Fix: don't print channel name on enable JUL event
[lttng-tools.git] / src / bin / lttng-sessiond / ust-consumer.c
CommitLineData
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1/*
2 * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
3 *
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4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License, version 2 only,
6 * as published by the Free Software Foundation.
48842b30 7 *
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8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
48842b30 12 *
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13 * You should have received a copy of the GNU General Public License along
14 * with this program; if not, write to the Free Software Foundation, Inc.,
15 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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16 */
17
18#define _GNU_SOURCE
19#include <errno.h>
20#include <stdio.h>
21#include <stdlib.h>
22#include <string.h>
23#include <unistd.h>
d88aee68 24#include <inttypes.h>
48842b30 25
990570ed 26#include <common/common.h>
db758600 27#include <common/consumer.h>
990570ed 28#include <common/defaults.h>
48842b30 29
00e2e675 30#include "consumer.h"
8782cc74 31#include "health-sessiond.h"
48842b30 32#include "ust-consumer.h"
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33#include "buffer-registry.h"
34#include "session.h"
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35
36/*
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37 * Return allocated full pathname of the session using the consumer trace path
38 * and subdir if available. On a successful allocation, the directory of the
39 * trace is created with the session credentials.
40 *
41 * The caller can safely free(3) the returned value. On error, NULL is
42 * returned.
48842b30 43 */
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44static char *setup_trace_path(struct consumer_output *consumer,
45 struct ust_app_session *ua_sess)
48842b30 46{
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47 int ret;
48 char *pathname;
37278a1e 49
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50 assert(consumer);
51 assert(ua_sess);
00e2e675 52
840cb59c 53 health_code_update();
ca03de58 54
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55 /* Allocate our self the string to make sure we never exceed PATH_MAX. */
56 pathname = zmalloc(PATH_MAX);
57 if (!pathname) {
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58 goto error;
59 }
00e2e675 60
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61 /* Get correct path name destination */
62 if (consumer->type == CONSUMER_DST_LOCAL) {
63 /* Set application path to the destination path */
dec56f6c 64 ret = snprintf(pathname, PATH_MAX, "%s%s%s",
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65 consumer->dst.trace_path, consumer->subdir, ua_sess->path);
66 if (ret < 0) {
67 PERROR("snprintf channel path");
68 goto error;
69 }
ca03de58 70
ffe60014 71 /* Create directory. Ignore if exist. */
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72 ret = run_as_mkdir_recursive(pathname, S_IRWXU | S_IRWXG,
73 ua_sess->euid, ua_sess->egid);
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74 if (ret < 0) {
75 if (ret != -EEXIST) {
76 ERR("Trace directory creation error");
77 goto error;
78 }
79 }
80 } else {
dec56f6c 81 ret = snprintf(pathname, PATH_MAX, "%s%s", consumer->subdir,
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82 ua_sess->path);
83 if (ret < 0) {
84 PERROR("snprintf channel path");
85 goto error;
86 }
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87 }
88
ffe60014 89 return pathname;
ca03de58 90
37278a1e 91error:
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92 free(pathname);
93 return NULL;
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94}
95
96/*
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97 * Send a single channel to the consumer using command ADD_CHANNEL.
98 *
7972aab2 99 * Consumer socket lock MUST be acquired before calling this.
