Cleanup: ust_session_id unused by buffer_reg_uid_consumer_channel_key
[lttng-tools.git] / src / bin / lttng-sessiond / trace-kernel.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_KERNEL_H
19 #define _LTT_TRACE_KERNEL_H
20
21 #include <urcu/list.h>
22
23 #include <lttng/lttng.h>
24 #include <common/lttng-kernel.h>
25 #include <common/lttng-kernel-old.h>
26 #include <common/defaults.h>
27
28 #include "consumer.h"
29
30 /* Kernel event list */
31 struct ltt_kernel_event_list {
32 struct cds_list_head head;
33 };
34
35 /* Channel stream list */
36 struct ltt_kernel_stream_list {
37 struct cds_list_head head;
38 };
39
40 /* Channel list */
41 struct ltt_kernel_channel_list {
42 struct cds_list_head head;
43 };
44
45 struct ltt_kernel_context {
46 struct lttng_kernel_context ctx;
47 struct cds_list_head list;
48 /* Indicates whether or not the context is in a list. */
49 bool in_list;
50 };
51
52 /* Kernel event */
53 struct ltt_kernel_event {
54 int fd;
55 int enabled;
56 enum lttng_event_type type;
57 struct lttng_kernel_event *event;
58 struct cds_list_head list;
59 char *filter_expression;
60 struct lttng_filter_bytecode *filter;
61 };
62
63 /* Kernel channel */
64 struct ltt_kernel_channel {
65 int fd;
66 uint64_t key; /* Key to reference this channel with the consumer. */
67 int enabled;
68 unsigned int stream_count;
69 unsigned int event_count;
70 bool published_to_notification_thread;
71 struct cds_list_head ctx_list;
72 struct lttng_channel *channel;
73 struct ltt_kernel_event_list events_list;
74 struct ltt_kernel_stream_list stream_list;
75 struct cds_list_head list;
76 /* Session pointer which has a reference to this object. */
77 struct ltt_kernel_session *session;
78 bool sent_to_consumer;
79 };
80
81 /* Metadata */
82 struct ltt_kernel_metadata {
83 int fd;
84 uint64_t key; /* Key to reference this channel with the consumer. */
85 struct lttng_channel *conf;
86 };
87
88 /* Channel stream */
89 struct ltt_kernel_stream {
90 int fd;
91 int state;
92 int cpu;
93 bool sent_to_consumer;
94 /* Format is %s_%d respectively channel name and CPU number. */
95 char name[DEFAULT_STREAM_NAME_LEN];
96 uint64_t tracefile_size;
97 uint64_t tracefile_count;
98 struct cds_list_head list;
99 };
100
101 /* Kernel session */
102 struct ltt_kernel_session {
103 int fd;
104 int metadata_stream_fd;
105 int consumer_fds_sent;
106 unsigned int channel_count;
107 unsigned int stream_count_global;
108 struct ltt_kernel_metadata *metadata;
109 struct ltt_kernel_channel_list channel_list;
110 /* UID/GID of the user owning the session */
111 uid_t uid;
112 gid_t gid;
113 struct consumer_output *consumer;
114 /* Tracing session id */
115 uint64_t id;
116 /* Session is active or not meaning it has been started or stopped. */
117 unsigned int active:1;
118 /* Tell or not if the session has to output the traces. */
119 unsigned int output_traces;
120 unsigned int snapshot_mode;
121 unsigned int has_non_default_channel;
122 };
123
124 /*
125 * Lookup functions. NULL is returned if not found.
126 */
127 struct ltt_kernel_event *trace_kernel_get_event_by_name(
128 char *name, struct ltt_kernel_channel *channel,
129 enum lttng_event_type type);
130 struct ltt_kernel_event *trace_kernel_find_event(
131 char *name, struct ltt_kernel_channel *channel,
132 enum lttng_event_type type,
133 struct lttng_filter_bytecode *filter);
134 struct ltt_kernel_channel *trace_kernel_get_channel_by_name(
135 char *name, struct ltt_kernel_session *session);
136
137 /*
138 * Create functions malloc() the data structure.
139 */
140 struct ltt_kernel_session *trace_kernel_create_session(void);
141 struct ltt_kernel_channel *trace_kernel_create_channel(
142 struct lttng_channel *chan);
143 struct ltt_kernel_event *trace_kernel_create_event(struct lttng_event *ev,
144 char *filter_expression, struct lttng_filter_bytecode *filter);
145 struct ltt_kernel_metadata *trace_kernel_create_metadata(void);
146 struct ltt_kernel_stream *trace_kernel_create_stream(const char *name,
147 unsigned int count);
148 struct ltt_kernel_context *trace_kernel_create_context(
149 struct lttng_kernel_context *ctx);
150 struct ltt_kernel_context *trace_kernel_copy_context(
151 struct ltt_kernel_context *ctx);
152
153 /*
154 * Destroy functions free() the data structure and remove from linked list if
155 * it's applies.
156 */
157 void trace_kernel_destroy_session(struct ltt_kernel_session *session);
158 void trace_kernel_destroy_metadata(struct ltt_kernel_metadata *metadata);
159 void trace_kernel_destroy_channel(struct ltt_kernel_channel *channel);
160 void trace_kernel_destroy_event(struct ltt_kernel_event *event);
161 void trace_kernel_destroy_stream(struct ltt_kernel_stream *stream);
162 void trace_kernel_destroy_context(struct ltt_kernel_context *ctx);
163
164 #endif /* _LTT_TRACE_KERNEL_H */
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