Fix double PID registration race
[lttng-tools.git] / src / bin / lttng-sessiond / ust-app.h
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
5 * it under the terms of the GNU General Public License, version 2 only,
6 * as published by the Free Software Foundation.
7 *
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.
12 *
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.
16 */
17
18 #ifndef _LTT_UST_APP_H
19 #define _LTT_UST_APP_H
20
21 #include <stdint.h>
22
23 #include "trace-ust.h"
24
25 /* lttng-ust supported version. */
26 #define LTTNG_UST_COMM_MAJOR 2 /* comm protocol major version */
27 #define UST_APP_MAJOR_VERSION 2 /* UST version supported */
28
29 #define UST_APP_EVENT_LIST_SIZE 32
30
31 extern int ust_consumerd64_fd, ust_consumerd32_fd;
32
33 /*
34 * Application registration data structure.
35 */
36 struct ust_register_msg {
37 uint32_t major;
38 uint32_t minor;
39 pid_t pid;
40 pid_t ppid;
41 uid_t uid;
42 gid_t gid;
43 uint32_t bits_per_long;
44 char name[16];
45 };
46
47 /*
48 * Global applications HT used by the session daemon. This table is indexed by
49 * PID using the pid_n node and pid value of an ust_app.
50 */
51 struct lttng_ht *ust_app_ht;
52
53 /*
54 * Global applications HT used by the session daemon. This table is indexed by
55 * socket using the sock_n node and sock value of an ust_app.
56 */
57 struct lttng_ht *ust_app_ht_by_sock;
58
59 struct ust_app_ctx {
60 int handle;
61 struct lttng_ust_context ctx;
62 struct lttng_ust_object_data *obj;
63 struct lttng_ht_node_ulong node;
64 };
65
66 struct ust_app_event {
67 int enabled;
68 int handle;
69 struct lttng_ust_object_data *obj;
70 struct lttng_ust_event attr;
71 char name[LTTNG_UST_SYM_NAME_LEN];
72 struct lttng_ht *ctx;
73 struct lttng_ht_node_str node;
74 };
75
76 struct ust_app_channel {
77 int enabled;
78 int handle;
79 char name[LTTNG_UST_SYM_NAME_LEN];
80 struct lttng_ust_channel attr;
81 struct lttng_ust_object_data *obj;
82 struct ltt_ust_stream_list streams;
83 struct lttng_ht *ctx;
84 struct lttng_ht *events;
85 struct lttng_ht_node_str node;
86 };
87
88 struct ust_app_session {
89 int enabled;
90 /* started: has the session been in started state at any time ? */
91 int started; /* allows detection of start vs restart. */
92 int handle; /* used has unique identifier for app session */
93 int id; /* session unique identifier */
94 struct ltt_ust_metadata *metadata;
95 struct lttng_ht *channels; /* Registered channels */
96 struct lttng_ht_node_ulong node;
97 char path[PATH_MAX];
98 /* UID/GID of the user owning the session */
99 uid_t uid;
100 gid_t gid;
101 };
102
103 /*
104 * Registered traceable applications. Libust registers to the session daemon
105 * and a linked list is kept of all running traceable app.
106 */
107 struct ust_app {
108 int sock;
109 pid_t pid;
110 pid_t ppid;
111 uid_t uid; /* User ID that owns the apps */
112 gid_t gid; /* Group ID that owns the apps */
113 int bits_per_long;
114 int compatible; /* If the lttng-ust tracer version does not match the
115 supported version of the session daemon, this flag is
116 set to 0 (NOT compatible) else 1. */
117 struct lttng_ust_tracer_version version;
118 uint32_t v_major; /* Verion major number */
119 uint32_t v_minor; /* Verion minor number */
120 char name[17]; /* Process name (short) */
121 struct lttng_ht *sessions;
122 struct lttng_ht_node_ulong pid_n;
123 struct lttng_ht_node_ulong sock_n;
124 };
125
126 #ifdef HAVE_LIBLTTNG_UST_CTL
127
128 int ust_app_register(struct ust_register_msg *msg, int sock);
129 static inline
130 int ust_app_register_done(int sock)
131 {
132 return ustctl_register_done(sock);
133 }
134 void ust_app_unregister(int sock);
135 unsigned long ust_app_list_count(void);
136 int ust_app_start_trace(struct ltt_ust_session *usess, struct ust_app *app);
137 int ust_app_stop_trace(struct ltt_ust_session *usess, struct ust_app *app);
138 int ust_app_start_trace_all(struct ltt_ust_session *usess);
139 int ust_app_stop_trace_all(struct ltt_ust_session *usess);
140 int ust_app_destroy_trace(struct ltt_ust_session *usess, struct ust_app *app);
141 int ust_app_destroy_trace_all(struct ltt_ust_session *usess);
142 int ust_app_list_events(struct lttng_event **events);
143 int ust_app_create_channel_glb(struct ltt_ust_session *usess,
144 struct ltt_ust_channel *uchan);
145 int ust_app_create_event_glb(struct ltt_ust_session *usess,
146 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent);
147 int ust_app_disable_event_pid(struct ltt_ust_session *usess,
148 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent,
149 pid_t pid);
150 int ust_app_enable_event_pid(struct ltt_ust_session *usess,
151 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent,
152 pid_t pid);
153 int ust_app_disable_channel_glb(struct ltt_ust_session *usess,
154 struct ltt_ust_channel *uchan);
155 int ust_app_enable_channel_glb(struct ltt_ust_session *usess,
156 struct ltt_ust_channel *uchan);
157 int ust_app_enable_event_glb(struct ltt_ust_session *usess,
