fb46b4ad6db91fdce417d9f4a9fc185b9e909c2c
[lttng-tools.git] / lttng-sessiond / channel.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 #include <string.h>
19 #include <unistd.h>
20
21 #include <lttng/lttng.h>
22 #include <lttng-sessiond-comm.h>
23 #include <lttngerr.h>
24
25 #include "channel.h"
26 #include "hashtable.h"
27 #include "kernel.h"
28 #include "ust-ctl.h"
29 #include "utils.h"
30
31 /*
32 * Return allocated channel attributes.
33 */
34 struct lttng_channel *channel_new_default_attr(int dom)
35 {
36 struct lttng_channel *chan;
37
38 chan = zmalloc(sizeof(struct lttng_channel));
39 if (chan == NULL) {
40 perror("zmalloc channel init");
41 goto error_alloc;
42 }
43
44 if (snprintf(chan->name, sizeof(chan->name), "%s",
45 DEFAULT_CHANNEL_NAME) < 0) {
46 perror("snprintf default channel name");
47 goto error;
48 }
49
50 chan->attr.overwrite = DEFAULT_CHANNEL_OVERWRITE;
51 chan->attr.switch_timer_interval = DEFAULT_CHANNEL_SWITCH_TIMER;
52 chan->attr.read_timer_interval = DEFAULT_CHANNEL_READ_TIMER;
53
54 switch (dom) {
55 case LTTNG_DOMAIN_KERNEL:
56 chan->attr.subbuf_size = DEFAULT_KERNEL_CHANNEL_SUBBUF_SIZE;
57 chan->attr.num_subbuf = DEFAULT_KERNEL_CHANNEL_SUBBUF_NUM;
58 chan->attr.output = DEFAULT_KERNEL_CHANNEL_OUTPUT;
59 break;
60 case LTTNG_DOMAIN_UST:
61 case LTTNG_DOMAIN_UST_PID:
62 chan->attr.subbuf_size = DEFAULT_UST_CHANNEL_SUBBUF_SIZE;
63 chan->attr.num_subbuf = DEFAULT_UST_CHANNEL_SUBBUF_NUM;
64 chan->attr.output = DEFAULT_UST_CHANNEL_OUTPUT;
65 break;
66 default:
67 goto error; /* Not implemented */
68 }
69
70 return chan;
71
72 error:
73 free(chan);
74 error_alloc:
75 return NULL;
76 }
77
78 /*
79 * Copy two ltt ust channel. Dst and src must be already allocated.
80 */
81 int channel_ust_copy(struct ltt_ust_channel *dst,
82 struct ltt_ust_channel *src)
83 {
84 //struct ltt_ust_event *uevent, *new_uevent;
85
86 memcpy(dst, src, sizeof(struct ltt_ust_channel));
87 dst->events = hashtable_new_str(0);
88
89 /*
90 cds_list_for_each_entry(uevent, &src->events.head, list) {
91 new_uevent = zmalloc(sizeof(struct ltt_ust_event));
92 if (new_uevent == NULL) {
93 perror("zmalloc ltt_ust_event");
94 goto error;
95 }
96
97 memcpy(new_uevent, uevent, sizeof(struct ltt_ust_event));
98 cds_list_add(&new_uevent->list, &dst->events.head);
99 dst->events.count++;
100 }
101 */
102
103 return 0;
104
105 //error:
106 // return -1;
107 }
108
109 /*
110 * Disable kernel channel of the kernel session.
111 */
112 int channel_kernel_disable(struct ltt_kernel_session *ksession,
113 char *channel_name)
114 {
115 int ret;
116 struct ltt_kernel_channel *kchan;
117
118 kchan = trace_kernel_get_channel_by_name(channel_name, ksession);
119 if (kchan == NULL) {
120 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
121 goto error;
122 } else if (kchan->enabled == 1) {
123 ret = kernel_disable_channel(kchan);
124 if (ret < 0) {
125 if (ret != EEXIST) {
126 ret = LTTCOMM_KERN_CHAN_DISABLE_FAIL;
127 }
128 goto error;
129 }
130 }
131
132 ret = LTTCOMM_OK;
133
134 error:
135 return ret;
136 }
137
138 /*
139 * Enable kernel channel of the kernel session.
140 */
141 int channel_kernel_enable(struct ltt_kernel_session *ksession,
142 struct ltt_kernel_channel *kchan)
143 {
144 int ret;
145
146 if (kchan->enabled == 0) {
147 ret = kernel_enable_channel(kchan);
148 if (ret < 0) {
149 ret = LTTCOMM_KERN_CHAN_ENABLE_FAIL;
150 goto error;
151 }
152 }
153
154 ret = LTTCOMM_OK;
155
156 error:
157 return ret;
158 }
159
160 /*
161 * Create kernel channel of the kernel session and notify kernel thread.
