Fix: Hide readwrite symbols in common lib
[lttng-tools.git] / src / bin / lttng-sessiond / context.c
1 /*
2 * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
3 *
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.
7 *
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.
12 *
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.
16 */
17
18 #define _GNU_SOURCE
19 #define _LGPL_SOURCE
20 #include <stdio.h>
21 #include <stdlib.h>
22 #include <string.h>
23 #include <unistd.h>
24 #include <urcu/list.h>
25
26 #include <common/error.h>
27 #include <common/sessiond-comm/sessiond-comm.h>
28
29 #include "context.h"
30 #include "kernel.h"
31 #include "ust-app.h"
32 #include "trace-ust.h"
33
34 /*
35 * Add kernel context to all channel.
36 */
37 static int add_kctx_all_channels(struct ltt_kernel_session *ksession,
38 struct ltt_kernel_context *kctx)
39 {
40 int ret;
41 struct ltt_kernel_channel *kchan;
42
43 assert(ksession);
44 assert(kctx);
45
46 DBG("Adding kernel context to all channels");
47
48 /* Go over all channels */
49 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
50 ret = kernel_add_channel_context(kchan, kctx);
51 if (ret < 0) {
52 ret = LTTNG_ERR_KERN_CONTEXT_FAIL;
53 goto error;
54 }
55 }
56
57 ret = LTTNG_OK;
58
59 error:
60 return ret;
61 }
62
63 /*
64 * Add kernel context to a specific channel.
65 */
66 static int add_kctx_to_channel(struct ltt_kernel_context *kctx,
67 struct ltt_kernel_channel *kchan)
68 {
69 int ret;
70
71 assert(kchan);
72 assert(kctx);
73
74 DBG("Add kernel context to channel '%s'", kchan->channel->name);
75
76 ret = kernel_add_channel_context(kchan, kctx);
77 if (ret < 0) {
78 ret = LTTNG_ERR_KERN_CONTEXT_FAIL;
79 goto error;
80 }
81
82 ret = LTTNG_OK;
83
84 error:
85 return ret;
86 }
87
88 /*
89 * Add UST context to channel.
90 */
91 static int add_uctx_to_channel(struct ltt_ust_session *usess, int domain,
92 struct ltt_ust_channel *uchan, struct lttng_event_context *ctx)
93 {
94 int ret;
95 struct ltt_ust_context *uctx;
96
97 assert(usess);
98 assert(uchan);
99 assert(ctx);
100
101 /* Check if context is duplicate */
102 cds_list_for_each_entry(uctx, &uchan->ctx_list, list) {
103 if (trace_ust_match_context(uctx, ctx)) {
104 ret = -EEXIST;
105 goto duplicate;
106 }
107 }
108
109 /* Create ltt UST context */
110 uctx = trace_ust_create_context(ctx);
111 if (uctx == NULL) {
112 ret = -EINVAL;
113 goto error;
114 }
115
116 switch (domain) {
117 case LTTNG_DOMAIN_UST:
118 ret = ust_app_add_ctx_channel_glb(usess, uchan, uctx);
119 if (ret < 0) {
120 goto error;
121 }
122 break;
123 default:
124 ret = -ENOSYS;
125 goto error;
126 }
127
128 rcu_read_lock();
129
130 /* Add ltt UST context node to ltt UST channel */
131 lttng_ht_add_ulong(uchan->ctx, &uctx->node);
132 rcu_read_unlock();
133 cds_list_add_tail(&uctx->list, &uchan->ctx_list);
134
135 DBG("Context UST %d added to channel %s", uctx->ctx.ctx, uchan->name);
136
137 return 0;
138
139 error:
140 free(uctx);
141 duplicate:
142 return ret;
143 }
144
145 /*
146 * Add kernel context to tracer.
