Commit | Line | Data |
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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 | ||
7885e399 | 18 | #define _GNU_SOURCE |
56fff090 | 19 | #include <string.h> |
54d01ffb DG |
20 | #include <unistd.h> |
21 | ||
990570ed DG |
22 | #include <common/common.h> |
23 | #include <common/defaults.h> | |
db758600 | 24 | #include <common/sessiond-comm/sessiond-comm.h> |
54d01ffb DG |
25 | |
26 | #include "channel.h" | |
4771f025 | 27 | #include "kernel.h" |
44d3bd01 | 28 | #include "ust-ctl.h" |
54d01ffb | 29 | #include "utils.h" |
7885e399 | 30 | #include "ust-app.h" |
54d01ffb DG |
31 | |
32 | /* | |
33 | * Return allocated channel attributes. | |
34 | */ | |
f6cd6b0f | 35 | struct lttng_channel *channel_new_default_attr(int dom) |
54d01ffb DG |
36 | { |
37 | struct lttng_channel *chan; | |
38 | ||
39 | chan = zmalloc(sizeof(struct lttng_channel)); | |
40 | if (chan == NULL) { | |
7885e399 | 41 | PERROR("zmalloc channel init"); |
54d01ffb DG |
42 | goto error_alloc; |
43 | } | |
44 | ||
44d3bd01 DG |
45 | if (snprintf(chan->name, sizeof(chan->name), "%s", |
46 | DEFAULT_CHANNEL_NAME) < 0) { | |
7885e399 | 47 | PERROR("snprintf default channel name"); |
54d01ffb DG |
48 | goto error; |
49 | } | |
50 | ||
51 | chan->attr.overwrite = DEFAULT_CHANNEL_OVERWRITE; | |
52 | chan->attr.switch_timer_interval = DEFAULT_CHANNEL_SWITCH_TIMER; | |
53 | chan->attr.read_timer_interval = DEFAULT_CHANNEL_READ_TIMER; | |
54 | ||
55 | switch (dom) { | |
1b1c65fa MD |
56 | case LTTNG_DOMAIN_KERNEL: |
57 | chan->attr.subbuf_size = DEFAULT_KERNEL_CHANNEL_SUBBUF_SIZE; | |
58 | chan->attr.num_subbuf = DEFAULT_KERNEL_CHANNEL_SUBBUF_NUM; | |
59 | chan->attr.output = DEFAULT_KERNEL_CHANNEL_OUTPUT; | |
60 | break; | |
61 | case LTTNG_DOMAIN_UST: | |
62 | case LTTNG_DOMAIN_UST_PID: | |
63 | chan->attr.subbuf_size = DEFAULT_UST_CHANNEL_SUBBUF_SIZE; | |
64 | chan->attr.num_subbuf = DEFAULT_UST_CHANNEL_SUBBUF_NUM; | |
65 | chan->attr.output = DEFAULT_UST_CHANNEL_OUTPUT; | |
66 | break; | |
67 | default: | |
68 | goto error; /* Not implemented */ | |
54d01ffb DG |
69 | } |
70 | ||
71 | return chan; | |
72 | ||
73 | error: | |
74 | free(chan); | |
75 | error_alloc: | |
76 | return NULL; | |
77 | } | |
78 | ||
79 | /* | |
80 | * Disable kernel channel of the kernel session. | |
81 | */ | |
82 | int channel_kernel_disable(struct ltt_kernel_session *ksession, | |
83 | char *channel_name) | |
84 | { | |
85 | int ret; | |
86 | struct ltt_kernel_channel *kchan; | |
87 | ||
88 | kchan = trace_kernel_get_channel_by_name(channel_name, ksession); | |
89 | if (kchan == NULL) { | |
90 | ret = LTTCOMM_KERN_CHAN_NOT_FOUND; | |
91 | goto error; | |
92 | } else if (kchan->enabled == 1) { | |
93 | ret = kernel_disable_channel(kchan); | |
7885e399 DG |
94 | if (ret < 0 && ret != -EEXIST) { |
95 | ret = LTTCOMM_KERN_CHAN_DISABLE_FAIL; | |
54d01ffb DG |
96 | goto error; |
97 | } | |
98 | } | |
99 | ||
100 | ret = LTTCOMM_OK; | |
101 | ||
102 | error: | |
103 | return ret; | |
104 | } | |
105 | ||
106 | /* | |
107 | * Enable kernel channel of the kernel session. | |
108 | */ | |
109 | int channel_kernel_enable(struct ltt_kernel_session *ksession, | |
110 | struct ltt_kernel_channel *kchan) | |
111 | { | |
112 | int ret; | |
113 | ||
114 | if (kchan->enabled == 0) { | |
