2 * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
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.
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.
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.
18 #ifndef _LTT_TRACE_UST_H
19 #define _LTT_TRACE_UST_H
23 #include <urcu/list.h>
25 #include <lttng/lttng.h>
26 #include <common/hashtable/hashtable.h>
27 #include <common/defaults.h>
33 struct ltt_ust_ht_key
{
35 const struct lttng_filter_bytecode
*filter
;
36 enum lttng_ust_loglevel_type loglevel
;
37 const struct lttng_event_exclusion
*exclusion
;
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
;
48 struct ltt_ust_event
{
50 struct lttng_ust_event attr
;
51 struct lttng_ht_node_str node
;
52 char *filter_expression
;
53 struct lttng_ust_filter_bytecode
*filter
;
54 struct lttng_event_exclusion
*exclusion
;
58 struct ltt_ust_channel
{
59 uint64_t id
; /* unique id per session. */
61 char name
[LTTNG_UST_SYM_NAME_LEN
];
62 struct lttng_ust_channel_attr attr
;
64 struct cds_list_head ctx_list
;
65 struct lttng_ht
*events
;
66 struct lttng_ht_node_str node
;
67 uint64_t tracefile_size
;
68 uint64_t tracefile_count
;
71 /* UST domain global (LTTNG_DOMAIN_UST) */
72 struct ltt_ust_domain_global
{
73 struct lttng_ht
*channels
;
74 struct cds_list_head registry_buffer_uid_list
;
78 struct ltt_ust_session
{
79 uint64_t id
; /* Unique identifier of session */
81 struct ltt_ust_domain_global domain_global
;
82 struct jul_domain domain_jul
;
83 /* UID/GID of the user owning the session */
87 * Two consumer_output object are needed where one is for the current
88 * output object and the second one is the temporary object used to store
89 * URI being set by the lttng_set_consumer_uri call. Once
90 * lttng_enable_consumer is called, the two pointers are swapped.
92 struct consumer_output
*consumer
;
93 struct consumer_output
*tmp_consumer
;
94 /* Sequence number for filters so the tracer knows the ordering. */
95 uint64_t filter_seq_num
;
96 /* This indicates which type of buffer this session is set for. */
97 enum lttng_buffer_type buffer_type
;
98 /* If set to 1, the buffer_type can not be changed anymore. */
99 int buffer_type_changed
;
100 /* For per UID buffer, every buffer reg object is kept of this session */
101 struct cds_list_head buffer_reg_uid_list
;
102 /* Next channel ID available for a newly registered channel. */
103 uint64_t next_channel_id
;
104 /* Once this value reaches UINT32_MAX, no more id can be allocated. */
105 uint64_t used_channel_id
;
106 /* Tell or not if the session has to output the traces. */
107 unsigned int output_traces
;
108 unsigned int snapshot_mode
;
109 unsigned int has_non_default_channel
;
110 unsigned int live_timer_interval
; /* usec */
112 /* Metadata channel attributes. */
113 struct lttng_ust_channel_attr metadata_attr
;
117 * Validate that the id has reached the maximum allowed or not.
119 * Return 0 if NOT else 1.
121 static inline int trace_ust_is_max_id(uint64_t id
)
123 return (id
== UINT64_MAX
) ? 1 : 0;
127 * Return next available channel id and increment the used counter. The
128 * trace_ust_is_max_id function MUST be called before in order to validate if
129 * the maximum number of IDs have been reached. If not, it is safe to call this
132 * Return a unique channel ID. If max is reached, the used_channel_id counter
135 static inline uint64_t trace_ust_get_next_chan_id(struct ltt_ust_session
*s
)
137 if (trace_ust_is_max_id(s
->used_channel_id
)) {
138 return s
->used_channel_id
;
141 s
->used_channel_id
++;
142 return s
->next_channel_id
++;
145 #ifdef HAVE_LIBLTTNG_UST_CTL
147 int trace_ust_ht_match_event(struct cds_lfht_node
*node
, const void *_key
);
148 int trace_ust_ht_match_event_by_name(struct cds_lfht_node
*node
,
152 * Lookup functions. NULL is returned if not found.
154 struct ltt_ust_event
*trace_ust_find_event(struct lttng_ht
*ht
,
155 char *name
, struct lttng_filter_bytecode
*filter
, int loglevel
,
156 struct lttng_event_exclusion
*exclusion
);
157 struct ltt_ust_channel
*trace_ust_find_channel_by_name(struct lttng_ht
*ht
,
161 * Create functions malloc() the data structure.
163 struct ltt_ust_session
*trace_ust_create_session(uint64_t session_id
);
164 struct ltt_ust_channel
*trace_ust_create_channel(struct lttng_channel
*attr
);
165 struct ltt_ust_event
*trace_ust_create_event(struct lttng_event
*ev
,
166 char *filter_expression
,
167 struct lttng_filter_bytecode
*filter
,
168 struct lttng_event_exclusion
*exclusion
);
169 struct ltt_ust_context
*trace_ust_create_context(
170 struct lttng_event_context
*ctx
);
171 void trace_ust_delete_channel(struct lttng_ht
*ht
,
172 struct ltt_ust_channel
*channel
);
175 * Destroy functions free() the data structure and remove from linked list if
178 void trace_ust_destroy_session(struct ltt_ust_session
*session
);
179 void trace_ust_destroy_channel(struct ltt_ust_channel
*channel
);
180 void trace_ust_destroy_event(struct ltt_ust_event
*event
);
182 #else /* HAVE_LIBLTTNG_UST_CTL */
184 static inline int trace_ust_ht_match_event(struct cds_lfht_node
*node
,
189 static inline int trace_ust_ht_match_event_by_name(struct cds_lfht_node
*node
,
195 struct ltt_ust_channel
*trace_ust_find_channel_by_name(struct lttng_ht
*ht
,
202 struct ltt_ust_session
*trace_ust_create_session(unsigned int session_id
)
207 struct ltt_ust_channel
*trace_ust_create_channel(struct lttng_channel
*attr
)
212 struct ltt_ust_event
*trace_ust_create_event(struct lttng_event
*ev
,
213 const char *filter_expression
,
214 struct lttng_filter_bytecode
*filter
,
215 struct lttng_event_exclusion
*exclusion
)
220 void trace_ust_destroy_session(struct ltt_ust_session
*session
)
225 void trace_ust_destroy_channel(struct ltt_ust_channel
*channel
)
230 void trace_ust_destroy_event(struct ltt_ust_event
*event
)
234 struct ltt_ust_context
*trace_ust_create_context(
235 struct lttng_event_context
*ctx
)
239 static inline struct ltt_ust_event
*trace_ust_find_event(struct lttng_ht
*ht
,
240 char *name
, struct lttng_filter_bytecode
*filter
, int loglevel
,
241 struct lttng_event_exclusion
*exclusion
)
246 void trace_ust_delete_channel(struct lttng_ht
*ht
,
247 struct ltt_ust_channel
*channel
)
252 #endif /* HAVE_LIBLTTNG_UST_CTL */
254 #endif /* _LTT_TRACE_UST_H */