Fix: Don't notify agent of non-app context addition
[lttng-tools.git] / src / bin / lttng-sessiond / context.c
CommitLineData
b579acd9 1/*
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2 * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
3 * Copyright (C) 2016 - Jérémie Galarneau <jeremie.galarneau@efficios.com>
b579acd9 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.
b579acd9 8 *
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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.
b579acd9 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
6c1c0768 19#define _LGPL_SOURCE
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20#include <stdio.h>
21#include <stdlib.h>
22#include <string.h>
23#include <unistd.h>
54d01ffb 24#include <urcu/list.h>
1e307fab 25
db758600 26#include <common/error.h>
10a8a223 27#include <common/sessiond-comm/sessiond-comm.h>
b579acd9 28
b579acd9 29#include "context.h"
4771f025 30#include "kernel.h"
55cc08a6 31#include "ust-app.h"
34378f76 32#include "trace-ust.h"
bdf64013 33#include "agent.h"
b579acd9 34
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35/*
36 * Add kernel context to all channel.
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37 */
38static int add_kctx_all_channels(struct ltt_kernel_session *ksession,
645328ae 39 struct ltt_kernel_context *kctx)
b579acd9 40{
601d5acf 41 int ret;
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42 struct ltt_kernel_channel *kchan;
43
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44 assert(ksession);
45 assert(kctx);
46
601d5acf 47 DBG("Adding kernel context to all channels");
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48
49 /* Go over all channels */
50 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
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51 ret = kernel_add_channel_context(kchan, kctx);
52 if (ret < 0) {
53 ret = LTTNG_ERR_KERN_CONTEXT_FAIL;
54 goto error;
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55 }
56 }
57
f73fabfd 58 ret = LTTNG_OK;
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59
60error:
61 return ret;
62}
63
64/*
65 * Add kernel context to a specific channel.
b579acd9 66 */
645328ae 67static int add_kctx_to_channel(struct ltt_kernel_context *kctx,
601d5acf 68 struct ltt_kernel_channel *kchan)
b579acd9 69{
601d5acf 70 int ret;
b579acd9 71
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72 assert(kchan);
73 assert(kctx);
74
601d5acf 75 DBG("Add kernel context to channel '%s'", kchan->channel->name);
b579acd9 76
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77 ret = kernel_add_channel_context(kchan, kctx);
78 if (ret < 0) {
79 ret = LTTNG_ERR_KERN_CONTEXT_FAIL;
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80 goto error;
81 }
82
f73fabfd 83 ret = LTTNG_OK;
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84
85error:
86 return ret;
87}
88
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89/*
90 * Add UST context to channel.
91 */
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92static int add_uctx_to_channel(struct ltt_ust_session *usess,
93 enum lttng_domain_type domain,
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94 struct ltt_ust_channel *uchan, struct lttng_event_context *ctx)
95{
96 int ret;
bdf64013 97 struct ltt_ust_context *uctx = NULL;
6b79ed20 98
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99 assert(usess);
100 assert(uchan);
101 assert(ctx);
102
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103 /* Check if context is duplicate */
104 cds_list_for_each_entry(uctx, &uchan->ctx_list, list) {
105 if (trace_ust_match_context(uctx, ctx)) {
106 ret = -EEXIST;
107 goto duplicate;
108 }
109 }
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110 uctx = NULL;
111
112 switch (domain) {
113 case LTTNG_DOMAIN_JUL:
114 case LTTNG_DOMAIN_LOG4J:
115 {
442f8c07
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116 struct agent *agt;
117
118 if (ctx->ctx != LTTNG_EVENT_CONTEXT_APP_CONTEXT) {
119 /* Other contexts are not needed by the agent. */
120 break;
121 }
122 agt = trace_ust_find_agent(usess, domain);
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123