162 */
163 int channel_kernel_create(struct ltt_kernel_session *ksession,
164 struct lttng_channel *attr, int kernel_pipe)
165 {
166 int ret;
167 struct lttng_channel *defattr = NULL;
168
169 /* Creating channel attributes if needed */
170 if (attr == NULL) {
171 defattr = channel_new_default_attr(LTTNG_DOMAIN_KERNEL);
172 if (defattr == NULL) {
173 ret = LTTCOMM_FATAL;
174 goto error;
175 }
176 attr = defattr;
177 }
178
179 /* Channel not found, creating it */
180 ret = kernel_create_channel(ksession, attr, ksession->trace_path);
181 if (ret < 0) {
182 ret = LTTCOMM_KERN_CHAN_FAIL;
183 goto error;
184 }
185
186 /* Notify kernel thread that there is a new channel */
187 ret = notify_thread_pipe(kernel_pipe);
188 if (ret < 0) {
189 ret = LTTCOMM_FATAL;
190 goto error;
191 }
192
193 ret = LTTCOMM_OK;
194 error:
195 free(defattr);
196 return ret;
197 }
198
199 /*
200 * Create UST channel and enable it on the tracer.
201 */
202 int channel_ust_create(struct ltt_ust_session *usess,
203 struct lttng_channel *attr)
204 {
205 int ret;
206 struct ltt_ust_channel *uchan;
207 //struct lttng_ust_channel_attr uattr;
208 //struct object_data *obj;
209
210 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
211 attr->name);
212 if (uchan == NULL) {
213 uchan = trace_ust_create_channel(attr, usess->pathname);
214 if (uchan == NULL) {
215 ret = LTTCOMM_UST_CHAN_FAIL;
216 goto error;
217 }
218 rcu_read_lock();
219 hashtable_add_unique(usess->domain_global.channels, &uchan->node);
220 rcu_read_unlock();
221 } else {
222 ret = LTTCOMM_UST_CHAN_EXIST;
223 goto error;
224 }
225
226 /* TODO: NOTIFY ust application to update */
227 /*
228 ret = ustctl_create_channel(sock, usession->handle, &uattr, &obj);
229 if (ret < 0) {
230 ret = LTTCOMM_UST_CHAN_FAIL;
231 goto error;
232 }
233 */
234
235 /*
236 uchan->attr.overwrite = uattr.overwrite;
237 uchan->attr.subbuf_size = uattr.subbuf_size;
238 uchan->attr.num_subbuf = uattr.num_subbuf;
239 uchan->attr.switch_timer_interval = uattr.switch_timer_interval;
240 uchan->attr.read_timer_interval = uattr.read_timer_interval;
241 uchan->attr.output = uattr.output;
242 uchan->handle = obj->handle;
243 uchan->attr.shm_fd = obj->shm_fd;
244 uchan->attr.wait_fd = obj->wait_fd;
245 uchan->attr.memory_map_size = obj->memory_map_size;
246 uchan->obj = obj;
247 */
248
249 /* Add channel to session */
250 //rcu_read_lock();
251 //cds_list_add(&uchan->list, &usession->channels.head);
252 //usession->channels.count++;
253 //rcu_read_unlock();
254
255 //DBG2("Channel %s UST create successfully for sock:%d", uchan->name, sock);
256
257 ret = LTTCOMM_OK;
258
259 error:
260 return ret;
261 }
262
263 /*
264 * Enable UST channel on the tracer.
265 */
266 int channel_ust_enable(struct ltt_ust_session *usession,
267 struct ltt_ust_channel *uchan, int sock)
268 {
269 int ret = LTTCOMM_OK;
270 #ifdef DISABLE
271 struct object_data obj;
272
273 obj.shm_fd = uchan->attr.shm_fd;
274 obj.wait_fd = uchan->attr.wait_fd;
275 obj.memory_map_size = uchan->attr.memory_map_size;
276 ret = ustctl_enable(sock, &obj);
277 if (ret < 0) {
278 ret = LTTCOMM_UST_CHAN_FAIL;
279 goto end;
280 }
281 ret = LTTCOMM_OK;
282 end:
283 #endif
284 return ret;
285 }
286
287 /*
288 * Disable UST channel on the tracer.
289 */
290 int channel_ust_disable(struct ltt_ust_session *usession,
291 struct ltt_ust_channel *uchan, int sock)
292 {
293 int ret = LTTCOMM_OK;
294 #ifdef DISABLE
295 struct object_data obj;
296
297 obj.shm_fd = uchan->attr.shm_fd;
298 obj.wait_fd = uchan->attr.wait_fd;
299 obj.memory_map_size = uchan->attr.memory_map_size;
300 ret = ustctl_disable(sock, &obj);
301 if (ret < 0) {
302 ret = LTTCOMM_UST_CHAN_FAIL;
303 goto end;
304 }
305 ret = LTTCOMM_OK;
306 end:
307 #endif
308 return ret;
309 }
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