Commit | Line | Data |
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54d01ffb DG |
1 | /* |
2 | * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca> | |
3 | * | |
d14d33bf AM |
4 | * This program is free software; you can redistribute it and/or modify |
5 | * it under the terms of the GNU General Public License, version 2 only, | |
6 | * as published by the Free Software Foundation. | |
54d01ffb | 7 | * |
d14d33bf AM |
8 | * This program is distributed in the hope that it will be useful, |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
11 | * GNU General Public License for more details. | |
54d01ffb | 12 | * |
d14d33bf AM |
13 | * You should have received a copy of the GNU General Public License along |
14 | * with this program; if not, write to the Free Software Foundation, Inc., | |
15 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
54d01ffb DG |
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: | |
d78d6610 | 62 | #if 0 |
1b1c65fa | 63 | case LTTNG_DOMAIN_UST_PID: |
d78d6610 DG |
64 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: |
65 | case LTTNG_DOMAIN_UST_EXEC_NAME: | |
66 | #endif | |
1b1c65fa MD |
67 | chan->attr.subbuf_size = DEFAULT_UST_CHANNEL_SUBBUF_SIZE; |
68 | chan->attr.num_subbuf = DEFAULT_UST_CHANNEL_SUBBUF_NUM; | |
69 | chan->attr.output = DEFAULT_UST_CHANNEL_OUTPUT; | |
70 | break; | |
71 | default: | |
72 | goto error; /* Not implemented */ | |
54d01ffb DG |
73 | } |
74 | ||
75 | return chan; | |
76 | ||
77 | error: | |
78 | free(chan); | |
79 | error_alloc: | |
80 | return NULL; | |
81 | } | |
82 | ||
83 | /* | |
84 | * Disable kernel channel of the kernel session. | |
85 | */ | |
86 | int channel_kernel_disable(struct ltt_kernel_session *ksession, | |
87 | char *channel_name) | |
88 | { | |
89 | int ret; | |
90 | struct ltt_kernel_channel *kchan; | |
91 | ||
92 | kchan = trace_kernel_get_channel_by_name(channel_name, ksession); | |
93 | if (kchan == NULL) { | |
f73fabfd | 94 | ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND; |
54d01ffb DG |
95 | goto error; |
96 | } else if (kchan->enabled == 1) { | |
97 | ret = kernel_disable_channel(kchan); | |
7885e399 | 98 | if (ret < 0 && ret != -EEXIST) { |
f73fabfd | 99 | ret = LTTNG_ERR_KERN_CHAN_DISABLE_FAIL; |
54d01ffb DG |
100 | goto error; |
101 | } | |
102 | } | |
103 | ||
f73fabfd | 104 | ret = LTTNG_OK; |
54d01ffb DG |
105 | |
106 | error: | |
107 | return ret; | |
108 | } | |
109 | ||
110 | /* | |
111 | * Enable kernel channel of the kernel session. | |
112 | */ | |
113 | int channel_kernel_enable(struct ltt_kernel_session *ksession, | |
114 | struct ltt_kernel_channel *kchan) | |
115 | { | |
116 | int ret; | |
117 | ||
118 | if (kchan->enabled == 0) { | |
119 | ret = kernel_enable_channel(kchan); | |
120 | if (ret < 0) { | |
f73fabfd | 121 | ret = LTTNG_ERR_KERN_CHAN_ENABLE_FAIL; |
54d01ffb DG |
122 | goto error; |
123 | } | |
42224349 | 124 | } else { |
f73fabfd | 125 | ret = LTTNG_ERR_KERN_CHAN_EXIST; |
42224349 | 126 | goto error; |
54d01ffb DG |
127 | } |
128 | ||
f73fabfd | 129 | ret = LTTNG_OK; |
54d01ffb DG |
130 | |
131 | error: | |
132 | return ret; | |
133 | } | |
134 | ||
135 | /* | |
136 | * Create kernel channel of the kernel session and notify kernel thread. | |
137 | */ | |
138 | int channel_kernel_create(struct ltt_kernel_session *ksession, | |
ff4d74e6 | 139 | struct lttng_channel *attr, int kernel_pipe) |
54d01ffb DG |
140 | { |
141 | int ret; | |
ff4d74e6 | 142 | struct lttng_channel *defattr = NULL; |
54d01ffb DG |
143 | |
144 | /* Creating channel attributes if needed */ | |
