Rename ust app function for better semantic
[lttng-tools.git] / lttng-sessiond / trace-kernel.h
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1/*
2 * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
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6 * as published by the Free Software Foundation; only version 2
7 * of the License.
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8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
17 */
18
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19#ifndef _LTT_TRACE_KERNEL_H
20#define _LTT_TRACE_KERNEL_H
fda89c9b 21
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22#include <limits.h>
23#include <urcu/list.h>
d4a2a84a 24
f3ed775e 25#include <lttng/lttng.h>
1e307fab 26#include <lttng-kernel.h>
54012638 27
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28/* Kernel event list */
29struct ltt_kernel_event_list {
30 struct cds_list_head head;
31};
32
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33/* Channel stream list */
34struct ltt_kernel_stream_list {
35 struct cds_list_head head;
36};
37
38/* Channel list */
39struct ltt_kernel_channel_list {
40 struct cds_list_head head;
41};
42
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43/* Kernel event */
44struct ltt_kernel_event {
20fe2104 45 int fd;
e953ef25 46 int enabled;
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47 /*
48 * TODO: need internal representation to support more than a
49 * single context.
50 */
d65106b1 51 struct lttng_kernel_context *ctx;
f34daff7 52 struct lttng_kernel_event *event;
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53 struct cds_list_head list;
54};
55
56/* Kernel channel */
57struct ltt_kernel_channel {
58 int fd;
d36b8583 59 int enabled;
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60 char *pathname;
61 unsigned int stream_count;
cbbbb275 62 unsigned int event_count;
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63 /*
64 * TODO: need internal representation to support more than a
65 * single context.
66 */
d65106b1 67 struct lttng_kernel_context *ctx;
f3ed775e 68 struct lttng_channel *channel;
20fe2104 69 struct ltt_kernel_event_list events_list;
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70 struct ltt_kernel_stream_list stream_list;
71 struct cds_list_head list;
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72};
73
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74/* Metadata */
75struct ltt_kernel_metadata {
76 int fd;
8c0faa1d 77 char *pathname;
f3ed775e 78 struct lttng_channel *conf;
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79};
80
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81/* Channel stream */
82struct ltt_kernel_stream {
83 int fd;
84 char *pathname;
85 int state;
86 struct cds_list_head list;
87};
88
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89/* Kernel session */
90struct ltt_kernel_session {
91 int fd;
8c0faa1d 92 int metadata_stream_fd;
3bd1e081 93 int consumer_fds_sent;
d9800920 94 int consumer_fd;
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95 unsigned int channel_count;
96 unsigned int stream_count_global;
63053e7c 97 char *trace_path;
aaf26714 98 struct ltt_kernel_metadata *metadata;
8c0faa1d 99 struct ltt_kernel_channel_list channel_list;
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100};
101
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102/*
103 * Lookup functions. NULL is returned if not found.
104 */
105struct ltt_kernel_event *trace_kernel_get_event_by_name(
19e70852 106 char *name, struct ltt_kernel_channel *channel);
62499ad6 107struct ltt_kernel_channel *trace_kernel_get_channel_by_name(
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108 char *name, struct ltt_kernel_session *session);
109
54012638 110/*
c363b55d 111 * Create functions malloc() the data structure.
54012638 112 */
f9815039 113struct ltt_kernel_session *trace_kernel_create_session(char *path);
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114struct ltt_kernel_channel *trace_kernel_create_channel(struct lttng_channel *chan, char *path);
115struct ltt_kernel_event *trace_kernel_create_event(struct lttng_event *ev);
116struct ltt_kernel_metadata *trace_kernel_create_metadata(char *path);
117struct ltt_kernel_stream *trace_kernel_create_stream(void);
54012638 118
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119/*
120 * Destroy functions free() the data structure and remove from linked list if
121 * it's applies.
122 */
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123void trace_kernel_destroy_session(struct ltt_kernel_session *session);
124void trace_kernel_destroy_metadata(struct ltt_kernel_metadata *metadata);
125void trace_kernel_destroy_channel(struct ltt_kernel_channel *channel);
126void trace_kernel_destroy_event(struct ltt_kernel_event *event);
127void trace_kernel_destroy_stream(struct ltt_kernel_stream *stream);
c363b55d 128
62499ad6 129#endif /* _LTT_TRACE_KERNEL_H */
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