Commit | Line | Data |
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91d76f53 | 1 | /* |
5b74c7b1 DG |
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. | |
5b74c7b1 DG |
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 | * | |
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. | |
5b74c7b1 DG |
16 | */ |
17 | ||
18 | #ifndef _LTT_SESSION_H | |
19 | #define _LTT_SESSION_H | |
20 | ||
73184835 | 21 | #include <limits.h> |
5c408ad8 | 22 | #include <stdbool.h> |
20fe2104 | 23 | #include <urcu/list.h> |
d4a2a84a | 24 | |
6dc3064a | 25 | #include <common/hashtable/hashtable.h> |
db66e574 | 26 | #include <lttng/rotation.h> |
5d65beab | 27 | #include <lttng/location.h> |
6dc3064a DG |
28 | |
29 | #include "snapshot.h" | |
00187dd4 | 30 | #include "trace-kernel.h" |
dd73d57b | 31 | #include "consumer.h" |
7972aab2 DG |
32 | |
33 | struct ltt_ust_session; | |
00187dd4 | 34 | |
b5541356 DG |
35 | /* |
36 | * Tracing session list | |
37 | * | |
38 | * Statically declared in session.c and can be accessed by using | |
54d01ffb | 39 | * session_get_list() function that returns the pointer to the list. |
b5541356 | 40 | */ |
5b74c7b1 | 41 | struct ltt_session_list { |
b5541356 | 42 | /* |
a24f7994 MD |
43 | * This lock protects any read/write access to the list and |
44 | * next_uuid. All public functions in session.c acquire this | |
45 | * lock and release it before returning. If none of those | |
46 | * functions are used, the lock MUST be acquired in order to | |
47 | * iterate or/and do any actions on that list. | |
b5541356 DG |
48 | */ |
49 | pthread_mutex_t lock; | |
99d688f2 JG |
50 | /* |
51 | * This condition variable is signaled on every removal from | |
52 | * the session list. | |
53 | */ | |
54 | pthread_cond_t removal_cond; | |
6c9cc2ab | 55 | |
b5541356 | 56 | /* |
a24f7994 MD |
57 | * Session unique ID generator. The session list lock MUST be |
58 | * upon update and read of this counter. | |
b5541356 | 59 | */ |
d022620a | 60 | uint64_t next_uuid; |
6c9cc2ab DG |
61 | |
62 | /* Linked list head */ | |
5b74c7b1 DG |
63 | struct cds_list_head head; |
64 | }; | |
65 | ||
b5541356 DG |
66 | /* |
67 | * This data structure contains information needed to identify a tracing | |
68 | * session for both LTTng and UST. | |
5b74c7b1 DG |
69 | */ |
70 | struct ltt_session { | |
74babd95 | 71 | char name[NAME_MAX]; |
73184835 | 72 | char hostname[HOST_NAME_MAX]; /* Local hostname. */ |
20fe2104 | 73 | struct ltt_kernel_session *kernel_session; |
f6a9efaa | 74 | struct ltt_ust_session *ust_session; |
e32d7f27 | 75 | struct urcu_ref ref; |
b5541356 DG |
76 | /* |
77 | * Protect any read/write on this session data structure. This lock must be | |
78 | * acquired *before* using any public functions declared below. Use | |
54d01ffb | 79 | * session_lock() and session_unlock() for that. |
b5541356 DG |
80 | */ |
81 | pthread_mutex_t lock; | |
82 | struct cds_list_head list; | |
d022620a | 83 | uint64_t id; /* session unique identifier */ |
f4cc5e83 JG |
84 | /* Indicates if the session has been added to the session list and ht.*/ |
85 | bool published; | |
e32d7f27 JG |
86 | /* Indicates if a destroy command has been applied to this session. */ |
87 | bool destroyed; | |
6df2e2c9 MD |
88 | /* UID/GID of the user owning the session */ |
89 | uid_t uid; | |
90 | gid_t gid; | |
00e2e675 DG |
91 | /* |
92 | * Network session handle. A value of 0 means that there is no remote | |
93 | * session established. | |
94 | */ | |
95 | uint64_t net_handle; | |
96 | /* | |
97 | * This consumer is only set when the create_session_uri call is made. | |