145 | if (attr == NULL) { | |
ff4d74e6 MD |
146 | defattr = channel_new_default_attr(LTTNG_DOMAIN_KERNEL); |
147 | if (defattr == NULL) { | |
f73fabfd | 148 | ret = LTTNG_ERR_FATAL; |
54d01ffb DG |
149 | goto error; |
150 | } | |
ff4d74e6 | 151 | attr = defattr; |
54d01ffb DG |
152 | } |
153 | ||
154 | /* Channel not found, creating it */ | |
155 | ret = kernel_create_channel(ksession, attr, ksession->trace_path); | |
156 | if (ret < 0) { | |
f73fabfd | 157 | ret = LTTNG_ERR_KERN_CHAN_FAIL; |
54d01ffb DG |
158 | goto error; |
159 | } | |
160 | ||
161 | /* Notify kernel thread that there is a new channel */ | |
162 | ret = notify_thread_pipe(kernel_pipe); | |
163 | if (ret < 0) { | |
f73fabfd | 164 | ret = LTTNG_ERR_FATAL; |
54d01ffb DG |
165 | goto error; |
166 | } | |
167 | ||
f73fabfd | 168 | ret = LTTNG_OK; |
54d01ffb | 169 | error: |
ff4d74e6 | 170 | free(defattr); |
54d01ffb DG |
171 | return ret; |
172 | } | |
7885e399 DG |
173 | |
174 | /* | |
175 | * Enable UST channel for session and domain. | |
176 | */ | |
177 | int channel_ust_enable(struct ltt_ust_session *usess, int domain, | |
178 | struct ltt_ust_channel *uchan) | |
179 | { | |
f73fabfd | 180 | int ret = LTTNG_OK; |
7885e399 DG |
181 | |
182 | /* If already enabled, everything is OK */ | |
183 | if (uchan->enabled) { | |
184 | DBG3("Channel %s already enabled. Skipping", uchan->name); | |
f73fabfd | 185 | ret = LTTNG_ERR_UST_CHAN_EXIST; |
7885e399 DG |
186 | goto end; |
187 | } | |
188 | ||
189 | switch (domain) { | |
190 | case LTTNG_DOMAIN_UST: | |
191 | DBG2("Channel %s being enabled in UST global domain", uchan->name); | |
192 | /* Enable channel for global domain */ | |
193 | ret = ust_app_enable_channel_glb(usess, uchan); | |
194 | break; | |
d78d6610 | 195 | #if 0 |
7885e399 DG |
196 | case LTTNG_DOMAIN_UST_PID: |
197 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
198 | case LTTNG_DOMAIN_UST_EXEC_NAME: | |
d78d6610 DG |
199 | #endif |
200 | default: | |
f73fabfd | 201 | ret = LTTNG_ERR_UND; |
7885e399 DG |
202 | goto error; |
203 | } | |
204 | ||
205 | if (ret < 0) { | |
206 | if (ret != -EEXIST) { | |
f73fabfd | 207 | ret = LTTNG_ERR_UST_CHAN_ENABLE_FAIL; |
7885e399 DG |
208 | goto error; |
209 | } else { | |
f73fabfd | 210 | ret = LTTNG_OK; |
7885e399 DG |
211 | } |
212 | } | |
213 | ||
214 | uchan->enabled = 1; | |
215 | DBG2("Channel %s enabled successfully", uchan->name); | |
216 | ||
217 | end: | |
218 | error: | |
219 | return ret; | |
220 | } | |
221 | ||
222 | /* | |
223 | * Create UST channel for session and domain. | |
224 | */ | |
225 | int channel_ust_create(struct ltt_ust_session *usess, int domain, | |
226 | struct lttng_channel *attr) | |
227 | { | |
f73fabfd | 228 | int ret = LTTNG_OK; |
7885e399 DG |
229 | struct ltt_ust_channel *uchan = NULL; |
230 | struct lttng_channel *defattr = NULL; | |
231 | ||
232 | /* Creating channel attributes if needed */ | |
233 | if (attr == NULL) { | |
234 | defattr = channel_new_default_attr(domain); | |
235 | if (defattr == NULL) { | |
f73fabfd | 236 | ret = LTTNG_ERR_FATAL; |
7885e399 DG |
237 | goto error; |
238 | } | |
239 | attr = defattr; | |
240 | } | |
241 | ||
b024d072 MD |
242 | /* |
243 | * Validate UST buffer size and number of buffers: must both be | |
244 | * power of 2 and nonzero. We validate right here for UST, | |
245 | * because applications will not report the error to the user | |
246 | * (unlike kernel tracing). | |
247 | */ | |
248 | if (!attr->attr.subbuf_size || (attr->attr.subbuf_size & (attr->attr.subbuf_size - 1))) { | |
f73fabfd | 249 | ret = LTTNG_ERR_INVALID; |
