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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 | |
22 | #include <errno.h> | |
23 | #include <stdio.h> | |
24 | #include <stdlib.h> | |
25 | #include <string.h> | |
26 | #include <signal.h> | |
27 | #include <unistd.h> | |
28 | #include <sys/wait.h> | |
29 | #include <sys/types.h> | |
30 | #include <sys/stat.h> | |
31 | #include <fcntl.h> | |
32 | #include <sys/mman.h> | |
33 | #include <limits.h> | |
34 | #include <urcu/futex.h> | |
35 | #include <urcu/uatomic.h> | |
36 | #include <assert.h> | |
37 | #include <sys/socket.h> | |
38 | ||
39 | #include "lttng-ust-comm.h" | |
40 | #include "../../libringbuffer/backend.h" | |
41 | #include "../../libringbuffer/frontend.h" | |
42 | ||
43 | #define MAX_NR_STREAMS 64 | |
44 | #define MAX_NR_EVENTS 128 | |
45 | ||
46 | struct object_data { | |
47 | int handle; | |
48 | int shm_fd; | |
49 | int wait_fd; | |
50 | uint64_t memory_map_size; | |
51 | }; | |
52 | ||
53 | static int session_handle; | |
54 | static struct object_data metadata_stream_data; | |
55 | static struct object_data metadata_data; | |
56 | static struct object_data channel_data; | |
57 | static struct object_data stream_data[MAX_NR_STREAMS]; | |
58 | static int event_handle[MAX_NR_EVENTS]; | |
8de38cf7 | 59 | static int context_handle; |
b0a99af4 MD |
60 | |
61 | static int apps_socket = -1; | |
62 | static char apps_sock_path[PATH_MAX]; | |
63 | static char local_apps_wait_shm_path[PATH_MAX]; | |
64 | ||
65 | static volatile int quit_program; | |
66 | ||
67 | static void handle_signals(int signo) | |
68 | { | |
69 | quit_program = 1; | |
70 | } | |
71 | ||
72 | static int send_app_msg(int sock, struct lttcomm_ust_msg *lum) | |
73 | { | |
74 | ssize_t len; | |
75 | ||
76 | len = lttcomm_send_unix_sock(sock, lum, sizeof(*lum)); | |
77 | switch (len) { | |
78 | case sizeof(*lum): | |
79 | printf("message successfully sent\n"); | |
80 | break; | |
81 | case -1: | |
82 | if (errno == ECONNRESET) { | |
83 | printf("remote end closed connection\n"); | |
84 | return 0; | |
85 | } | |
86 | return -1; | |
87 | default: | |
88 | printf("incorrect message size: %zd\n", len); | |
89 | return -1; | |
90 | } | |
91 | return 0; | |
92 | } | |
93 | ||
94 | static int recv_app_reply(int sock, struct lttcomm_ust_reply *lur, | |
95 | uint32_t expected_handle, uint32_t expected_cmd) | |
96 | { | |
97 | ssize_t len; | |
98 | ||
99 | memset(lur, 0, sizeof(*lur)); | |
100 | len = lttcomm_recv_unix_sock(sock, lur, sizeof(*lur)); | |
101 | switch (len) { | |
102 | case 0: /* orderly shutdown */ | |
103 | printf("Application has performed an orderly shutdown\n"); | |
104 | return -EINVAL; | |
105 | case sizeof(*lur): | |
106 | printf("result message received\n"); | |
107 | if (lur->handle != expected_handle) { | |
108 | printf("Unexpected result message handle\n"); | |
109 | return -EINVAL; | |
110 | } | |
111 | ||
112 | if (lur->cmd != expected_cmd) { | |
113 | printf("Unexpected result message command\n"); | |
114 | return -EINVAL; | |
115 | } | |
116 | if (lur->ret_code != LTTCOMM_OK) { | |
117 | printf("remote operation failed with code %d.\n", | |
118 | lur->ret_code); | |
119 | return lur->ret_code; | |
120 | } | |
121 | return 0; | |
122 | case -1: | |
123 | if (errno == ECONNRESET) { | |
124 | printf("remote end closed connection\n"); | |
125 | return -EINVAL; | |
126 | } | |
127 | return -1; | |
128 | default: | |
129 | printf("incorrect message size: %zd\n", len); | |
130 | return len > 0 ? -1 : len; | |
131 | } | |
132 | } | |
133 | ||
134 | static int send_app_cmd(int sock, | |
135 | struct lttcomm_ust_msg *lum, | |
136 | struct lttcomm_ust_reply *lur) | |
137 | { | |
138 | int ret; | |
139 | ||
140 | ret = send_app_msg(sock, lum); | |
141 | if (ret) | |
142 | return ret; | |
143 | ret = recv_app_reply(sock, lur, lum->handle, lum->cmd); | |
