5c518135d0144b71aef0369f8f4527e84d92ebb2
[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 };
49
50 /* Kernel event */
51 struct ltt_kernel_event {
52 int fd;
53 int enabled;
54 enum lttng_event_type type;
55 struct lttng_kernel_event *event;
56 struct cds_list_head list;
57 };
58
59 /* Kernel channel */
60 struct ltt_kernel_channel {
61 int fd;
62 int enabled;
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;
72 };
73
74 /* Metadata */
75 struct ltt_kernel_metadata {
76 int fd;
77 struct lttng_channel *conf;
78 };
79
80 /* Channel stream */
81 struct ltt_kernel_stream {
82 int fd;
83 int state;
84 int cpu;
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;
90 };
91
92 /* Kernel session */
93 struct ltt_kernel_session {
94 int fd;
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 */
102 uid_t uid;
103 gid_t gid;
104 /*
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.
109 */
110 struct consumer_output *consumer;
111 struct consumer_output *tmp_consumer;
112 /* Tracing session id */
113 uint64_t 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;
120 };
121
122 /*
123 * Lookup functions. NULL is returned if not found.
124 */
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);
130
131 /*
132 * Create functions malloc() the data structure.
133 */
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,
140 unsigned int count);
141 struct ltt_kernel_context *trace_kernel_create_context(
142 struct lttng_kernel_context *ctx);
143
144 /*
145 * Destroy functions free() the data structure and remove from linked list if
146 * it's applies.
147 */
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);
154
155 #endif /* _LTT_TRACE_KERNEL_H */
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