Create agent on channel creation
[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 {
116 struct agent *agt = trace_ust_find_agent(usess, domain);
117
118 if (!agt) {
119 agt = agent_create(domain);
120 if (!agt) {
121 ret = LTTNG_ERR_NOMEM;
122 goto error;
123 }
124 agent_add(agt, usess->agents);
125 }
126 ret = agent_add_context(ctx, agt);
127 if (ret != LTTNG_OK) {
128 goto error;
129 }
130
131 ret = agent_enable_context(ctx, domain);
132 if (ret != LTTNG_OK) {
133 goto error;
134 }
135 break;
136 }
137 case LTTNG_DOMAIN_UST:
138 break;
139 default:
140 assert(0);
141 }
aa3514e9 142
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143 /* Create ltt UST context */
144 uctx = trace_ust_create_context(ctx);
145 if (uctx == NULL) {
727d5404 146 ret = -EINVAL;
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147 goto error;
148 }
149
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150 ret = ust_app_add_ctx_channel_glb(usess, uchan, uctx);
151 if (ret < 0) {
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152 goto error;
153 }
154
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155 rcu_read_lock();
156
6b79ed20 157 /* Add ltt UST context node to ltt UST channel */
aa3514e9 158 lttng_ht_add_ulong(uchan->ctx, &uctx->node);
e7fe706f 159 rcu_read_unlock();
31746f93 160 cds_list_add_tail(&uctx->list, &uchan->ctx_list);
6b79ed20 161
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162 DBG("Context UST %d added to channel %s", uctx->ctx.ctx, uchan->name);
163
164 return 0;
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165
166error:
167 free(uctx);
aa3514e9 168duplicate:
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169 return ret;
170}
171
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172/*
173 * Add kernel context to tracer.
174 */
54d01ffb 175int context_kernel_add(struct ltt_kernel_session *ksession,
601d5acf 176 struct lttng_event_context *ctx, char *channel_name)
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177{
178 int ret;
179 struct ltt_kernel_channel *kchan;
645328ae 180 struct ltt_kernel_context *kctx;
54d01ffb 181
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182 assert(ksession);
183 assert(ctx);
184 assert(channel_name);
185
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186 kctx = trace_kernel_create_context(NULL);
187 if (!kctx) {
188 ret = LTTNG_ERR_NOMEM;
189 goto error;
190 }
191
54d01ffb 192 /* Setup kernel context structure */
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193 switch (ctx->ctx) {
194 case LTTNG_EVENT_CONTEXT_PID:
645328ae 195 kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_PID;
9197c5c4 196 break;
9197c5c4 197 case LTTNG_EVENT_CONTEXT_PROCNAME:
645328ae 198 kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_PROCNAME;
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199 break;
200 case LTTNG_EVENT_CONTEXT_PRIO:
645328ae 201 kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_PRIO;
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202 break;
203 case LTTNG_EVENT_CONTEXT_NICE:
645328ae 204 kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_NICE;
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205 break;
206 case LTTNG_EVENT_CONTEXT_VPID:
645328ae 207 kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_VPID;
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208 break;
209 case LTTNG_EVENT_CONTEXT_TID:
645328ae 210 kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_TID;
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211 break;
212 case LTTNG_EVENT_CONTEXT_VTID:
645328ae 213 kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_VTID;
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214 break;
215 case LTTNG_EVENT_CONTEXT_PPID:
645328ae 216 kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_PPID;
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MD
217 break;
218 case LTTNG_EVENT_CONTEXT_VPPID:
645328ae 219 kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_VPPID;
9197c5c4 220 break;
54773d68 221 case LTTNG_EVENT_CONTEXT_HOSTNAME:
645328ae 222 kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_HOSTNAME;