144 | if (ret) | |
145 | return ret; | |
146 | return 0; | |
147 | } | |
148 | ||
149 | ||
150 | /* | |
151 | * Receives a single fd from socket. | |
152 | * | |
153 | * Returns the size of received data | |
154 | */ | |
155 | static int lttcomm_recv_fd(int sock) | |
156 | { | |
157 | struct iovec iov[1]; | |
158 | int ret = 0; | |
159 | int data_fd; | |
160 | struct cmsghdr *cmsg; | |
161 | char recv_fd[CMSG_SPACE(sizeof(int))]; | |
162 | struct msghdr msg = { 0 }; | |
af327df1 MD |
163 | union { |
164 | unsigned char vc[4]; | |
165 | int vi; | |
166 | } tmp; | |
167 | int i; | |
b0a99af4 MD |
168 | |
169 | /* Prepare to receive the structures */ | |
170 | iov[0].iov_base = &data_fd; | |
171 | iov[0].iov_len = sizeof(data_fd); | |
172 | msg.msg_iov = iov; | |
173 | msg.msg_iovlen = 1; | |
174 | msg.msg_control = recv_fd; | |
175 | msg.msg_controllen = sizeof(recv_fd); | |
176 | ||
177 | printf("Waiting to receive fd\n"); | |
178 | if ((ret = recvmsg(sock, &msg, 0)) < 0) { | |
179 | perror("recvmsg"); | |
180 | goto end; | |
181 | } | |
182 | if (ret != sizeof(data_fd)) { | |
183 | printf("Received %d bytes, expected %ld", ret, sizeof(data_fd)); | |
184 | goto end; | |
185 | } | |
186 | cmsg = CMSG_FIRSTHDR(&msg); | |
187 | if (!cmsg) { | |
188 | printf("Invalid control message header\n"); | |
189 | ret = -1; | |
190 | goto end; | |
191 | } | |
192 | if (cmsg->cmsg_level != SOL_SOCKET || cmsg->cmsg_type != SCM_RIGHTS) { | |
193 | printf("Didn't received any fd\n"); | |
194 | ret = -1; | |
195 | goto end; | |
196 | } | |
197 | /* this is our fd */ | |
af327df1 | 198 | for (i = 0; i < sizeof(int); i++) |
aca7316c | 199 | tmp.vc[i] = CMSG_DATA(cmsg)[i]; |
af327df1 | 200 | ret = tmp.vi; |
b0a99af4 MD |
201 | printf("received fd %d\n", ret); |
202 | end: | |
203 | return ret; | |
204 | } | |
205 | ||
206 | ||
207 | static | |
208 | int open_streams(int sock, int channel_handle, struct object_data *stream_datas, | |
209 | int nr_check) | |
210 | { | |
211 | int ret, k = 0; | |
212 | ||
213 | for (;;) { | |
214 | struct lttcomm_ust_msg lum; | |
215 | struct lttcomm_ust_reply lur; | |
216 | ||
217 | memset(&lum, 0, sizeof(lum)); | |
218 | lum.handle = channel_handle; | |
219 | lum.cmd = LTTNG_UST_STREAM; | |
220 | ret = send_app_cmd(sock, &lum, &lur); | |
221 | if (!ret) { | |
222 | assert(k < nr_check); | |
223 | stream_datas[k].handle = lur.ret_val; | |
224 | printf("received stream handle %u\n", | |
225 | stream_datas[k].handle); | |
226 | if (lur.ret_code == LTTCOMM_OK) { | |
227 | ssize_t len; | |
228 | ||
229 | stream_datas[k].memory_map_size = lur.u.stream.memory_map_size; | |
230 | /* get shm fd */ | |
231 | len = lttcomm_recv_fd(sock); | |
232 | if (len < 0) | |
233 | return -EINVAL; | |
234 | stream_datas[k].shm_fd = len; | |
235 | /* get wait fd */ | |
236 | len = lttcomm_recv_fd(sock); | |
237 | if (len < 0) | |
238 | return -EINVAL; | |
239 | stream_datas[k].wait_fd = len; | |
240 | } | |
241 | k++; | |
242 | } | |
243 | if (ret == -ENOENT) | |
244 | break; | |
245 | if (ret) | |
246 | return ret; | |
247 | } | |
248 | return 0; | |
249 | } | |
250 | ||
251 | static | |
252 | int close_streams(int sock, struct object_data *stream_datas, int nr_check) | |
253 | { | |
254 | int ret, k; | |
255 | ||
256 | for (k = 0; k < nr_check; k++) { | |
257 | struct lttcomm_ust_msg lum; | |
258 | struct lttcomm_ust_reply lur; | |
259 | ||
260 | if (!stream_datas[k].handle) | |
261 | continue; | |
262 | memset(&lum, 0, sizeof(lum)); | |
263 | lum.handle = stream_datas[k].handle; | |
264 | lum.cmd = LTTNG_UST_RELEASE; | |
265 | ret = send_app_cmd(sock, &lum, &lur); | |
266 | if (ret) { | |
267 | printf("Error closing stream\n"); | |
268 | return ret; | |
269 | } | |
270 | if (stream_datas[k].shm_fd >= 0) { | |
271 | ret = close(stream_datas[k].shm_fd); | |
