Sessiond rotation thread
[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;
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48 /* Indicates whether or not the context is in a list. */
49 bool in_list;
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50};
51
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52/* Kernel event */
53struct ltt_kernel_event {
20fe2104 54 int fd;
e953ef25 55 int enabled;
d0ae4ea8 56 enum lttng_event_type type;
f34daff7 57 struct lttng_kernel_event *event;
20fe2104 58 struct cds_list_head list;
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59 char *filter_expression;
60 struct lttng_filter_bytecode *filter;
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61};
62
63/* Kernel channel */
64struct ltt_kernel_channel {
65 int fd;
e1f3997a 66 uint64_t key; /* Key to reference this channel with the consumer. */
d36b8583 67 int enabled;
8c0faa1d 68 unsigned int stream_count;
cbbbb275 69 unsigned int event_count;
753873bf 70 bool published_to_notification_thread;
645328ae 71 struct cds_list_head ctx_list;
f3ed775e 72 struct lttng_channel *channel;
20fe2104 73 struct ltt_kernel_event_list events_list;
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74 struct ltt_kernel_stream_list stream_list;
75 struct cds_list_head list;
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76 /* Session pointer which has a reference to this object. */
77 struct ltt_kernel_session *session;
e99f9447 78 bool sent_to_consumer;
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79};
80
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81/* Metadata */
82struct ltt_kernel_metadata {
83 int fd;
d40f0359 84 uint64_t key; /* Key to reference this channel with the consumer. */
f3ed775e 85 struct lttng_channel *conf;
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86};
87
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88/* Channel stream */
89struct ltt_kernel_stream {
90 int fd;
8c0faa1d 91 int state;
ffe60014 92 int cpu;
6986ab9b 93 bool sent_to_consumer;
00e2e675 94 /* Format is %s_%d respectively channel name and CPU number. */
ce2a9e76 95 char name[DEFAULT_STREAM_NAME_LEN];
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96 uint64_t tracefile_size;
97 uint64_t tracefile_count;
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98 struct cds_list_head list;
99};
100
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101/* Kernel session */
102struct ltt_kernel_session {
103 int fd;
8c0faa1d 104 int metadata_stream_fd;
3bd1e081 105 int consumer_fds_sent;
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106 unsigned int channel_count;
107 unsigned int stream_count_global;
aaf26714 108 struct ltt_kernel_metadata *metadata;
8c0faa1d 109 struct ltt_kernel_channel_list channel_list;
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110 /* UID/GID of the user owning the session */
111 uid_t uid;
112 gid_t gid;
00e2e675 113 struct consumer_output *consumer;
53632229 114 /* Tracing session id */
d022620a 115 uint64_t id;
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116 /* Session is active or not meaning it has been started or stopped. */
117 unsigned int active:1;
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118 /* Tell or not if the session has to output the traces. */
119 unsigned int output_traces;
27babd3a 120 unsigned int snapshot_mode;
85076754 121 unsigned int has_non_default_channel;
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122};
123
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124/*
125 * Lookup functions. NULL is returned if not found.
126 */
127struct ltt_kernel_event *trace_kernel_get_event_by_name(
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128 char *name, struct ltt_kernel_channel *channel,
129 enum lttng_event_type type);
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130struct ltt_kernel_event *trace_kernel_find_event(
131 char *name, struct ltt_kernel_channel *channel,
132 enum lttng_event_type type,
133 struct lttng_filter_bytecode *filter);
62499ad6 134struct ltt_kernel_channel *trace_kernel_get_channel_by_name(
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135 char *name, struct ltt_kernel_session *session);
136
54012638 137/*
c363b55d 138 * Create functions malloc() the data structure.
54012638 139 */
dec56f6c 140struct ltt_kernel_session *trace_kernel_create_session(void);
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141struct ltt_kernel_channel *trace_kernel_create_channel(
142 struct lttng_channel *chan);
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143struct ltt_kernel_event *trace_kernel_create_event(struct lttng_event *ev,
144 char *filter_expression, struct lttng_filter_bytecode *filter);
a4b92340 145struct ltt_kernel_metadata *trace_kernel_create_metadata(void);
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146struct ltt_kernel_stream *trace_kernel_create_stream(const char *name,
147 unsigned int count);
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148struct ltt_kernel_context *trace_kernel_create_context(
149 struct lttng_kernel_context *ctx);
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150struct ltt_kernel_context *trace_kernel_copy_context(
151 struct ltt_kernel_context *ctx);
54012638 152
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153/*
154 * Destroy functions free() the data structure and remove from linked list if
155 * it's applies.
156 */
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157void trace_kernel_destroy_session(struct ltt_kernel_session *session);
158void trace_kernel_destroy_metadata(struct ltt_kernel_metadata *metadata);
159void trace_kernel_destroy_channel(struct ltt_kernel_channel *channel);
160void trace_kernel_destroy_event(struct ltt_kernel_event *event);
161void trace_kernel_destroy_stream(struct ltt_kernel_stream *stream);
645328ae 162void trace_kernel_destroy_context(struct ltt_kernel_context *ctx);
c363b55d 163
62499ad6 164#endif /* _LTT_TRACE_KERNEL_H */
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