app_cmd(sock, &lum, &lur); |
b0a99af4 MD |
463 | if (ret) |
464 | return ret; | |
465 | printf("Registration done acknowledged.\n"); | |
466 | ||
467 | sleep(4); | |
468 | ||
469 | ret = consume_buffers(outputpath); | |
470 | if (ret) { | |
471 | printf("Error in consume_buffers\n"); | |
472 | return ret; | |
473 | } | |
474 | ||
475 | /* Release data channel */ | |
476 | /* Release streams */ | |
477 | ret = close_streams(sock, stream_data, | |
478 | MAX_NR_STREAMS); | |
479 | if (ret) | |
480 | return ret; | |
481 | ||
8de38cf7 MD |
482 | /* Release context */ |
483 | memset(&lum, 0, sizeof(lum)); | |
484 | lum.handle = context_handle; | |
485 | lum.cmd = LTTNG_UST_RELEASE; | |
57773204 | 486 | ret = ustcomm_send_app_cmd(sock, &lum, &lur); |
8de38cf7 MD |
487 | if (ret) |
488 | return ret; | |
489 | ||
b0a99af4 MD |
490 | /* Release events */ |
491 | for (k = 0; k < nr_events; k++) { | |
492 | memset(&lum, 0, sizeof(lum)); | |
493 | lum.handle = event_handle[k]; | |
494 | lum.cmd = LTTNG_UST_RELEASE; | |
57773204 | 495 | ret = ustcomm_send_app_cmd(sock, &lum, &lur); |
b0a99af4 MD |
496 | if (ret) |
497 | return ret; | |
498 | } | |
499 | memset(&lum, 0, sizeof(lum)); | |
500 | lum.handle = channel_data.handle; | |
501 | lum.cmd = LTTNG_UST_RELEASE; | |
57773204 | 502 | ret = ustcomm_send_app_cmd(sock, &lum, &lur); |
b0a99af4 MD |
503 | if (ret) |
504 | return ret; | |
505 | if (channel_data.shm_fd >= 0) { | |
506 | ret = close(channel_data.shm_fd); | |
507 | if (ret) | |
508 | return ret; | |
509 | } | |
510 | if (channel_data.wait_fd >= 0) { | |
511 | ret = close(channel_data.wait_fd); | |
512 | if (ret) | |
513 | return ret; | |
514 | } | |
515 | ||
516 | /* Release metadata channel */ | |
517 | ret = close_streams(sock, &metadata_stream_data, 1); | |
518 | if (ret) | |
519 | return ret; | |
520 | ||
521 | memset(&lum, 0, sizeof(lum)); | |
522 | lum.handle = metadata_data.handle; | |
523 | lum.cmd = LTTNG_UST_RELEASE; | |
57773204 | 524 | ret = ustcomm_send_app_cmd(sock, &lum, &lur); |
b0a99af4 MD |
525 | if (ret) |
526 | return ret; | |
527 | if (metadata_data.shm_fd >= 0) { | |
528 | ret = close(metadata_data.shm_fd); | |
529 | if (ret) | |
530 | return ret; | |
531 | } | |
532 | if (metadata_data.wait_fd >= 0) { | |
533 | ret = close(metadata_data.wait_fd); | |
534 | if (ret) | |
535 | return ret; | |
536 | } | |
537 | ||
538 | /* Release session */ | |
539 | memset(&lum, 0, sizeof(lum)); | |
540 | lum.handle = session_handle; | |
541 | lum.cmd = LTTNG_UST_RELEASE; | |
57773204 | 542 | ret = ustcomm_send_app_cmd(sock, &lum, &lur); |
b0a99af4 MD |
543 | if (ret) |
544 | return ret; | |
545 | ||
546 | return 0; | |
547 | } | |
548 | ||
549 | /* | |
550 | * Using fork to set umask in the child process (not multi-thread safe). We | |
551 | * deal with the shm_open vs ftruncate race (happening when the sessiond owns | |
552 | * the shm and does not let everybody modify it, to ensure safety against | |
553 | * shm_unlink) by simply letting the mmap fail and retrying after a few | |
554 | * seconds. For global shm, everybody has rw access to it until the sessiond | |
555 | * starts. | |
