Fix: Conditionally disable test requiring shared libs
[lttng-tools.git] / src / common / ust-consumer / ust-consumer.c
CommitLineData
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1/*
2 * Copyright (C) 2011 - Julien Desfossez <julien.desfossez@polymtl.ca>
3 * Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
4 *
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5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License, version 2 only,
7 * as published by the Free Software Foundation.
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8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
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14 * You should have received a copy of the GNU General Public License along
15 * with this program; if not, write to the Free Software Foundation, Inc.,
16 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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17 */
18
19#define _GNU_SOURCE
20#include <assert.h>
f02e1e8a 21#include <lttng/ust-ctl.h>
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22#include <poll.h>
23#include <pthread.h>
24#include <stdlib.h>
25#include <string.h>
26#include <sys/mman.h>
27#include <sys/socket.h>
dbb5dfe6 28#include <sys/stat.h>
3bd1e081 29#include <sys/types.h>
77c7c900 30#include <inttypes.h>
3bd1e081 31#include <unistd.h>
0857097f 32
990570ed 33#include <common/common.h>
10a8a223 34#include <common/sessiond-comm/sessiond-comm.h>
00e2e675 35#include <common/relayd/relayd.h>
dbb5dfe6 36#include <common/compat/fcntl.h>
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37
38#include "ust-consumer.h"
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39
40extern struct lttng_consumer_global_data consumer_data;
41extern int consumer_poll_timeout;
42extern volatile int consumer_quit;
43
44/*
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45 * Wrapper over the mmap() read offset from ust-ctl library. Since this can be
46 * compiled out, we isolate it in this library.
3bd1e081 47 */
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48int lttng_ustctl_get_mmap_read_offset(struct lttng_ust_shm_handle *handle,
49 struct lttng_ust_lib_ring_buffer *buf, unsigned long *off)
3bd1e081 50{
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51 return ustctl_get_mmap_read_offset(handle, buf, off);
52};
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53
54/*
55 * Take a snapshot for a specific fd
56 *
57 * Returns 0 on success, < 0 on error
58 */
59int lttng_ustconsumer_take_snapshot(struct lttng_consumer_local_data *ctx,
60 struct lttng_consumer_stream *stream)
61{
62 int ret = 0;
63
64 ret = ustctl_snapshot(stream->chan->handle, stream->buf);
65 if (ret != 0) {
87dc6a9c 66 errno = -ret;
4c462e79 67 PERROR("Getting sub-buffer snapshot.");
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68 }
69
70 return ret;
71}
72
73/*
74 * Get the produced position
75 *
76 * Returns 0 on success, < 0 on error
77 */
78int lttng_ustconsumer_get_produced_snapshot(
79 struct lttng_consumer_local_data *ctx,
80 struct lttng_consumer_stream *stream,
81 unsigned long *pos)
82{
83 int ret;
84
85 ret = ustctl_snapshot_get_produced(stream->chan->handle,
86 stream->buf, pos);
87 if (ret != 0) {
87dc6a9c 88 errno = -ret;
3be74084 89 PERROR("ustctl_snapshot_get_produced");
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90 }
91
92 return ret;
93}
94
4cbc1a04
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95/*
96 * Receive command from session daemon and process it.
97 *
98 * Return 1 on success else a negative value or 0.
99 */
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100int lttng_ustconsumer_recv_cmd(struct lttng_consumer_local_data *ctx,
101 int sock, struct pollfd *consumer_sockpoll)
102{
103 ssize_t ret;
f50f23d9 104 enum lttng_error_code ret_code = LTTNG_OK;
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105 struct lttcomm_consumer_msg msg;
106
107 ret = lttcomm_recv_unix_sock(sock, &msg, sizeof(msg));
108 if (ret != sizeof(msg)) {
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109 DBG("Consumer received unexpected message size %zd (expects %zu)",
110 ret, sizeof(msg));
f73fabfd 111 lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_ERROR_RECV_FD);
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112 /*
113 * The ret value might 0 meaning an orderly shutdown but this is ok
114 * since the caller handles this.
115 */
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116 return ret;
117 }
118 if (msg.cmd_type == LTTNG_CONSUMER_STOP) {
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119 /*
120 * Notify the session daemon that the command is completed.