147 */
148 int context_kernel_add(struct ltt_kernel_session *ksession,
149 struct lttng_event_context *ctx, char *channel_name)
150 {
151 int ret;
152 struct ltt_kernel_channel *kchan;
153 struct ltt_kernel_context *kctx;
154
155 assert(ksession);
156 assert(ctx);
157 assert(channel_name);
158
159 kctx = trace_kernel_create_context(NULL);
160 if (!kctx) {
161 ret = LTTNG_ERR_NOMEM;
162 goto error;
163 }
164
165 /* Setup kernel context structure */
166 switch (ctx->ctx) {
167 case LTTNG_EVENT_CONTEXT_PID:
168 kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_PID;
169 break;
170 case LTTNG_EVENT_CONTEXT_PROCNAME:
171 kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_PROCNAME;
172 break;
173 case LTTNG_EVENT_CONTEXT_PRIO:
174 kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_PRIO;
175 break;
176 case LTTNG_EVENT_CONTEXT_NICE:
177 kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_NICE;
178 break;
179 case LTTNG_EVENT_CONTEXT_VPID:
180 kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_VPID;
181 break;
182 case LTTNG_EVENT_CONTEXT_TID:
183 kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_TID;
184 break;
185 case LTTNG_EVENT_CONTEXT_VTID:
186 kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_VTID;
187 break;
188 case LTTNG_EVENT_CONTEXT_PPID:
189 kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_PPID;
190 break;
191 case LTTNG_EVENT_CONTEXT_VPPID:
192 kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_VPPID;
193 break;
194 case LTTNG_EVENT_CONTEXT_HOSTNAME:
195 kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_HOSTNAME;
196 break;
197 case LTTNG_EVENT_CONTEXT_PERF_CPU_COUNTER:
198 case LTTNG_EVENT_CONTEXT_PERF_COUNTER:
199 kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_PERF_CPU_COUNTER;
200 break;
201 default:
202 ret = LTTNG_ERR_KERN_CONTEXT_FAIL;
203 goto error;
204 }
205
206 kctx->ctx.u.perf_counter.type = ctx->u.perf_counter.type;
207 kctx->ctx.u.perf_counter.config = ctx->u.perf_counter.config;
208 strncpy(kctx->ctx.u.perf_counter.name, ctx->u.perf_counter.name,
209 LTTNG_SYMBOL_NAME_LEN);
210 kctx->ctx.u.perf_counter.name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
211
212 if (*channel_name == '\0') {
213 ret = add_kctx_all_channels(ksession, kctx);
214 if (ret != LTTNG_OK) {
215 goto error;
216 }
217 } else {
218 /* Get kernel channel */
219 kchan = trace_kernel_get_channel_by_name(channel_name, ksession);
220 if (kchan == NULL) {
221 ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND;
222 goto error;
223 }
224
225 ret = add_kctx_to_channel(kctx, kchan);
226 if (ret != LTTNG_OK) {
227 goto error;
228 }
229 }
230
231 return LTTNG_OK;
232
233 error:
234 if (kctx) {
235 trace_kernel_destroy_context(kctx);
236 }
237 return ret;
238 }
239
240 /*
241 * Add UST context to tracer.
242 */
243 int context_ust_add(struct ltt_ust_session *usess, int domain,
244 struct lttng_event_context *ctx, char *channel_name)
245 {
246 int ret = LTTNG_OK;
247 struct lttng_ht_iter iter;
248 struct lttng_ht *chan_ht;
249 struct ltt_ust_channel *uchan = NULL;
250
251 assert(usess);
252 assert(ctx);
253 assert(channel_name);
254
255 rcu_read_lock();
256
257 /*
258 * Define which channel's hashtable to use from the domain or quit if
259 * unknown domain.
260 */
261 switch (domain) {
262 case LTTNG_DOMAIN_UST:
263 chan_ht = usess->domain_global.channels;
264 break;
265 default:
266 ret = LTTNG_ERR_UND;
267 goto error;
268 }
269
270 /* Get UST channel if defined */
271 if (channel_name[0] != '\0') {
272 uchan = trace_ust_find_channel_by_name(chan_ht, channel_name);
273 if (uchan == NULL) {
274 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
275 goto error;
276 }
277 }
278
279 if (uchan) {
280 /* Add ctx to channel */
281 ret = add_uctx_to_channel(usess, domain, uchan, ctx);
282 } else {
283 rcu_read_lock();
284 /* Add ctx all events, all channels */
285 cds_lfht_for_each_entry(chan_ht->ht, &iter.iter, uchan, node.node) {
286 ret = add_uctx_to_channel(usess, domain, uchan, ctx);
287 if (ret < 0) {
288 ERR("Context failed for channel %s", uchan->name);
289 continue;
290 }
291 }
292 rcu_read_unlock();
293 }
294
295 switch (ret) {
296 case -EEXIST:
297 ret = LTTNG_ERR_UST_CONTEXT_EXIST;
298 break;
299 case -ENOMEM:
300 ret = LTTNG_ERR_FATAL;
301 break;
302 case -EINVAL:
303 ret = LTTNG_ERR_UST_CONTEXT_INVAL;
304 break;
305 case -ENOSYS:
306 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
307 break;
308 default:
309 ret = LTTNG_OK;
310 break;
311 }
312
313 error:
314 rcu_read_unlock();
315 return ret;
316 }
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