272 | if (ret) { | |
273 | printf("Error closing stream shm_fd\n"); | |
274 | return ret; | |
275 | } | |
276 | } | |
277 | if (stream_datas[k].wait_fd >= 0) { | |
278 | ret = close(stream_datas[k].wait_fd); | |
279 | if (ret) { | |
280 | printf("Error closing stream wait_fd\n"); | |
281 | return ret; | |
282 | } | |
283 | } | |
284 | } | |
285 | return 0; | |
286 | } | |
287 | ||
288 | static | |
289 | struct shm_handle *map_channel(struct object_data *chan_data, | |
290 | struct object_data *stream_datas, int nr_check) | |
291 | { | |
292 | struct shm_handle *handle; | |
293 | struct channel *chan; | |
294 | int k, ret; | |
295 | ||
296 | /* map metadata channel */ | |
297 | handle = channel_handle_create(chan_data->shm_fd, | |
298 | chan_data->wait_fd, | |
299 | chan_data->memory_map_size); | |
300 | if (!handle) { | |
301 | printf("create handle error\n"); | |
302 | return NULL; | |
303 | } | |
304 | chan_data->shm_fd = -1; | |
305 | chan_data->wait_fd = -1; | |
306 | chan = shmp(handle, handle->chan); | |
307 | ||
308 | for (k = 0; k < nr_check; k++) { | |
309 | struct object_data *stream_data = &stream_datas[k]; | |
310 | ||
311 | if (!stream_data->handle) | |
312 | break; | |
313 | /* map stream */ | |
314 | ret = channel_handle_add_stream(handle, | |
315 | stream_data->shm_fd, | |
316 | stream_data->wait_fd, | |
317 | stream_data->memory_map_size); | |
318 | if (ret) { | |
319 | printf("add stream error\n"); | |
320 | goto error_destroy; | |
321 | } | |
322 | stream_data->shm_fd = -1; | |
323 | stream_data->wait_fd = -1; | |
324 | } | |
325 | return handle; | |
326 | ||
327 | error_destroy: | |
328 | channel_destroy(chan, handle, 1); | |
329 | return NULL; | |
330 | } | |
331 | ||
332 | static | |
333 | void unmap_channel(struct shm_handle *handle) | |
334 | { | |
335 | struct channel *chan; | |
336 | ||
337 | chan = shmp(handle, handle->chan); | |
338 | /* unmap channel */ | |
339 | channel_destroy(chan, handle, 1); | |
340 | } | |
341 | ||
342 | static | |
343 | int consume_stream(struct shm_handle *handle, int cpu, char *outfile) | |
344 | { | |
345 | struct channel *chan; | |
346 | struct lib_ring_buffer *buf; | |
347 | int outfd, ret; | |
348 | int shm_fd, wait_fd; | |
349 | uint64_t memory_map_size; | |
350 | ||
351 | chan = shmp(handle, handle->chan); | |
352 | ||
353 | /* open stream */ | |
354 | buf = channel_get_ring_buffer(&chan->backend.config, | |
355 | chan, cpu, handle, &shm_fd, &wait_fd, &memory_map_size); | |
356 | if (!buf) | |
357 | return -ENOENT; | |
358 | ret = lib_ring_buffer_open_read(buf, handle, 1); | |
359 | if (ret) { | |
360 | return -1; | |
361 | } | |
362 | ||
363 | /* copy */ | |
364 | outfd = open(outfile, O_WRONLY | O_CREAT | O_LARGEFILE | O_TRUNC, | |
365 | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); | |
366 | if (outfd < 0) { | |
367 | perror("open output"); | |
368 | return -1; | |
369 | } | |
370 | ||
371 | printf("Waiting for buffer data for %s\n", outfile); | |
372 | for (;;) { | |
373 | unsigned long read_size; | |
374 | unsigned long copy_size; | |
375 | char *ptr; | |
376 | ||
377 | ret = lib_ring_buffer_get_next_subbuf(buf, handle); | |
378 | printf("get next ret %d\n", ret); | |
379 | if (ret == -ENODATA) | |
380 | break; | |
381 | if (ret == -EAGAIN) { | |
382 | sleep(1); | |
383 | continue; | |
384 | } | |
385 | if (ret) { | |
386 | printf("Error %d in lib_ring_buffer_get_next_subbuf\n", ret); | |
387 | return -1; | |
388 | } | |
389 | read_size = lib_ring_buffer_get_read_data_size( | |
390 | &chan->backend.config, buf, handle); | |
391 | read_size = PAGE_ALIGN(read_size); | |
392 | ptr = lib_ring_buffer_read_offset_address( | |
393 | &buf->backend, 0, handle); | |
394 | printf("WRITE: copy %lu bytes\n", read_size); | |
395 | copy_size = write(outfd, ptr, read_size); | |
396 | if (copy_size < read_size) { | |
