Fix: uninitialized return value on error path
[lttng-tools.git] / src / bin / lttng-sessiond / context.c
CommitLineData
b579acd9 1/*
bdf64013
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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 *
d14d33bf
AM
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 *
d14d33bf
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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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DG
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 *
38 * Assumes the ownership of kctx.
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39 */
40static int add_kctx_all_channels(struct ltt_kernel_session *ksession,
645328ae 41 struct ltt_kernel_context *kctx)
b579acd9 42{
601d5acf 43 int ret;
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44 struct ltt_kernel_channel *kchan;
45
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46 assert(ksession);
47 assert(kctx);
48
601d5acf 49 DBG("Adding kernel context to all channels");
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50
51 /* Go over all channels */
52 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
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53 struct ltt_kernel_context *kctx_copy;
54
55 kctx_copy = trace_kernel_copy_context(kctx);
56 if (!kctx_copy) {
57 PERROR("zmalloc ltt_kernel_context");
8145abcf 58 ret = -ENOMEM;
df3c77c8
JG
59 goto error;
60 }
61
62 /* Ownership of kctx_copy is transferred to the callee. */
63 ret = kernel_add_channel_context(kchan, kctx_copy);
64 kctx_copy = NULL;
1ae5e83e 65 if (ret != 0) {
601d5acf 66 goto error;
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67 }
68 }
69
f73fabfd 70 ret = LTTNG_OK;
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71
72error:
df3c77c8 73 trace_kernel_destroy_context(kctx);
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74 return ret;
75}
76
77/*
78 * Add kernel context to a specific channel.
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79 *
80 * Assumes the ownership of kctx.
b579acd9 81 */
645328ae 82static int add_kctx_to_channel(struct ltt_kernel_context *kctx,
601d5acf 83 struct ltt_kernel_channel *kchan)
b579acd9 84{
601d5acf 85 int ret;
b579acd9 86
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87 assert(kchan);
88 assert(kctx);
89
601d5acf 90 DBG("Add kernel context to channel '%s'", kchan->channel->name);
b579acd9 91
df3c77c8 92 /* Ownership of kctx is transferred to the callee. */
601d5acf 93 ret = kernel_add_channel_context(kchan, kctx);
df3c77c8 94 kctx = NULL;
1ae5e83e 95 if (ret != 0) {
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96 goto error;
97 }
98
f73fabfd 99 ret = LTTNG_OK;
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100
101error:
102 return ret;
103}
104
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105/*
106 * Add UST context to channel.
107 */
4ce7709b
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108static int add_uctx_to_channel(struct ltt_ust_session *usess,
109 enum lttng_domain_type domain,
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110 struct ltt_ust_channel *uchan, struct lttng_event_context *ctx)
111{
112 int ret;
bdf64013 113 struct ltt_ust_context *uctx = NULL;
6b79ed20 114
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115 assert(usess);
116 assert(uchan);
117 assert(ctx);
118
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119 /* Check if context is duplicate */
120 cds_list_for_each_entry(uctx, &uchan->ctx_list, list) {
121 if (trace_ust_match_context(uctx, ctx)) {
122 ret = -EEXIST;
123 goto duplicate;
124 }
125 }
bdf64013
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126 uctx = NULL;
127
128 switch (domain) {
129 case LTTNG_DOMAIN_JUL:
130 case LTTNG_DOMAIN_LOG4J:
131 {
442f8c07
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132 struct agent *agt;
133
134 if (ctx->ctx != LTTNG_EVENT_CONTEXT_APP_CONTEXT) {
135 /* Other contexts are not needed by the agent. */
136 break;
137 }
138 agt = trace_ust_find_agent(usess, domain);
bdf64013
JG
139
140 if (!agt) {
141 agt = agent_create(domain);
142 if (!agt) {
143 ret = LTTNG_ERR_NOMEM;
144 goto error;
145 }
146 agent_add(agt, usess->agents);
147 }
148 ret = agent_add_context(ctx, agt);
149 if (ret != LTTNG_OK) {
150 goto error;
151 }
152
153 ret = agent_enable_context(ctx, domain);
154 if (ret != LTTNG_OK) {
155 goto error;
156 }
157 break;
158 }
159 case LTTNG_DOMAIN_UST:
160 break;
161 default:
162 assert(0);
163 }
aa3514e9 164
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165 /* Create ltt UST context */
166 uctx = trace_ust_create_context(ctx);
167 if (uctx == NULL) {
727d5404 168 ret = -EINVAL;
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169 goto error;
170 }
171
c0c66aec
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172 ret = ust_app_add_ctx_channel_glb(usess, uchan, uctx);
173 if (ret < 0) {
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174 goto error;
175 }
176
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177 rcu_read_lock();
178
6b79ed20 179 /* Add ltt UST context node to ltt UST channel */
aa3514e9 180 lttng_ht_add_ulong(uchan->ctx, &uctx->node);
e7fe706f 181 rcu_read_unlock();
31746f93 182 cds_list_add_tail(&uctx->list, &uchan->ctx_list);
6b79ed20 183
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DG
184 DBG("Context UST %d added to channel %s", uctx->ctx.ctx, uchan->name);
185
186 return 0;
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187
188error:
189 free(uctx);
aa3514e9 190duplicate:
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191 return ret;
192}
193
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194/*
195 * Add kernel context to tracer.