121 *
122 * On transport layer error, the function call will print an error
123 * message so handling the returned code is a bit useless since we
124 * return an error code anyway.
125 */
126 (void) consumer_send_status_msg(sock, ret_code);
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127 return -ENOENT;
128 }
129
3f8e211f 130 /* relayd needs RCU read-side lock */
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131 rcu_read_lock();
132
3bd1e081 133 switch (msg.cmd_type) {
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134 case LTTNG_CONSUMER_ADD_RELAYD_SOCKET:
135 {
f50f23d9 136 /* Session daemon status message are handled in the following call. */
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137 ret = consumer_add_relayd_socket(msg.u.relayd_sock.net_index,
138 msg.u.relayd_sock.type, ctx, sock, consumer_sockpoll,
46e6455f 139 &msg.u.relayd_sock.sock, msg.u.relayd_sock.session_id);
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140 goto end_nosignal;
141 }
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142 case LTTNG_CONSUMER_ADD_CHANNEL:
143 {
144 struct lttng_consumer_channel *new_channel;
145 int fds[1];
146 size_t nb_fd = 1;
147
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148 DBG("UST Consumer adding channel");
149
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150 /* First send a status message before receiving the fds. */
151 ret = consumer_send_status_msg(sock, ret_code);
152 if (ret < 0) {
153 /* Somehow, the session daemon is not responding anymore. */
154 goto end_nosignal;
155 }
156
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157 /* block */
158 if (lttng_consumer_poll_socket(consumer_sockpoll) < 0) {
3f8e211f 159 rcu_read_unlock();
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160 return -EINTR;
161 }
162 ret = lttcomm_recv_fds_unix_sock(sock, fds, nb_fd);
163 if (ret != sizeof(fds)) {
f73fabfd 164 lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_ERROR_RECV_FD);
3f8e211f 165 rcu_read_unlock();
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166 /*
167 * The ret value might 0 meaning an orderly shutdown but this is ok
168 * since the caller handles this.
169 */
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170 return ret;
171 }
172
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173 /*
174 * Send status code to session daemon only if the recv works. If the
175 * above recv() failed, the session daemon is notified through the
176 * error socket and the teardown is eventually done.
177 */
178 ret = consumer_send_status_msg(sock, ret_code);
179 if (ret < 0) {
180 /* Somehow, the session daemon is not responding anymore. */
181 goto end_nosignal;
182 }
183
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184 DBG("consumer_add_channel %d", msg.u.channel.channel_key);
185
186 new_channel = consumer_allocate_channel(msg.u.channel.channel_key,
187 fds[0], -1,
188 msg.u.channel.mmap_len,
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189 msg.u.channel.max_sb_size,
190 msg.u.channel.nb_init_streams);
3bd1e081 191 if (new_channel == NULL) {
f73fabfd 192 lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_OUTFD_ERROR);
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193 goto end_nosignal;
194 }
195 if (ctx->on_recv_channel != NULL) {
196 ret = ctx->on_recv_channel(new_channel);
197 if (ret == 0) {
198 consumer_add_channel(new_channel);
199 } else if (ret < 0) {
200 goto end_nosignal;
201 }
202 } else {
203 consumer_add_channel(new_channel);
204 }
205 goto end_nosignal;
206 }
207 case LTTNG_CONSUMER_ADD_STREAM:
208 {
209 struct lttng_consumer_stream *new_stream;
50f8ae69 210 int fds[2], stream_pipe;
3bd1e081 211 size_t nb_fd = 2;
00e2e675 212 struct consumer_relayd_sock_pair *relayd = NULL;
c80048c6 213 int alloc_ret = 0;
3bd1e081 214
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215 DBG("UST Consumer adding stream");
216
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217 /* First send a status message before receiving the fds. */
218 ret = consumer_send_status_msg(sock, ret_code);
219 if (ret < 0) {
220 /* Somehow, the session daemon is not responding anymore. */
221 goto end_nosignal;
222 }
223
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224 /* block */
225 if (lttng_consumer_poll_socket(consumer_sockpoll) < 0) {
3f8e211f 226 rcu_read_unlock();
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227 return -EINTR;
228 }
229 ret = lttcomm_recv_fds_unix_sock(sock, fds, nb_fd);
230 if (ret != sizeof(fds)) {
f73fabfd 231 lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_ERROR_RECV_FD);
3f8e211f 232 rcu_read_unlock();
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233 /*
234 * The ret value might 0 meaning an orderly shutdown but this is ok
235 * since the caller handles this.