397 | printf("write issue: copied %zd, expected %lu\n", copy_size, read_size); | |
398 | } | |
399 | lib_ring_buffer_put_next_subbuf(buf, handle); | |
400 | } | |
401 | ||
402 | ret = close(outfd); | |
403 | if (ret) { | |
404 | perror("close"); | |
405 | return -1; | |
406 | } | |
407 | ||
408 | /* close stream */ | |
409 | lib_ring_buffer_release_read(buf, handle, 1); | |
410 | return 0; | |
411 | } | |
412 | ||
413 | static | |
414 | int consume_buffers(const char *outputpath) | |
415 | { | |
416 | int k, ret; | |
417 | mode_t old_umask; | |
418 | char pathname[PATH_MAX]; | |
419 | struct shm_handle *handle; | |
420 | ||
421 | snprintf(pathname, PATH_MAX - 1, "%s", outputpath); | |
422 | old_umask = umask(0); | |
423 | ret = mkdir(pathname, S_IRWXU | S_IRWXG); | |
424 | if (ret && errno != EEXIST) { | |
425 | perror("mkdir"); | |
426 | umask(old_umask); | |
427 | return -1; | |
428 | } | |
429 | umask(old_umask); | |
430 | ||
431 | /* copy metadata */ | |
432 | handle = map_channel(&metadata_data, | |
433 | &metadata_stream_data, 1); | |
434 | if (!handle) | |
435 | return -1; | |
436 | snprintf(pathname, PATH_MAX - 1, | |
437 | "%s/metadata", outputpath); | |
438 | ret = consume_stream(handle, -1, pathname); | |
439 | if (ret && ret != -ENOENT) { | |
440 | printf("Error in consume_stream\n"); | |
441 | return ret; | |
442 | } | |
443 | unmap_channel(handle); | |
444 | ||
445 | /* copy binary data */ | |
446 | handle = map_channel(&channel_data, | |
447 | stream_data, MAX_NR_STREAMS); | |
448 | if (!handle) | |
449 | return -1; | |
450 | for (k = 0; k < MAX_NR_STREAMS; k++) { | |
451 | snprintf(pathname, PATH_MAX - 1, | |
452 | "%s/data_%u", outputpath, k); | |
453 | ret = consume_stream(handle, k, pathname); | |
454 | if (ret && ret != -ENOENT) { | |
455 | printf("Error in consume_stream\n"); | |
456 | return ret; | |
457 | } | |
458 | } | |
459 | unmap_channel(handle); | |
460 | ||
461 | return 0; | |
462 | } | |
463 | ||
464 | int send_app_msgs(int sock, const char *outputpath, | |
465 | unsigned int nr_events, const char **event_names) | |
466 | { | |
467 | struct lttcomm_ust_msg lum; | |
468 | struct lttcomm_ust_reply lur; | |
469 | int ret, k; | |
470 | ||
471 | /* Create session */ | |
472 | memset(&lum, 0, sizeof(lum)); | |
473 | lum.handle = LTTNG_UST_ROOT_HANDLE; | |
474 | lum.cmd = LTTNG_UST_SESSION; | |
475 | ret = send_app_cmd(sock, &lum, &lur); | |
476 | if (ret) | |
477 | return ret; | |
478 | session_handle = lur.ret_val; | |
479 | printf("received session handle %u\n", session_handle); | |
480 | ||
481 | /* Create metadata channel */ | |
482 | memset(&lum, 0, sizeof(lum)); | |
483 | lum.handle = session_handle; | |
484 | lum.cmd = LTTNG_UST_METADATA; | |
485 | lum.u.channel.overwrite = 0; | |
486 | lum.u.channel.subbuf_size = 32768; | |
487 | lum.u.channel.num_subbuf = 4; | |
488 | lum.u.channel.switch_timer_interval = 0; | |
489 | lum.u.channel.read_timer_interval = 0; | |
490 | lum.u.channel.output = LTTNG_UST_MMAP; | |
491 | ret = send_app_cmd(sock, &lum, &lur); | |
492 | if (ret) | |
493 | return ret; | |
494 | metadata_data.handle = lur.ret_val; | |
495 | printf("received metadata handle %u\n", metadata_data.handle); | |
496 | if (lur.ret_code == LTTCOMM_OK) { | |
497 | ssize_t len; | |
498 | ||
499 | metadata_data.memory_map_size = lur.u.channel.memory_map_size; | |
500 | /* get shm fd */ | |
501 | len = lttcomm_recv_fd(sock); | |
502 | if (len < 0) | |
503 | return -EINVAL; | |
504 | metadata_data.shm_fd = len; | |
505 | /* get wait fd */ | |
506 | len = lttcomm_recv_fd(sock); | |
507 | if (len < 0) | |
508 | return -EINVAL; | |
509 | metadata_data.wait_fd = len; | |
510 | } | |
511 | ||
512 | ret = open_streams(sock, metadata_data.handle, | |
513 | &metadata_stream_data, 1); | |
514 | if (ret) { | |
515 | printf("Error in open_streams\n"); | |