37278a1e 100 */
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101static int ask_channel_creation(struct ust_app_session *ua_sess,
102 struct ust_app_channel *ua_chan, struct consumer_output *consumer,
7972aab2 103 struct consumer_socket *socket, struct ust_registry_session *registry)
37278a1e 104{
0c759fc9 105 int ret, output;
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106 uint32_t chan_id;
107 uint64_t key, chan_reg_key;
ffe60014 108 char *pathname = NULL;
37278a1e 109 struct lttcomm_consumer_msg msg;
7972aab2 110 struct ust_registry_channel *chan_reg;
37278a1e 111
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112 assert(ua_sess);
113 assert(ua_chan);
114 assert(socket);
37278a1e 115 assert(consumer);
7972aab2 116 assert(registry);
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117
118 DBG2("Asking UST consumer for channel");
119
120 /* Get and create full trace path of session. */
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121 if (ua_sess->output_traces) {
122 pathname = setup_trace_path(consumer, ua_sess);
123 if (!pathname) {
124 ret = -1;
125 goto error;
126 }
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127 }
128
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129 /* Depending on the buffer type, a different channel key is used. */
130 if (ua_sess->buffer_type == LTTNG_BUFFER_PER_UID) {
131 chan_reg_key = ua_chan->tracing_channel_id;
132 } else {
133 chan_reg_key = ua_chan->key;
134 }
135
136 if (ua_chan->attr.type == LTTNG_UST_CHAN_METADATA) {
137 chan_id = -1U;
138 } else {
139 chan_reg = ust_registry_channel_find(registry, chan_reg_key);
140 assert(chan_reg);
141 chan_id = chan_reg->chan_id;
142 }
143
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144 switch (ua_chan->attr.output) {
145 case LTTNG_UST_MMAP:
146 default:
147 output = LTTNG_EVENT_MMAP;
148 break;
149 }
150
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151 consumer_init_ask_channel_comm_msg(&msg,
152 ua_chan->attr.subbuf_size,
153 ua_chan->attr.num_subbuf,
154 ua_chan->attr.overwrite,
155 ua_chan->attr.switch_timer_interval,
156 ua_chan->attr.read_timer_interval,
ecc48a90 157 ua_sess->live_timer_interval,
0c759fc9 158 output,
ffe60014 159 (int) ua_chan->attr.type,
7972aab2 160 ua_sess->tracing_id,
ca22feea 161 pathname,
ffe60014 162 ua_chan->name,
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163 ua_sess->euid,
164 ua_sess->egid,
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165 consumer->net_seq_index,
166 ua_chan->key,
7972aab2 167 registry->uuid,
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168 chan_id,
169 ua_chan->tracefile_size,
2bba9e53 170 ua_chan->tracefile_count,
1950109e 171 ua_sess->id,
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172 ua_sess->output_traces,
173 ua_sess->uid);
37278a1e 174
840cb59c 175 health_code_update();
ca03de58 176
52898cb1 177 ret = consumer_socket_send(socket, &msg, sizeof(msg));
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178 if (ret < 0) {
179 goto error;
180 }
181
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182 ret = consumer_recv_status_channel(socket, &key,
183 &ua_chan->expected_stream_count);
184 if (ret < 0) {
185 goto error;
186 }
187 /* Communication protocol error. */
188 assert(key == ua_chan->key);
189 /* We need at least one where 1 stream for 1 cpu. */
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190 if (ua_sess->output_traces) {
191 assert(ua_chan->expected_stream_count > 0);
192 }
ffe60014 193
d88aee68 194 DBG2("UST ask channel %" PRIu64 " successfully done with %u stream(s)", key,
ffe60014 195 ua_chan->expected_stream_count);
ca03de58 196
37278a1e 197error:
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198 free(pathname);
199 health_code_update();
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200 return ret;
201}
202
203/*
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204 * Ask consumer to create a channel for a given session.
205 *
206 * Returns 0 on success else a negative value.
37278a1e 207 */
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208int ust_consumer_ask_channel(struct ust_app_session *ua_sess,
209 struct ust_app_channel *ua_chan, struct consumer_output *consumer,
7972aab2 210 struct consumer_socket *socket, struct ust_registry_session *registry)
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211{
212 int ret;
37278a1e 213
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214 assert(ua_sess);
215 assert(ua_chan);
216 assert(consumer);
217 assert(socket);
7972aab2 218 assert(registry);
f50f23d9 219
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220 if (!consumer->enabled) {
221 ret = -LTTNG_ERR_NO_CONSUMER;
222 DBG3("Consumer is disabled");
223 goto error;
224 }
225
ffe60014 226 pthread_mutex_lock(socket->lock);
37278a1e 227
7972aab2 228 ret = ask_channel_creation(ua_sess, ua_chan, consumer, socket, registry);
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229 if (ret < 0) {
230 goto error;
231 }
232
48842b30 233error:
ffe60014 234 pthread_mutex_unlock(socket->lock);
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235 return ret;
236}
237
238/*
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239 * Send a get channel command to consumer using the given channel key. The
240 * channel object is populated and the stream list.
241 *
242 * Return 0 on success else a negative value.
