Rename lttngerr.h to error.h
[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 it
5 * under the terms of the GNU General Public License as published by the Free
6 * Software Foundation; only version 2 of the License.
7 *
8 * This program is distributed in the hope that it will be useful, but WITHOUT
9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
11 * more details.
12 *
13 * You should have received a copy of the GNU General Public License along with
14 * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
15 * Place - Suite 330, Boston, MA 02111-1307, USA.
16 */
17
18 #define _GNU_SOURCE
19 #include <stdio.h>
20 #include <stdlib.h>
21 #include <string.h>
22 #include <unistd.h>
23 #include <urcu/list.h>
24
25 #include <common/error.h>
26 #include <common/sessiond-comm/sessiond-comm.h>
27
28 #include "context.h"
29 #include "kernel.h"
30 #include "ust-app.h"
31 #include "trace-ust.h"
32
33 /*
34 * Add kernel context to an event of a specific channel.
35 */
36 static int add_kctx_to_event(struct lttng_kernel_context *kctx,
37 struct ltt_kernel_channel *kchan, char *event_name)
38 {
39 int ret, found = 0;
40 struct ltt_kernel_event *kevent;
41
42 DBG("Add kernel context to event %s", event_name);
43
44 kevent = trace_kernel_get_event_by_name(event_name, kchan);
45 if (kevent != NULL) {
46 ret = kernel_add_event_context(kevent, kctx);
47 if (ret < 0) {
48 goto error;
49 }
50 found = 1;
51 }
52
53 ret = found;
54
55 error:
56 return ret;
57 }
58
59 /*
60 * Add kernel context to all channel.
61 *
62 * If event_name is specified, add context to event instead.
63 */
64 static int add_kctx_all_channels(struct ltt_kernel_session *ksession,
65 struct lttng_kernel_context *kctx, char *event_name)
66 {
67 int ret, no_event = 0, found = 0;
68 struct ltt_kernel_channel *kchan;
69
70 if (strlen(event_name) == 0) {
71 no_event = 1;
72 }
73
74 DBG("Adding kernel context to all channels (event: %s)", event_name);
75
76 /* Go over all channels */
77 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
78 if (no_event) {
79 ret = kernel_add_channel_context(kchan, kctx);
80 if (ret < 0) {
81 ret = LTTCOMM_KERN_CONTEXT_FAIL;
82 goto error;
83 }
84 } else {
85 ret = add_kctx_to_event(kctx, kchan, event_name);
86 if (ret < 0) {
87 ret = LTTCOMM_KERN_CONTEXT_FAIL;
88 goto error;
89 } else if (ret == 1) {
90 /* Event found and context added */
91 found = 1;
92 break;
93 }
94 }
95 }
96
97 if (!found && !no_event) {
98 ret = LTTCOMM_NO_EVENT;
99 goto error;
100 }
101
102 ret = LTTCOMM_OK;
103
104 error:
105 return ret;
106 }
107
108 /*
109 * Add kernel context to a specific channel.
110 *
111 * If event_name is specified, add context to that event.
112 */
113 static int add_kctx_to_channel(struct lttng_kernel_context *kctx,
114 struct ltt_kernel_channel *kchan, char *event_name)
115 {
116 int ret, no_event = 0, found = 0;
117
118 if (strlen(event_name) == 0) {
119 no_event = 1;
120 }
121
122 DBG("Add kernel context to channel '%s', event '%s'",
123 kchan->channel->name, event_name);
124
125 if (no_event) {
126 ret = kernel_add_channel_context(kchan, kctx);
127 if (ret < 0) {
128 ret = LTTCOMM_KERN_CONTEXT_FAIL;
129 goto error;
130 }
131 } else {
132 ret = add_kctx_to_event(kctx, kchan, event_name);
133 if (ret < 0) {
134 ret = LTTCOMM_KERN_CONTEXT_FAIL;
135 goto error;
136 } else if (ret == 1) {
137 /* Event found and context added */
138 found = 1;
139 }
140 }
141
142 if (!found && !no_event) {
143 ret = LTTCOMM_NO_EVENT;
144 goto error;
145 }
146
147 ret = LTTCOMM_OK;
148
149 error:
150 return ret;
151 }
152
153 /*
154 * Add UST context to channel.
