Fix: build failure using disable-lttng-ust configure option
[lttng-tools.git] / src / bin / lttng-sessiond / trace-kernel.h
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1/*
2 * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
3 *
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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.
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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 *
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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.
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16 */
17
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18#ifndef _LTT_TRACE_KERNEL_H
19#define _LTT_TRACE_KERNEL_H
fda89c9b 20
9e78d6ae 21#include <urcu/list.h>
d4a2a84a 22
f3ed775e 23#include <lttng/lttng.h>
10a8a223 24#include <common/lttng-kernel.h>
4dbc372b 25#include <common/lttng-kernel-old.h>
ce2a9e76 26#include <common/defaults.h>
54012638 27
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28#include "consumer.h"
29
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30/* Kernel event list */
31struct ltt_kernel_event_list {
32 struct cds_list_head head;
33};
34
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35/* Channel stream list */
36struct ltt_kernel_stream_list {
37 struct cds_list_head head;
38};
39
40/* Channel list */
41struct ltt_kernel_channel_list {
42 struct cds_list_head head;
43};
44
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45struct ltt_kernel_context {
46 struct lttng_kernel_context ctx;
47 struct cds_list_head list;
48};
49
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50/* Kernel event */
51struct ltt_kernel_event {
20fe2104 52 int fd;
e953ef25 53 int enabled;
f34daff7 54 struct lttng_kernel_event *event;
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55 struct cds_list_head list;
56};
57
58/* Kernel channel */
59struct ltt_kernel_channel {
60 int fd;
d36b8583 61 int enabled;
8c0faa1d 62 unsigned int stream_count;
cbbbb275 63 unsigned int event_count;
645328ae 64 struct cds_list_head ctx_list;
f3ed775e 65 struct lttng_channel *channel;
20fe2104 66 struct ltt_kernel_event_list events_list;
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67 struct ltt_kernel_stream_list stream_list;
68 struct cds_list_head list;
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69 /* Session pointer which has a reference to this object. */
70 struct ltt_kernel_session *session;
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71};
72
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73/* Metadata */
74struct ltt_kernel_metadata {
75 int fd;
f3ed775e 76 struct lttng_channel *conf;
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77};
78
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79/* Channel stream */
80struct ltt_kernel_stream {
81 int fd;
8c0faa1d 82 int state;
ffe60014 83 int cpu;
00e2e675 84 /* Format is %s_%d respectively channel name and CPU number. */
ce2a9e76 85 char name[DEFAULT_STREAM_NAME_LEN];
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86 uint64_t tracefile_size;
87 uint64_t tracefile_count;
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88 struct cds_list_head list;
89};
90
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91/* Kernel session */
92struct ltt_kernel_session {
93 int fd;
8c0faa1d 94 int metadata_stream_fd;
3bd1e081 95 int consumer_fds_sent;
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96 unsigned int channel_count;
97 unsigned int stream_count_global;
aaf26714 98 struct ltt_kernel_metadata *metadata;
8c0faa1d 99 struct ltt_kernel_channel_list channel_list;
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100 /* UID/GID of the user owning the session */
101 uid_t uid;
102 gid_t gid;
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103 /*
104 * Two consumer_output object are needed where one is needed for the
105 * current output object and the second one is the temporary object used to
106 * store URI being set by the lttng_set_consumer_uri call. Once
107 * lttng_enable_consumer is called, the two pointers are swapped.
108 */
109 struct consumer_output *consumer;
110 struct consumer_output *tmp_consumer;
53632229 111 /* Tracing session id */
d022620a 112 uint64_t id;
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113 /* Session is active or not meaning it has been started or stopped. */
114 unsigned int active:1;
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115 /* Tell or not if the session has to output the traces. */
116 unsigned int output_traces;
27babd3a 117 unsigned int snapshot_mode;
85076754 118 unsigned int has_non_default_channel;
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119};
120
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121/*
122 * Lookup functions. NULL is returned if not found.
123 */
124struct ltt_kernel_event *trace_kernel_get_event_by_name(
19e70852 125 char *name, struct ltt_kernel_channel *channel);
62499ad6 126struct ltt_kernel_channel *trace_kernel_get_channel_by_name(
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127 char *name, struct ltt_kernel_session *session);
128
54012638 129/*
c363b55d 130 * Create functions malloc() the data structure.
54012638 131 */
dec56f6c 132struct ltt_kernel_session *trace_kernel_create_session(void);
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133struct ltt_kernel_channel *trace_kernel_create_channel(
134 struct lttng_channel *chan);
62499ad6 135struct ltt_kernel_event *trace_kernel_create_event(struct lttng_event *ev);
a4b92340 136struct ltt_kernel_metadata *trace_kernel_create_metadata(void);
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137struct ltt_kernel_stream *trace_kernel_create_stream(const char *name,
138 unsigned int count);
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139struct ltt_kernel_context *trace_kernel_create_context(
140 struct lttng_kernel_context *ctx);
54012638 141
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142/*
143 * Destroy functions free() the data structure and remove from linked list if
144 * it's applies.
145 */
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146void trace_kernel_destroy_session(struct ltt_kernel_session *session);
147void trace_kernel_destroy_metadata(struct ltt_kernel_metadata *metadata);
148void trace_kernel_destroy_channel(struct ltt_kernel_channel *channel);
149void trace_kernel_destroy_event(struct ltt_kernel_event *event);
150void trace_kernel_destroy_stream(struct ltt_kernel_stream *stream);
645328ae 151void trace_kernel_destroy_context(struct ltt_kernel_context *ctx);
c363b55d 152
62499ad6 153#endif /* _LTT_TRACE_KERNEL_H */
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