Network streaming support
[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
26 #include "consumer.h"
27
28 /* Kernel event list */
29 struct ltt_kernel_event_list {
30 struct cds_list_head head;
31 };
32
33 /* Channel stream list */
34 struct ltt_kernel_stream_list {
35 struct cds_list_head head;
36 };
37
38 /* Channel list */
39 struct ltt_kernel_channel_list {
40 struct cds_list_head head;
41 };
42
43 /* Kernel event */
44 struct ltt_kernel_event {
45 int fd;
46 int enabled;
47 /*
48 * TODO: need internal representation to support more than a
49 * single context.
50 */
51 struct lttng_kernel_context *ctx;
52 struct lttng_kernel_event *event;
53 struct cds_list_head list;
54 };
55
56 /* Kernel channel */
57 struct ltt_kernel_channel {
58 int fd;
59 int enabled;
60 unsigned int stream_count;
61 unsigned int event_count;
62 /*
63 * TODO: need internal representation to support more than a
64 * single context.
65 */
66 struct lttng_kernel_context *ctx;
67 struct lttng_channel *channel;
68 struct ltt_kernel_event_list events_list;
69 struct ltt_kernel_stream_list stream_list;
70 struct cds_list_head list;
71 };
72
73 /* Metadata */
74 struct ltt_kernel_metadata {
75 int fd;
76 struct lttng_channel *conf;
77 };
78
79 /* Channel stream */
80 struct ltt_kernel_stream {
81 int fd;
82 int state;
83 /* Format is %s_%d respectively channel name and CPU number. */
84 char name[LTTNG_SYMBOL_NAME_LEN];
85 struct cds_list_head list;
86 };
87
88 /* Kernel session */
89 struct ltt_kernel_session {
90 int fd;
91 int metadata_stream_fd;
92 int consumer_fds_sent;
93 int consumer_fd;
94 unsigned int channel_count;
95 unsigned int stream_count_global;
96 char *trace_path;
97 struct ltt_kernel_metadata *metadata;
98 struct ltt_kernel_channel_list channel_list;
99 /* UID/GID of the user owning the session */
100 uid_t uid;
101 gid_t gid;
102 /*
103 * Two consumer_output object are needed where one is needed for the
104 * current output object and the second one is the temporary object used to
105 * store URI being set by the lttng_set_consumer_uri call. Once
106 * lttng_enable_consumer is called, the two pointers are swapped.
107 */
108 struct consumer_output *consumer;
109 struct consumer_output *tmp_consumer;
110 };
111
112 /*
113 * Lookup functions. NULL is returned if not found.
114 */
115 struct ltt_kernel_event *trace_kernel_get_event_by_name(
116 char *name, struct ltt_kernel_channel *channel);
117 struct ltt_kernel_channel *trace_kernel_get_channel_by_name(
118 char *name, struct ltt_kernel_session *session);
119
120 /*
121 * Create functions malloc() the data structure.
122 */
123 struct ltt_kernel_session *trace_kernel_create_session(char *path);
124 struct ltt_kernel_channel *trace_kernel_create_channel(struct lttng_channel *chan, char *path);
125 struct ltt_kernel_event *trace_kernel_create_event(struct lttng_event *ev);
126 struct ltt_kernel_metadata *trace_kernel_create_metadata(char *path);
127 struct ltt_kernel_stream *trace_kernel_create_stream(const char *name,
128 unsigned int count);
129
130 /*
131 * Destroy functions free() the data structure and remove from linked list if
132 * it's applies.
133 */
134 void trace_kernel_destroy_session(struct ltt_kernel_session *session);
135 void trace_kernel_destroy_metadata(struct ltt_kernel_metadata *metadata);
136 void trace_kernel_destroy_channel(struct ltt_kernel_channel *channel);
137 void trace_kernel_destroy_event(struct ltt_kernel_event *event);
138 void trace_kernel_destroy_stream(struct ltt_kernel_stream *stream);
139
140 #endif /* _LTT_TRACE_KERNEL_H */
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