48842b30 243 */
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244int ust_consumer_get_channel(struct consumer_socket *socket,
245 struct ust_app_channel *ua_chan)
48842b30 246{
ffe60014 247 int ret;
37278a1e 248 struct lttcomm_consumer_msg msg;
48842b30 249
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250 assert(ua_chan);
251 assert(socket);
48842b30 252
53efb85a 253 memset(&msg, 0, sizeof(msg));
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254 msg.cmd_type = LTTNG_CONSUMER_GET_CHANNEL;
255 msg.u.get_channel.key = ua_chan->key;
37278a1e 256
ffe60014 257 pthread_mutex_lock(socket->lock);
840cb59c 258 health_code_update();
ca03de58 259
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260 /* Send command and wait for OK reply. */
261 ret = consumer_send_msg(socket, &msg);
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262 if (ret < 0) {
263 goto error;
264 }
265
ffe60014 266 /* First, get the channel from consumer. */
9363801e 267 ret = ustctl_recv_channel_from_consumer(*socket->fd_ptr, &ua_chan->obj);
37278a1e 268 if (ret < 0) {
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269 if (ret != -EPIPE) {
270 ERR("Error recv channel from consumer %d with ret %d",
9363801e 271 *socket->fd_ptr, ret);
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272 } else {
273 DBG3("UST app recv channel from consumer. Consumer is dead.");
274 }
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275 goto error;
276 }
00e2e675 277
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278 /* Next, get all streams. */
279 while (1) {
280 struct ust_app_stream *stream;
ca03de58 281
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282 /* Create UST stream */
283 stream = ust_app_alloc_stream();
284 if (stream == NULL) {
285 ret = -ENOMEM;
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286 goto error;
287 }
288
ffe60014 289 /* Stream object is populated by this call if successful. */
9363801e 290 ret = ustctl_recv_stream_from_consumer(*socket->fd_ptr, &stream->obj);
37278a1e 291 if (ret < 0) {
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292 free(stream);
293 if (ret == -LTTNG_UST_ERR_NOENT) {
294 DBG3("UST app consumer has no more stream available");
295 ret = 0;
296 break;
297 }
298 if (ret != -EPIPE) {
299 ERR("Recv stream from consumer %d with ret %d",
9363801e 300 *socket->fd_ptr, ret);
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301 } else {
302 DBG3("UST app recv stream from consumer. Consumer is dead.");
00e2e675 303 }
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304 goto error;
305 }
37278a1e 306
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307 /* Order is important this is why a list is used. */
308 cds_list_add_tail(&stream->list, &ua_chan->streams.head);
309 ua_chan->streams.count++;
37278a1e 310
5368d366 311 DBG2("UST app stream %d received successfully", ua_chan->streams.count);
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312 }
313
314 /* This MUST match or else we have a synchronization problem. */
315 assert(ua_chan->expected_stream_count == ua_chan->streams.count);
ca03de58 316
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317 /* Wait for confirmation that we can proceed with the streams. */
318 ret = consumer_recv_status_reply(socket);
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319 if (ret < 0) {
320 goto error;
321 }
322
323error:
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324 health_code_update();
325 pthread_mutex_unlock(socket->lock);
37278a1e
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326 return ret;
327}
328
329/*
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330 * Send a destroy channel command to consumer using the given channel key.
331 *
332 * Note that this command MUST be used prior to a successful
333 * LTTNG_CONSUMER_GET_CHANNEL because once this command is done successfully,
334 * the streams are dispatched to the consumer threads and MUST be teardown
335 * through the hang up process.
336 *
337 * Return 0 on success else a negative value.
37278a1e 338 */
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339int ust_consumer_destroy_channel(struct consumer_socket *socket,
340 struct ust_app_channel *ua_chan)
37278a1e 341{
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342 int ret;
343 struct lttcomm_consumer_msg msg;
a4b92340 344
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345 assert(ua_chan);
346 assert(socket);
37278a1e 347
53efb85a 348 memset(&msg, 0, sizeof(msg));
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349 msg.cmd_type = LTTNG_CONSUMER_DESTROY_CHANNEL;
350 msg.u.destroy_channel.key = ua_chan->key;
173af62f 351
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352 pthread_mutex_lock(socket->lock);
353 health_code_update();
37278a1e 354
ffe60014 355 ret = consumer_send_msg(socket, &msg);
37278a1e
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356 if (ret < 0) {
357 goto error;
48842b30
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358 }
359
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360error:
361 health_code_update();
362 pthread_mutex_unlock(socket->lock);
363 return ret;
364}
aeb96892 365
ffe60014
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366/*
367 * Send a given stream to UST tracer.
368 *
369 * On success return 0 else a negative value.