115 | ret = kernel_enable_channel(kchan); | |
116 | if (ret < 0) { | |
117 | ret = LTTCOMM_KERN_CHAN_ENABLE_FAIL; | |
118 | goto error; | |
119 | } | |
120 | } | |
121 | ||
122 | ret = LTTCOMM_OK; | |
123 | ||
124 | error: | |
125 | return ret; | |
126 | } | |
127 | ||
128 | /* | |
129 | * Create kernel channel of the kernel session and notify kernel thread. | |
130 | */ | |
131 | int channel_kernel_create(struct ltt_kernel_session *ksession, | |
ff4d74e6 | 132 | struct lttng_channel *attr, int kernel_pipe) |
54d01ffb DG |
133 | { |
134 | int ret; | |
ff4d74e6 | 135 | struct lttng_channel *defattr = NULL; |
54d01ffb DG |
136 | |
137 | /* Creating channel attributes if needed */ | |
138 | if (attr == NULL) { | |
ff4d74e6 MD |
139 | defattr = channel_new_default_attr(LTTNG_DOMAIN_KERNEL); |
140 | if (defattr == NULL) { | |
54d01ffb DG |
141 | ret = LTTCOMM_FATAL; |
142 | goto error; | |
143 | } | |
ff4d74e6 | 144 | attr = defattr; |
54d01ffb DG |
145 | } |
146 | ||
147 | /* Channel not found, creating it */ | |
148 | ret = kernel_create_channel(ksession, attr, ksession->trace_path); | |
149 | if (ret < 0) { | |
150 | ret = LTTCOMM_KERN_CHAN_FAIL; | |
151 | goto error; | |
152 | } | |
153 | ||
154 | /* Notify kernel thread that there is a new channel */ | |
155 | ret = notify_thread_pipe(kernel_pipe); | |
156 | if (ret < 0) { | |
157 | ret = LTTCOMM_FATAL; | |
158 | goto error; | |
159 | } | |
160 | ||
161 | ret = LTTCOMM_OK; | |
54d01ffb | 162 | error: |
ff4d74e6 | 163 | free(defattr); |
54d01ffb DG |
164 | return ret; |
165 | } | |
7885e399 DG |
166 | |
167 | /* | |
168 | * Enable UST channel for session and domain. | |
169 | */ | |
170 | int channel_ust_enable(struct ltt_ust_session *usess, int domain, | |
171 | struct ltt_ust_channel *uchan) | |
172 | { | |
173 | int ret = LTTCOMM_OK; | |
174 | ||
175 | /* If already enabled, everything is OK */ | |
176 | if (uchan->enabled) { | |
177 | DBG3("Channel %s already enabled. Skipping", uchan->name); | |
178 | goto end; | |
179 | } | |
180 | ||
181 | switch (domain) { | |
182 | case LTTNG_DOMAIN_UST: | |
183 | DBG2("Channel %s being enabled in UST global domain", uchan->name); | |
184 | /* Enable channel for global domain */ | |
185 | ret = ust_app_enable_channel_glb(usess, uchan); | |
186 | break; | |
187 | case LTTNG_DOMAIN_UST_PID: | |
188 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
189 | case LTTNG_DOMAIN_UST_EXEC_NAME: | |
190 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
191 | goto error; | |
192 | } | |
193 | ||
194 | if (ret < 0) { | |
195 | if (ret != -EEXIST) { | |
196 | ret = LTTCOMM_UST_CHAN_ENABLE_FAIL; | |
197 | goto error; | |
198 | } else { | |
199 | ret = LTTCOMM_OK; | |
200 | } | |
201 | } | |
202 | ||
203 | uchan->enabled = 1; | |
204 | DBG2("Channel %s enabled successfully", uchan->name); | |
205 | ||
206 | end: | |
207 | error: | |
208 | return ret; | |
209 | } | |
210 | ||
211 | /* | |
212 | * Create UST channel for session and domain. | |
213 | */ | |
214 | int channel_ust_create(struct ltt_ust_session *usess, int domain, | |
215 | struct lttng_channel *attr) | |
216 | { | |
217 | int ret = LTTCOMM_OK; | |
7885e399 DG |
218 | struct ltt_ust_channel *uchan = NULL; |
219 | struct lttng_channel *defattr = NULL; | |
220 | ||