98 | * This contains the temporary information for a consumer output. Upon | |
99 | * creation of the UST or kernel session, this consumer, if available, is | |
100 | * copied into those sessions. | |
101 | */ | |
102 | struct consumer_output *consumer; | |
a4b92340 | 103 | |
8382cf6f DG |
104 | /* Did at least ONE start command has been triggered?. */ |
105 | unsigned int has_been_started:1; | |
106 | /* | |
107 | * Is the session active? Start trace command sets this to 1 and the stop | |
108 | * command reset it to 0. | |
109 | */ | |
110 | unsigned int active:1; | |
6dc3064a DG |
111 | |
112 | /* Snapshot representation in a session. */ | |
113 | struct snapshot snapshot; | |
114 | /* Indicate if the session has to output the traces or not. */ | |
115 | unsigned int output_traces; | |
27babd3a DG |
116 | /* |
117 | * This session is in snapshot mode. This means that every channel enabled | |
118 | * will be set in overwrite mode and mmap. It is considered exclusively for | |
119 | * snapshot purposes. | |
120 | */ | |
121 | unsigned int snapshot_mode; | |
ecc48a90 JD |
122 | /* |
123 | * Timer set when the session is created for live reading. | |
124 | */ | |
d98ad589 | 125 | unsigned int live_timer; |
d7ba1388 MD |
126 | /* |
127 | * Path where to keep the shared memory files. | |
128 | */ | |
129 | char shm_path[PATH_MAX]; | |
23324029 JD |
130 | /* |
131 | * Node in ltt_sessions_ht_by_id. | |
132 | */ | |
133 | struct lttng_ht_node_u64 node; | |
ad9f5c17 JG |
134 | /* |
135 | * The current archive id corresponds to the number of session rotations | |
a9577b76 | 136 | * that have occurred for this session. The archive id |
ad9f5c17 JG |
137 | * is used to tag the "generation" of a stream. This tag allows the |
138 | * consumer and relay daemons to track when a given stream was created | |
139 | * during the lifetime of a session. | |
140 | * | |
141 | * For instance, if a stream is created after a session rotation was | |
142 | * launched, the consumer and relay daemons must not check its position | |
143 | * to determine if that specific session rotation was completed. It is | |
144 | * implicitly "completed" since the stream appeared _after_ the session | |
145 | * rotation was initiated. | |
146 | */ | |
147 | uint64_t current_archive_id; | |
db66e574 | 148 | /* |
92816cc3 JG |
149 | * Rotation is considered pending between the time it is launched up |
150 | * until the moment when the data has been writen at the destination | |
151 | * and the trace archive has been renamed. | |
152 | * | |
153 | * When tracing locally, only 'rotation_pending_local' is used since | |
154 | * no remote checks are needed. However, when tracing to a relay daemon, | |
155 | * a second check is needed to ensure that the data has been | |
156 | * commited at the remote destination. | |
5c408ad8 | 157 | */ |
92816cc3 JG |
158 | bool rotation_pending_local; |
159 | bool rotation_pending_relay; | |
d68c9a04 JD |
160 | /* Current state of a rotation. */ |
161 | enum lttng_rotation_state rotation_state; | |
db66e574 JD |
162 | struct { |
163 | /* | |
164 | * When the rotation is in progress, the temporary path name is | |
165 | * stored here. When the rotation is complete, the final path name | |
166 | * is here and can be queried with the rotate_pending call. | |
167 | */ | |
168 | char current_rotate_path[LTTNG_PATH_MAX]; | |
169 | /* | |
170 | * The path where the consumer is currently writing after the first | |
171 | * session rotation. | |
172 | */ | |
173 | char active_tracing_path[LTTNG_PATH_MAX]; | |
174 | } rotation_chunk; | |
175 | /* | |
176 | * The timestamp of the beginning of the previous chunk. For the | |
