Clean-up: sessiond: make some accesses to conditions const
[lttng-tools.git] / src / bin / lttng-sessiond / trace-kernel.h
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fda89c9b 1/*
ab5be9fa 2 * Copyright (C) 2011 David Goulet <david.goulet@polymtl.ca>
fda89c9b 3 *
ab5be9fa 4 * SPDX-License-Identifier: GPL-2.0-only
fda89c9b 5 *
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6 */
7
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8#ifndef _LTT_TRACE_KERNEL_H
9#define _LTT_TRACE_KERNEL_H
fda89c9b 10
9e78d6ae 11#include <urcu/list.h>
d4a2a84a 12
f3ed775e 13#include <lttng/lttng.h>
10a8a223 14#include <common/lttng-kernel.h>
4dbc372b 15#include <common/lttng-kernel-old.h>
ce2a9e76 16#include <common/defaults.h>
54012638 17
00e2e675 18#include "consumer.h"
55c9e7ca 19#include "tracker.h"
00e2e675 20
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21/* Kernel event list */
22struct ltt_kernel_event_list {
23 struct cds_list_head head;
24};
25
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26/* Channel stream list */
27struct ltt_kernel_stream_list {
28 struct cds_list_head head;
29};
30
31/* Channel list */
32struct ltt_kernel_channel_list {
33 struct cds_list_head head;
34};
35
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36struct ltt_kernel_context {
37 struct lttng_kernel_context ctx;
38 struct cds_list_head list;
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39 /* Indicates whether or not the context is in a list. */
40 bool in_list;
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41};
42
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43/* Kernel event */
44struct ltt_kernel_event {
20fe2104 45 int fd;
e953ef25 46 int enabled;
d0ae4ea8 47 enum lttng_event_type type;
f34daff7 48 struct lttng_kernel_event *event;
20fe2104 49 struct cds_list_head list;
00a62084 50 char *filter_expression;
2b00d462 51 struct lttng_bytecode *filter;
3c02e545 52 struct lttng_userspace_probe_location *userspace_probe_location;
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53};
54
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55/* Kernel event */
56struct ltt_kernel_event_notifier_rule {
57 int fd;
58 int enabled;
59 enum lttng_event_type type;
60 struct lttng_trigger *trigger;
61 uint64_t token;
2b00d462 62 const struct lttng_bytecode *filter;
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63 struct lttng_userspace_probe_location *userspace_probe_location;
64 struct cds_lfht_node ht_node;
65 /* call_rcu delayed reclaim. */
66 struct rcu_head rcu_node;
67};
68
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69/* Kernel channel */
70struct ltt_kernel_channel {
71 int fd;
e1f3997a 72 uint64_t key; /* Key to reference this channel with the consumer. */
d36b8583 73 int enabled;
8c0faa1d 74 unsigned int stream_count;
cbbbb275 75 unsigned int event_count;
753873bf 76 bool published_to_notification_thread;
645328ae 77 struct cds_list_head ctx_list;
f3ed775e 78 struct lttng_channel *channel;
20fe2104 79 struct ltt_kernel_event_list events_list;
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80 struct ltt_kernel_stream_list stream_list;
81 struct cds_list_head list;
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82 /* Session pointer which has a reference to this object. */
83 struct ltt_kernel_session *session;
e99f9447 84 bool sent_to_consumer;
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85};
86
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87/* Metadata */
88struct ltt_kernel_metadata {
89 int fd;
d40f0359 90 uint64_t key; /* Key to reference this channel with the consumer. */
f3ed775e 91 struct lttng_channel *conf;
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92};
93
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94/* Channel stream */
95struct ltt_kernel_stream {
96 int fd;
8c0faa1d 97 int state;
ffe60014 98 int cpu;
6986ab9b 99 bool sent_to_consumer;
00e2e675 100 /* Format is %s_%d respectively channel name and CPU number. */
ce2a9e76 101 char name[DEFAULT_STREAM_NAME_LEN];
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102 uint64_t tracefile_size;
103 uint64_t tracefile_count;
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104 struct cds_list_head list;
105};
106
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107/* Kernel session */
108struct ltt_kernel_session {
109 int fd;
8c0faa1d 110 int metadata_stream_fd;
3bd1e081 111 int consumer_fds_sent;
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112 unsigned int channel_count;
113 unsigned int stream_count_global;
aaf26714 114 struct ltt_kernel_metadata *metadata;