124 if (!agt) {
125 agt = agent_create(domain);
126 if (!agt) {
127 ret = LTTNG_ERR_NOMEM;
128 goto error;
129 }
130 agent_add(agt, usess->agents);
131 }
132 ret = agent_add_context(ctx, agt);
133 if (ret != LTTNG_OK) {
134 goto error;
135 }
136
137 ret = agent_enable_context(ctx, domain);
138 if (ret != LTTNG_OK) {
139 goto error;
140 }
141 break;
142 }
143 case LTTNG_DOMAIN_UST:
144 break;
145 default:
146 assert(0);
147 }
aa3514e9 148
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149 /* Create ltt UST context */
150 uctx = trace_ust_create_context(ctx);
151 if (uctx == NULL) {
727d5404 152 ret = -EINVAL;
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153 goto error;
154 }
155
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156 ret = ust_app_add_ctx_channel_glb(usess, uchan, uctx);
157 if (ret < 0) {
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158 goto error;
159 }
160
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161 rcu_read_lock();
162
6b79ed20 163 /* Add ltt UST context node to ltt UST channel */
aa3514e9 164 lttng_ht_add_ulong(uchan->ctx, &uctx->node);
e7fe706f 165 rcu_read_unlock();
31746f93 166 cds_list_add_tail(&uctx->list, &uchan->ctx_list);
6b79ed20 167
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168 DBG("Context UST %d added to channel %s", uctx->ctx.ctx, uchan->name);
169
170 return 0;
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171
172error:
173 free(uctx);
aa3514e9 174duplicate:
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175 return ret;
176}
177
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178/*
179 * Add kernel context to tracer.
180 */
54d01ffb 181int context_kernel_add(struct ltt_kernel_session *ksession,
601d5acf 182 struct lttng_event_context *ctx, char *channel_name)
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183{
184 int ret;
185 struct ltt_kernel_channel *kchan;
645328ae 186 struct ltt_kernel_context *kctx;
54d01ffb 187
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188 assert(ksession);
189 assert(ctx);
190 assert(channel_name);
191
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192 kctx = trace_kernel_create_context(NULL);
193 if (!kctx) {
194 ret = LTTNG_ERR_NOMEM;
195 goto error;
196 }
197
54d01ffb 198 /* Setup kernel context structure */
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199 switch (ctx->ctx) {
200 case LTTNG_EVENT_CONTEXT_PID:
645328ae 201 kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_PID;
9197c5c4 202 break;
9197c5c4 203 case LTTNG_EVENT_CONTEXT_PROCNAME:
645328ae 204 kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_PROCNAME;
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205 break;
206 case LTTNG_EVENT_CONTEXT_PRIO:
645328ae 207 kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_PRIO;
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208 break;
209 case LTTNG_EVENT_CONTEXT_NICE:
645328ae 210 kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_NICE;
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211 break;
212 case LTTNG_EVENT_CONTEXT_VPID:
645328ae 213 kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_VPID;
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214 break;
215 case LTTNG_EVENT_CONTEXT_TID:
645328ae 216 kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_TID;
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217 break;
218 case LTTNG_EVENT_CONTEXT_VTID:
645328ae 219 kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_VTID;
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220 break;
221 case LTTNG_EVENT_CONTEXT_PPID:
645328ae 222 kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_PPID;
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223 break;
224 case LTTNG_EVENT_CONTEXT_VPPID:
645328ae 225 kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_VPPID;
9197c5c4 226 break;
54773d68 227 case LTTNG_EVENT_CONTEXT_HOSTNAME:
645328ae 228 kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_HOSTNAME;
54773d68 229 break;
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230 case LTTNG_EVENT_CONTEXT_PERF_CPU_COUNTER:
231 case LTTNG_EVENT_CONTEXT_PERF_COUNTER:
645328ae 232 kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_PERF_CPU_COUNTER;
aa3514e9 233 break;
9197c5c4 234 default:
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235 ret = LTTNG_ERR_KERN_CONTEXT_FAIL;
236 goto error;
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237 }
238
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239 kctx->ctx.u.perf_counter.type = ctx->u.perf_counter.type;
240 kctx->ctx.u.perf_counter.config = ctx->u.perf_counter.config;
241 strncpy(kctx->ctx.u.perf_counter.name, ctx->u.perf_counter.name,
54d01ffb 242 LTTNG_SYMBOL_NAME_LEN);
645328ae 243 kctx->ctx.u.perf_counter.name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
b579acd9 244
9d035200 245 if (*channel_name == '\0') {
645328ae 246 ret = add_kctx_all_channels(ksession, kctx);
f73fabfd 247 if (ret != LTTNG_OK) {
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248 goto error;
249 }
250 } else {
251 /* Get kernel channel */
62499ad6 252 kchan = trace_kernel_get_channel_by_name(channel_name, ksession);
b579acd9 253 if (kchan == NULL) {
f73fabfd 254 ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND;
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255 goto error;
256 }
257
645328ae 258 ret = add_kctx_to_channel(kctx, kchan);
f73fabfd 259 if (ret != LTTNG_OK) {
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260 goto error;
261 }
262 }
263
fc7324e8 264 return LTTNG_OK;
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265
266error:
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267 if (kctx) {
268 trace_kernel_destroy_context(kctx);
269 }
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270 return ret;
271}
2bdd86d4
MD
272
273/*
55cc08a6 274 * Add UST context to tracer.
2bdd86d4 275 */
4ce7709b
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276int context_ust_add(struct ltt_ust_session *usess,
277 enum lttng_domain_type domain, struct lttng_event_context *ctx,
278 char *channel_name)
2bdd86d4 279{
601d5acf 280 int ret = LTTNG_OK;
442359c0 281 struct lttng_ht_iter iter;
bec39940 282 struct lttng_ht *chan_ht;
55cc08a6 283 struct ltt_ust_channel *uchan = NULL;
2bdd86d4 284
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285 assert(usess);
286 assert(ctx);
287 assert(channel_name);
288
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289 rcu_read_lock();
290
f5501dad 291 chan_ht = usess->domain_global.channels;
2bdd86d4 292
55cc08a6 293 /* Get UST channel if defined */
9f9ee9c9 294 if (channel_name[0] != '\0') {
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DG
295 uchan = trace_ust_find_channel_by_name(chan_ht, channel_name);
296 if (uchan == NULL) {
f73fabfd 297 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
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298 goto error;
299 }
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300 }
301
601d5acf
DG
302 if (uchan) {
303 /* Add ctx to channel */
6b79ed20 304 ret = add_uctx_to_channel(usess, domain, uchan, ctx);
601d5acf 305 } else {
e7fe706f 306 rcu_read_lock();
601d5acf 307 /* Add ctx all events, all channels */
bec39940 308 cds_lfht_for_each_entry(chan_ht->ht, &iter.iter, uchan, node.node) {
6b79ed20 309 ret = add_uctx_to_channel(usess, domain, uchan, ctx);
55cc08a6 310 if (ret < 0) {
9589be74
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311 ERR("Failed to add context to channel %s",
312 uchan->name);
55cc08a6
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313 continue;
314 }
2bdd86d4 315 }
e7fe706f 316 rcu_read_unlock();
55cc08a6 317 }
2bdd86d4 318
55cc08a6
DG
319 switch (ret) {
320 case -EEXIST:
f73fabfd 321 ret = LTTNG_ERR_UST_CONTEXT_EXIST;
727d5404 322 break;
55cc08a6 323 case -ENOMEM:
f73fabfd 324 ret = LTTNG_ERR_FATAL;
727d5404
DG
325 break;
326 case -EINVAL:
f73fabfd 327 ret = LTTNG_ERR_UST_CONTEXT_INVAL;
727d5404
DG
328 break;
329 case -ENOSYS:
f73fabfd 330 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
727d5404
DG
331 break;
332 default:
f73fabfd 333 ret = LTTNG_OK;
727d5404 334 break;
2bdd86d4
MD
335 }
336
2bdd86d4 337error:
2223c96f 338 rcu_read_unlock();
2bdd86d4
MD
339 return ret;
340}
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