196 */
54d01ffb 197int context_kernel_add(struct ltt_kernel_session *ksession,
601d5acf 198 struct lttng_event_context *ctx, char *channel_name)
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DG
199{
200 int ret;
201 struct ltt_kernel_channel *kchan;
645328ae 202 struct ltt_kernel_context *kctx;
54d01ffb 203
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204 assert(ksession);
205 assert(ctx);
206 assert(channel_name);
207
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DG
208 kctx = trace_kernel_create_context(NULL);
209 if (!kctx) {
210 ret = LTTNG_ERR_NOMEM;
211 goto error;
212 }
213
54d01ffb 214 /* Setup kernel context structure */
9197c5c4
MD
215 switch (ctx->ctx) {
216 case LTTNG_EVENT_CONTEXT_PID:
645328ae 217 kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_PID;
9197c5c4 218 break;
9197c5c4 219 case LTTNG_EVENT_CONTEXT_PROCNAME:
645328ae 220 kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_PROCNAME;
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MD
221 break;
222 case LTTNG_EVENT_CONTEXT_PRIO:
645328ae 223 kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_PRIO;
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MD
224 break;
225 case LTTNG_EVENT_CONTEXT_NICE:
645328ae 226 kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_NICE;
9197c5c4
MD
227 break;
228 case LTTNG_EVENT_CONTEXT_VPID:
645328ae 229 kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_VPID;
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230 break;
231 case LTTNG_EVENT_CONTEXT_TID:
645328ae 232 kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_TID;
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233 break;
234 case LTTNG_EVENT_CONTEXT_VTID:
645328ae 235 kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_VTID;
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MD
236 break;
237 case LTTNG_EVENT_CONTEXT_PPID:
645328ae 238 kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_PPID;
9197c5c4
MD
239 break;
240 case LTTNG_EVENT_CONTEXT_VPPID:
645328ae 241 kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_VPPID;
9197c5c4 242 break;
54773d68 243 case LTTNG_EVENT_CONTEXT_HOSTNAME:
645328ae 244 kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_HOSTNAME;
54773d68 245 break;
aa3514e9
MD
246 case LTTNG_EVENT_CONTEXT_PERF_CPU_COUNTER:
247 case LTTNG_EVENT_CONTEXT_PERF_COUNTER:
645328ae 248 kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_PERF_CPU_COUNTER;
aa3514e9 249 break;
1ae5e83e
JD
250 case LTTNG_EVENT_CONTEXT_INTERRUPTIBLE:
251 kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_INTERRUPTIBLE;
252 break;
253 case LTTNG_EVENT_CONTEXT_PREEMPTIBLE:
254 kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_PREEMPTIBLE;
255 break;
256 case LTTNG_EVENT_CONTEXT_NEED_RESCHEDULE:
257 kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_NEED_RESCHEDULE;
258 break;
259 case LTTNG_EVENT_CONTEXT_MIGRATABLE:
260 kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_MIGRATABLE;
261 break;
9197c5c4 262 default:
fc7324e8
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263 ret = LTTNG_ERR_KERN_CONTEXT_FAIL;
264 goto error;
9197c5c4
MD
265 }
266
645328ae
DG
267 kctx->ctx.u.perf_counter.type = ctx->u.perf_counter.type;
268 kctx->ctx.u.perf_counter.config = ctx->u.perf_counter.config;