236 */
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237 return ret;
238 }
239
f50f23d9
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240 /*
241 * Send status code to session daemon only if the recv works. If the
242 * above recv() failed, the session daemon is notified through the
243 * error socket and the teardown is eventually done.
244 */
245 ret = consumer_send_status_msg(sock, ret_code);
246 if (ret < 0) {
247 /* Somehow, the session daemon is not responding anymore. */
248 goto end_nosignal;
249 }
250
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251 DBG("Consumer command ADD_STREAM chan %d stream %d",
252 msg.u.stream.channel_key, msg.u.stream.stream_key);
173af62f 253
d41f73b7 254 assert(msg.u.stream.output == LTTNG_EVENT_MMAP);
173af62f 255 new_stream = consumer_allocate_stream(msg.u.stream.channel_key,
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256 msg.u.stream.stream_key,
257 fds[0], fds[1],
258 msg.u.stream.state,
259 msg.u.stream.mmap_len,
260 msg.u.stream.output,
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261 msg.u.stream.path_name,
262 msg.u.stream.uid,
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263 msg.u.stream.gid,
264 msg.u.stream.net_index,
c80048c6 265 msg.u.stream.metadata_flag,
53632229 266 msg.u.stream.session_id,
c80048c6 267 &alloc_ret);
3bd1e081 268 if (new_stream == NULL) {
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MD
269 switch (alloc_ret) {
270 case -ENOMEM:
271 case -EINVAL:
272 default:
273 lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_OUTFD_ERROR);
274 break;
275 case -ENOENT:
276 /*
277 * We could not find the channel. Can happen if cpu hotplug
278 * happens while tearing down.
279 */
280 DBG3("Could not find channel");
281 break;
282 }
3f8e211f 283 goto end_nosignal;
3bd1e081 284 }
00e2e675
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285
286 /* The stream is not metadata. Get relayd reference if exists. */
287 relayd = consumer_find_relayd(msg.u.stream.net_index);
288 if (relayd != NULL) {
289 pthread_mutex_lock(&relayd->ctrl_sock_mutex);
290 /* Add stream on the relayd */
291 ret = relayd_add_stream(&relayd->control_sock,
292 msg.u.stream.name, msg.u.stream.path_name,
293 &new_stream->relayd_stream_id);
294 pthread_mutex_unlock(&relayd->ctrl_sock_mutex);
295 if (ret < 0) {
e316aad5 296 consumer_del_stream(new_stream, NULL);
3f8e211f 297 goto end_nosignal;
00e2e675
DG
298 }
299 } else if (msg.u.stream.net_index != -1) {
300 ERR("Network sequence index %d unknown. Not adding stream.",
301 msg.u.stream.net_index);
e316aad5 302 consumer_del_stream(new_stream, NULL);
3f8e211f 303 goto end_nosignal;
00e2e675
DG
304 }
305
633d0084
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306 /* Do actions once stream has been received. */
307 if (ctx->on_recv_stream) {
308 ret = ctx->on_recv_stream(new_stream);
309 if (ret < 0) {
e316aad5 310 consumer_del_stream(new_stream, NULL);
633d0084 311 goto end_nosignal;
fb3a43a9 312 }
633d0084 313 }
fb3a43a9 314
50f8ae69 315 /* Get the right pipe where the stream will be sent. */
633d0084 316 if (new_stream->metadata_flag) {
50f8ae69 317 stream_pipe = ctx->consumer_metadata_pipe[1];
3bd1e081 318 } else {
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DG
319 stream_pipe = ctx->consumer_data_pipe[1];
320 }
321
322 do {
323 ret = write(stream_pipe, &new_stream, sizeof(new_stream));
