Fix: relayd metadata size
[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>
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"
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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
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40 /* Safety net */
41 assert(uchan);
42
43 if (sock < 0) {
44 ret = -EINVAL;
45 goto error;
46 }
48842b30 47
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48 DBG2("Sending channel %s to UST consumer", uchan->name);
49
50 consumer_init_channel_comm_msg(&msg,
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51 LTTNG_CONSUMER_ADD_CHANNEL,
52 uchan->obj->shm_fd,
53 uchan->attr.subbuf_size,
54 uchan->obj->memory_map_size,
55 uchan->name);
56
37278a1e 57 ret = consumer_send_channel(sock, &msg);
48842b30 58 if (ret < 0) {
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59 goto error;
60 }
00e2e675 61
8010679a 62 fd = uchan->obj->shm_fd;
00e2e675 63 ret = consumer_send_fds(sock, &fd, 1);
48842b30 64 if (ret < 0) {
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65 goto error;
66 }
67
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68error:
69 return ret;
70}
71
72/*
73 * Send a single stream to the consumer using ADD_STREAM command.
74 */
75static int send_channel_stream(int sock, struct ust_app_channel *uchan,
76 struct ust_app_session *usess, struct ltt_ust_stream *stream,
77 struct consumer_output *consumer, const char *pathname)
78{
79 int ret, fds[2];
80 struct lttcomm_consumer_msg msg;
81
82 /* Safety net */
83 assert(uchan);
84 assert(usess);
85 assert(stream);
86 assert(consumer);
87
88 DBG2("Sending stream %d of channel %s to kernel consumer",
89 stream->obj->shm_fd, uchan->name);
90
91 consumer_init_stream_comm_msg(&msg,
92 LTTNG_CONSUMER_ADD_STREAM,
93 uchan->obj->shm_fd,
94 stream->obj->shm_fd,
95 LTTNG_CONSUMER_ACTIVE_STREAM,
96 DEFAULT_UST_CHANNEL_OUTPUT,
97 stream->obj->memory_map_size,
98 usess->uid,
99 usess->gid,
100 consumer->net_seq_index,
101 0, /* Metadata flag unset */
102 stream->name,
103 pathname);
104
105 /* Send stream and file descriptor */
106 fds[0] = stream->obj->shm_fd;
107 fds[1] = stream->obj->wait_fd;
108 ret = consumer_send_stream(sock, consumer, &msg, fds, 2);
109 if (ret < 0) {
110 goto error;
111 }
112
113error:
114 return ret;
115}
116
117/*
118 * Send all stream fds of UST channel to the consumer.
119 */
120int ust_consumer_send_channel_streams(int sock,
121 struct ust_app_channel *uchan, struct ust_app_session *usess,
122 struct consumer_output *consumer)
123{
124 int ret;
125 char tmp_path[PATH_MAX];
126 const char *pathname;
127 struct ltt_ust_stream *stream, *tmp;
128
129 DBG("Sending streams of channel %s to UST consumer", uchan->name);
130
131 ret = send_channel(sock, uchan);
132 if (ret < 0) {
133 goto error;
134 }
135
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136 /* Get the right path name destination */
137 if (consumer->type == CONSUMER_DST_LOCAL) {
138 /* Set application path to the destination path */
139 ret = snprintf(tmp_path, sizeof(tmp_path), "%s/%s",
37278a1e 140 consumer->dst.trace_path, usess->path);
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141 if (ret < 0) {
142 PERROR("snprintf stream path");
143 goto error;
144 }
145 pathname = tmp_path;
146 DBG3("UST local consumer tracefile path: %s", pathname);
147 } else {
148 ret = snprintf(tmp_path, sizeof(tmp_path), "%s/%s",
37278a1e 149 consumer->subdir, usess->path);
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150 if (ret < 0) {
151 PERROR("snprintf stream path");
152 goto error;
153 }
154 pathname = tmp_path;
155 DBG3("UST network consumer subdir path: %s", pathname);
156 }
157
d80a6244 158 cds_list_for_each_entry_safe(stream, tmp, &uchan->streams.head, list) {
48842b30 159 if (!stream->obj->shm_fd) {
5af2f756 160 continue;
48842b30 161 }
48842b30 162
37278a1e 163 ret = send_channel_stream(sock, uchan, usess, stream, consumer,
00e2e675 164 pathname);
48842b30 165 if (ret < 0) {
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166 goto error;
167 }
48842b30 168 }
48842b30 169
00e2e675 170 DBG("UST consumer channel streams sent");
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171
172 return 0;
173
174error:
175 return ret;
176}
177
178/*
37278a1e 179 * Sending metadata to the consumer with command ADD_CHANNEL and ADD_STREAM.