516 | return ret; | |
517 | } | |
518 | ||
519 | /* Create data channel */ | |
520 | memset(&lum, 0, sizeof(lum)); | |
521 | lum.handle = session_handle; | |
522 | lum.cmd = LTTNG_UST_CHANNEL; | |
523 | //lum.u.channel.overwrite = 0; | |
524 | lum.u.channel.overwrite = 1; | |
525 | lum.u.channel.subbuf_size = 32768; | |
526 | lum.u.channel.num_subbuf = 8; | |
527 | //lum.u.channel.num_subbuf = 4; | |
528 | //lum.u.channel.num_subbuf = 2; | |
529 | lum.u.channel.switch_timer_interval = 0; | |
530 | lum.u.channel.read_timer_interval = 0; | |
531 | lum.u.channel.output = LTTNG_UST_MMAP; | |
532 | ret = send_app_cmd(sock, &lum, &lur); | |
533 | if (ret) | |
534 | return ret; | |
535 | channel_data.handle = lur.ret_val; | |
536 | printf("received channel handle %u\n", channel_data.handle); | |
537 | if (lur.ret_code == LTTCOMM_OK) { | |
538 | ssize_t len; | |
539 | ||
540 | channel_data.memory_map_size = lur.u.channel.memory_map_size; | |
541 | /* get shm fd */ | |
542 | len = lttcomm_recv_fd(sock); | |
543 | if (len < 0) | |
544 | return -EINVAL; | |
545 | channel_data.shm_fd = len; | |
546 | /* get wait fd */ | |
547 | len = lttcomm_recv_fd(sock); | |
548 | if (len < 0) | |
549 | return -EINVAL; | |
550 | channel_data.wait_fd = len; | |
551 | } | |
552 | ||
553 | /* Create events */ | |
554 | for (k = 0; k < nr_events; k++) { | |
555 | memset(&lum, 0, sizeof(lum)); | |
556 | lum.handle = channel_data.handle; | |
557 | lum.cmd = LTTNG_UST_EVENT; | |
558 | strncpy(lum.u.event.name, event_names[k], | |
559 | LTTNG_UST_SYM_NAME_LEN); | |
560 | lum.u.event.instrumentation = LTTNG_UST_TRACEPOINT; | |
561 | ret = send_app_cmd(sock, &lum, &lur); | |
562 | if (ret) | |
563 | return ret; | |
564 | event_handle[k] = lur.ret_val; | |
565 | printf("received event handle %u\n", event_handle[k]); | |
566 | } | |
567 | ||
8de38cf7 MD |
568 | /* Attach pthread_id context */ |
569 | memset(&lum, 0, sizeof(lum)); | |
570 | lum.handle = channel_data.handle; | |
571 | lum.cmd = LTTNG_UST_CONTEXT; | |
572 | lum.u.context.ctx = LTTNG_UST_CONTEXT_PTHREAD_ID; | |
573 | ret = send_app_cmd(sock, &lum, &lur); | |
574 | if (ret) | |
575 | return ret; | |
576 | context_handle = lur.ret_val; | |
577 | printf("received context handle %u\n", context_handle); | |
578 | ||
b0a99af4 MD |
579 | /* Get references to channel streams */ |
580 | ret = open_streams(sock, channel_data.handle, | |
581 | stream_data, MAX_NR_STREAMS); | |
582 | if (ret) { | |
583 | printf("Error in open_streams\n"); | |
584 | return ret; | |
585 | } | |
586 | ||
587 | memset(&lum, 0, sizeof(lum)); | |
588 | lum.handle = session_handle; | |
589 | lum.cmd = LTTNG_UST_SESSION_START; | |
590 | ret = send_app_cmd(sock, &lum, &lur); | |
591 | if (ret) | |
592 | return ret; | |
593 | printf("Session handle %u started.\n", session_handle); | |
594 | ||
595 | /* Tell application registration is done */ | |
596 | memset(&lum, 0, sizeof(lum)); | |
597 | lum.handle = LTTNG_UST_ROOT_HANDLE; | |
598 | lum.cmd = LTTNG_UST_REGISTER_DONE; | |
599 | ret = send_app_cmd(sock, &lum, &lur); | |
600 | if (ret) | |
601 | return ret; | |
602 | printf("Registration done acknowledged.\n"); | |
603 | ||
604 | sleep(4); | |
605 | ||
606 | ret = consume_buffers(outputpath); | |
607 | if (ret) { | |
608 | printf("Error in consume_buffers\n"); | |
609 | return ret; | |
610 | } | |
611 | ||
612 | /* Release data channel */ | |
613 | /* Release streams */ | |
614 | ret = close_streams(sock, stream_data, | |
615 | MAX_NR_STREAMS); | |
616 | if (ret) | |
617 | return ret; | |
618 | ||
8de38cf7 MD |
619 | /* Release context */ |
620 | memset(&lum, 0, sizeof(lum)); | |
621 | lum.handle = context_handle; | |
622 | lum.cmd = LTTNG_UST_RELEASE; | |
623 | ret = send_app_cmd(sock, &lum, &lur); | |
624 | if (ret) | |
625 | return ret; | |
626 | ||
b0a99af4 MD |
