Basic hashtable support for UST
[lttng-tools.git] / ltt-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 #ifdef CONFIG_LTTNG_TOOLS_HAVE_UST
25 #include <ust/lttng-ust-ctl.h>
26 #include <ust/lttng-ust-abi.h>
27 #else
28 #include "lttng-ust-ctl.h"
29 #include "lttng-ust-abi.h"
30 #endif
31
32 #include "channel.h"
33 #include "hashtable.h"
34 #include "kernel-ctl.h"
35 #include "ust-ctl.h"
36 #include "utils.h"
37
38 /*
39 * Return allocated channel attributes.
40 */
41 struct lttng_channel *channel_new_default_attr(int dom)
42 {
43 struct lttng_channel *chan;
44
45 chan = zmalloc(sizeof(struct lttng_channel));
46 if (chan == NULL) {
47 perror("malloc channel init");
48 goto error_alloc;
49 }
50
51 if (snprintf(chan->name, sizeof(chan->name), "%s",
52 DEFAULT_CHANNEL_NAME) < 0) {
53 perror("snprintf default channel name");
54 goto error;
55 }
56
57 chan->attr.overwrite = DEFAULT_CHANNEL_OVERWRITE;
58 chan->attr.switch_timer_interval = DEFAULT_CHANNEL_SWITCH_TIMER;
59 chan->attr.read_timer_interval = DEFAULT_CHANNEL_READ_TIMER;
60
61 switch (dom) {
62 case LTTNG_DOMAIN_KERNEL:
63 chan->attr.subbuf_size = DEFAULT_KERNEL_CHANNEL_SUBBUF_SIZE;
64 chan->attr.num_subbuf = DEFAULT_KERNEL_CHANNEL_SUBBUF_NUM;
65 chan->attr.output = DEFAULT_KERNEL_CHANNEL_OUTPUT;
66 break;
67 case LTTNG_DOMAIN_UST:
68 case LTTNG_DOMAIN_UST_PID:
69 chan->attr.subbuf_size = DEFAULT_UST_CHANNEL_SUBBUF_SIZE;
70 chan->attr.num_subbuf = DEFAULT_UST_CHANNEL_SUBBUF_NUM;
71 chan->attr.output = DEFAULT_UST_CHANNEL_OUTPUT;
72 break;
73 default:
74 goto error; /* Not implemented */
75 }
76
77 return chan;
78
79 error:
80 free(chan);
81 error_alloc:
82 return NULL;
83 }
84
85 /*
86 * Copy two ltt ust channel. Dst and src must be already allocated.
87 */
88 int channel_ust_copy(struct ltt_ust_channel *dst,
89 struct ltt_ust_channel *src)
90 {
91 //struct ltt_ust_event *uevent, *new_uevent;
92
93 memcpy(dst, src, sizeof(struct ltt_ust_channel));
94 dst->events = hashtable_new_str(0);
95
96 /*
97 cds_list_for_each_entry(uevent, &src->events.head, list) {
98 new_uevent = malloc(sizeof(struct ltt_ust_event));
99 if (new_uevent == NULL) {
100 perror("malloc ltt_ust_event");
101 goto error;
102 }
103
104 memcpy(new_uevent, uevent, sizeof(struct ltt_ust_event));
105 cds_list_add(&new_uevent->list, &dst->events.head);
106 dst->events.count++;
107 }
108 */
109
110 return 0;
111
112 //error:
113 // return -1;
114 }
115
116 /*
117 * Disable kernel channel of the kernel session.
118 */
119 int channel_kernel_disable(struct ltt_kernel_session *ksession,
120 char *channel_name)
121 {
122 int ret;
123 struct ltt_kernel_channel *kchan;
124
125 kchan = trace_kernel_get_channel_by_name(channel_name, ksession);
126 if (kchan == NULL) {
127 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
128 goto error;
129 } else if (kchan->enabled == 1) {
130 ret = kernel_disable_channel(kchan);
131 if (ret < 0) {
132 if (ret != EEXIST) {
133 ret = LTTCOMM_KERN_CHAN_DISABLE_FAIL;
134 }
135 goto error;
136 }
137 }
138
139 ret = LTTCOMM_OK;
140
141 error:
142 return ret;
143 }
144
145 /*
146 * Enable kernel channel of the kernel session.
147 */
148 int channel_kernel_enable(struct ltt_kernel_session *ksession,
149 struct ltt_kernel_channel *kchan)
150 {
151 int ret;
152
153 if (kchan->enabled == 0) {
154 ret = kernel_enable_channel(kchan);
155 if (ret < 0) {
156 ret = LTTCOMM_KERN_CHAN_ENABLE_FAIL;
157 goto error;
158 }
159 }
160
161 ret = LTTCOMM_OK;
162
163 error:
164 return ret;
165 }
166
167 /*
168 * Create kernel channel of the kernel session and notify kernel thread.
