f2f8c7e3654bfe3be456d1e32e3a711bf48c3d7d
[lttng-tools.git] / src / bin / lttng-sessiond / trace-ust.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_TRACE_UST_H
19 #define _LTT_TRACE_UST_H
20
21 #include <config.h>
22 #include <limits.h>
23 #include <urcu/list.h>
24
25 #include <lttng/lttng.h>
26 #include <common/hashtable/hashtable.h>
27 #include <common/defaults.h>
28
29 #include "consumer.h"
30 #include "jul.h"
31 #include "ust-ctl.h"
32
33 struct ltt_ust_ht_key {
34 const char *name;
35 const struct lttng_filter_bytecode *filter;
36 enum lttng_ust_loglevel_type loglevel;
37 const struct lttng_event_exclusion *exclusion;
38 };
39
40 /* Context hash table nodes */
41 struct ltt_ust_context {
42 struct lttng_ust_context ctx;
43 struct lttng_ht_node_ulong node;
44 struct cds_list_head list;
45 };
46
47 /* UST event */
48 struct ltt_ust_event {
49 unsigned int enabled;
50 struct lttng_ust_event attr;
51 struct lttng_ht_node_str node;
52 struct lttng_ust_filter_bytecode *filter;
53 const struct lttng_event_exclusion *exclusion;
54 };
55
56 /* UST channel */
57 struct ltt_ust_channel {
58 uint64_t id; /* unique id per session. */
59 unsigned int enabled;
60 char name[LTTNG_UST_SYM_NAME_LEN];
61 struct lttng_ust_channel_attr attr;
62 struct lttng_ht *ctx;
63 struct cds_list_head ctx_list;
64 struct lttng_ht *events;
65 struct lttng_ht_node_str node;
66 uint64_t tracefile_size;
67 uint64_t tracefile_count;
68 };
69
70 /* UST domain global (LTTNG_DOMAIN_UST) */
71 struct ltt_ust_domain_global {
72 struct lttng_ht *channels;
73 struct cds_list_head registry_buffer_uid_list;
74 };
75
76 /* UST session */
77 struct ltt_ust_session {
78 uint64_t id; /* Unique identifier of session */
79 int start_trace;
80 struct ltt_ust_domain_global domain_global;
81 struct jul_domain domain_jul;
82 /* UID/GID of the user owning the session */
83 uid_t uid;
84 gid_t gid;
85 /*
86 * Two consumer_output object are needed where one is for the current
87 * output object and the second one is the temporary object used to store
88 * URI being set by the lttng_set_consumer_uri call. Once
89 * lttng_enable_consumer is called, the two pointers are swapped.
90 */
91 struct consumer_output *consumer;
92 struct consumer_output *tmp_consumer;
93 /* Sequence number for filters so the tracer knows the ordering. */
94 uint64_t filter_seq_num;
95 /* This indicates which type of buffer this session is set for. */
96 enum lttng_buffer_type buffer_type;
97 /* If set to 1, the buffer_type can not be changed anymore. */
98 int buffer_type_changed;
99 /* For per UID buffer, every buffer reg object is kept of this session */
100 struct cds_list_head buffer_reg_uid_list;
101 /* Next channel ID available for a newly registered channel. */
102 uint64_t next_channel_id;
103 /* Once this value reaches UINT32_MAX, no more id can be allocated. */
104 uint64_t used_channel_id;
105 /* Tell or not if the session has to output the traces. */
106 unsigned int output_traces;
107 unsigned int snapshot_mode;
108 unsigned int has_non_default_channel;
109 unsigned int live_timer_interval; /* usec */
110 };
111
112 /*
113 * Validate that the id has reached the maximum allowed or not.
114 *
115 * Return 0 if NOT else 1.
116 */
117 static inline int trace_ust_is_max_id(uint64_t id)
118 {
119 return (id == UINT64_MAX) ? 1 : 0;
120 }
121
122 /*
123 * Return next available channel id and increment the used counter. The
124 * trace_ust_is_max_id function MUST be called before in order to validate if
125 * the maximum number of IDs have been reached. If not, it is safe to call this
126 * function.
127 *
128 * Return a unique channel ID. If max is reached, the used_channel_id counter
129 * is returned.