370 */
371int ust_consumer_send_stream_to_ust(struct ust_app *app,
372 struct ust_app_channel *channel, struct ust_app_stream *stream)
373{
374 int ret;
375
376 assert(app);
377 assert(stream);
378 assert(channel);
379
380 DBG2("UST consumer send stream to app %d", app->sock);
381
382 /* Relay stream to application. */
383 ret = ustctl_send_stream_to_ust(app->sock, channel->obj, stream->obj);
384 if (ret < 0) {
385 if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
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386 ERR("ustctl send stream handle %d to app pid: %d with ret %d",
387 stream->obj->handle, app->pid, ret);
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388 } else {
389 DBG3("UST app send stream to ust failed. Application is dead.");
48842b30 390 }
ffe60014 391 goto error;
48842b30 392 }
d0b96690 393 channel->handle = channel->obj->handle;
48842b30 394
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395error:
396 return ret;
397}
398
399/*
400 * Send channel previously received from the consumer to the UST tracer.
401 *
402 * On success return 0 else a negative value.
403 */
404int ust_consumer_send_channel_to_ust(struct ust_app *app,
405 struct ust_app_session *ua_sess, struct ust_app_channel *channel)
406{
407 int ret;
408
409 assert(app);
410 assert(ua_sess);
411 assert(channel);
412 assert(channel->obj);
413
7972aab2
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414 DBG2("UST app send channel to sock %d pid %d (name: %s, key: %" PRIu64 ")",
415 app->sock, app->pid, channel->name, channel->tracing_channel_id);
48842b30 416
ffe60014
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417 /* Send stream to application. */
418 ret = ustctl_send_channel_to_ust(app->sock, ua_sess->handle, channel->obj);
419 if (ret < 0) {
420 if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
421 ERR("Error ustctl send channel %s to app pid: %d with ret %d",
422 channel->name, app->pid, ret);
423 } else {
424 DBG3("UST app send channel to ust failed. Application is dead.");
425 }
426 goto error;
427 }
48842b30
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428
429error:
430 return ret;
431}
331744e3
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432
433/*
434 * Handle the metadata requests from the UST consumer
435 *
436 * Return 0 on success else a negative value.
437 */
438int ust_consumer_metadata_request(struct consumer_socket *socket)
439{
440 int ret;
441 ssize_t ret_push;
442 struct lttcomm_metadata_request_msg request;
443 struct buffer_reg_uid *reg_uid;
444 struct ust_registry_session *ust_reg;
445 struct lttcomm_consumer_msg msg;
446
447 assert(socket);
448
449 rcu_read_lock();
450 pthread_mutex_lock(socket->lock);
451
452 health_code_update();
453
454 /* Wait for a metadata request */
52898cb1
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455 ret = consumer_socket_recv(socket, &request, sizeof(request));
456 if (ret < 0) {
331744e3
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457 goto end;
458 }
459
1950109e 460 DBG("Metadata request received for session %" PRIu64 ", key %" PRIu64,
331744e3
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461 request.session_id, request.key);
462
463 reg_uid = buffer_reg_uid_find(request.session_id,
464 request.bits_per_long, request.uid);
465 if (reg_uid) {
466 ust_reg = reg_uid->registry->reg.ust;
467 } else {
468 struct buffer_reg_pid *reg_pid =
1950109e 469 buffer_reg_pid_find(request.session_id_per_pid);
331744e3 470 if (!reg_pid) {
1950109e
JD
471 DBG("PID registry not found for session id %" PRIu64,
472 request.session_id_per_pid);
331744e3 473
53efb85a 474 memset(&msg, 0, sizeof(msg));
331744e3
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475 msg.cmd_type = LTTNG_ERR_UND;
476 (void) consumer_send_msg(socket, &msg);
477 /*
478 * This is possible since the session might have been destroyed
479 * during a consumer metadata request. So here, return gracefully
480 * because the destroy session will push the remaining metadata to
481 * the consumer.
482 */
483 ret = 0;
484 goto end;
485 }
486 ust_reg = reg_pid->registry->reg.ust;
487 }
488 assert(ust_reg);
489
490 ret_push = ust_app_push_metadata(ust_reg, socket, 1);
491 if (ret_push < 0) {
492 ERR("Pushing metadata");
493 ret = -1;
494 goto end;
495 }
496 DBG("UST Consumer metadata pushed successfully");
497 ret = 0;
498
499end:
500 pthread_mutex_unlock(socket->lock);
501 rcu_read_unlock();
502 return ret;
503}
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