Consumer daemon data available command support
[lttng-tools.git] / src / bin / lttng-sessiond / ust-consumer.c
CommitLineData
48842b30
DG
1/*
2 * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
3 *
d14d33bf
AM
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 *
d14d33bf
AM
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 *
d14d33bf
AM
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.
48842b30
DG
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>
24
990570ed 25#include <common/common.h>
db758600 26#include <common/consumer.h>
990570ed 27#include <common/defaults.h>
48842b30 28
00e2e675 29#include "consumer.h"
48842b30
DG
30#include "ust-consumer.h"
31
32/*
37278a1e 33 * Send a single channel to the consumer using command ADD_CHANNEL.
48842b30 34 */
37278a1e 35static int send_channel(int sock, struct ust_app_channel *uchan)
48842b30 36{
8010679a 37 int ret, fd;
37278a1e 38 struct lttcomm_consumer_msg msg;
48842b30 39
37278a1e
DG
40 /* Safety net */
41 assert(uchan);
42
43 if (sock < 0) {
44 ret = -EINVAL;
45 goto error;
46 }
48842b30 47
37278a1e
DG
48 DBG2("Sending channel %s to UST consumer", uchan->name);
49
50 consumer_init_channel_comm_msg(&msg,
00e2e675
DG
51 LTTNG_CONSUMER_ADD_CHANNEL,
52 uchan->obj->shm_fd,
53 uchan->attr.subbuf_size,
54 uchan->obj->memory_map_size,
c30aaa51
MD
55 uchan->name,
56 uchan->streams.count);
00e2e675 57
37278a1e 58 ret = consumer_send_channel(sock, &msg);
48842b30 59 if (ret < 0) {
48842b30
DG
60 goto error;
61 }
00e2e675 62
8010679a 63 fd = uchan->obj->shm_fd;
00e2e675 64 ret = consumer_send_fds(sock, &fd, 1);
48842b30 65 if (ret < 0) {
48842b30
DG
66 goto error;
67 }
68
37278a1e
DG
69error:
70 return ret;
71}
72
73/*
74 * Send a single stream to the consumer using ADD_STREAM command.
75 */
76static int send_channel_stream(int sock, struct ust_app_channel *uchan,
77 struct ust_app_session *usess, struct ltt_ust_stream *stream,
78 struct consumer_output *consumer, const char *pathname)
79{
80 int ret, fds[2];
81 struct lttcomm_consumer_msg msg;
82
83 /* Safety net */
84 assert(uchan);
85 assert(usess);
86 assert(stream);
87 assert(consumer);
88
89 DBG2("Sending stream %d of channel %s to kernel consumer",
90 stream->obj->shm_fd, uchan->name);
91
92 consumer_init_stream_comm_msg(&msg,
93 LTTNG_CONSUMER_ADD_STREAM,
94 uchan->obj->shm_fd,
95 stream->obj->shm_fd,
96 LTTNG_CONSUMER_ACTIVE_STREAM,
97 DEFAULT_UST_CHANNEL_OUTPUT,
98 stream->obj->memory_map_size,
99 usess->uid,
100 usess->gid,
101 consumer->net_seq_index,
102 0, /* Metadata flag unset */
103 stream->name,
ca22feea
DG
104 pathname,
105 usess->id);
37278a1e
DG
106
107 /* Send stream and file descriptor */
108 fds[0] = stream->obj->shm_fd;
109 fds[1] = stream->obj->wait_fd;
110 ret = consumer_send_stream(sock, consumer, &msg, fds, 2);
111 if (ret < 0) {
112 goto error;
113 }
114
115error:
116 return ret;
117}
118
119/*
120 * Send all stream fds of UST channel to the consumer.