8c0faa1d 115 struct ltt_kernel_channel_list channel_list;
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116 /* UID/GID of the user owning the session */
117 uid_t uid;
118 gid_t gid;
00e2e675 119 struct consumer_output *consumer;
53632229 120 /* Tracing session id */
d022620a 121 uint64_t id;
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122 /* Session is active or not meaning it has been started or stopped. */
123 unsigned int active:1;
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124 /* Tell or not if the session has to output the traces. */
125 unsigned int output_traces;
27babd3a 126 unsigned int snapshot_mode;
85076754 127 unsigned int has_non_default_channel;
a2814ea7 128 bool is_live_session;
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129 /* Current trace chunk of the ltt_session. */
130 struct lttng_trace_chunk *current_trace_chunk;
55c9e7ca 131 /* Tracker lists */
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132 struct process_attr_tracker *tracker_pid;
133 struct process_attr_tracker *tracker_vpid;
134 struct process_attr_tracker *tracker_uid;
135 struct process_attr_tracker *tracker_vuid;
136 struct process_attr_tracker *tracker_gid;
137 struct process_attr_tracker *tracker_vgid;
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138};
139
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140/*
141 * Lookup functions. NULL is returned if not found.
142 */
143struct ltt_kernel_event *trace_kernel_get_event_by_name(
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144 char *name, struct ltt_kernel_channel *channel,
145 enum lttng_event_type type);
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146struct ltt_kernel_event *trace_kernel_find_event(
147 char *name, struct ltt_kernel_channel *channel,
148 enum lttng_event_type type,
2b00d462 149 struct lttng_bytecode *filter);
62499ad6 150struct ltt_kernel_channel *trace_kernel_get_channel_by_name(
df4f5a87 151 const char *name, struct ltt_kernel_session *session);
19e70852 152
54012638 153/*
c363b55d 154 * Create functions malloc() the data structure.
54012638 155 */
dec56f6c 156struct ltt_kernel_session *trace_kernel_create_session(void);
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157struct ltt_kernel_channel *trace_kernel_create_channel(
158 struct lttng_channel *chan);
71a3bb01 159enum lttng_error_code trace_kernel_create_event(struct lttng_event *ev,
2b00d462 160 char *filter_expression, struct lttng_bytecode *filter,
71a3bb01 161 struct ltt_kernel_event **kernel_event);
a4b92340 162struct ltt_kernel_metadata *trace_kernel_create_metadata(void);
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163struct ltt_kernel_stream *trace_kernel_create_stream(const char *name,
164 unsigned int count);
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165struct ltt_kernel_context *trace_kernel_create_context(
166 struct lttng_kernel_context *ctx);
7c1f6da2 167/* Trigger is only non-const to acquire a reference. */
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168enum lttng_error_code trace_kernel_create_event_notifier_rule(
169 struct lttng_trigger *trigger,
170 uint64_t token,
171 struct ltt_kernel_event_notifier_rule **event_notifier_rule);
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172struct ltt_kernel_context *trace_kernel_copy_context(
173 struct ltt_kernel_context *ctx);
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174enum lttng_error_code trace_kernel_init_event_notifier_from_event_rule(
175 const struct lttng_event_rule *rule,
176 struct lttng_kernel_event_notifier *kernel_event_notifier);
54012638 177
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178/*
179 * Destroy functions free() the data structure and remove from linked list if
180 * it's applies.
181 */
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182void trace_kernel_destroy_session(struct ltt_kernel_session *session);
183void trace_kernel_destroy_metadata(struct ltt_kernel_metadata *metadata);
184void trace_kernel_destroy_channel(struct ltt_kernel_channel *channel);
185void trace_kernel_destroy_event(struct ltt_kernel_event *event);
186void trace_kernel_destroy_stream(struct ltt_kernel_stream *stream);
645328ae 187void trace_kernel_destroy_context(struct ltt_kernel_context *ctx);
352b58f5 188void trace_kernel_destroy_event_notifier_rule(struct ltt_kernel_event_notifier_rule *rule);
d070c424 189void trace_kernel_free_session(struct ltt_kernel_session *session);
c363b55d 190
62499ad6 191#endif /* _LTT_TRACE_KERNEL_H */
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