324 } while (ret < 0 && errno == EINTR);
325 if (ret < 0) {
326 PERROR("Consumer write %s stream to pipe %d",
327 new_stream->metadata_flag ? "metadata" : "data",
328 stream_pipe);
329 consumer_del_stream(new_stream, NULL);
330 goto end_nosignal;
3bd1e081 331 }
00e2e675 332
50f8ae69 333 DBG("UST consumer ADD_STREAM %s (%d,%d) with relayd id %" PRIu64,
00e2e675
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334 msg.u.stream.path_name, fds[0], fds[1],
335 new_stream->relayd_stream_id);
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336 break;
337 }
173af62f
DG
338 case LTTNG_CONSUMER_DESTROY_RELAYD:
339 {
a6ba4fe1 340 uint64_t index = msg.u.destroy_relayd.net_seq_idx;
173af62f
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341 struct consumer_relayd_sock_pair *relayd;
342
a6ba4fe1 343 DBG("UST consumer destroying relayd %" PRIu64, index);
173af62f
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344
345 /* Get relayd reference if exists. */
a6ba4fe1 346 relayd = consumer_find_relayd(index);
173af62f 347 if (relayd == NULL) {
3448e266 348 DBG("Unable to find relayd %" PRIu64, index);
f50f23d9 349 ret_code = LTTNG_ERR_NO_CONSUMER;
173af62f
DG
350 }
351
a6ba4fe1
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352 /*
353 * Each relayd socket pair has a refcount of stream attached to it
354 * which tells if the relayd is still active or not depending on the
355 * refcount value.
356 *
357 * This will set the destroy flag of the relayd object and destroy it
358 * if the refcount reaches zero when called.
359 *
360 * The destroy can happen either here or when a stream fd hangs up.
361 */
f50f23d9
DG
362 if (relayd) {
363 consumer_flag_relayd_for_destroy(relayd);
364 }
365
366 ret = consumer_send_status_msg(sock, ret_code);
367 if (ret < 0) {
368 /* Somehow, the session daemon is not responding anymore. */
369 goto end_nosignal;
370 }
173af62f 371
3f8e211f 372 goto end_nosignal;
173af62f 373 }
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MD
374 case LTTNG_CONSUMER_UPDATE_STREAM:
375 {
3f8e211f 376 rcu_read_unlock();
7ad0a0cb 377 return -ENOSYS;
3bd1e081 378 }
6d805429 379 case LTTNG_CONSUMER_DATA_PENDING:
53632229 380 {
3be74084 381 int ret, is_data_pending;
6d805429 382 uint64_t id = msg.u.data_pending.session_id;
ca22feea 383
6d805429 384 DBG("UST consumer data pending command for id %" PRIu64, id);
ca22feea 385
3be74084 386 is_data_pending = consumer_data_pending(id);
ca22feea
DG
387
388 /* Send back returned value to session daemon */
3be74084
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389 ret = lttcomm_send_unix_sock(sock, &is_data_pending,
390 sizeof(is_data_pending));
ca22feea 391 if (ret < 0) {
3be74084 392 DBG("Error when sending the data pending ret code: %d", ret);
ca22feea 393 }
f50f23d9
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394
395 /*
396 * No need to send back a status message since the data pending
397 * returned value is the response.
398 */
ca22feea 399 break;
53632229 400 }
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401 default:
402 break;
403 }
3f8e211f 404
3bd1e081 405end_nosignal:
b0b335c8 406 rcu_read_unlock();
4cbc1a04
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407
408 /*
409 * Return 1 to indicate success since the 0 value can be a socket
410 * shutdown during the recv() or send() call.