627 | /* Release events */ |
628 | for (k = 0; k < nr_events; k++) { | |
629 | memset(&lum, 0, sizeof(lum)); | |
630 | lum.handle = event_handle[k]; | |
631 | lum.cmd = LTTNG_UST_RELEASE; | |
632 | ret = send_app_cmd(sock, &lum, &lur); | |
633 | if (ret) | |
634 | return ret; | |
635 | } | |
636 | memset(&lum, 0, sizeof(lum)); | |
637 | lum.handle = channel_data.handle; | |
638 | lum.cmd = LTTNG_UST_RELEASE; | |
639 | ret = send_app_cmd(sock, &lum, &lur); | |
640 | if (ret) | |
641 | return ret; | |
642 | if (channel_data.shm_fd >= 0) { | |
643 | ret = close(channel_data.shm_fd); | |
644 | if (ret) | |
645 | return ret; | |
646 | } | |
647 | if (channel_data.wait_fd >= 0) { | |
648 | ret = close(channel_data.wait_fd); | |
649 | if (ret) | |
650 | return ret; | |
651 | } | |
652 | ||
653 | /* Release metadata channel */ | |
654 | ret = close_streams(sock, &metadata_stream_data, 1); | |
655 | if (ret) | |
656 | return ret; | |
657 | ||
658 | memset(&lum, 0, sizeof(lum)); | |
659 | lum.handle = metadata_data.handle; | |
660 | lum.cmd = LTTNG_UST_RELEASE; | |
661 | ret = send_app_cmd(sock, &lum, &lur); | |
662 | if (ret) | |
663 | return ret; | |
664 | if (metadata_data.shm_fd >= 0) { | |
665 | ret = close(metadata_data.shm_fd); | |
666 | if (ret) | |
667 | return ret; | |
668 | } | |
669 | if (metadata_data.wait_fd >= 0) { | |
670 | ret = close(metadata_data.wait_fd); | |
671 | if (ret) | |
672 | return ret; | |
673 | } | |
674 | ||
675 | /* Release session */ | |
676 | memset(&lum, 0, sizeof(lum)); | |
677 | lum.handle = session_handle; | |
678 | lum.cmd = LTTNG_UST_RELEASE; | |
679 | ret = send_app_cmd(sock, &lum, &lur); | |
680 | if (ret) | |
681 | return ret; | |
682 | ||
683 | return 0; | |
684 | } | |
685 | ||
686 | /* | |
687 | * Using fork to set umask in the child process (not multi-thread safe). We | |
688 | * deal with the shm_open vs ftruncate race (happening when the sessiond owns | |
689 | * the shm and does not let everybody modify it, to ensure safety against | |
690 | * shm_unlink) by simply letting the mmap fail and retrying after a few | |
691 | * seconds. For global shm, everybody has rw access to it until the sessiond | |
692 | * starts. | |
693 | */ | |
694 | static int get_wait_shm(char *shm_path, size_t mmap_size, int global) | |
695 | { | |
696 | int wait_shm_fd, ret; | |
697 | mode_t mode; | |
698 | ||
699 | /* Default permissions */ | |
700 | mode = S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP; | |
701 | ||
702 | /* Change owner of the shm path */ | |
703 | if (global) { | |
704 | ret = chown(shm_path, 0, 0); | |
705 | if (ret < 0) { | |
706 | if (errno != ENOENT) { | |
707 | perror("chown wait shm"); | |
708 | goto error; | |
709 | } | |
710 | } | |
711 | ||
712 | /* | |
713 | * If global session daemon, any application can register so the shm | |
714 | * needs to be set in read-only mode for others. | |
715 | */ | |
716 | mode |= S_IROTH; | |
717 | } else { | |
718 | ret = chown(shm_path, getuid(), getgid()); | |
719 | if (ret < 0) { | |
720 | if (errno != ENOENT) { | |
721 | perror("chown wait shm"); | |
722 | goto error; | |
723 | } | |
724 | } | |
725 | } | |
726 | ||
727 | /* | |
728 | * Set permissions to the shm even if we did not create the shm. | |
729 | */ | |
730 | ret = chmod(shm_path, mode); | |
731 | if (ret < 0) { | |
732 | if (errno != ENOENT) { | |
733 | perror("chmod wait shm"); | |
734 | goto error; | |
735 | } | |
736 | } | |
737 | ||
738 | /* | |
739 | * We're alone in a child process, so we can modify the process-wide | |
740 | * umask. | |
741 | */ | |
742 | umask(~mode); | |
743 | ||
744 | /* | |
745 | * Try creating shm (or get rw access). We don't do an exclusive open, | |
746 | * because we allow other processes to create+ftruncate it concurrently. | |
747 | */ | |
748 | wait_shm_fd = shm_open(shm_path, O_RDWR | O_CREAT, mode); | |