155 */
156 static int add_uctx_to_channel(struct ltt_ust_session *usess, int domain,
157 struct ltt_ust_channel *uchan, struct lttng_event_context *ctx)
158 {
159 int ret;
160 struct ltt_ust_context *uctx;
161
162 /* Create ltt UST context */
163 uctx = trace_ust_create_context(ctx);
164 if (uctx == NULL) {
165 ret = LTTCOMM_FATAL;
166 goto error;
167 }
168
169 switch (domain) {
170 case LTTNG_DOMAIN_UST:
171 ret = ust_app_add_ctx_channel_glb(usess, uchan, uctx);
172 if (ret < 0) {
173 goto error;
174 }
175 break;
176 default:
177 ret = LTTCOMM_NOT_IMPLEMENTED;
178 goto error;
179 }
180
181 /* Add ltt UST context node to ltt UST channel */
182 lttng_ht_add_unique_ulong(uchan->ctx, &uctx->node);
183
184 return LTTCOMM_OK;
185
186 error:
187 free(uctx);
188 return ret;
189 }
190
191 /*
192 * Add UST context to event.
193 */
194 static int add_uctx_to_event(struct ltt_ust_session *usess, int domain,
195 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent,
196 struct lttng_event_context *ctx)
197 {
198 int ret;
199 struct ltt_ust_context *uctx;
200
201 /* Create ltt UST context */
202 uctx = trace_ust_create_context(ctx);
203 if (uctx == NULL) {
204 ret = LTTCOMM_FATAL;
205 goto error;
206 }
207
208 switch (domain) {
209 case LTTNG_DOMAIN_UST:
210 ret = ust_app_add_ctx_event_glb(usess, uchan, uevent, uctx);
211 if (ret < 0) {
212 goto error;
213 }
214 break;
215 default:
216 ret = LTTCOMM_NOT_IMPLEMENTED;
217 goto error;
218 }
219
220 /* Add ltt UST context node to ltt UST event */
221 lttng_ht_add_unique_ulong(uevent->ctx, &uctx->node);
222
223 return LTTCOMM_OK;
224
225 error:
226 free(uctx);
227 return ret;
228 }
229
230 /*
231 * Add kernel context to tracer.
232 */
233 int context_kernel_add(struct ltt_kernel_session *ksession,
234 struct lttng_event_context *ctx, char *event_name,
235 char *channel_name)
236 {
237 int ret;
238 struct ltt_kernel_channel *kchan;
239 struct lttng_kernel_context kctx;
240
241 /* Setup kernel context structure */
242 kctx.ctx = ctx->ctx;
243 kctx.u.perf_counter.type = ctx->u.perf_counter.type;
244 kctx.u.perf_counter.config = ctx->u.perf_counter.config;
245 strncpy(kctx.u.perf_counter.name, ctx->u.perf_counter.name,
246 LTTNG_SYMBOL_NAME_LEN);
247 kctx.u.perf_counter.name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
248
249 if (strlen(channel_name) == 0) {
250 ret = add_kctx_all_channels(ksession, &kctx, event_name);
251 if (ret != LTTCOMM_OK) {
252 goto error;
253 }
254 } else {
255 /* Get kernel channel */
256 kchan = trace_kernel_get_channel_by_name(channel_name, ksession);
257 if (kchan == NULL) {
258 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
259 goto error;
260 }
261
262 ret = add_kctx_to_channel(&kctx, kchan, event_name);
263 if (ret != LTTCOMM_OK) {
264 goto error;
265 }
266 }
267
268 ret = LTTCOMM_OK;
269
270 error:
271 return ret;
272 }
273
274 /*
275 * Add UST context to tracer.
