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; | |
6c9cc2ab | 50 | |
b5541356 | 51 | /* |
a24f7994 MD |
52 | * Session unique ID generator. The session list lock MUST be |
53 | * upon update and read of this counter. | |
b5541356 | 54 | */ |
d022620a | 55 | uint64_t next_uuid; |
6c9cc2ab DG |
56 | |
57 | /* Linked list head */ | |
5b74c7b1 DG |
58 | struct cds_list_head head; |
59 | }; | |
60 | ||
b5541356 DG |
61 | /* |
62 | * This data structure contains information needed to identify a tracing | |
63 | * session for both LTTng and UST. | |
5b74c7b1 DG |
64 | */ |
65 | struct ltt_session { | |
74babd95 | 66 | char name[NAME_MAX]; |
73184835 | 67 | char hostname[HOST_NAME_MAX]; /* Local hostname. */ |
20fe2104 | 68 | struct ltt_kernel_session *kernel_session; |
f6a9efaa | 69 | struct ltt_ust_session *ust_session; |
b5541356 DG |
70 | /* |
71 | * Protect any read/write on this session data structure. This lock must be | |
72 | * acquired *before* using any public functions declared below. Use | |
54d01ffb | 73 | * session_lock() and session_unlock() for that. |
b5541356 DG |
74 | */ |
75 | pthread_mutex_t lock; | |
76 | struct cds_list_head list; | |
d022620a | 77 | uint64_t id; /* session unique identifier */ |
6df2e2c9 MD |
78 | /* UID/GID of the user owning the session */ |
79 | uid_t uid; | |
80 | gid_t gid; | |
00e2e675 DG |
81 | /* |
82 | * Network session handle. A value of 0 means that there is no remote | |
83 | * session established. | |
84 | */ | |
85 | uint64_t net_handle; | |
86 | /* | |
87 | * This consumer is only set when the create_session_uri call is made. | |
88 | * This contains the temporary information for a consumer output. Upon | |
89 | * creation of the UST or kernel session, this consumer, if available, is | |
90 | * copied into those sessions. | |
91 | */ | |
92 | struct consumer_output *consumer; | |
a4b92340 | 93 | |
8382cf6f DG |
94 | /* Did at least ONE start command has been triggered?. */ |
95 | unsigned int has_been_started:1; | |
96 | /* | |
97 | * Is the session active? Start trace command sets this to 1 and the stop | |
98 | * command reset it to 0. | |
99 | */ | |
100 | unsigned int active:1; | |
6dc3064a DG |
101 | |
102 | /* Snapshot representation in a session. */ | |
103 | struct snapshot snapshot; | |
104 | /* Indicate if the session has to output the traces or not. */ | |
105 | unsigned int output_traces; | |
27babd3a DG |
106 | /* |
107 | * This session is in snapshot mode. This means that every channel enabled | |
108 | * will be set in overwrite mode and mmap. It is considered exclusively for | |
109 | * snapshot purposes. | |
110 | */ | |
111 | unsigned int snapshot_mode; | |
ecc48a90 JD |
112 | /* |
113 | * Timer set when the session is created for live reading. | |
114 | */ | |
d98ad589 | 115 | unsigned int live_timer; |
d7ba1388 MD |
116 | /* |
117 | * Path where to keep the shared memory files. | |
118 | */ | |
119 | char shm_path[PATH_MAX]; | |
23324029 JD |
120 | /* |
121 | * Node in ltt_sessions_ht_by_id. | |
122 | */ | |
123 | struct lttng_ht_node_u64 node; | |
ad9f5c17 JG |
124 | /* |
125 | * The current archive id corresponds to the number of session rotations | |
126 | * that have occured for this session. The archive id | |
127 | * is used to tag the "generation" of a stream. This tag allows the | |
128 | * consumer and relay daemons to track when a given stream was created | |
129 | * during the lifetime of a session. | |
130 | * | |
131 | * For instance, if a stream is created after a session rotation was | |
132 | * launched, the consumer and relay daemons must not check its position | |
133 | * to determine if that specific session rotation was completed. It is | |
134 | * implicitly "completed" since the stream appeared _after_ the session | |
135 | * rotation was initiated. | |
136 | */ | |
137 | uint64_t current_archive_id; | |
db66e574 JD |
138 | /* |
139 | * Rotation is pending between the time it starts until the consumer has | |
140 | * finished extracting the data. If the session uses a relay, data related | |
141 | * to a rotation can still be in flight after that, see | |
142 | * rotate_pending_relay. | |
143 | */ | |
144 | bool rotate_pending; | |
5c408ad8 JD |
145 | /* |
146 | * True until the relay has finished the rotation of all the streams. | |
