trackers: support tracking feature
[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 #include "tracker.h"
30
31 /* Kernel event list */
32 struct ltt_kernel_event_list {
33 struct cds_list_head head;
34 };
35
36 /* Channel stream list */
37 struct ltt_kernel_stream_list {
38 struct cds_list_head head;
39 };
40
41 /* Channel list */
42 struct ltt_kernel_channel_list {
43 struct cds_list_head head;
44 };
45
46 struct ltt_kernel_context {
47 struct lttng_kernel_context ctx;
48 struct cds_list_head list;
49 /* Indicates whether or not the context is in a list. */
50 bool in_list;
51 };
52
53 /* Kernel event */
54 struct ltt_kernel_event {
55 int fd;
56 int enabled;
57 enum lttng_event_type type;
58 struct lttng_kernel_event *event;
59 struct cds_list_head list;
60 char *filter_expression;
61 struct lttng_filter_bytecode *filter;
62 struct lttng_userspace_probe_location *userspace_probe_location;
63 };
64
65 /* Kernel channel */
66 struct ltt_kernel_channel {
67 int fd;
68 uint64_t key; /* Key to reference this channel with the consumer. */
69 int enabled;
70 unsigned int stream_count;
71 unsigned int event_count;
72 bool published_to_notification_thread;
73 struct cds_list_head ctx_list;
74 struct lttng_channel *channel;
75 struct ltt_kernel_event_list events_list;
76 struct ltt_kernel_stream_list stream_list;
77 struct cds_list_head list;
78 /* Session pointer which has a reference to this object. */
79 struct ltt_kernel_session *session;
80 bool sent_to_consumer;
81 };
82
83 /* Metadata */
84 struct ltt_kernel_metadata {
85 int fd;
86 uint64_t key; /* Key to reference this channel with the consumer. */
87 struct lttng_channel *conf;
88 };
89
90 /* Channel stream */
91 struct ltt_kernel_stream {
92 int fd;
93 int state;
94 int cpu;
95 bool sent_to_consumer;
96 /* Format is %s_%d respectively channel name and CPU number. */
97 char name[DEFAULT_STREAM_NAME_LEN];
98 uint64_t tracefile_size;
99 uint64_t tracefile_count;
100 struct cds_list_head list;
101 };
102
103 /* Kernel session */
104 struct ltt_kernel_session {
105 int fd;
106 int metadata_stream_fd;
107 int consumer_fds_sent;
108 unsigned int channel_count;
109 unsigned int stream_count_global;
110 struct ltt_kernel_metadata *metadata;
111 struct ltt_kernel_channel_list channel_list;
112 /* UID/GID of the user owning the session */
113 uid_t uid;
114 gid_t gid;
115 struct consumer_output *consumer;
116 /* Tracing session id */
117 uint64_t id;
118 /* Session is active or not meaning it has been started or stopped. */
119 unsigned int active:1;
120 /* Tell or not if the session has to output the traces. */
121 unsigned int output_traces;
122 unsigned int snapshot_mode;
123 unsigned int has_non_default_channel;
124 /* Current trace chunk of the ltt_session. */
125 struct lttng_trace_chunk *current_trace_chunk;
126 /* Tracker lists */
127 struct lttng_tracker_list *tracker_list_pid;
128 struct lttng_tracker_list *tracker_list_vpid;
129 struct lttng_tracker_list *tracker_list_uid;
130 struct lttng_tracker_list *tracker_list_vuid;
131 struct lttng_tracker_list *tracker_list_gid;
132 struct lttng_tracker_list *tracker_list_vgid;
133 };
134
135 /*
136 * Lookup functions. NULL is returned if not found.
137 */
138 struct ltt_kernel_event *trace_kernel_get_event_by_name(
139 char *name, struct ltt_kernel_channel *channel,
140 enum lttng_event_type type);
141 struct ltt_kernel_event *trace_kernel_find_event(
142 char *name, struct ltt_kernel_channel *channel,
143 enum lttng_event_type type,
144 struct lttng_filter_bytecode *filter);
145 struct ltt_kernel_channel *trace_kernel_get_channel_by_name(
146 const char *name, struct ltt_kernel_session *session);
147
148 /*
149 * Create functions malloc() the data structure.
150 */
151 struct ltt_kernel_session *trace_kernel_create_session(void);
152 struct ltt_kernel_channel *trace_kernel_create_channel(
153 struct lttng_channel *chan);
154 enum lttng_error_code trace_kernel_create_event(struct lttng_event *ev,
155 char *filter_expression, struct lttng_filter_bytecode *filter,
156 struct ltt_kernel_event **kernel_event);
157 struct ltt_kernel_metadata *trace_kernel_create_metadata(void);
158 struct ltt_kernel_stream *trace_kernel_create_stream(const char *name,
159 unsigned int count);
160 struct ltt_kernel_context *trace_kernel_create_context(
161 struct lttng_kernel_context *ctx);
162 struct ltt_kernel_context *trace_kernel_copy_context(
163 struct ltt_kernel_context *ctx);
164
165 /*
166 * Destroy functions free() the data structure and remove from linked list if
167 * it's applies.
168 */
169 void trace_kernel_destroy_session(struct ltt_kernel_session *session);
170 void trace_kernel_destroy_metadata(struct ltt_kernel_metadata *metadata);
171 void trace_kernel_destroy_channel(struct ltt_kernel_channel *channel);
172 void trace_kernel_destroy_event(struct ltt_kernel_event *event);
173 void trace_kernel_destroy_stream(struct ltt_kernel_stream *stream);
174 void trace_kernel_destroy_context(struct ltt_kernel_context *ctx);
175 void trace_kernel_free_session(struct ltt_kernel_session *session);
176
177 #endif /* _LTT_TRACE_KERNEL_H */
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