121 */
173af62f 122static int send_channel_streams(int sock,
37278a1e
DG
123 struct ust_app_channel *uchan, struct ust_app_session *usess,
124 struct consumer_output *consumer)
125{
126 int ret;
127 char tmp_path[PATH_MAX];
128 const char *pathname;
129 struct ltt_ust_stream *stream, *tmp;
130
131 DBG("Sending streams of channel %s to UST consumer", uchan->name);
132
133 ret = send_channel(sock, uchan);
134 if (ret < 0) {
135 goto error;
136 }
137
00e2e675
DG
138 /* Get the right path name destination */
139 if (consumer->type == CONSUMER_DST_LOCAL) {
140 /* Set application path to the destination path */
a4b92340
DG
141 ret = snprintf(tmp_path, sizeof(tmp_path), "%s/%s/%s",
142 consumer->dst.trace_path, consumer->subdir, usess->path);
00e2e675
DG
143 if (ret < 0) {
144 PERROR("snprintf stream path");
145 goto error;
146 }
147 pathname = tmp_path;
148 DBG3("UST local consumer tracefile path: %s", pathname);
149 } else {
150 ret = snprintf(tmp_path, sizeof(tmp_path), "%s/%s",
37278a1e 151 consumer->subdir, usess->path);
00e2e675
DG
152 if (ret < 0) {
153 PERROR("snprintf stream path");
154 goto error;
155 }
156 pathname = tmp_path;
157 DBG3("UST network consumer subdir path: %s", pathname);
158 }
159
d80a6244 160 cds_list_for_each_entry_safe(stream, tmp, &uchan->streams.head, list) {
48842b30 161 if (!stream->obj->shm_fd) {
5af2f756 162 continue;
48842b30 163 }
48842b30 164
37278a1e 165 ret = send_channel_stream(sock, uchan, usess, stream, consumer,
00e2e675 166 pathname);
48842b30 167 if (ret < 0) {
48842b30
DG
168 goto error;
169 }
48842b30 170 }
48842b30 171
00e2e675 172 DBG("UST consumer channel streams sent");
48842b30
DG
173
174 return 0;
175
176error:
177 return ret;
178}
179
180/*
37278a1e 181 * Sending metadata to the consumer with command ADD_CHANNEL and ADD_STREAM.
48842b30 182 */
173af62f 183static int send_metadata(int sock, struct ust_app_session *usess,
00e2e675 184 struct consumer_output *consumer)
48842b30 185{
37278a1e 186 int ret, fd, fds[2];
00e2e675
DG
187 char tmp_path[PATH_MAX];
188 const char *pathname;
37278a1e 189 struct lttcomm_consumer_msg msg;
48842b30 190
37278a1e
DG
191 /* Safety net */
192 assert(usess);
193 assert(consumer);
48842b30 194
37278a1e
DG
195 if (sock < 0) {
196 ERR("Consumer socket is negative (%d)", sock);
7753dea8
MD
197 return -EINVAL;
198 }
199
37278a1e
DG
200 if (usess->metadata->obj->shm_fd == 0) {
201 ERR("Metadata obj shm_fd is 0");
202 ret = -1;
203 goto error;
204 }
48842b30 205
37278a1e 206 DBG("UST consumer sending metadata stream fd");
00e2e675 207
37278a1e
DG
208 consumer_init_channel_comm_msg(&msg,
209 LTTNG_CONSUMER_ADD_CHANNEL,
210 usess->metadata->obj->shm_fd,
211 usess->metadata->attr.subbuf_size,
212 usess->metadata->obj->memory_map_size,
c30aaa51
MD
213 "metadata",
214 1);
37278a1e
DG
215
216 ret = consumer_send_channel(sock, &msg);
217 if (ret < 0) {
218 goto error;
219 }
220
221 /* Sending metadata shared memory fd */
222 fd = usess->metadata->obj->shm_fd;
223 ret = consumer_send_fds(sock, &fd, 1);
224 if (ret < 0) {
225 goto error;
226 }
00e2e675 227
37278a1e
DG
228 /* Get correct path name destination */
229 if (consumer->type == CONSUMER_DST_LOCAL) {
230 /* Set application path to the destination path */
a4b92340
DG
