Fix: ust: segfault on lttng start on filter bytecode copy
[lttng-tools.git] / src / bin / lttng-sessiond / trace-kernel.h
CommitLineData
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
645328ae 36struct ltt_kernel_context {
b8e2fb80 37 struct lttng_kernel_abi_context ctx;
645328ae 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;
b8e2fb80 48 struct lttng_kernel_abi_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;
90aa04a1 58 uint64_t error_counter_index;
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59 int enabled;
60 enum lttng_event_type type;
61 struct lttng_trigger *trigger;
62 uint64_t token;
2b00d462 63 const struct lttng_bytecode *filter;
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64 struct lttng_userspace_probe_location *userspace_probe_location;
65 struct cds_lfht_node ht_node;
66 /* call_rcu delayed reclaim. */
67 struct rcu_head rcu_node;
68};
69
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70/* Kernel channel */
71struct ltt_kernel_channel {
72 int fd;
e1f3997a 73 uint64_t key; /* Key to reference this channel with the consumer. */
d36b8583 74 int enabled;
8c0faa1d 75 unsigned int stream_count;
cbbbb275 76 unsigned int event_count;
753873bf 77 bool published_to_notification_thread;
645328ae 78 struct cds_list_head ctx_list;
f3ed775e 79 struct lttng_channel *channel;
20fe2104 80 struct ltt_kernel_event_list events_list;
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81 struct ltt_kernel_stream_list stream_list;
82 struct cds_list_head list;
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83 /* Session pointer which has a reference to this object. */
84 struct ltt_kernel_session *session;
e99f9447 85 bool sent_to_consumer;
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86};
87
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88/* Metadata */
89struct ltt_kernel_metadata {
90 int fd;
d40f0359 91 uint64_t key; /* Key to reference this channel with the consumer. */
f3ed775e 92 struct lttng_channel *conf;
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93};
94
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95/* Channel stream */
96struct ltt_kernel_stream {
97 int fd;
8c0faa1d 98 int state;
ffe60014 99 int cpu;
6986ab9b 100 bool sent_to_consumer;
00e2e675 101 /* Format is %s_%d respectively channel name and CPU number. */
ce2a9e76 102 char name[DEFAULT_STREAM_NAME_LEN];
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103 uint64_t tracefile_size;
104 uint64_t tracefile_count;
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105 struct cds_list_head list;
106};
107
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108/* Kernel session */
109struct ltt_kernel_session {
110 int fd;
8c0faa1d 111 int metadata_stream_fd;
3bd1e081 112 int consumer_fds_sent;
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113 unsigned int channel_count;
114 unsigned int stream_count_global;
aaf26714 115 struct ltt_kernel_metadata *metadata;
8c0faa1d 116 struct ltt_kernel_channel_list channel_list;
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117 /* UID/GID of the user owning the session */
118 uid_t uid;
119 gid_t gid;
00e2e675 120 struct consumer_output *consumer;
53632229 121 /* Tracing session id */
d022620a 122 uint64_t id;
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123 /* Session is active or not meaning it has been started or stopped. */
124 unsigned int active:1;
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125 /* Tell or not if the session has to output the traces. */
126 unsigned int output_traces;
27babd3a 127 unsigned int snapshot_mode;
85076754 128 unsigned int has_non_default_channel;
a2814ea7 129 bool is_live_session;
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130 /* Current trace chunk of the ltt_session. */
131 struct lttng_trace_chunk *current_trace_chunk;
55c9e7ca 132 /* Tracker lists */
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133 struct process_attr_tracker *tracker_pid;
134 struct process_attr_tracker *tracker_vpid;
135 struct process_attr_tracker *tracker_uid;
136 struct process_attr_tracker *tracker_vuid;
137 struct process_attr_tracker *tracker_gid;
138 struct process_attr_tracker *tracker_vgid;
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139};
140
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141/*
142 * Lookup functions. NULL is returned if not found.
143 */
144struct ltt_kernel_event *trace_kernel_get_event_by_name(
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145 char *name, struct ltt_kernel_channel *channel,
146 enum lttng_event_type type);
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147struct ltt_kernel_event *trace_kernel_find_event(
148 char *name, struct ltt_kernel_channel *channel,
149 enum lttng_event_type type,
2b00d462 150 struct lttng_bytecode *filter);
62499ad6 151struct ltt_kernel_channel *trace_kernel_get_channel_by_name(
df4f5a87 152 const char *name, struct ltt_kernel_session *session);
19e70852 153
54012638 154/*
c363b55d 155 * Create functions malloc() the data structure.
54012638 156 */
dec56f6c 157struct ltt_kernel_session *trace_kernel_create_session(void);
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158struct ltt_kernel_channel *trace_kernel_create_channel(
159 struct lttng_channel *chan);
71a3bb01 160enum lttng_error_code trace_kernel_create_event(struct lttng_event *ev,
2b00d462 161 char *filter_expression, struct lttng_bytecode *filter,
71a3bb01 162 struct ltt_kernel_event **kernel_event);
a4b92340 163struct ltt_kernel_metadata *trace_kernel_create_metadata(void);
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164struct ltt_kernel_stream *trace_kernel_create_stream(const char *name,
165 unsigned int count);
645328ae 166struct ltt_kernel_context *trace_kernel_create_context(
b8e2fb80 167 struct lttng_kernel_abi_context *ctx);
7c1f6da2 168/* Trigger is only non-const to acquire a reference. */
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169enum lttng_error_code trace_kernel_create_event_notifier_rule(
170 struct lttng_trigger *trigger,
171 uint64_t token,
90aa04a1 172 uint64_t error_counter_index,
352b58f5 173 struct ltt_kernel_event_notifier_rule **event_notifier_rule);
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174struct ltt_kernel_context *trace_kernel_copy_context(
175 struct ltt_kernel_context *ctx);
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176enum lttng_error_code trace_kernel_init_event_notifier_from_event_rule(
177 const struct lttng_event_rule *rule,
b8e2fb80 178 struct lttng_kernel_abi_event_notifier *kernel_event_notifier);
54012638 179
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180/*
181 * Destroy functions free() the data structure and remove from linked list if
182 * it's applies.
183 */
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184void trace_kernel_destroy_session(struct ltt_kernel_session *session);
185void trace_kernel_destroy_metadata(struct ltt_kernel_metadata *metadata);
186void trace_kernel_destroy_channel(struct ltt_kernel_channel *channel);
187void trace_kernel_destroy_event(struct ltt_kernel_event *event);
188void trace_kernel_destroy_stream(struct ltt_kernel_stream *stream);
645328ae 189void trace_kernel_destroy_context(struct ltt_kernel_context *ctx);
352b58f5 190void trace_kernel_destroy_event_notifier_rule(struct ltt_kernel_event_notifier_rule *rule);
d070c424 191void trace_kernel_free_session(struct ltt_kernel_session *session);
c363b55d 192
62499ad6 193#endif /* _LTT_TRACE_KERNEL_H */
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