749 | if (wait_shm_fd < 0) { | |
750 | perror("shm_open wait shm"); | |
751 | goto error; | |
752 | } | |
753 | ||
754 | ret = ftruncate(wait_shm_fd, mmap_size); | |
755 | if (ret < 0) { | |
756 | perror("ftruncate wait shm"); | |
757 | exit(EXIT_FAILURE); | |
758 | } | |
759 | ||
760 | ret = fchmod(wait_shm_fd, mode); | |
761 | if (ret < 0) { | |
762 | perror("fchmod"); | |
763 | exit(EXIT_FAILURE); | |
764 | } | |
765 | ||
766 | printf("Got the wait shm fd %d\n", wait_shm_fd); | |
767 | ||
768 | return wait_shm_fd; | |
769 | ||
770 | error: | |
771 | printf("Failing to get the wait shm fd\n"); | |
772 | ||
773 | return -1; | |
774 | } | |
775 | ||
776 | int update_futex(int fd, int active) | |
777 | { | |
778 | size_t mmap_size = sysconf(_SC_PAGE_SIZE); | |
779 | char *wait_shm_mmap; | |
780 | int ret; | |
781 | ||
782 | wait_shm_mmap = mmap(NULL, mmap_size, PROT_READ | PROT_WRITE, | |
783 | MAP_SHARED, fd, 0); | |
784 | if (wait_shm_mmap == MAP_FAILED) { | |
785 | perror("mmap"); | |
786 | goto error; | |
787 | } | |
788 | ||
789 | if (active) { | |
790 | uatomic_set((int32_t *) wait_shm_mmap, 1); | |
791 | futex_async((int32_t *) wait_shm_mmap, FUTEX_WAKE, | |
792 | INT_MAX, NULL, NULL, 0); | |
793 | } else { | |
794 | uatomic_set((int32_t *) wait_shm_mmap, 0); | |
795 | } | |
796 | ret = munmap(wait_shm_mmap, mmap_size); | |
797 | if (ret) { | |
798 | perror("Error unmapping wait shm"); | |
799 | goto error; | |
800 | } | |
801 | return 0; | |
802 | error: | |
803 | return -1; | |
804 | } | |
805 | ||
806 | /* | |
807 | * Set open files limit to unlimited. This daemon can open a large number of | |
808 | * file descriptors in order to consumer multiple kernel traces. | |
809 | */ | |
810 | static void set_ulimit(void) | |
811 | { | |
812 | int ret; | |
813 | struct rlimit lim; | |
814 | ||
815 | /* | |
816 | * If not root, we cannot increase our max open files. But our | |
817 | * scope is then limited to processes from a single user. | |
818 | */ | |
819 | if (getuid() != 0) | |
820 | return; | |
821 | /* The kernel does not allowed an infinite limit for open files */ | |
822 | lim.rlim_cur = 65535; | |
823 | lim.rlim_max = 65535; | |
824 | ||
825 | ret = setrlimit(RLIMIT_NOFILE, &lim); | |
826 | if (ret < 0) { | |
827 | perror("failed to set open files limit"); | |
828 | } | |
829 | } | |
830 | ||
831 | /* | |
832 | * Usage: | |
833 | * ./ust-basic-tracing outputpath event_name1 event_name2 .... | |
834 | */ | |
835 | int main(int argc, const char **argv) | |
836 | { | |
837 | const char *home_dir; | |
838 | int ret, wait_shm_fd; | |
839 | struct sigaction act; | |
fb50c39d | 840 | mode_t old_umask = 0; |
b0a99af4 MD |
841 | const char *outputpath; |
842 | const char **event_names; | |
843 | unsigned int nr_events; | |
844 | ||
845 | if (argc < 2) { | |
846 | printf("Usage:\n"); | |
847 | printf("%s outputpath event_name1 event_name2 ...\n", | |
848 | argv[0]); | |
849 | exit(-1); | |
850 | } | |
851 | outputpath = argv[1]; | |
852 | event_names = &argv[2]; | |
853 | nr_events = argc - 2; | |
854 | ||
855 | set_ulimit(); | |
856 | ||
857 | /* Ignore sigpipe */ | |
858 | memset(&act, 0, sizeof(act)); | |
859 | ret = sigemptyset(&act.sa_mask); | |
860 | if (ret == -1) { | |
861 | perror("sigemptyset"); | |
862 | return -1; | |
863 | } | |
864 | ||
865 | act.sa_handler = SIG_IGN; | |
866 | ret = sigaction(SIGPIPE, &act, NULL); | |
867 | if (ret == -1) { | |
868 | perror("sigaction"); | |
869 | return -1; | |
870 | } | |
871 | ||
872 | /* Handle SIGTERM */ | |
873 | act.sa_handler = handle_signals; | |
874 | ret = sigaction(SIGTERM, &act, NULL); | |
875 | if (ret == -1) { | |
876 | perror("sigaction"); | |
877 | return -1; | |
878 | } | |
879 | /* Handle SIGINT */ | |
880 | ret = sigaction(SIGINT, &act, NULL); | |
881 | if (ret == -1) { | |
882 | perror("sigaction"); | |