556 | */ | |
557 | static int get_wait_shm(char *shm_path, size_t mmap_size, int global) | |
558 | { | |
559 | int wait_shm_fd, ret; | |
560 | mode_t mode; | |
561 | ||
562 | /* Default permissions */ | |
563 | mode = S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP; | |
564 | ||
565 | /* Change owner of the shm path */ | |
566 | if (global) { | |
567 | ret = chown(shm_path, 0, 0); | |
568 | if (ret < 0) { | |
569 | if (errno != ENOENT) { | |
570 | perror("chown wait shm"); | |
571 | goto error; | |
572 | } | |
573 | } | |
574 | ||
575 | /* | |
576 | * If global session daemon, any application can register so the shm | |
577 | * needs to be set in read-only mode for others. | |
578 | */ | |
579 | mode |= S_IROTH; | |
580 | } else { | |
581 | ret = chown(shm_path, getuid(), getgid()); | |
582 | if (ret < 0) { | |
583 | if (errno != ENOENT) { | |
584 | perror("chown wait shm"); | |
585 | goto error; | |
586 | } | |
587 | } | |
588 | } | |
589 | ||
590 | /* | |
591 | * Set permissions to the shm even if we did not create the shm. | |
592 | */ | |
593 | ret = chmod(shm_path, mode); | |
594 | if (ret < 0) { | |
595 | if (errno != ENOENT) { | |
596 | perror("chmod wait shm"); | |
597 | goto error; | |
598 | } | |
599 | } | |
600 | ||
601 | /* | |
602 | * We're alone in a child process, so we can modify the process-wide | |
603 | * umask. | |
604 | */ | |
605 | umask(~mode); | |
606 | ||
607 | /* | |
608 | * Try creating shm (or get rw access). We don't do an exclusive open, | |
609 | * because we allow other processes to create+ftruncate it concurrently. | |
610 | */ | |
611 | wait_shm_fd = shm_open(shm_path, O_RDWR | O_CREAT, mode); | |
612 | if (wait_shm_fd < 0) { | |
613 | perror("shm_open wait shm"); | |
614 | goto error; | |
615 | } | |
616 | ||
617 | ret = ftruncate(wait_shm_fd, mmap_size); | |
618 | if (ret < 0) { | |
619 | perror("ftruncate wait shm"); | |
620 | exit(EXIT_FAILURE); | |
621 | } | |
622 | ||
623 | ret = fchmod(wait_shm_fd, mode); | |
624 | if (ret < 0) { | |
625 | perror("fchmod"); | |
626 | exit(EXIT_FAILURE); | |
627 | } | |
628 | ||
629 | printf("Got the wait shm fd %d\n", wait_shm_fd); | |
630 | ||
631 | return wait_shm_fd; | |
632 | ||
633 | error: | |
634 | printf("Failing to get the wait shm fd\n"); | |
635 | ||
636 | return -1; | |
637 | } | |
638 | ||
639 | int update_futex(int fd, int active) | |
640 | { | |
641 | size_t mmap_size = sysconf(_SC_PAGE_SIZE); | |
642 | char *wait_shm_mmap; | |
643 | int ret; | |
644 | ||
645 | wait_shm_mmap = mmap(NULL, mmap_size, PROT_READ | PROT_WRITE, | |
646 | MAP_SHARED, fd, 0); | |
647 | if (wait_shm_mmap == MAP_FAILED) { | |
648 | perror("mmap"); | |
649 | goto error; | |
650 | } | |
651 | ||
652 | if (active) { | |
653 | uatomic_set((int32_t *) wait_shm_mmap, 1); | |
654 | futex_async((int32_t *) wait_shm_mmap, FUTEX_WAKE, | |
655 | INT_MAX, NULL, NULL, 0); | |
656 | } else { | |
657 | uatomic_set((int32_t *) wait_shm_mmap, 0); | |
658 | } | |
659 | ret = munmap(wait_shm_mmap, mmap_size); | |
660 | if (ret) { | |
661 | perror("Error unmapping wait shm"); | |
662 | goto error; | |
663 | } | |
664 | return 0; | |