276 */
277 int context_ust_add(struct ltt_ust_session *usess, int domain,
278 struct lttng_event_context *ctx, char *event_name,
279 char *channel_name)
280 {
281 int ret = LTTCOMM_OK, have_event = 0;
282 struct lttng_ht_iter iter, uiter;
283 struct lttng_ht *chan_ht;
284 struct ltt_ust_channel *uchan = NULL;
285 struct ltt_ust_event *uevent = NULL;
286
287 /*
288 * Define which channel's hashtable to use from the domain or quit if
289 * unknown domain.
290 */
291 switch (domain) {
292 case LTTNG_DOMAIN_UST:
293 chan_ht = usess->domain_global.channels;
294 break;
295 case LTTNG_DOMAIN_UST_EXEC_NAME:
296 case LTTNG_DOMAIN_UST_PID:
297 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
298 default:
299 ret = LTTCOMM_NOT_IMPLEMENTED;
300 goto error;
301 }
302
303 /* Do we have an event name */
304 if (strlen(event_name) != 0) {
305 have_event = 1;
306 }
307
308 /* Get UST channel if defined */
309 if (strlen(channel_name) != 0) {
310 uchan = trace_ust_find_channel_by_name(chan_ht, channel_name);
311 if (uchan == NULL) {
312 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
313 goto error;
314 }
315 }
316
317 /* If UST channel specified and event name, get UST event ref */
318 if (uchan && have_event) {
319 uevent = trace_ust_find_event_by_name(uchan->events, event_name);
320 if (uevent == NULL) {
321 ret = LTTCOMM_UST_EVENT_NOT_FOUND;
322 goto error;
323 }
324 }
325
326 /* At this point, we have 4 possibilities */
327
328 if (uchan && uevent) { /* Add ctx to event in channel */
329 ret = add_uctx_to_event(usess, domain, uchan, uevent, ctx);
330 } else if (uchan && !have_event) { /* Add ctx to channel */
331 ret = add_uctx_to_channel(usess, domain, uchan, ctx);
332 } else if (!uchan && have_event) { /* Add ctx to event */
333 /* Add context to event without having the channel name */
334 cds_lfht_for_each_entry(chan_ht->ht, &iter.iter, uchan, node.node) {
335 uevent = trace_ust_find_event_by_name(uchan->events, event_name);
336 if (uevent != NULL) {
337 ret = add_uctx_to_event(usess, domain, uchan, uevent, ctx);
338 /*
339 * LTTng UST does not allowed the same event to be registered
340 * multiple time in different or the same channel. So, if we
341 * found our event, we stop.
342 */
343 goto end;
344 }
345 }
346 ret = LTTCOMM_UST_EVENT_NOT_FOUND;
347 goto error;
348 } else if (!uchan && !have_event) { /* Add ctx all events, all channels */
349 /* For all channels */
350 cds_lfht_for_each_entry(chan_ht->ht, &iter.iter, uchan, node.node) {
351 ret = add_uctx_to_channel(usess, domain, uchan, ctx);
352 if (ret < 0) {
353 ERR("Context added to channel %s failed", uchan->name);
354 continue;
355 }
356
357 /* For all events in channel */
358 cds_lfht_for_each_entry(uchan->events->ht, &uiter.iter, uevent,
359 node.node) {
360 ret = add_uctx_to_event(usess, domain, uchan, uevent, ctx);
361 if (ret < 0) {
362 ERR("Context add to event %s in channel %s failed",
363 uevent->attr.name, uchan->name);
364 continue;
365 }
366 }
367 }
368 }
369
370 end:
371 switch (ret) {
372 case -EEXIST:
373 ret = LTTCOMM_UST_CONTEXT_EXIST;
374 goto error;
375 case -ENOMEM:
376 ret = LTTCOMM_FATAL;
377 goto error;
378 }
379
380 return LTTCOMM_OK;
381
382 error:
383 return ret;
384 }
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