Preliminary work for full UST support
[lttng-tools.git] / ltt-sessiond / channel.c
CommitLineData
54d01ffb
DG
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
56fff090 18#include <string.h>
54d01ffb
DG
19#include <unistd.h>
20
21#include <lttng/lttng.h>
22#include <lttng-sessiond-comm.h>
23#include <lttngerr.h>
2bdd86d4
MD
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
54d01ffb
DG
31
32#include "channel.h"
f6a9efaa 33#include "hashtable.h"
54d01ffb 34#include "kernel-ctl.h"
44d3bd01 35#include "ust-ctl.h"
54d01ffb
DG
36#include "utils.h"
37
38/*
39 * Return allocated channel attributes.
40 */
f6cd6b0f 41struct lttng_channel *channel_new_default_attr(int dom)
54d01ffb
DG
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
44d3bd01
DG
51 if (snprintf(chan->name, sizeof(chan->name), "%s",
52 DEFAULT_CHANNEL_NAME) < 0) {
53 perror("snprintf default channel name");
54d01ffb
DG
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;
2bdd86d4 67 case LTTNG_DOMAIN_UST:
44d3bd01
DG
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;
54d01ffb
DG
73 default:
74 goto error; /* Not implemented */
75 }
76
77 return chan;
78
79error:
80 free(chan);
81error_alloc:
82 return NULL;
83}
84
56fff090
DG
85/*
86 * Copy two ltt ust channel. Dst and src must be already allocated.
87 */
88int channel_ust_copy(struct ltt_ust_channel *dst,
89 struct ltt_ust_channel *src)
90{
f6a9efaa 91 //struct ltt_ust_event *uevent, *new_uevent;
56fff090
DG
92
93 memcpy(dst, src, sizeof(struct ltt_ust_channel));
f6a9efaa 94 dst->events = hashtable_new_str(0);
56fff090 95
f6a9efaa 96 /*
56fff090
DG
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 }
f6a9efaa 108 */
56fff090
DG
109
110 return 0;
111
f6a9efaa
DG
112//error:
113// return -1;
56fff090
DG
114}
115
54d01ffb
DG
116/*
117 * Disable kernel channel of the kernel session.
118 */
119int 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
141error:
142 return ret;
143}
144
145/*
146 * Enable kernel channel of the kernel session.
147 */
148int 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
163error:
164 return ret;
165}
166
167/*
168 * Create kernel channel of the kernel session and notify kernel thread.
169 */
170int channel_kernel_create(struct ltt_kernel_session *ksession,
44d3bd01 171 struct lttng_channel *chan, int kernel_pipe)
54d01ffb
DG
172{
173 int ret;
174 struct lttng_channel *attr = chan;
175
176 /* Creating channel attributes if needed */
177 if (attr == NULL) {
2bdd86d4 178 /* FIXME: this appears to be a memory leak */
f6cd6b0f 179 attr = channel_new_default_attr(LTTNG_DOMAIN_KERNEL);
54d01ffb
DG
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
202error:
203 return ret;
204}
44d3bd01
DG
205
206/*
207 * Create UST channel and enable it on the tracer.
208 */
48842b30
DG
209int channel_ust_create(struct ltt_ust_session *usess,
210 struct lttng_channel *attr)
44d3bd01
DG
211{
212 int ret;
48842b30
DG
213 struct ltt_ust_channel *uchan;
214 //struct lttng_ust_channel_attr uattr;
215 //struct object_data *obj;
216
217 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
218 attr->name);
219 if (uchan == NULL) {
220 uchan = trace_ust_create_channel(attr, usess->pathname);
221 if (uchan == NULL) {
222 ret = LTTCOMM_UST_CHAN_FAIL;
44d3bd01
DG
223 goto error;
224 }
48842b30
DG
225 rcu_read_lock();
226 hashtable_add_unique(usess->domain_global.channels, &uchan->node);
227 rcu_read_unlock();
228 } else {
229 ret = LTTCOMM_UST_CHAN_EXIST;
2bdd86d4
MD
230 goto error;
231 }
f6a9efaa 232
48842b30
DG
233 /* TODO: NOTIFY ust application to update */
234 /*
235 ret = ustctl_create_channel(sock, usession->handle, &uattr, &obj);
44d3bd01
DG
236 if (ret < 0) {
237 ret = LTTCOMM_UST_CHAN_FAIL;
238 goto error;
239 }
48842b30 240 */
f6a9efaa 241
48842b30
DG
242 /*
243 uchan->attr.overwrite = uattr.overwrite;
244 uchan->attr.subbuf_size = uattr.subbuf_size;
245 uchan->attr.num_subbuf = uattr.num_subbuf;
246 uchan->attr.switch_timer_interval = uattr.switch_timer_interval;
247 uchan->attr.read_timer_interval = uattr.read_timer_interval;
248 uchan->attr.output = uattr.output;
249 uchan->handle = obj->handle;
250 uchan->attr.shm_fd = obj->shm_fd;
251 uchan->attr.wait_fd = obj->wait_fd;
252 uchan->attr.memory_map_size = obj->memory_map_size;
253 uchan->obj = obj;
254 */
2bdd86d4
MD
255
256 /* Add channel to session */
48842b30
DG
257 //rcu_read_lock();
258 //cds_list_add(&uchan->list, &usession->channels.head);
259 //usession->channels.count++;
260 //rcu_read_unlock();
2bdd86d4 261
48842b30 262 //DBG2("Channel %s UST create successfully for sock:%d", uchan->name, sock);
44d3bd01
DG
263
264 ret = LTTCOMM_OK;
265
266error:
267 return ret;
268}
269
270/*
271 * Enable UST channel on the tracer.
272 */
273int channel_ust_enable(struct ltt_ust_session *usession,
274 struct ltt_ust_channel *uchan, int sock)
275{
2bdd86d4 276 int ret = LTTCOMM_OK;
48842b30 277#ifdef DISABLE
2bdd86d4
MD
278 struct object_data obj;
279
2bdd86d4
MD
280 obj.shm_fd = uchan->attr.shm_fd;
281 obj.wait_fd = uchan->attr.wait_fd;
282 obj.memory_map_size = uchan->attr.memory_map_size;
283 ret = ustctl_enable(sock, &obj);
44d3bd01
DG
284 if (ret < 0) {
285 ret = LTTCOMM_UST_CHAN_FAIL;
2bdd86d4 286 goto end;
44d3bd01 287 }
44d3bd01 288 ret = LTTCOMM_OK;
2bdd86d4 289end:
48842b30 290#endif
44d3bd01
DG
291 return ret;
292}
293
294/*
295 * Disable UST channel on the tracer.
296 */
297int channel_ust_disable(struct ltt_ust_session *usession,
298 struct ltt_ust_channel *uchan, int sock)
299{
2bdd86d4 300 int ret = LTTCOMM_OK;
48842b30 301#ifdef DISABLE
2bdd86d4
MD
302 struct object_data obj;
303
2bdd86d4
MD
304 obj.shm_fd = uchan->attr.shm_fd;
305 obj.wait_fd = uchan->attr.wait_fd;
306 obj.memory_map_size = uchan->attr.memory_map_size;
307 ret = ustctl_disable(sock, &obj);
44d3bd01
DG
308 if (ret < 0) {
309 ret = LTTCOMM_UST_CHAN_FAIL;
2bdd86d4 310 goto end;
44d3bd01 311 }
44d3bd01 312 ret = LTTCOMM_OK;
2bdd86d4 313end:
48842b30 314#endif
44d3bd01
DG
315 return ret;
316}
This page took 0.055753 seconds and 4 git commands to generate.