Fix: resource leak in enable-event command
[lttng-tools.git] / src / bin / lttng-sessiond / buffer-registry.h
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1/*
2 * Copyright (C) 2013 - David Goulet <dgoulet@efficios.com>
3 *
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms of the GNU General Public License, version 2 only, as
6 * published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope that it will be useful, but WITHOUT
9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
11 * more details.
12 *
13 * You should have received a copy of the GNU General Public License along with
14 * this program; if not, write to the Free Software Foundation, Inc., 51
15 * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
16 */
17
18#ifndef LTTNG_BUFFER_REGISTRY_H
19#define LTTNG_BUFFER_REGISTRY_H
20
21#include <stdint.h>
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22#include <urcu/list.h>
23
24#include <lttng/lttng.h>
25#include <common/hashtable/hashtable.h>
26
27#include "consumer.h"
534b3ed8 28#include "ust-ctl.h"
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29#include "ust-registry.h"
30
31struct buffer_reg_stream {
32 struct cds_list_head lnode;
33 union {
34 /* Original object data that MUST be copied over. */
35 struct lttng_ust_object_data *ust;
36 } obj;
37};
38
39struct buffer_reg_channel {
40 /* This key is the same as a tracing channel key. */
41 uint32_t key;
42 /* Key of the channel on the consumer side. */
43 uint64_t consumer_key;
44 /* Stream registry object of this channel registry. */
45 struct cds_list_head streams;
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46 /* Total number of stream in the list. */
47 uint64_t stream_count;
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48 /* Used to ensure mutual exclusion to the stream's list. */
49 pthread_mutex_t stream_list_lock;
50 /* Node for hash table usage. */
51 struct lttng_ht_node_u64 node;
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52 /* Size of subbuffers in this channel. */
53 size_t subbuf_size;
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54 union {
55 /* Original object data that MUST be copied over. */
56 struct lttng_ust_object_data *ust;
57 } obj;
58};
59
60struct buffer_reg_session {
61 /* Registry per domain. */
62 union {
63 struct ust_registry_session *ust;
64 } reg;
65
66 /* Contains buffer registry channel indexed by tracing channel key. */
67 struct lttng_ht *channels;
68};
69
70/*
71 * Registry object for per UID buffers.
72 */
73struct buffer_reg_uid {
74 /*
75 * Keys to match this object in a hash table. The following three variables
76 * identify a unique per UID buffer registry.
77 */
d9bf3ca4 78 uint64_t session_id; /* Unique tracing session id. */
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79 int bits_per_long; /* ABI */
80 uid_t uid; /* Owner. */
81
82 enum lttng_domain_type domain;
83 struct buffer_reg_session *registry;
84
85 /* Indexed by session id. */
86 struct lttng_ht_node_u64 node;
87 /* Node of a linked list used to teardown object at a destroy session. */
88 struct cds_list_head lnode;
89};
90
91/*
92 * Registry object for per PID buffers.
93 */
94struct buffer_reg_pid {
d9bf3ca4 95 uint64_t session_id;
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96
97 struct buffer_reg_session *registry;
98
99 /* Indexed by session id. */
d9bf3ca4 100 struct lttng_ht_node_u64 node;
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101};
102
103/* Buffer registry per UID. */
104void buffer_reg_init_uid_registry(void);
d9bf3ca4 105int buffer_reg_uid_create(uint64_t session_id, uint32_t bits_per_long, uid_t uid,
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106 enum lttng_domain_type domain, struct buffer_reg_uid **regp);
107void buffer_reg_uid_add(struct buffer_reg_uid *reg);
d9bf3ca4 108struct buffer_reg_uid *buffer_reg_uid_find(uint64_t session_id,
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109 uint32_t bits_per_long, uid_t uid);
110void buffer_reg_uid_remove(struct buffer_reg_uid *regp);
111void buffer_reg_uid_destroy(struct buffer_reg_uid *regp,
112 struct consumer_output *consumer);
113
114/* Buffer registry per PID. */
115void buffer_reg_init_pid_registry(void);
d9bf3ca4 116int buffer_reg_pid_create(uint64_t session_id, struct buffer_reg_pid **regp);
7972aab2 117void buffer_reg_pid_add(struct buffer_reg_pid *reg);
d9bf3ca4 118struct buffer_reg_pid *buffer_reg_pid_find(uint64_t session_id);
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119void buffer_reg_pid_remove(struct buffer_reg_pid *regp);
120void buffer_reg_pid_destroy(struct buffer_reg_pid *regp);
121
122/* Channel */
123int buffer_reg_channel_create(uint64_t key, struct buffer_reg_channel **regp);
124void buffer_reg_channel_add(struct buffer_reg_session *session,
125 struct buffer_reg_channel *channel);
126struct buffer_reg_channel *buffer_reg_channel_find(uint64_t key,
127 struct buffer_reg_uid *reg);
128void buffer_reg_channel_remove(struct buffer_reg_session *session,
129 struct buffer_reg_channel *regp);
130void buffer_reg_channel_destroy(struct buffer_reg_channel *regp,
131 enum lttng_domain_type domain);
132
133/* Stream */
134int buffer_reg_stream_create(struct buffer_reg_stream **regp);
135void buffer_reg_stream_add(struct buffer_reg_stream *stream,
136 struct buffer_reg_channel *channel);
137void buffer_reg_stream_destroy(struct buffer_reg_stream *regp,
138 enum lttng_domain_type domain);
139
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140/* Global registry. */
141void buffer_reg_destroy_registries(void);
142
143#endif /* LTTNG_BUFFER_REGISTRY_H */
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