130 */
131 static inline uint64_t trace_ust_get_next_chan_id(struct ltt_ust_session *s)
132 {
133 if (trace_ust_is_max_id(s->used_channel_id)) {
134 return s->used_channel_id;
135 }
136
137 s->used_channel_id++;
138 return s->next_channel_id++;
139 }
140
141 #ifdef HAVE_LIBLTTNG_UST_CTL
142
143 int trace_ust_ht_match_event(struct cds_lfht_node *node, const void *_key);
144 int trace_ust_ht_match_event_by_name(struct cds_lfht_node *node,
145 const void *_key);
146
147 /*
148 * Lookup functions. NULL is returned if not found.
149 */
150 struct ltt_ust_event *trace_ust_find_event(struct lttng_ht *ht,
151 char *name, struct lttng_filter_bytecode *filter, int loglevel,
152 struct lttng_event_exclusion *exclusion);
153 struct ltt_ust_channel *trace_ust_find_channel_by_name(struct lttng_ht *ht,
154 char *name);
155
156 /*
157 * Create functions malloc() the data structure.
158 */
159 struct ltt_ust_session *trace_ust_create_session(uint64_t session_id);
160 struct ltt_ust_channel *trace_ust_create_channel(struct lttng_channel *attr);
161 struct ltt_ust_event *trace_ust_create_event(struct lttng_event *ev,
162 struct lttng_filter_bytecode *filter,
163 struct lttng_event_exclusion *exclusion);
164 struct ltt_ust_context *trace_ust_create_context(
165 struct lttng_event_context *ctx);
166 void trace_ust_delete_channel(struct lttng_ht *ht,
167 struct ltt_ust_channel *channel);
168
169 /*
170 * Destroy functions free() the data structure and remove from linked list if
171 * it's applies.
172 */
173 void trace_ust_destroy_session(struct ltt_ust_session *session);
174 void trace_ust_destroy_channel(struct ltt_ust_channel *channel);
175 void trace_ust_destroy_event(struct ltt_ust_event *event);
176
177 #else /* HAVE_LIBLTTNG_UST_CTL */
178
179 static inline int trace_ust_ht_match_event(struct cds_lfht_node *node,
180 const void *_key)
181 {
182 return 0;
183 }
184 static inline int trace_ust_ht_match_event_by_name(struct cds_lfht_node *node,
185 const void *_key)
186 {
187 return 0;
188 }
189 static inline
190 struct ltt_ust_channel *trace_ust_find_channel_by_name(struct lttng_ht *ht,
191 char *name)
192 {
193 return NULL;
194 }
195
196 static inline
197 struct ltt_ust_session *trace_ust_create_session(unsigned int session_id)
198 {
199 return NULL;
200 }
201 static inline
202 struct ltt_ust_channel *trace_ust_create_channel(struct lttng_channel *attr)
203 {
204 return NULL;
205 }
206 static inline
207 struct ltt_ust_event *trace_ust_create_event(struct lttng_event *ev,
208 struct lttng_filter_bytecode *filter,
209 struct lttng_event_exclusion *exclusion)
210 {
211 return NULL;
212 }
213 static inline
214 void trace_ust_destroy_session(struct ltt_ust_session *session)
215 {
216 }
217
218 static inline
219 void trace_ust_destroy_channel(struct ltt_ust_channel *channel)
220 {
221 }
222
223 static inline
224 void trace_ust_destroy_event(struct ltt_ust_event *event)
225 {
226 }
227 static inline
228 struct ltt_ust_context *trace_ust_create_context(
229 struct lttng_event_context *ctx)
230 {
231 return NULL;
232 }
233 static inline struct ltt_ust_event *trace_ust_find_event(struct lttng_ht *ht,
234 char *name, struct lttng_filter_bytecode *filter, int loglevel,
235 struct lttng_event_exclusion *exclusion)
236 {
237 return NULL;
238 }
239 static inline
240 void trace_ust_delete_channel(struct lttng_ht *ht,
241 struct ltt_ust_channel *channel)
242 {
243 return;
244 }
245
246 #endif /* HAVE_LIBLTTNG_UST_CTL */
247
248 #endif /* _LTT_TRACE_UST_H */
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