147 | */ | |
148 | bool rotate_pending_relay; | |
d68c9a04 JD |
149 | /* Current state of a rotation. */ |
150 | enum lttng_rotation_state rotation_state; | |
db66e574 JD |
151 | /* |
152 | * Number of channels waiting for a rotation. | |
153 | * When this number reaches 0, we can handle the rename of the chunk | |
154 | * folder and inform the client that the rotate is finished. | |
155 | */ | |
156 | unsigned int nr_chan_rotate_pending; | |
157 | struct { | |
158 | /* | |
159 | * When the rotation is in progress, the temporary path name is | |
160 | * stored here. When the rotation is complete, the final path name | |
161 | * is here and can be queried with the rotate_pending call. | |
162 | */ | |
163 | char current_rotate_path[LTTNG_PATH_MAX]; | |
164 | /* | |
165 | * The path where the consumer is currently writing after the first | |
166 | * session rotation. | |
167 | */ | |
168 | char active_tracing_path[LTTNG_PATH_MAX]; | |
169 | } rotation_chunk; | |
170 | /* | |
171 | * The timestamp of the beginning of the previous chunk. For the | |
172 | * first chunk, this is the "lttng start" timestamp. For the | |
173 | * subsequent ones, this copies the current_chunk_start_ts value when | |
174 | * a new rotation starts. This value is used to set the name of a | |
175 | * complete chunk directory, ex: "last_chunk_start_ts-now()". | |
176 | */ | |
177 | time_t last_chunk_start_ts; | |
178 | /* | |
179 | * This is the timestamp when a new chunk starts. When a new rotation | |
180 | * starts, we copy this value to last_chunk_start_ts and replace it | |
181 | * with the current timestamp. | |
182 | */ | |
183 | time_t current_chunk_start_ts; | |
d88744a4 JD |
184 | /* |
185 | * Timer to check periodically if a relay has completed the last | |
186 | * rotation. | |
187 | */ | |
188 | bool rotate_relay_pending_timer_enabled; | |
189 | timer_t rotate_relay_pending_timer; | |
259c2674 JD |
190 | /* Timer to periodically rotate a session. */ |
191 | bool rotate_timer_enabled; | |
192 | timer_t rotate_timer; | |
66ea93b1 | 193 | /* Value for periodic rotations, 0 if disabled. */ |
259c2674 | 194 | uint64_t rotate_timer_period; |
66ea93b1 | 195 | /* Value for size-based rotations, 0 if disabled. */ |
259c2674 | 196 | uint64_t rotate_size; |
5c408ad8 JD |
197 | /* |
198 | * Keep a state if this session was rotated after the last stop command. | |
199 | * We only allow one rotation after a stop. At destroy, we also need to | |
200 | * know if a rotation occured since the last stop to rename the current | |
201 | * chunk. | |
202 | */ | |
203 | bool rotated_after_last_stop; | |
90936dcf JD |
204 | /* |
205 | * Condition and trigger for size-based rotations. | |
206 | */ | |
207 | struct lttng_condition *rotate_condition; | |
208 | struct lttng_trigger *rotate_trigger; | |
5b74c7b1 DG |
209 | }; |
210 | ||
211 | /* Prototypes */ | |
dec56f6c | 212 | int session_create(char *name, uid_t uid, gid_t gid); |
271933a4 | 213 | int session_destroy(struct ltt_session *session); |
6c9cc2ab | 214 | |
54d01ffb DG |
215 | void session_lock(struct ltt_session *session); |
216 | void session_lock_list(void); | |
71e0a100 | 217 | int session_trylock_list(void); |
54d01ffb DG |
218 | void session_unlock(struct ltt_session *session); |
219 | void session_unlock_list(void); | |
6c9cc2ab | 220 | |
dd73d57b JG |
221 | enum consumer_dst_type session_get_consumer_destination_type( |
222 | const struct ltt_session *session); | |
223 | const char *session_get_net_consumer_hostname( | |
224 | const struct ltt_session *session); | |
225 | void session_get_net_consumer_ports( | |
226 | const struct ltt_session *session, | |
227 | uint16_t *control_port, uint16_t *data_port); | |
5d65beab JG |
228 | struct lttng_trace_archive_location *session_get_trace_archive_location( |
229 | struct ltt_session *session); | |
dd73d57b | 230 | |
58a1a227 | 231 | struct ltt_session *session_find_by_name(const char *name); |
23324029 | 232 | struct ltt_session *session_find_by_id(uint64_t id); |
54d01ffb | 233 | struct ltt_session_list *session_get_list(void); |
5b74c7b1 | 234 | |
2f77fc4b DG |
235 | int session_access_ok(struct ltt_session *session, uid_t uid, gid_t gid); |
236 | ||
5b74c7b1 | 237 | #endif /* _LTT_SESSION_H */ |