Fix: Add vpid, vppid and vtid info in add-context help
[lttng-tools.git] / src / bin / lttng-sessiond / context.c
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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.
b579acd9 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.
b579acd9 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 <stdio.h>
20#include <stdlib.h>
21#include <string.h>
22#include <unistd.h>
54d01ffb 23#include <urcu/list.h>
1e307fab 24
db758600 25#include <common/error.h>
10a8a223 26#include <common/sessiond-comm/sessiond-comm.h>
b579acd9 27
b579acd9 28#include "context.h"
4771f025 29#include "kernel.h"
55cc08a6 30#include "ust-app.h"
34378f76 31#include "trace-ust.h"
b579acd9 32
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33/*
34 * Add kernel context to all channel.
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35 */
36static int add_kctx_all_channels(struct ltt_kernel_session *ksession,
601d5acf 37 struct lttng_kernel_context *kctx)
b579acd9 38{
601d5acf 39 int ret;
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40 struct ltt_kernel_channel *kchan;
41
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42 assert(ksession);
43 assert(kctx);
44
601d5acf 45 DBG("Adding kernel context to all channels");
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46
47 /* Go over all channels */
48 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
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49 ret = kernel_add_channel_context(kchan, kctx);
50 if (ret < 0) {
51 ret = LTTNG_ERR_KERN_CONTEXT_FAIL;
52 goto error;
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53 }
54 }
55
f73fabfd 56 ret = LTTNG_OK;
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57
58error:
59 return ret;
60}
61
62/*
63 * Add kernel context to a specific channel.
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64 */
65static int add_kctx_to_channel(struct lttng_kernel_context *kctx,
601d5acf 66 struct ltt_kernel_channel *kchan)
b579acd9 67{
601d5acf 68 int ret;
b579acd9 69
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70 assert(kchan);
71 assert(kctx);
72
601d5acf 73 DBG("Add kernel context to channel '%s'", kchan->channel->name);
b579acd9 74
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75 ret = kernel_add_channel_context(kchan, kctx);
76 if (ret < 0) {
77 ret = LTTNG_ERR_KERN_CONTEXT_FAIL;
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78 goto error;
79 }
80
f73fabfd 81 ret = LTTNG_OK;
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82
83error:
84 return ret;
85}
86
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87/*
88 * Add UST context to channel.
89 */
90static int add_uctx_to_channel(struct ltt_ust_session *usess, int domain,
91 struct ltt_ust_channel *uchan, struct lttng_event_context *ctx)
92{
93 int ret;
94 struct ltt_ust_context *uctx;
95
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96 assert(usess);
97 assert(uchan);
98 assert(ctx);
99
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100 /* Check if context is duplicate */
101 cds_list_for_each_entry(uctx, &uchan->ctx_list, list) {
102 if (trace_ust_match_context(uctx, ctx)) {
103 ret = -EEXIST;
104 goto duplicate;
105 }
106 }
107
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108 /* Create ltt UST context */
109 uctx = trace_ust_create_context(ctx);
110 if (uctx == NULL) {
727d5404 111 ret = -EINVAL;
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112 goto error;
113 }
114
115 switch (domain) {
116 case LTTNG_DOMAIN_UST:
117 ret = ust_app_add_ctx_channel_glb(usess, uchan, uctx);
118 if (ret < 0) {
119 goto error;
120 }
121 break;
122 default:
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123 ret = -ENOSYS;
124 goto error;
125 }
126
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127 rcu_read_lock();
128
6b79ed20 129 /* Add ltt UST context node to ltt UST channel */
aa3514e9 130 lttng_ht_add_ulong(uchan->ctx, &uctx->node);
e7fe706f 131 rcu_read_unlock();
31746f93 132 cds_list_add_tail(&uctx->list, &uchan->ctx_list);
6b79ed20 133
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134 DBG("Context UST %d added to channel %s", uctx->ctx.ctx, uchan->name);
135
136 return 0;
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137
138error:
139 free(uctx);
aa3514e9 140duplicate:
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141 return ret;
142}
143
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144/*
145 * Add kernel context to tracer.