158 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent);
159 int ust_app_disable_all_event_glb(struct ltt_ust_session *usess,
160 struct ltt_ust_channel *uchan);
161 int ust_app_enable_all_event_glb(struct ltt_ust_session *usess,
162 struct ltt_ust_channel *uchan);
163 int ust_app_disable_event_glb(struct ltt_ust_session *usess,
164 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent);
165 int ust_app_add_ctx_event_glb(struct ltt_ust_session *usess,
166 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent,
167 struct ltt_ust_context *uctx);
168 int ust_app_add_ctx_channel_glb(struct ltt_ust_session *usess,
169 struct ltt_ust_channel *uchan, struct ltt_ust_context *uctx);
170 void ust_app_global_update(struct ltt_ust_session *usess, int sock);
171
172 void ust_app_clean_list(void);
173 void ust_app_ht_alloc(void);
174 struct lttng_ht *ust_app_get_ht(void);
175 struct ust_app *ust_app_find_by_pid(pid_t pid);
176 int ust_app_validate_version(int sock);
177 int ust_app_calibrate_glb(struct lttng_ust_calibrate *calibrate);
178
179 #else /* HAVE_LIBLTTNG_UST_CTL */
180
181 static inline
182 int ust_app_destroy_trace_all(struct ltt_ust_session *usess)
183 {
184 return 0;
185 }
186 static inline
187 int ust_app_start_trace(struct ltt_ust_session *usess, struct ust_app *app)
188 {
189 return 0;
190 }
191 static inline
192 int ust_app_start_trace_all(struct ltt_ust_session *usess)
193 {
194 return 0;
195 }
196 static inline
197 int ust_app_stop_trace_all(struct ltt_ust_session *usess)
198 {
199 return 0;
200 }
201 static inline
202 int ust_app_list_events(struct lttng_event **events)
203 {
204 return 0;
205 }
206 static inline
207 int ust_app_register(struct ust_register_msg *msg, int sock)
208 {
209 return -ENOSYS;
210 }
211 static inline
212 int ust_app_register_done(int sock)
213 {
214 return -ENOSYS;
215 }
216 static inline
217 void ust_app_unregister(int sock)
218 {
219 }
220 static inline
221 unsigned int ust_app_list_count(void)
222 {
223 return 0;
224 }
225 static inline
226 void ust_app_lock_list(void)
227 {
228 }
229 static inline
230 void ust_app_unlock_list(void)
231 {
232 }
233 static inline
234 void ust_app_clean_list(void)
235 {
236 }
237 static inline
238 struct ust_app_list *ust_app_get_list(void)
239 {
240 return NULL;
241 }
242 static inline
243 struct ust_app *ust_app_get_by_pid(pid_t pid)
244 {
245 return NULL;
246 }
247 static inline
248 struct lttng_ht *ust_app_get_ht(void)
249 {
250 return NULL;
251 }
252 static inline
253 void ust_app_ht_alloc(void)
254 {}
255 static inline
256 void ust_app_global_update(struct ltt_ust_session *usess, int sock)
257 {}
258 static inline
259 int ust_app_disable_channel_glb(struct ltt_ust_session *usess,
260 struct ltt_ust_channel *uchan)
261 {
262 return 0;
263 }
264 static inline
265 int ust_app_enable_channel_glb(struct ltt_ust_session *usess,
266 struct ltt_ust_channel *uchan)
267 {
268 return 0;
269 }
270 static inline
271 int ust_app_create_channel_glb(struct ltt_ust_session *usess,
272 struct ltt_ust_channel *uchan)
273 {
274 return 0;
275 }
276 static inline
277 int ust_app_disable_all_event_glb(struct ltt_ust_session *usess,
278 struct ltt_ust_channel *uchan)
279 {
280 return 0;
281 }
282 static inline
283 int ust_app_enable_all_event_glb(struct ltt_ust_session *usess,
284 struct ltt_ust_channel *uchan)
285 {
286 return 0;
287 }
288 static inline
289 int ust_app_create_event_glb(struct ltt_ust_session *usess,
290 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent)
291 {
292 return 0;
293 }
294 static inline
295 int ust_app_disable_event_glb(struct ltt_ust_session *usess,
296 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent)
297 {
298 return 0;
299 }
300 static inline
301 int ust_app_enable_event_glb(struct ltt_ust_session *usess,
302 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent)
303 {
304 return 0;
305 }
306 static inline
307 int ust_app_add_ctx_event_glb(struct ltt_ust_session *usess,
308 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent,
309 struct ltt_ust_context *uctx)
310 {
311 return 0;
312 }
313 static inline
314 int ust_app_add_ctx_channel_glb(struct ltt_ust_session *usess,
315 struct ltt_ust_channel *uchan, struct ltt_ust_context *uctx)
316 {
317 return 0;
318 }
319 static inline
320 int ust_app_enable_event_pid(struct ltt_ust_session *usess,
321 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent,
322 pid_t pid)
323 {
324 return 0;
325 }
326 static inline
327 int ust_app_disable_event_pid(struct ltt_ust_session *usess,
328 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent,
329 pid_t pid)
330 {
331 return 0;
332 }
333 static inline
334 int ust_app_validate_version(int sock)
335 {
336 return 0;
337 }
338 static inline
339 int ust_app_calibrate_glb(struct lttng_ust_calibrate *calibrate)
340 {
341 return 0;
342 }
343
344 #endif /* HAVE_LIBLTTNG_UST_CTL */
345
346 #endif /* _LTT_UST_APP_H */
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