411 */
412 return 1;
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413}
414
415int lttng_ustconsumer_allocate_channel(struct lttng_consumer_channel *chan)
416{
13161846 417 struct lttng_ust_object_data obj;
3bd1e081
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418
419 obj.handle = -1;
420 obj.shm_fd = chan->shm_fd;
421 obj.wait_fd = chan->wait_fd;
422 obj.memory_map_size = chan->mmap_len;
423 chan->handle = ustctl_map_channel(&obj);
424 if (!chan->handle) {
425 return -ENOMEM;
426 }
b5c5fc29 427 chan->wait_fd_is_copy = 1;
2c1dd183 428 chan->shm_fd = -1;
b5c5fc29 429
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430 return 0;
431}
432
d056b477
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433void lttng_ustconsumer_on_stream_hangup(struct lttng_consumer_stream *stream)
434{
435 ustctl_flush_buffer(stream->chan->handle, stream->buf, 0);
effcf122 436 stream->hangup_flush_done = 1;
d056b477
MD
437}
438
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439void lttng_ustconsumer_del_channel(struct lttng_consumer_channel *chan)
440{
441 ustctl_unmap_channel(chan->handle);
442}
443
e316aad5 444int lttng_ustconsumer_add_stream(struct lttng_consumer_stream *stream)
3bd1e081 445{
13161846 446 struct lttng_ust_object_data obj;
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447 int ret;
448
449 obj.handle = -1;
450 obj.shm_fd = stream->shm_fd;
451 obj.wait_fd = stream->wait_fd;
452 obj.memory_map_size = stream->mmap_len;
453 ret = ustctl_add_stream(stream->chan->handle, &obj);
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454 if (ret) {
455 ERR("UST ctl add_stream failed with ret %d", ret);
e316aad5 456 goto error;
7a57cf92
DG
457 }
458
3bd1e081 459 stream->buf = ustctl_open_stream_read(stream->chan->handle, stream->cpu);
7a57cf92
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460 if (!stream->buf) {
461 ERR("UST ctl open_stream_read failed");
e316aad5
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462 ret = -EBUSY;
463 goto error;
7a57cf92
DG
464 }
465
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466 /* ustctl_open_stream_read has closed the shm fd. */
467 stream->wait_fd_is_copy = 1;
468 stream->shm_fd = -1;
469
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470 stream->mmap_base = ustctl_get_mmap_base(stream->chan->handle, stream->buf);
471 if (!stream->mmap_base) {
7a57cf92 472 ERR("UST ctl get_mmap_base failed");
e316aad5
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473 ret = -EINVAL;
474 goto mmap_error;
3bd1e081 475 }
ee77a7b0 476
3bd1e081 477 return 0;
e316aad5
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478
479mmap_error:
480 ustctl_close_stream_read(stream->chan->handle, stream->buf);
481error:
482 return ret;
3bd1e081
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483}
484
485void lttng_ustconsumer_del_stream(struct lttng_consumer_stream *stream)
486{
487 ustctl_close_stream_read(stream->chan->handle, stream->buf);
488}
d41f73b7
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489
490
491int lttng_ustconsumer_read_subbuffer(struct lttng_consumer_stream *stream,
492 struct lttng_consumer_local_data *ctx)
493{
1d4dfdef 494 unsigned long len, subbuf_size, padding;
d41f73b7
MD
495 int err;
496 long ret = 0;
497 struct lttng_ust_shm_handle *handle;
498 struct lttng_ust_lib_ring_buffer *buf;
499 char dummy;
d41f73b7
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500
501 DBG("In read_subbuffer (wait_fd: %d, stream key: %d)",
502 stream->wait_fd, stream->key);
503
504 /* We can consume the 1 byte written into the wait_fd by UST */
effcf122 505 if (!stream->hangup_flush_done) {
c617c0c6
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506 ssize_t readlen;
507
effcf122
MD
508 do {
509 readlen = read(stream->wait_fd, &dummy, 1);
87dc6a9c 510 } while (readlen == -1 && errno == EINTR);
effcf122
MD
511 if (readlen == -1) {
512 ret = readlen;
513 goto end;
514 }
d41f73b7
MD
515 }
516
517 buf = stream->buf;
518 handle = stream->chan->handle;
519 /* Get the next subbuffer */
520 err = ustctl_get_next_subbuf(handle, buf);
521 if (err != 0) {
1d4dfdef 522 ret = err; /* ustctl_get_next_subbuf returns negative, caller expect positive. */
d41f73b7
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523 /*
524 * This is a debug message even for single-threaded consumer,
525 * because poll() have more relaxed criterions than get subbuf,
526 * so get_subbuf may fail for short race windows where poll()
527 * would issue wakeups.
