Implement health check for app registration dispatch
[lttng-tools.git] / src / bin / lttng-sessiond / context.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.
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;
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95 struct lttng_ht_iter iter;
96 struct lttng_ht_node_ulong *uctx_node;
6b79ed20 97
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98 assert(usess);
99 assert(uchan);
100 assert(ctx);
101
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102 /* Create ltt UST context */
103 uctx = trace_ust_create_context(ctx);
104 if (uctx == NULL) {
727d5404 105 ret = -EINVAL;
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106 goto error;
107 }
108
109 switch (domain) {
110 case LTTNG_DOMAIN_UST:
111 ret = ust_app_add_ctx_channel_glb(usess, uchan, uctx);
112 if (ret < 0) {
113 goto error;
114 }
115 break;
116 default:
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117 ret = -ENOSYS;
118 goto error;
119 }
120
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121 rcu_read_lock();
122
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123 /* Lookup context before adding it */
124 lttng_ht_lookup(uchan->ctx, (void *)((unsigned long)uctx->ctx.ctx), &iter);
125 uctx_node = lttng_ht_iter_get_node_ulong(&iter);
126 if (uctx_node != NULL) {
127 ret = -EEXIST;
e7fe706f 128 rcu_read_unlock();
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129 goto error;
130 }
131
132 /* Add ltt UST context node to ltt UST channel */
bec39940 133 lttng_ht_add_unique_ulong(uchan->ctx, &uctx->node);
e7fe706f 134 rcu_read_unlock();
6b79ed20 135
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136 DBG("Context UST %d added to channel %s", uctx->ctx.ctx, uchan->name);
137
138 return 0;
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139
140error:
141 free(uctx);
142 return ret;
143}
144
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145/*
146 * Add kernel context to tracer.
147 */
54d01ffb 148int context_kernel_add(struct ltt_kernel_session *ksession,
601d5acf 149 struct lttng_event_context *ctx, char *channel_name)
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150{
151 int ret;
152 struct ltt_kernel_channel *kchan;
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153 struct lttng_kernel_context kctx;
154
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155 assert(ksession);
156 assert(ctx);
157 assert(channel_name);
158
54d01ffb 159 /* Setup kernel context structure */
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160 switch (ctx->ctx) {
161 case LTTNG_EVENT_CONTEXT_PID:
162 kctx.ctx = LTTNG_KERNEL_CONTEXT_PID;
163 break;
164 case LTTNG_EVENT_CONTEXT_PERF_COUNTER:
165 kctx.ctx = LTTNG_KERNEL_CONTEXT_PERF_COUNTER;
166 break;
167 case LTTNG_EVENT_CONTEXT_PROCNAME:
168 kctx.ctx = LTTNG_KERNEL_CONTEXT_PROCNAME;
169 break;
170 case LTTNG_EVENT_CONTEXT_PRIO:
171 kctx.ctx = LTTNG_KERNEL_CONTEXT_PRIO;
172 break;
173 case LTTNG_EVENT_CONTEXT_NICE:
174 kctx.ctx = LTTNG_KERNEL_CONTEXT_NICE;
175 break;
176 case LTTNG_EVENT_CONTEXT_VPID:
177 kctx.ctx = LTTNG_KERNEL_CONTEXT_VPID;
178 break;
179 case LTTNG_EVENT_CONTEXT_TID:
180 kctx.ctx = LTTNG_KERNEL_CONTEXT_TID;
181 break;
182 case LTTNG_EVENT_CONTEXT_VTID:
183 kctx.ctx = LTTNG_KERNEL_CONTEXT_VTID;
184 break;
185 case LTTNG_EVENT_CONTEXT_PPID:
186 kctx.ctx = LTTNG_KERNEL_CONTEXT_PPID;
187 break;
188 case LTTNG_EVENT_CONTEXT_VPPID:
189 kctx.ctx = LTTNG_KERNEL_CONTEXT_VPPID;
190 break;
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191 case LTTNG_EVENT_CONTEXT_HOSTNAME:
192 kctx.ctx = LTTNG_KERNEL_CONTEXT_HOSTNAME;
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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