169 */
170 int channel_kernel_create(struct ltt_kernel_session *ksession,
171 struct lttng_channel *chan, int kernel_pipe)
172 {
173 int ret;
174 struct lttng_channel *attr = chan;
175
176 /* Creating channel attributes if needed */
177 if (attr == NULL) {
178 /* FIXME: this appears to be a memory leak */
179 attr = channel_new_default_attr(LTTNG_DOMAIN_KERNEL);
180 if (attr == NULL) {
181 ret = LTTCOMM_FATAL;
182 goto error;
183 }
184 }
185
186 /* Channel not found, creating it */
187 ret = kernel_create_channel(ksession, attr, ksession->trace_path);
188 if (ret < 0) {
189 ret = LTTCOMM_KERN_CHAN_FAIL;
190 goto error;
191 }
192
193 /* Notify kernel thread that there is a new channel */
194 ret = notify_thread_pipe(kernel_pipe);
195 if (ret < 0) {
196 ret = LTTCOMM_FATAL;
197 goto error;
198 }
199
200 ret = LTTCOMM_OK;
201
202 error:
203 return ret;
204 }
205
206 /*
207 * Create UST channel and enable it on the tracer.
208 */
209 int channel_ust_create(struct ltt_ust_session *usession,
210 struct lttng_channel *chan, int sock)
211 {
212 int ret;
213 struct lttng_channel *attr = chan;
214 struct ltt_ust_channel *suchan;
215 struct lttng_ust_channel_attr uattr;
216 struct object_data *obj;
217
218 /* Creating channel attributes if needed */
219 if (attr == NULL) {
220 /* FIXME: this appears to be a memory leak */
221 /* TODO: get default for other UST domains */
222 attr = channel_new_default_attr(LTTNG_DOMAIN_UST);
223 if (attr == NULL) {
224 ret = LTTCOMM_FATAL;
225 goto error;
226 }
227 }
228
229 suchan = trace_ust_create_channel(attr, usession->path);
230 if (suchan == NULL) {
231 ret = LTTCOMM_UST_CHAN_FAIL;
232 goto error;
233 }
234
235 uattr.overwrite = attr->attr.overwrite;
236 uattr.subbuf_size = attr->attr.subbuf_size;
237 uattr.num_subbuf = attr->attr.num_subbuf;
238 uattr.switch_timer_interval = attr->attr.switch_timer_interval;
239 uattr.read_timer_interval = attr->attr.read_timer_interval;
240 uattr.output = attr->attr.output;
241 ret = ustctl_create_channel(sock, usession->handle,
242 &uattr, &obj);
243 if (ret < 0) {
244 ret = LTTCOMM_UST_CHAN_FAIL;
245 goto error;
246 }
247
248 suchan->attr.overwrite = uattr.overwrite;
249 suchan->attr.subbuf_size = uattr.subbuf_size;
250 suchan->attr.num_subbuf = uattr.num_subbuf;
251 suchan->attr.switch_timer_interval = uattr.switch_timer_interval;
252 suchan->attr.read_timer_interval = uattr.read_timer_interval;
253 suchan->attr.output = uattr.output;
254 suchan->handle = obj->handle;
255 suchan->attr.shm_fd = obj->shm_fd;
256 suchan->attr.wait_fd = obj->wait_fd;
257 suchan->attr.memory_map_size = obj->memory_map_size;
258 suchan->obj = obj;
259
260 /* Add channel to session */
261 cds_list_add(&suchan->list, &usession->channels.head);
262 usession->channels.count++;
263
264 DBG2("Channel %s UST create successfully for sock:%d", suchan->name, sock);
265
266 ret = LTTCOMM_OK;
267
268 error:
269 return ret;
270 }
271
272 /*
273 * Enable UST channel on the tracer.
274 */
275 int channel_ust_enable(struct ltt_ust_session *usession,
276 struct ltt_ust_channel *uchan, int sock)
277 {
278 int ret = LTTCOMM_OK;
279 struct object_data obj;
280
281 obj.handle = uchan->handle;
282 obj.shm_fd = uchan->attr.shm_fd;
283 obj.wait_fd = uchan->attr.wait_fd;
284 obj.memory_map_size = uchan->attr.memory_map_size;
285 ret = ustctl_enable(sock, &obj);
286 if (ret < 0) {
287 ret = LTTCOMM_UST_CHAN_FAIL;
288 goto end;
289 }
290 ret = LTTCOMM_OK;
291 end:
292 return ret;
293 }
294
295 /*
296 * Disable UST channel on the tracer.
297 */
298 int channel_ust_disable(struct ltt_ust_session *usession,
299 struct ltt_ust_channel *uchan, int sock)
300 {
301 int ret = LTTCOMM_OK;
302 struct object_data obj;
303
304 obj.handle = uchan->handle;
305 obj.shm_fd = uchan->attr.shm_fd;
306 obj.wait_fd = uchan->attr.wait_fd;
307 obj.memory_map_size = uchan->attr.memory_map_size;
308 ret = ustctl_disable(sock, &obj);
309 if (ret < 0) {
310 ret = LTTCOMM_UST_CHAN_FAIL;
311 goto end;
312 }
313 ret = LTTCOMM_OK;
314 end:
315 return ret;
316 }
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