146 */
54d01ffb 147int context_kernel_add(struct ltt_kernel_session *ksession,
601d5acf 148 struct lttng_event_context *ctx, char *channel_name)
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149{
150 int ret;
151 struct ltt_kernel_channel *kchan;
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152 struct lttng_kernel_context kctx;
153
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154 assert(ksession);
155 assert(ctx);
156 assert(channel_name);
157
54d01ffb 158 /* Setup kernel context structure */
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159 switch (ctx->ctx) {
160 case LTTNG_EVENT_CONTEXT_PID:
161 kctx.ctx = LTTNG_KERNEL_CONTEXT_PID;
162 break;
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163 case LTTNG_EVENT_CONTEXT_PROCNAME:
164 kctx.ctx = LTTNG_KERNEL_CONTEXT_PROCNAME;
165 break;
166 case LTTNG_EVENT_CONTEXT_PRIO:
167 kctx.ctx = LTTNG_KERNEL_CONTEXT_PRIO;
168 break;
169 case LTTNG_EVENT_CONTEXT_NICE:
170 kctx.ctx = LTTNG_KERNEL_CONTEXT_NICE;
171 break;
172 case LTTNG_EVENT_CONTEXT_VPID:
173 kctx.ctx = LTTNG_KERNEL_CONTEXT_VPID;
174 break;
175 case LTTNG_EVENT_CONTEXT_TID:
176 kctx.ctx = LTTNG_KERNEL_CONTEXT_TID;
177 break;
178 case LTTNG_EVENT_CONTEXT_VTID:
179 kctx.ctx = LTTNG_KERNEL_CONTEXT_VTID;
180 break;
181 case LTTNG_EVENT_CONTEXT_PPID:
182 kctx.ctx = LTTNG_KERNEL_CONTEXT_PPID;
183 break;
184 case LTTNG_EVENT_CONTEXT_VPPID:
185 kctx.ctx = LTTNG_KERNEL_CONTEXT_VPPID;
186 break;
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187 case LTTNG_EVENT_CONTEXT_HOSTNAME:
188 kctx.ctx = LTTNG_KERNEL_CONTEXT_HOSTNAME;
189 break;
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190 case LTTNG_EVENT_CONTEXT_PERF_CPU_COUNTER:
191 case LTTNG_EVENT_CONTEXT_PERF_COUNTER:
192 kctx.ctx = LTTNG_KERNEL_CONTEXT_PERF_CPU_COUNTER;
193 break;
9197c5c4 194 default:
f73fabfd 195 return LTTNG_ERR_KERN_CONTEXT_FAIL;
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196 }
197
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198 kctx.u.perf_counter.type = ctx->u.perf_counter.type;
199 kctx.u.perf_counter.config = ctx->u.perf_counter.config;
200 strncpy(kctx.u.perf_counter.name, ctx->u.perf_counter.name,
201 LTTNG_SYMBOL_NAME_LEN);
202 kctx.u.perf_counter.name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
b579acd9 203
9d035200 204 if (*channel_name == '\0') {
601d5acf 205 ret = add_kctx_all_channels(ksession, &kctx);
f73fabfd 206 if (ret != LTTNG_OK) {
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207 goto error;
208 }
209 } else {
210 /* Get kernel channel */
62499ad6 211 kchan = trace_kernel_get_channel_by_name(channel_name, ksession);
b579acd9 212 if (kchan == NULL) {
f73fabfd 213 ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND;
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214 goto error;
215 }
216
601d5acf 217 ret = add_kctx_to_channel(&kctx, kchan);
f73fabfd 218 if (ret != LTTNG_OK) {
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219 goto error;
220 }
221 }
222
f73fabfd 223 ret = LTTNG_OK;
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224
225error:
226 return ret;
227}
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228
229/*
55cc08a6 230 * Add UST context to tracer.
2bdd86d4 231 */
55cc08a6 232int context_ust_add(struct ltt_ust_session *usess, int domain,
601d5acf 233 struct lttng_event_context *ctx, char *channel_name)
2bdd86d4 234{
601d5acf 235 int ret = LTTNG_OK;
442359c0 236 struct lttng_ht_iter iter;
bec39940 237 struct lttng_ht *chan_ht;
55cc08a6 238 struct ltt_ust_channel *uchan = NULL;
2bdd86d4 239
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240 assert(usess);
241 assert(ctx);
242 assert(channel_name);
243
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244 rcu_read_lock();
245
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246 /*
247 * Define which channel's hashtable to use from the domain or quit if
248 * unknown domain.
249 */
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250 switch (domain) {
251 case LTTNG_DOMAIN_UST:
252 chan_ht = usess->domain_global.channels;
253 break;
d78d6610 254#if 0
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255 case LTTNG_DOMAIN_UST_EXEC_NAME:
256 case LTTNG_DOMAIN_UST_PID:
257 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
d78d6610 258#endif
55cc08a6 259 default:
f73fabfd 260 ret = LTTNG_ERR_UND;
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261 goto error;
262 }
2bdd86d4 263
55cc08a6 264 /* Get UST channel if defined */
9f9ee9c9 265 if (channel_name[0] != '\0') {
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266 uchan = trace_ust_find_channel_by_name(chan_ht, channel_name);
267 if (uchan == NULL) {
f73fabfd 268 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
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269 goto error;
270 }
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271 }
272
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273 if (uchan) {
274 /* Add ctx to channel */
6b79ed20 275 ret = add_uctx_to_channel(usess, domain, uchan, ctx);
601d5acf 276 } else {
e7fe706f 277 rcu_read_lock();
601d5acf 278 /* Add ctx all events, all channels */
bec39940 279 cds_lfht_for_each_entry(chan_ht->ht, &iter.iter, uchan, node.node) {
6b79ed20 280 ret = add_uctx_to_channel(usess, domain, uchan, ctx);
55cc08a6 281 if (ret < 0) {
ae856491 282 ERR("Context failed for channel %s", uchan->name);
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283 continue;
284 }
2bdd86d4 285 }
e7fe706f 286 rcu_read_unlock();
55cc08a6 287 }
2bdd86d4 288
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289 switch (ret) {
290 case -EEXIST:
f73fabfd 291 ret = LTTNG_ERR_UST_CONTEXT_EXIST;
727d5404 292 break;
55cc08a6 293 case -ENOMEM:
f73fabfd 294 ret = LTTNG_ERR_FATAL;
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295 break;
296 case -EINVAL:
f73fabfd 297 ret = LTTNG_ERR_UST_CONTEXT_INVAL;
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298 break;
299 case -ENOSYS:
f73fabfd 300 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
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301 break;
302 default:
f73fabfd 303 ret = LTTNG_OK;
727d5404 304 break;
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305 }
306
2bdd86d4 307error:
2223c96f 308 rcu_read_unlock();
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309 return ret;
310}
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