177 | * first chunk, this is the "lttng start" timestamp. For the | |
178 | * subsequent ones, this copies the current_chunk_start_ts value when | |
179 | * a new rotation starts. This value is used to set the name of a | |
180 | * complete chunk directory, ex: "last_chunk_start_ts-now()". | |
181 | */ | |
182 | time_t last_chunk_start_ts; | |
183 | /* | |
184 | * This is the timestamp when a new chunk starts. When a new rotation | |
185 | * starts, we copy this value to last_chunk_start_ts and replace it | |
186 | * with the current timestamp. | |
187 | */ | |
188 | time_t current_chunk_start_ts; | |
d88744a4 | 189 | /* |
92816cc3 JG |
190 | * Timer to check periodically if a relay and/or consumer has completed |
191 | * the last rotation. | |
d88744a4 | 192 | */ |
92816cc3 JG |
193 | bool rotation_pending_check_timer_enabled; |
194 | timer_t rotation_pending_check_timer; | |
259c2674 | 195 | /* Timer to periodically rotate a session. */ |
92816cc3 JG |
196 | bool rotation_schedule_timer_enabled; |
197 | timer_t rotation_schedule_timer; | |
66ea93b1 | 198 | /* Value for periodic rotations, 0 if disabled. */ |
259c2674 | 199 | uint64_t rotate_timer_period; |
66ea93b1 | 200 | /* Value for size-based rotations, 0 if disabled. */ |
259c2674 | 201 | uint64_t rotate_size; |
5c408ad8 JD |
202 | /* |
203 | * Keep a state if this session was rotated after the last stop command. | |
204 | * We only allow one rotation after a stop. At destroy, we also need to | |
a9577b76 | 205 | * know if a rotation occurred since the last stop to rename the current |
5c408ad8 JD |
206 | * chunk. |
207 | */ | |
208 | bool rotated_after_last_stop; | |
90936dcf JD |
209 | /* |
210 | * Condition and trigger for size-based rotations. | |
211 | */ | |
212 | struct lttng_condition *rotate_condition; | |
213 | struct lttng_trigger *rotate_trigger; | |
5b74c7b1 DG |
214 | }; |
215 | ||
216 | /* Prototypes */ | |
dec56f6c | 217 | int session_create(char *name, uid_t uid, gid_t gid); |
6c9cc2ab | 218 | |
54d01ffb DG |
219 | void session_lock(struct ltt_session *session); |
220 | void session_lock_list(void); | |
71e0a100 | 221 | int session_trylock_list(void); |
54d01ffb DG |
222 | void session_unlock(struct ltt_session *session); |
223 | void session_unlock_list(void); | |
6c9cc2ab | 224 | |
e32d7f27 JG |
225 | void session_destroy(struct ltt_session *session); |
226 | ||
227 | bool session_get(struct ltt_session *session); | |
228 | void session_put(struct ltt_session *session); | |
229 | ||
dd73d57b JG |
230 | enum consumer_dst_type session_get_consumer_destination_type( |
231 | const struct ltt_session *session); | |
232 | const char *session_get_net_consumer_hostname( | |
233 | const struct ltt_session *session); | |
234 | void session_get_net_consumer_ports( | |
235 | const struct ltt_session *session, | |
236 | uint16_t *control_port, uint16_t *data_port); | |
5d65beab JG |
237 | struct lttng_trace_archive_location *session_get_trace_archive_location( |
238 | struct ltt_session *session); | |
dd73d57b | 239 | |
58a1a227 | 240 | struct ltt_session *session_find_by_name(const char *name); |
23324029 | 241 | struct ltt_session *session_find_by_id(uint64_t id); |
99d688f2 | 242 | |
54d01ffb | 243 | struct ltt_session_list *session_get_list(void); |
99d688f2 | 244 | void session_list_wait_empty(void); |
5b74c7b1 | 245 | |
2f77fc4b DG |
246 | int session_access_ok(struct ltt_session *session, uid_t uid, gid_t gid); |
247 | ||
2961f09e JG |
248 | int session_reset_rotation_state(struct ltt_session *session, |
249 | enum lttng_rotation_state result); | |
250 | ||
5b74c7b1 | 251 | #endif /* _LTT_SESSION_H */ |