54773d68 223 break;
aa3514e9
MD
224 case LTTNG_EVENT_CONTEXT_PERF_CPU_COUNTER:
225 case LTTNG_EVENT_CONTEXT_PERF_COUNTER:
645328ae 226 kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_PERF_CPU_COUNTER;
aa3514e9 227 break;
9197c5c4 228 default:
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229 ret = LTTNG_ERR_KERN_CONTEXT_FAIL;
230 goto error;
9197c5c4
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231 }
232
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233 kctx->ctx.u.perf_counter.type = ctx->u.perf_counter.type;
234 kctx->ctx.u.perf_counter.config = ctx->u.perf_counter.config;
235 strncpy(kctx->ctx.u.perf_counter.name, ctx->u.perf_counter.name,
54d01ffb 236 LTTNG_SYMBOL_NAME_LEN);
645328ae 237 kctx->ctx.u.perf_counter.name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
b579acd9 238
9d035200 239 if (*channel_name == '\0') {
645328ae 240 ret = add_kctx_all_channels(ksession, kctx);
f73fabfd 241 if (ret != LTTNG_OK) {
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242 goto error;
243 }
244 } else {
245 /* Get kernel channel */
62499ad6 246 kchan = trace_kernel_get_channel_by_name(channel_name, ksession);
b579acd9 247 if (kchan == NULL) {
f73fabfd 248 ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND;
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249 goto error;
250 }
251
645328ae 252 ret = add_kctx_to_channel(kctx, kchan);
f73fabfd 253 if (ret != LTTNG_OK) {
b579acd9
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254 goto error;
255 }
256 }
257
fc7324e8 258 return LTTNG_OK;
b579acd9
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259
260error:
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261 if (kctx) {
262 trace_kernel_destroy_context(kctx);
263 }
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264 return ret;
265}
2bdd86d4
MD
266
267/*
55cc08a6 268 * Add UST context to tracer.
2bdd86d4 269 */
4ce7709b
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270int context_ust_add(struct ltt_ust_session *usess,
271 enum lttng_domain_type domain, struct lttng_event_context *ctx,
272 char *channel_name)
2bdd86d4 273{
601d5acf 274 int ret = LTTNG_OK;
442359c0 275 struct lttng_ht_iter iter;
bec39940 276 struct lttng_ht *chan_ht;
55cc08a6 277 struct ltt_ust_channel *uchan = NULL;
2bdd86d4 278
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279 assert(usess);
280 assert(ctx);
281 assert(channel_name);
282
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283 rcu_read_lock();
284
f5501dad 285 chan_ht = usess->domain_global.channels;
2bdd86d4 286
55cc08a6 287 /* Get UST channel if defined */
9f9ee9c9 288 if (channel_name[0] != '\0') {
55cc08a6
DG
289 uchan = trace_ust_find_channel_by_name(chan_ht, channel_name);
290 if (uchan == NULL) {
f73fabfd 291 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
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MD
292 goto error;
293 }
55cc08a6
DG
294 }
295
601d5acf
DG
296 if (uchan) {
297 /* Add ctx to channel */
6b79ed20 298 ret = add_uctx_to_channel(usess, domain, uchan, ctx);
601d5acf 299 } else {
e7fe706f 300 rcu_read_lock();
601d5acf 301 /* Add ctx all events, all channels */
bec39940 302 cds_lfht_for_each_entry(chan_ht->ht, &iter.iter, uchan, node.node) {
6b79ed20 303 ret = add_uctx_to_channel(usess, domain, uchan, ctx);
55cc08a6 304 if (ret < 0) {
9589be74
JG
305 ERR("Failed to add context to channel %s",
306 uchan->name);
55cc08a6
DG
307 continue;
308 }
2bdd86d4 309 }
e7fe706f 310 rcu_read_unlock();
55cc08a6 311 }
2bdd86d4 312
55cc08a6
DG
313 switch (ret) {
314 case -EEXIST:
f73fabfd 315 ret = LTTNG_ERR_UST_CONTEXT_EXIST;
727d5404 316 break;
55cc08a6 317 case -ENOMEM:
f73fabfd 318 ret = LTTNG_ERR_FATAL;
727d5404
DG
319 break;
320 case -EINVAL:
f73fabfd 321 ret = LTTNG_ERR_UST_CONTEXT_INVAL;
727d5404
DG
322 break;
323 case -ENOSYS:
f73fabfd 324 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
727d5404
DG
325 break;
326 default:
f73fabfd 327 ret = LTTNG_OK;
727d5404 328 break;
2bdd86d4
MD
329 }
330
2bdd86d4 331error:
2223c96f 332 rcu_read_unlock();
2bdd86d4
MD
333 return ret;
334}
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