883 | return -1; | |
884 | } | |
885 | ||
886 | if (geteuid() == 0) { | |
887 | ret = mkdir(LTTNG_RUNDIR, S_IRWXU | S_IRWXG | S_IROTH | S_IXOTH); | |
888 | if (ret && errno != EEXIST) { | |
889 | perror("mkdir"); | |
890 | return -1; | |
891 | } | |
892 | wait_shm_fd = get_wait_shm(DEFAULT_GLOBAL_APPS_WAIT_SHM_PATH, | |
893 | sysconf(_SC_PAGE_SIZE), 1); | |
894 | if (wait_shm_fd < 0) { | |
895 | perror("global wait shm error"); | |
896 | return -1; | |
897 | } | |
898 | strcpy(apps_sock_path, DEFAULT_GLOBAL_APPS_UNIX_SOCK); | |
899 | old_umask = umask(0); | |
900 | } else { | |
901 | snprintf(local_apps_wait_shm_path, PATH_MAX, | |
902 | DEFAULT_HOME_APPS_WAIT_SHM_PATH, getuid()); | |
903 | wait_shm_fd = get_wait_shm(local_apps_wait_shm_path, | |
904 | sysconf(_SC_PAGE_SIZE), 0); | |
905 | if (wait_shm_fd < 0) { | |
906 | perror("local wait shm error"); | |
907 | return -1; | |
908 | } | |
909 | home_dir = (const char *) getenv("HOME"); | |
910 | if (!home_dir) { | |
911 | perror("getenv error"); | |
912 | return -ENOENT; | |
913 | } | |
914 | snprintf(apps_sock_path, PATH_MAX, | |
915 | DEFAULT_HOME_APPS_UNIX_SOCK, home_dir); | |
916 | } | |
917 | ||
918 | ret = lttcomm_create_unix_sock(apps_sock_path); | |
919 | if (ret < 0) { | |
920 | perror("create error"); | |
921 | return ret; | |
922 | } | |
923 | apps_socket = ret; | |
924 | ||
925 | if (getuid() == 0) { | |
926 | /* File permission MUST be 666 */ | |
927 | ret = chmod(apps_sock_path, | |
928 | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH); | |
929 | if (ret < 0) { | |
930 | printf("Set file permissions failed: %s\n", apps_sock_path); | |
931 | perror("chmod"); | |
932 | goto end; | |
933 | } | |
934 | umask(old_umask); | |
935 | } | |
936 | ret = lttcomm_listen_unix_sock(apps_socket); | |
937 | if (ret < 0) { | |
938 | perror("listen error"); | |
939 | return ret; | |
940 | } | |
941 | ||
942 | /* wake up futexes */ | |
943 | ret = update_futex(wait_shm_fd, 1); | |
944 | if (ret) { | |
945 | fprintf(stderr, "Error wakeup futex\n"); | |
946 | return -1; | |
947 | } | |
948 | ||
949 | for (;;) { | |
950 | int sock; | |
951 | ssize_t len; | |
952 | struct { | |
953 | uint32_t major; | |
954 | uint32_t minor; | |
955 | pid_t pid; | |
956 | pid_t ppid; | |
957 | uid_t uid; | |
958 | gid_t gid; | |
959 | char name[16]; /* Process name */ | |
960 | } reg_msg; | |
961 | char bufname[17]; | |
962 | ||
963 | if (quit_program) | |
964 | break; | |
965 | ||
966 | printf("Accepting application registration\n"); | |
967 | sock = lttcomm_accept_unix_sock(apps_socket); | |
968 | if (sock < 0) { | |
969 | perror("accept error"); | |
970 | goto end; | |
971 | } | |
972 | ||
973 | /* | |
974 | * Basic recv here to handle the very simple data | |
975 | * that the libust send to register (reg_msg). | |
976 | */ | |
977 | len = lttcomm_recv_unix_sock(sock, ®_msg, sizeof(reg_msg)); | |
978 | if (len < 0 || len != sizeof(reg_msg)) { | |
979 | perror("lttcomm_recv_unix_sock"); | |
980 | continue; | |
981 | } | |
982 | memcpy(bufname, reg_msg.name, 16); | |
983 | bufname[16] = '\0'; | |
984 | printf("Application %s pid %u ppid %u uid %u gid %u has registered (version : %u.%u)\n", | |
985 | bufname, reg_msg.pid, reg_msg.ppid, reg_msg.uid, | |
986 | reg_msg.gid, reg_msg.major, reg_msg.minor); | |
987 | ret = send_app_msgs(sock, outputpath, nr_events, event_names); | |
988 | if (ret) { | |
989 | printf("Error in send_app_msgs.\n"); | |
990 | sleep(1); | |
991 | } | |
992 | close(sock); | |
993 | } | |
994 | ||
995 | end: | |
996 | printf("quitting.\n"); | |
997 | /* Let applications know we are not responding anymore */ | |
998 | ret = update_futex(wait_shm_fd, 0); | |
999 | if (ret) { | |
1000 | fprintf(stderr, "Error wakeup futex\n"); | |
1001 | return -1; | |
1002 | } | |
1003 | ||
1004 | return 0; | |
1005 | } |