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_KERNEL_H
19 #define _LTT_TRACE_KERNEL_H
21 #include <urcu/list.h>
23 #include <lttng/lttng.h>
24 #include <common/lttng-kernel.h>
25 #include <common/lttng-kernel-old.h>
26 #include <common/defaults.h>
30 /* Kernel event list */
31 struct ltt_kernel_event_list
{
32 struct cds_list_head head
;
35 /* Channel stream list */
36 struct ltt_kernel_stream_list
{
37 struct cds_list_head head
;
41 struct ltt_kernel_channel_list
{
42 struct cds_list_head head
;
45 struct ltt_kernel_context
{
46 struct lttng_kernel_context ctx
;
47 struct cds_list_head list
;
51 struct ltt_kernel_event
{
54 enum lttng_event_type type
;
55 struct lttng_kernel_event
*event
;
56 struct cds_list_head list
;
60 struct ltt_kernel_channel
{
63 unsigned int stream_count
;
64 unsigned int event_count
;
65 struct cds_list_head ctx_list
;
66 struct lttng_channel
*channel
;
67 struct ltt_kernel_event_list events_list
;
68 struct ltt_kernel_stream_list stream_list
;
69 struct cds_list_head list
;
70 /* Session pointer which has a reference to this object. */
71 struct ltt_kernel_session
*session
;
75 struct ltt_kernel_metadata
{
77 struct lttng_channel
*conf
;
81 struct ltt_kernel_stream
{
85 /* Format is %s_%d respectively channel name and CPU number. */
86 char name
[DEFAULT_STREAM_NAME_LEN
];
87 uint64_t tracefile_size
;
88 uint64_t tracefile_count
;
89 struct cds_list_head list
;
93 struct ltt_kernel_session
{
95 int metadata_stream_fd
;
96 int consumer_fds_sent
;
97 unsigned int channel_count
;
98 unsigned int stream_count_global
;
99 struct ltt_kernel_metadata
*metadata
;
100 struct ltt_kernel_channel_list channel_list
;
101 /* UID/GID of the user owning the session */
105 * Two consumer_output object are needed where one is needed for the
106 * current output object and the second one is the temporary object used to
107 * store URI being set by the lttng_set_consumer_uri call. Once
108 * lttng_enable_consumer is called, the two pointers are swapped.
110 struct consumer_output
*consumer
;
111 struct consumer_output
*tmp_consumer
;
112 /* Tracing session id */
114 /* Session is active or not meaning it has been started or stopped. */
115 unsigned int active
:1;
116 /* Tell or not if the session has to output the traces. */
117 unsigned int output_traces
;
118 unsigned int snapshot_mode
;
119 unsigned int has_non_default_channel
;
123 * Lookup functions. NULL is returned if not found.
125 struct ltt_kernel_event
*trace_kernel_get_event_by_name(
126 char *name
, struct ltt_kernel_channel
*channel
,
127 enum lttng_event_type type
);
128 struct ltt_kernel_channel
*trace_kernel_get_channel_by_name(
129 char *name
, struct ltt_kernel_session
*session
);
132 * Create functions malloc() the data structure.
134 struct ltt_kernel_session
*trace_kernel_create_session(void);
135 struct ltt_kernel_channel
*trace_kernel_create_channel(
136 struct lttng_channel
*chan
);
137 struct ltt_kernel_event
*trace_kernel_create_event(struct lttng_event
*ev
);
138 struct ltt_kernel_metadata
*trace_kernel_create_metadata(void);
139 struct ltt_kernel_stream
*trace_kernel_create_stream(const char *name
,
141 struct ltt_kernel_context
*trace_kernel_create_context(
142 struct lttng_kernel_context
*ctx
);
145 * Destroy functions free() the data structure and remove from linked list if
148 void trace_kernel_destroy_session(struct ltt_kernel_session
*session
);
149 void trace_kernel_destroy_metadata(struct ltt_kernel_metadata
*metadata
);
150 void trace_kernel_destroy_channel(struct ltt_kernel_channel
*channel
);
151 void trace_kernel_destroy_event(struct ltt_kernel_event
*event
);
152 void trace_kernel_destroy_stream(struct ltt_kernel_stream
*stream
);
153 void trace_kernel_destroy_context(struct ltt_kernel_context
*ctx
);
155 #endif /* _LTT_TRACE_KERNEL_H */