221 | /* Creating channel attributes if needed */ | |
222 | if (attr == NULL) { | |
223 | defattr = channel_new_default_attr(domain); | |
224 | if (defattr == NULL) { | |
225 | ret = LTTCOMM_FATAL; | |
226 | goto error; | |
227 | } | |
228 | attr = defattr; | |
229 | } | |
230 | ||
231 | /* Create UST channel */ | |
232 | uchan = trace_ust_create_channel(attr, usess->pathname); | |
233 | if (uchan == NULL) { | |
234 | ret = LTTCOMM_FATAL; | |
235 | goto error; | |
236 | } | |
58f3ca76 | 237 | uchan->enabled = 1; |
7885e399 DG |
238 | |
239 | switch (domain) { | |
240 | case LTTNG_DOMAIN_UST: | |
241 | DBG2("Channel %s being created in UST global domain", uchan->name); | |
58f3ca76 | 242 | |
7885e399 DG |
243 | /* Enable channel for global domain */ |
244 | ret = ust_app_create_channel_glb(usess, uchan); | |
245 | break; | |
246 | case LTTNG_DOMAIN_UST_PID: | |
247 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
248 | case LTTNG_DOMAIN_UST_EXEC_NAME: | |
249 | default: | |
250 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
251 | goto error_free_chan; | |
252 | } | |
253 | ||
254 | if (ret < 0 && ret != -EEXIST) { | |
255 | ret = LTTCOMM_UST_CHAN_ENABLE_FAIL; | |
256 | goto error_free_chan; | |
257 | } | |
258 | ||
fc34caaa DG |
259 | /* Adding the channel to the channel hash table. */ |
260 | rcu_read_lock(); | |
261 | lttng_ht_add_unique_str(usess->domain_global.channels, &uchan->node); | |
262 | rcu_read_unlock(); | |
263 | ||
7885e399 DG |
264 | DBG2("Channel %s created successfully", uchan->name); |
265 | ||
266 | free(defattr); | |
267 | return LTTCOMM_OK; | |
268 | ||
269 | error_free_chan: | |
24d1723f DG |
270 | /* |
271 | * No need to remove the channel from the hash table because at this point | |
272 | * it was not added hence the direct call and no call_rcu(). | |
273 | */ | |
7885e399 DG |
274 | trace_ust_destroy_channel(uchan); |
275 | error: | |
276 | free(defattr); | |
277 | return ret; | |
278 | } | |
279 | ||
280 | /* | |
281 | * Disable UST channel for session and domain. | |
282 | */ | |
283 | int channel_ust_disable(struct ltt_ust_session *usess, int domain, | |
284 | struct ltt_ust_channel *uchan) | |
285 | { | |
286 | int ret = LTTCOMM_OK; | |
7885e399 DG |
287 | |
288 | /* Already disabled */ | |
289 | if (uchan->enabled == 0) { | |
290 | DBG2("Channel UST %s already disabled", uchan->name); | |
291 | goto end; | |
292 | } | |
293 | ||
294 | /* Get the right channel's hashtable */ | |
295 | switch (domain) { | |
296 | case LTTNG_DOMAIN_UST: | |
297 | DBG2("Channel %s being disabled in UST global domain", uchan->name); | |
7885e399 DG |
298 | /* Disable channel for global domain */ |
299 | ret = ust_app_disable_channel_glb(usess, uchan); | |
300 | break; | |
301 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
302 | case LTTNG_DOMAIN_UST_EXEC_NAME: | |
303 | case LTTNG_DOMAIN_UST_PID: | |
304 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
305 | goto error; | |
306 | } | |
307 | ||
308 | if (ret < 0 && ret != -EEXIST) { | |
309 | ret = LTTCOMM_UST_DISABLE_FAIL; | |
310 | goto error; | |
311 | } | |
312 | ||
313 | uchan->enabled = 0; | |
314 | ||
315 | DBG2("Channel %s disabled successfully", uchan->name); | |
316 | ||
317 | return LTTCOMM_OK; | |
318 | ||
319 | end: | |
320 | error: | |
321 | return ret; | |
322 | } |