Fix: Hide readwrite symbols in common lib
[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;
d0ae4ea8 54 enum lttng_event_type type;
f34daff7 55 struct lttng_kernel_event *event;
20fe2104 56 struct cds_list_head list;
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57 char *filter_expression;
58 struct lttng_filter_bytecode *filter;
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59};
60
61/* Kernel channel */
62struct ltt_kernel_channel {
63 int fd;
d36b8583 64 int enabled;
8c0faa1d 65 unsigned int stream_count;
cbbbb275 66 unsigned int event_count;
645328ae 67 struct cds_list_head ctx_list;
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 /* Session pointer which has a reference to this object. */
73 struct ltt_kernel_session *session;
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74};
75
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76/* Metadata */
77struct ltt_kernel_metadata {
78 int fd;
f3ed775e 79 struct lttng_channel *conf;
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80};
81
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82/* Channel stream */
83struct ltt_kernel_stream {
84 int fd;
8c0faa1d 85 int state;
ffe60014 86 int cpu;
00e2e675 87 /* Format is %s_%d respectively channel name and CPU number. */
ce2a9e76 88 char name[DEFAULT_STREAM_NAME_LEN];
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89 uint64_t tracefile_size;
90 uint64_t tracefile_count;
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91 struct cds_list_head list;
92};
93
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94/* Kernel session */
95struct ltt_kernel_session {
96 int fd;
8c0faa1d 97 int metadata_stream_fd;
3bd1e081 98 int consumer_fds_sent;
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99 unsigned int channel_count;
100 unsigned int stream_count_global;
aaf26714 101 struct ltt_kernel_metadata *metadata;
8c0faa1d 102 struct ltt_kernel_channel_list channel_list;
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103 /* UID/GID of the user owning the session */
104 uid_t uid;
105 gid_t gid;
00e2e675 106 struct consumer_output *consumer;
53632229 107 /* Tracing session id */
d022620a 108 uint64_t id;
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109 /* Session is active or not meaning it has been started or stopped. */
110 unsigned int active:1;
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111 /* Tell or not if the session has to output the traces. */
112 unsigned int output_traces;
27babd3a 113 unsigned int snapshot_mode;
85076754 114 unsigned int has_non_default_channel;
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115};
116
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117/*
118 * Lookup functions. NULL is returned if not found.
119 */
120struct ltt_kernel_event *trace_kernel_get_event_by_name(
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121 char *name, struct ltt_kernel_channel *channel,
122 enum lttng_event_type type);
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123struct ltt_kernel_event *trace_kernel_find_event(
124 char *name, struct ltt_kernel_channel *channel,
125 enum lttng_event_type type,
126 struct lttng_filter_bytecode *filter);
62499ad6 127struct ltt_kernel_channel *trace_kernel_get_channel_by_name(
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128 char *name, struct ltt_kernel_session *session);
129
54012638 130/*
c363b55d 131 * Create functions malloc() the data structure.
54012638 132 */
dec56f6c 133struct ltt_kernel_session *trace_kernel_create_session(void);
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134struct ltt_kernel_channel *trace_kernel_create_channel(
135 struct lttng_channel *chan);
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136struct ltt_kernel_event *trace_kernel_create_event(struct lttng_event *ev,
137 char *filter_expression, struct lttng_filter_bytecode *filter);
a4b92340 138struct ltt_kernel_metadata *trace_kernel_create_metadata(void);
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139struct ltt_kernel_stream *trace_kernel_create_stream(const char *name,
140 unsigned int count);
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141struct ltt_kernel_context *trace_kernel_create_context(
142 struct lttng_kernel_context *ctx);
54012638 143
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144/*
145 * Destroy functions free() the data structure and remove from linked list if
146 * it's applies.
147 */
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148void trace_kernel_destroy_session(struct ltt_kernel_session *session);
149void trace_kernel_destroy_metadata(struct ltt_kernel_metadata *metadata);
150void trace_kernel_destroy_channel(struct ltt_kernel_channel *channel);
151void trace_kernel_destroy_event(struct ltt_kernel_event *event);
152void trace_kernel_destroy_stream(struct ltt_kernel_stream *stream);
645328ae 153void trace_kernel_destroy_context(struct ltt_kernel_context *ctx);
c363b55d 154
62499ad6 155#endif /* _LTT_TRACE_KERNEL_H */
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