665 | error: | |
666 | return -1; | |
667 | } | |
668 | ||
669 | /* | |
670 | * Set open files limit to unlimited. This daemon can open a large number of | |
671 | * file descriptors in order to consumer multiple kernel traces. | |
672 | */ | |
673 | static void set_ulimit(void) | |
674 | { | |
675 | int ret; | |
676 | struct rlimit lim; | |
677 | ||
678 | /* | |
679 | * If not root, we cannot increase our max open files. But our | |
680 | * scope is then limited to processes from a single user. | |
681 | */ | |
682 | if (getuid() != 0) | |
683 | return; | |
684 | /* The kernel does not allowed an infinite limit for open files */ | |
685 | lim.rlim_cur = 65535; | |
686 | lim.rlim_max = 65535; | |
687 | ||
688 | ret = setrlimit(RLIMIT_NOFILE, &lim); | |
689 | if (ret < 0) { | |
690 | perror("failed to set open files limit"); | |
691 | } | |
692 | } | |
693 | ||
694 | /* | |
695 | * Usage: | |
696 | * ./ust-basic-tracing outputpath event_name1 event_name2 .... | |
697 | */ | |
698 | int main(int argc, const char **argv) | |
699 | { | |
700 | const char *home_dir; | |
701 | int ret, wait_shm_fd; | |
702 | struct sigaction act; | |
fb50c39d | 703 | mode_t old_umask = 0; |
b0a99af4 MD |
704 | const char *outputpath; |
705 | const char **event_names; | |
706 | unsigned int nr_events; | |
707 | ||
708 | if (argc < 2) { | |
709 | printf("Usage:\n"); | |
710 | printf("%s outputpath event_name1 event_name2 ...\n", | |
711 | argv[0]); | |
712 | exit(-1); | |
713 | } | |
714 | outputpath = argv[1]; | |
715 | event_names = &argv[2]; | |
716 | nr_events = argc - 2; | |
717 | ||
718 | set_ulimit(); | |
719 | ||
720 | /* Ignore sigpipe */ | |
721 | memset(&act, 0, sizeof(act)); | |
722 | ret = sigemptyset(&act.sa_mask); | |
723 | if (ret == -1) { | |
724 | perror("sigemptyset"); | |
725 | return -1; | |
726 | } | |
727 | ||
728 | act.sa_handler = SIG_IGN; | |
729 | ret = sigaction(SIGPIPE, &act, NULL); | |
730 | if (ret == -1) { | |
731 | perror("sigaction"); | |
732 | return -1; | |
733 | } | |
734 | ||
735 | /* Handle SIGTERM */ | |
736 | act.sa_handler = handle_signals; | |
737 | ret = sigaction(SIGTERM, &act, NULL); | |
738 | if (ret == -1) { | |
739 | perror("sigaction"); | |
740 | return -1; | |
741 | } | |
742 | /* Handle SIGINT */ | |
743 | ret = sigaction(SIGINT, &act, NULL); | |
744 | if (ret == -1) { | |
745 | perror("sigaction"); | |
746 | return -1; | |
747 | } | |
748 | ||
749 | if (geteuid() == 0) { | |
750 | ret = mkdir(LTTNG_RUNDIR, S_IRWXU | S_IRWXG | S_IROTH | S_IXOTH); | |
751 | if (ret && errno != EEXIST) { | |
752 | perror("mkdir"); | |
753 | return -1; | |
754 | } | |
755 | wait_shm_fd = get_wait_shm(DEFAULT_GLOBAL_APPS_WAIT_SHM_PATH, | |
756 | sysconf(_SC_PAGE_SIZE), 1); | |
757 | if (wait_shm_fd < 0) { | |
758 | perror("global wait shm error"); | |
759 | return -1; | |
760 | } | |
761 | strcpy(apps_sock_path, DEFAULT_GLOBAL_APPS_UNIX_SOCK); | |
762 | old_umask = umask(0); | |
763 | } else { | |
764 | snprintf(local_apps_wait_shm_path, PATH_MAX, | |
765 | DEFAULT_HOME_APPS_WAIT_SHM_PATH, getuid()); | |
766 | wait_shm_fd = get_wait_shm(local_apps_wait_shm_path, | |
767 | sysconf(_SC_PAGE_SIZE), 0); | |