b024d072 MD |
250 | goto error; |
251 | } | |
252 | if (!attr->attr.num_subbuf || (attr->attr.num_subbuf & (attr->attr.num_subbuf - 1))) { | |
f73fabfd | 253 | ret = LTTNG_ERR_INVALID; |
b024d072 MD |
254 | goto error; |
255 | } | |
256 | ||
7885e399 DG |
257 | /* Create UST channel */ |
258 | uchan = trace_ust_create_channel(attr, usess->pathname); | |
259 | if (uchan == NULL) { | |
f73fabfd | 260 | ret = LTTNG_ERR_FATAL; |
7885e399 DG |
261 | goto error; |
262 | } | |
58f3ca76 | 263 | uchan->enabled = 1; |
7885e399 DG |
264 | |
265 | switch (domain) { | |
266 | case LTTNG_DOMAIN_UST: | |
267 | DBG2("Channel %s being created in UST global domain", uchan->name); | |
58f3ca76 | 268 | |
7885e399 DG |
269 | /* Enable channel for global domain */ |
270 | ret = ust_app_create_channel_glb(usess, uchan); | |
271 | break; | |
d78d6610 | 272 | #if 0 |
7885e399 DG |
273 | case LTTNG_DOMAIN_UST_PID: |
274 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
275 | case LTTNG_DOMAIN_UST_EXEC_NAME: | |
d78d6610 | 276 | #endif |
7885e399 | 277 | default: |
f73fabfd | 278 | ret = LTTNG_ERR_UND; |
7885e399 DG |
279 | goto error_free_chan; |
280 | } | |
281 | ||
282 | if (ret < 0 && ret != -EEXIST) { | |
f73fabfd | 283 | ret = LTTNG_ERR_UST_CHAN_FAIL; |
7885e399 DG |
284 | goto error_free_chan; |
285 | } | |
286 | ||
fc34caaa DG |
287 | /* Adding the channel to the channel hash table. */ |
288 | rcu_read_lock(); | |
289 | lttng_ht_add_unique_str(usess->domain_global.channels, &uchan->node); | |
290 | rcu_read_unlock(); | |
291 | ||
7885e399 DG |
292 | DBG2("Channel %s created successfully", uchan->name); |
293 | ||
294 | free(defattr); | |
f73fabfd | 295 | return LTTNG_OK; |
7885e399 DG |
296 | |
297 | error_free_chan: | |
24d1723f DG |
298 | /* |
299 | * No need to remove the channel from the hash table because at this point | |
300 | * it was not added hence the direct call and no call_rcu(). | |
301 | */ | |
7885e399 DG |
302 | trace_ust_destroy_channel(uchan); |
303 | error: | |
304 | free(defattr); | |
305 | return ret; | |
306 | } | |
307 | ||
308 | /* | |
309 | * Disable UST channel for session and domain. | |
310 | */ | |
311 | int channel_ust_disable(struct ltt_ust_session *usess, int domain, | |
312 | struct ltt_ust_channel *uchan) | |
313 | { | |
f73fabfd | 314 | int ret = LTTNG_OK; |
7885e399 DG |
315 | |
316 | /* Already disabled */ | |
317 | if (uchan->enabled == 0) { | |
318 | DBG2("Channel UST %s already disabled", uchan->name); | |
319 | goto end; | |
320 | } | |
321 | ||
322 | /* Get the right channel's hashtable */ | |
323 | switch (domain) { | |
324 | case LTTNG_DOMAIN_UST: | |
325 | DBG2("Channel %s being disabled in UST global domain", uchan->name); | |
7885e399 DG |
326 | /* Disable channel for global domain */ |
327 | ret = ust_app_disable_channel_glb(usess, uchan); | |
328 | break; | |
d78d6610 | 329 | #if 0 |
7885e399 DG |
330 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: |
331 | case LTTNG_DOMAIN_UST_EXEC_NAME: | |
332 | case LTTNG_DOMAIN_UST_PID: | |
d78d6610 DG |
333 | #endif |
334 | default: | |
f73fabfd | 335 | ret = LTTNG_ERR_UND; |
7885e399 DG |
336 | goto error; |
337 | } | |
338 | ||
339 | if (ret < 0 && ret != -EEXIST) { | |
f73fabfd | 340 | ret = LTTNG_ERR_UST_CHAN_DISABLE_FAIL; |
7885e399 DG |
341 | goto error; |
342 | } | |
343 | ||
344 | uchan->enabled = 0; | |
345 | ||
346 | DBG2("Channel %s disabled successfully", uchan->name); | |
347 | ||
f73fabfd | 348 | return LTTNG_OK; |
7885e399 DG |
349 | |
350 | end: | |
351 | error: | |
352 | return ret; | |
353 | } |