528 */
529 DBG("Reserving sub buffer failed (everything is normal, "
530 "it is due to concurrency)");
531 goto end;
532 }
533 assert(stream->output == LTTNG_EVENT_MMAP);
1d4dfdef 534 /* Get the full padded subbuffer size */
d41f73b7 535 err = ustctl_get_padded_subbuf_size(handle, buf, &len);
effcf122 536 assert(err == 0);
1d4dfdef
DG
537
538 /* Get subbuffer data size (without padding) */
539 err = ustctl_get_subbuf_size(handle, buf, &subbuf_size);
540 assert(err == 0);
541
542 /* Make sure we don't get a subbuffer size bigger than the padded */
543 assert(len >= subbuf_size);
544
545 padding = len - subbuf_size;
d41f73b7 546 /* write the subbuffer to the tracefile */
1d4dfdef 547 ret = lttng_consumer_on_read_subbuffer_mmap(ctx, stream, subbuf_size, padding);
91dfef6e
DG
548 /*
549 * The mmap operation should write subbuf_size amount of data when network
550 * streaming or the full padding (len) size when we are _not_ streaming.
551 */
552 if ((ret != subbuf_size && stream->net_seq_idx != -1) ||
553 (ret != len && stream->net_seq_idx == -1)) {
d41f73b7 554 /*
91dfef6e 555 * Display the error but continue processing to try to release the
c5c45efa
DG
556 * subbuffer. This is a DBG statement since any unexpected kill or
557 * signal, the application gets unregistered, relayd gets closed or
558 * anything that affects the buffer lifetime will trigger this error.
559 * So, for the sake of the user, don't print this error since it can
560 * happen and it is OK with the code flow.
d41f73b7 561 */
c5c45efa 562 DBG("Error writing to tracefile "
91dfef6e
DG
563 "(ret: %zd != len: %lu != subbuf_size: %lu)",
564 ret, len, subbuf_size);
d41f73b7
MD
565 }
566 err = ustctl_put_next_subbuf(handle, buf);
effcf122 567 assert(err == 0);
d41f73b7
MD
568end:
569 return ret;
570}
571
572int lttng_ustconsumer_on_recv_stream(struct lttng_consumer_stream *stream)
573{
574 int ret;
575
576 /* Opening the tracefile in write mode */
00e2e675 577 if (stream->path_name != NULL && stream->net_seq_idx == -1) {
e11d277b 578 ret = run_as_open(stream->path_name,
60b6c79c
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579 O_WRONLY|O_CREAT|O_TRUNC,
580 S_IRWXU|S_IRWXG|S_IRWXO,
581 stream->uid, stream->gid);
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582 if (ret < 0) {
583 ERR("Opening %s", stream->path_name);
4c462e79 584 PERROR("open");
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585 goto error;
586 }
587 stream->out_fd = ret;
588 }
589
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590 ret = lttng_ustconsumer_add_stream(stream);
591 if (ret) {
592 consumer_del_stream(stream, NULL);
593 ret = -1;
594 goto error;
595 }
596
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597 /* we return 0 to let the library handle the FD internally */
598 return 0;
599
600error:
601 return ret;
602}
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603
604/*
605 * Check if data is still being extracted from the buffers for a specific
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606 * stream. Consumer data lock MUST be acquired before calling this function
607 * and the stream lock.
ca22feea 608 *
6d805429 609 * Return 1 if the traced data are still getting read else 0 meaning that the
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610 * data is available for trace viewer reading.
611 */
6d805429 612int lttng_ustconsumer_data_pending(struct lttng_consumer_stream *stream)
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613{
614 int ret;
615
616 assert(stream);
617
6d805429 618 DBG("UST consumer checking data pending");
c8f59ee5 619
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620 ret = ustctl_get_next_subbuf(stream->chan->handle, stream->buf);
621 if (ret == 0) {
622 /* There is still data so let's put back this subbuffer. */
623 ret = ustctl_put_subbuf(stream->chan->handle, stream->buf);
624 assert(ret == 0);
6d805429 625 ret = 1; /* Data is pending */
4e9a4686 626 goto end;
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627 }
628
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629 /* Data is NOT pending so ready to be read. */
630 ret = 0;
ca22feea 631
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632end:
633 return ret;
ca22feea 634}
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