768 | if (wait_shm_fd < 0) { | |
769 | perror("local wait shm error"); | |
770 | return -1; | |
771 | } | |
772 | home_dir = (const char *) getenv("HOME"); | |
773 | if (!home_dir) { | |
774 | perror("getenv error"); | |
775 | return -ENOENT; | |
776 | } | |
777 | snprintf(apps_sock_path, PATH_MAX, | |
778 | DEFAULT_HOME_APPS_UNIX_SOCK, home_dir); | |
779 | } | |
780 | ||
57773204 | 781 | ret = ustcomm_create_unix_sock(apps_sock_path); |
b0a99af4 MD |
782 | if (ret < 0) { |
783 | perror("create error"); | |
784 | return ret; | |
785 | } | |
786 | apps_socket = ret; | |
787 | ||
788 | if (getuid() == 0) { | |
789 | /* File permission MUST be 666 */ | |
790 | ret = chmod(apps_sock_path, | |
791 | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH); | |
792 | if (ret < 0) { | |
793 | printf("Set file permissions failed: %s\n", apps_sock_path); | |
794 | perror("chmod"); | |
795 | goto end; | |
796 | } | |
797 | umask(old_umask); | |
798 | } | |
57773204 | 799 | ret = ustcomm_listen_unix_sock(apps_socket); |
b0a99af4 MD |
800 | if (ret < 0) { |
801 | perror("listen error"); | |
802 | return ret; | |
803 | } | |
804 | ||
805 | /* wake up futexes */ | |
806 | ret = update_futex(wait_shm_fd, 1); | |
807 | if (ret) { | |
808 | fprintf(stderr, "Error wakeup futex\n"); | |
809 | return -1; | |
810 | } | |
811 | ||
812 | for (;;) { | |
813 | int sock; | |
814 | ssize_t len; | |
815 | struct { | |
816 | uint32_t major; | |
817 | uint32_t minor; | |
818 | pid_t pid; | |
819 | pid_t ppid; | |
820 | uid_t uid; | |
821 | gid_t gid; | |
822 | char name[16]; /* Process name */ | |
823 | } reg_msg; | |
824 | char bufname[17]; | |
825 | ||
826 | if (quit_program) | |
827 | break; | |
828 | ||
829 | printf("Accepting application registration\n"); | |
57773204 | 830 | sock = ustcomm_accept_unix_sock(apps_socket); |
b0a99af4 MD |
831 | if (sock < 0) { |
832 | perror("accept error"); | |
833 | goto end; | |
834 | } | |
835 | ||
836 | /* | |
837 | * Basic recv here to handle the very simple data | |
838 | * that the libust send to register (reg_msg). | |
839 | */ | |
57773204 | 840 | len = ustcomm_recv_unix_sock(sock, ®_msg, sizeof(reg_msg)); |
b0a99af4 | 841 | if (len < 0 || len != sizeof(reg_msg)) { |
57773204 | 842 | perror("ustcomm_recv_unix_sock"); |
b0a99af4 MD |
843 | continue; |
844 | } | |
845 | memcpy(bufname, reg_msg.name, 16); | |
846 | bufname[16] = '\0'; | |
847 | printf("Application %s pid %u ppid %u uid %u gid %u has registered (version : %u.%u)\n", | |
848 | bufname, reg_msg.pid, reg_msg.ppid, reg_msg.uid, | |
849 | reg_msg.gid, reg_msg.major, reg_msg.minor); | |
850 | ret = send_app_msgs(sock, outputpath, nr_events, event_names); | |
851 | if (ret) { | |
852 | printf("Error in send_app_msgs.\n"); | |
853 | sleep(1); | |
854 | } | |
855 | close(sock); | |
856 | } | |
857 | ||
858 | end: | |
859 | printf("quitting.\n"); | |
860 | /* Let applications know we are not responding anymore */ | |
861 | ret = update_futex(wait_shm_fd, 0); | |
862 | if (ret) { | |
863 | fprintf(stderr, "Error wakeup futex\n"); | |
864 | return -1; | |
865 | } | |
866 | ||
867 | return 0; | |
868 | } |