231 ret = snprintf(tmp_path, sizeof(tmp_path), "%s/%s/%s",
232 consumer->dst.trace_path, consumer->subdir, usess->path);
48842b30 233 if (ret < 0) {
37278a1e 234 PERROR("snprintf stream path");
48842b30
DG
235 goto error;
236 }
37278a1e 237 pathname = tmp_path;
48842b30 238
37278a1e
DG
239 /* Create directory */
240 ret = run_as_mkdir_recursive(pathname, S_IRWXU | S_IRWXG,
241 usess->uid, usess->gid);
242 if (ret < 0) {
243 if (ret != -EEXIST) {
244 ERR("Trace directory creation error");
00e2e675
DG
245 goto error;
246 }
48842b30 247 }
37278a1e
DG
248 } else {
249 ret = snprintf(tmp_path, sizeof(tmp_path), "%s/%s",
250 consumer->subdir, usess->path);
48842b30 251 if (ret < 0) {
37278a1e 252 PERROR("snprintf metadata path");
48842b30
DG
253 goto error;
254 }
37278a1e
DG
255 pathname = tmp_path;
256 }
257
258 consumer_init_stream_comm_msg(&msg,
259 LTTNG_CONSUMER_ADD_STREAM,
260 usess->metadata->obj->shm_fd,
261 usess->metadata->stream_obj->shm_fd,
262 LTTNG_CONSUMER_ACTIVE_STREAM,
263 DEFAULT_UST_CHANNEL_OUTPUT,
264 usess->metadata->stream_obj->memory_map_size,
265 usess->uid,
266 usess->gid,
267 consumer->net_seq_index,
268 1, /* Flag metadata set */
269 "metadata",
ca22feea
DG
270 pathname,
271 usess->id);
37278a1e
DG
272
273 /* Send stream and file descriptor */
274 fds[0] = usess->metadata->stream_obj->shm_fd;
275 fds[1] = usess->metadata->stream_obj->wait_fd;
276 ret = consumer_send_stream(sock, consumer, &msg, fds, 2);
277 if (ret < 0) {
278 goto error;
279 }
280
281error:
282 return ret;
283}
284
285/*
286 * Send all stream fds of the UST session to the consumer.
287 */
173af62f
DG
288int ust_consumer_send_session(struct ust_app_session *usess,
289 struct consumer_output *consumer, struct consumer_socket *sock)
37278a1e
DG
290{
291 int ret = 0;
37278a1e
DG
292 struct lttng_ht_iter iter;
293 struct ust_app_channel *ua_chan;
294
173af62f 295 assert(usess);
a4b92340
DG
296
297 if (consumer == NULL || sock == NULL) {
298 /* There is no consumer so just ignoring the command. */
299 DBG("UST consumer does not exist. Not sending streams");
300 return 0;
301 }
37278a1e 302
173af62f
DG
303 DBG("Sending metadata stream fd to consumer on %d", sock->fd);
304
305 pthread_mutex_lock(sock->lock);
37278a1e
DG
306
307 /* Sending metadata information to the consumer */
173af62f 308 ret = send_metadata(sock->fd, usess, consumer);
37278a1e
DG
309 if (ret < 0) {
310 goto error;
48842b30
DG
311 }
312
313 /* Send each channel fd streams of session */
314 rcu_read_lock();
bec39940
DG
315 cds_lfht_for_each_entry(usess->channels->ht, &iter.iter, ua_chan,
316 node.node) {
aeb96892
DG
317 /*
318 * Indicate that the channel was not created on the tracer side so skip
319 * sending unexisting streams.
320 */
321 if (ua_chan->obj == NULL) {
322 continue;
323 }
324
173af62f 325 ret = send_channel_streams(sock->fd, ua_chan, usess, consumer);
48842b30 326 if (ret < 0) {
5485f822 327 rcu_read_unlock();
48842b30
DG
328 goto error;
329 }
48842b30
DG
330 }
331 rcu_read_unlock();
332
333 DBG("consumer fds (metadata and channel streams) sent");
334
173af62f
DG
335 /* All good! */
336 ret = 0;
48842b30
DG
337
338error:
173af62f 339 pthread_mutex_unlock(sock->lock);
48842b30
DG
340 return ret;
341}
This page took 0.070985 seconds and 4 git commands to generate.