269 strncpy(kctx->ctx.u.perf_counter.name, ctx->u.perf_counter.name,
54d01ffb 270 LTTNG_SYMBOL_NAME_LEN);
645328ae 271 kctx->ctx.u.perf_counter.name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
b579acd9 272
9d035200 273 if (*channel_name == '\0') {
645328ae 274 ret = add_kctx_all_channels(ksession, kctx);
df3c77c8
JG
275 /* Ownership of kctx is transferred to the callee. */
276 kctx = NULL;
f73fabfd 277 if (ret != LTTNG_OK) {
b579acd9
DG
278 goto error;
279 }
280 } else {
281 /* Get kernel channel */
62499ad6 282 kchan = trace_kernel_get_channel_by_name(channel_name, ksession);
b579acd9 283 if (kchan == NULL) {
f73fabfd 284 ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND;
b579acd9
DG
285 goto error;
286 }
287
645328ae 288 ret = add_kctx_to_channel(kctx, kchan);
df3c77c8
JG
289 /* Ownership of kctx is transferred to the callee. */
290 kctx = NULL;
f73fabfd 291 if (ret != LTTNG_OK) {
b579acd9
DG
292 goto error;
293 }
294 }
295
df3c77c8 296 ret = LTTNG_OK;
b579acd9
DG
297
298error:
fc7324e8
DG
299 if (kctx) {
300 trace_kernel_destroy_context(kctx);
301 }
b579acd9
DG
302 return ret;
303}
2bdd86d4
MD
304
305/*
55cc08a6 306 * Add UST context to tracer.
2bdd86d4 307 */
4ce7709b
JG
308int context_ust_add(struct ltt_ust_session *usess,
309 enum lttng_domain_type domain, struct lttng_event_context *ctx,
310 char *channel_name)
2bdd86d4 311{
601d5acf 312 int ret = LTTNG_OK;
442359c0 313 struct lttng_ht_iter iter;
bec39940 314 struct lttng_ht *chan_ht;
55cc08a6 315 struct ltt_ust_channel *uchan = NULL;
2bdd86d4 316
0525e9ae
DG
317 assert(usess);
318 assert(ctx);
319 assert(channel_name);
320
2223c96f
DG
321 rcu_read_lock();
322
f5501dad 323 chan_ht = usess->domain_global.channels;
2bdd86d4 324
55cc08a6 325 /* Get UST channel if defined */
9f9ee9c9 326 if (channel_name[0] != '\0') {
55cc08a6
DG
327 uchan = trace_ust_find_channel_by_name(chan_ht, channel_name);
328 if (uchan == NULL) {
f73fabfd 329 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
2bdd86d4
MD
330 goto error;
331 }
55cc08a6
DG
332 }
333
601d5acf
DG
334 if (uchan) {
335 /* Add ctx to channel */
6b79ed20 336 ret = add_uctx_to_channel(usess, domain, uchan, ctx);
601d5acf 337 } else {
e7fe706f 338 rcu_read_lock();
601d5acf 339 /* Add ctx all events, all channels */
bec39940 340 cds_lfht_for_each_entry(chan_ht->ht, &iter.iter, uchan, node.node) {
6b79ed20 341 ret = add_uctx_to_channel(usess, domain, uchan, ctx);
55cc08a6 342 if (ret < 0) {
9589be74
JG
343 ERR("Failed to add context to channel %s",
344 uchan->name);
55cc08a6
DG
345 continue;
346 }
2bdd86d4 347 }
e7fe706f 348 rcu_read_unlock();
55cc08a6 349 }
2bdd86d4 350
55cc08a6
DG
351 switch (ret) {
352 case -EEXIST:
f73fabfd 353 ret = LTTNG_ERR_UST_CONTEXT_EXIST;
727d5404 354 break;
55cc08a6 355 case -ENOMEM:
f73fabfd 356 ret = LTTNG_ERR_FATAL;
727d5404
DG
357 break;
358 case -EINVAL:
f73fabfd 359 ret = LTTNG_ERR_UST_CONTEXT_INVAL;
727d5404
DG
360 break;
361 case -ENOSYS:
f73fabfd 362 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
727d5404
DG
363 break;
364 default:
f73fabfd 365 ret = LTTNG_OK;
727d5404 366 break;
2bdd86d4
MD
367 }
368
2bdd86d4 369error:
2223c96f 370 rcu_read_unlock();
2bdd86d4
MD
371 return ret;
372}
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