48842b30 180 */
37278a1e 181int ust_consumer_send_metadata(int sock, struct ust_app_session *usess,
00e2e675 182 struct consumer_output *consumer)
48842b30 183{
37278a1e 184 int ret, fd, fds[2];
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185 char tmp_path[PATH_MAX];
186 const char *pathname;
37278a1e 187 struct lttcomm_consumer_msg msg;
48842b30 188
37278a1e
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189 /* Safety net */
190 assert(usess);
191 assert(consumer);
48842b30 192
37278a1e
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193 if (sock < 0) {
194 ERR("Consumer socket is negative (%d)", sock);
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195 return -EINVAL;
196 }
197
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198 if (usess->metadata->obj->shm_fd == 0) {
199 ERR("Metadata obj shm_fd is 0");
200 ret = -1;
201 goto error;
202 }
48842b30 203
37278a1e 204 DBG("UST consumer sending metadata stream fd");
00e2e675 205
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206 consumer_init_channel_comm_msg(&msg,
207 LTTNG_CONSUMER_ADD_CHANNEL,
208 usess->metadata->obj->shm_fd,
209 usess->metadata->attr.subbuf_size,
210 usess->metadata->obj->memory_map_size,
211 "metadata");
212
213 ret = consumer_send_channel(sock, &msg);
214 if (ret < 0) {
215 goto error;
216 }
217
218 /* Sending metadata shared memory fd */
219 fd = usess->metadata->obj->shm_fd;
220 ret = consumer_send_fds(sock, &fd, 1);
221 if (ret < 0) {
222 goto error;
223 }
00e2e675 224
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225 /* Get correct path name destination */
226 if (consumer->type == CONSUMER_DST_LOCAL) {
227 /* Set application path to the destination path */
228 ret = snprintf(tmp_path, sizeof(tmp_path), "%s/%s",
229 consumer->dst.trace_path, usess->path);
48842b30 230 if (ret < 0) {
37278a1e 231 PERROR("snprintf stream path");
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232 goto error;
233 }
37278a1e 234 pathname = tmp_path;
48842b30 235
37278a1e
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236 /* Create directory */
237 ret = run_as_mkdir_recursive(pathname, S_IRWXU | S_IRWXG,
238 usess->uid, usess->gid);
239 if (ret < 0) {
240 if (ret != -EEXIST) {
241 ERR("Trace directory creation error");
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242 goto error;
243 }
48842b30 244 }
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245 } else {
246 ret = snprintf(tmp_path, sizeof(tmp_path), "%s/%s",
247 consumer->subdir, usess->path);
48842b30 248 if (ret < 0) {
37278a1e 249 PERROR("snprintf metadata path");
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250 goto error;
251 }
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252 pathname = tmp_path;
253 }
254
255 consumer_init_stream_comm_msg(&msg,
256 LTTNG_CONSUMER_ADD_STREAM,
257 usess->metadata->obj->shm_fd,
258 usess->metadata->stream_obj->shm_fd,
259 LTTNG_CONSUMER_ACTIVE_STREAM,
260 DEFAULT_UST_CHANNEL_OUTPUT,
261 usess->metadata->stream_obj->memory_map_size,
262 usess->uid,
263 usess->gid,
264 consumer->net_seq_index,
265 1, /* Flag metadata set */
266 "metadata",
267 pathname);
268
269 /* Send stream and file descriptor */
270 fds[0] = usess->metadata->stream_obj->shm_fd;
271 fds[1] = usess->metadata->stream_obj->wait_fd;
272 ret = consumer_send_stream(sock, consumer, &msg, fds, 2);
273 if (ret < 0) {
274 goto error;
275 }
276
277error:
278 return ret;
279}
280
281/*
282 * Send all stream fds of the UST session to the consumer.
283 */
284int ust_consumer_send_session(int consumer_fd, struct ust_app_session *usess,
285 struct consumer_output *consumer)
286{
287 int ret = 0;
288 int sock = consumer_fd;
289 struct lttng_ht_iter iter;
290 struct ust_app_channel *ua_chan;
291
292 DBG("Sending metadata stream fd");
293
294 if (consumer_fd < 0) {
295 ERR("Consumer has negative file descriptor");
296 return -EINVAL;
297 }
298
299 /* Sending metadata information to the consumer */
300 ret = ust_consumer_send_metadata(consumer_fd, usess, consumer);
301 if (ret < 0) {
302 goto error;
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303 }
304
305 /* Send each channel fd streams of session */
306 rcu_read_lock();
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307 cds_lfht_for_each_entry(usess->channels->ht, &iter.iter, ua_chan,
308 node.node) {
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309 /*
310 * Indicate that the channel was not created on the tracer side so skip
311 * sending unexisting streams.
312 */
313 if (ua_chan->obj == NULL) {
314 continue;
315 }
316
37278a1e 317 ret = ust_consumer_send_channel_streams(sock, ua_chan, usess, consumer);
48842b30 318 if (ret < 0) {
5485f822 319 rcu_read_unlock();
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320 goto error;
321 }
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322 }
323 rcu_read_unlock();
324
325 DBG("consumer fds (metadata and channel streams) sent");
326
327 return 0;
328
329error:
330 return ret;
331}
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