--- /dev/null
+/*
+ * Copyright (C) 2013 David Goulet <dgoulet@efficios.com>
+ *
+ * SPDX-License-Identifier: GPL-2.0-only
+ *
+ */
+
+#ifndef LTTNG_BUFFER_REGISTRY_H
+#define LTTNG_BUFFER_REGISTRY_H
+
+#include <stdint.h>
+#include <urcu/list.h>
+
+#include <lttng/lttng.h>
+#include <common/hashtable/hashtable.hpp>
+
+#include "consumer.hpp"
+#include "lttng-ust-ctl.hpp"
+#include "ust-registry.hpp"
+
+struct buffer_reg_stream {
+ struct cds_list_head lnode;
+ union {
+ /* Original object data that MUST be copied over. */
+ struct lttng_ust_abi_object_data *ust;
+ } obj;
+};
+
+struct buffer_reg_channel {
+ /* This key is the same as a tracing channel key. */
+ uint32_t key;
+ /* Key of the channel on the consumer side. */
+ uint64_t consumer_key;
+ /* Stream registry object of this channel registry. */
+ struct cds_list_head streams;
+ /* Total number of stream in the list. */
+ uint64_t stream_count;
+ /* Used to ensure mutual exclusion to the stream's list. */
+ pthread_mutex_t stream_list_lock;
+ /* Node for hash table usage. */
+ struct lttng_ht_node_u64 node;
+ /* Size of subbuffers in this channel. */
+ size_t subbuf_size;
+ /* Number of subbuffers per stream. */
+ size_t num_subbuf;
+ union {
+ /* Original object data that MUST be copied over. */
+ struct lttng_ust_abi_object_data *ust;
+ } obj;
+};
+
+struct buffer_reg_session {
+ /* Registry per domain. */
+ union {
+ struct ust_registry_session *ust;
+ } reg;
+
+ /* Contains buffer registry channel indexed by tracing channel key. */
+ struct lttng_ht *channels;
+};
+
+/*
+ * Registry object for per UID buffers.
+ */
+struct buffer_reg_uid {
+ /*
+ * Keys to match this object in a hash table. The following three variables
+ * identify a unique per UID buffer registry.
+ */
+ uint64_t session_id; /* Unique tracing session id. */
+ int bits_per_long; /* ABI */
+ uid_t uid; /* Owner. */
+
+ enum lttng_domain_type domain;
+ struct buffer_reg_session *registry;
+
+ /* Indexed by session id. */
+ struct lttng_ht_node_u64 node;
+ /* Node of a linked list used to teardown object at a destroy session. */
+ struct cds_list_head lnode;
+
+ char root_shm_path[PATH_MAX];
+ char shm_path[PATH_MAX];
+};
+
+/*
+ * Registry object for per PID buffers.
+ */
+struct buffer_reg_pid {
+ uint64_t session_id;
+
+ struct buffer_reg_session *registry;
+
+ /* Indexed by session id. */
+ struct lttng_ht_node_u64 node;
+
+ char root_shm_path[PATH_MAX];
+ char shm_path[PATH_MAX];
+};
+
+/* Buffer registry per UID. */
+void buffer_reg_init_uid_registry(void);
+int buffer_reg_uid_create(uint64_t session_id, uint32_t bits_per_long, uid_t uid,
+ enum lttng_domain_type domain, struct buffer_reg_uid **regp,
+ const char *root_shm_path, const char *shm_path);
+void buffer_reg_uid_add(struct buffer_reg_uid *reg);
+struct buffer_reg_uid *buffer_reg_uid_find(uint64_t session_id,
+ uint32_t bits_per_long, uid_t uid);
+void buffer_reg_uid_remove(struct buffer_reg_uid *regp);
+void buffer_reg_uid_destroy(struct buffer_reg_uid *regp,
+ struct consumer_output *consumer);
+
+/* Buffer registry per PID. */
+void buffer_reg_init_pid_registry(void);
+int buffer_reg_pid_create(uint64_t session_id, struct buffer_reg_pid **regp,
+ const char *root_shm_path, const char *shm_path);
+void buffer_reg_pid_add(struct buffer_reg_pid *reg);
+struct buffer_reg_pid *buffer_reg_pid_find(uint64_t session_id);
+void buffer_reg_pid_remove(struct buffer_reg_pid *regp);
+void buffer_reg_pid_destroy(struct buffer_reg_pid *regp);
+
+/* Channel */
+int buffer_reg_channel_create(uint64_t key, struct buffer_reg_channel **regp);
+void buffer_reg_channel_add(struct buffer_reg_session *session,
+ struct buffer_reg_channel *channel);
+struct buffer_reg_channel *buffer_reg_channel_find(uint64_t key,
+ struct buffer_reg_uid *reg);
+void buffer_reg_channel_remove(struct buffer_reg_session *session,
+ struct buffer_reg_channel *regp);
+void buffer_reg_channel_destroy(struct buffer_reg_channel *regp,
+ enum lttng_domain_type domain);
+
+/* Stream */
+int buffer_reg_stream_create(struct buffer_reg_stream **regp);
+void buffer_reg_stream_add(struct buffer_reg_stream *stream,
+ struct buffer_reg_channel *channel);
+void buffer_reg_stream_destroy(struct buffer_reg_stream *regp,
+ enum lttng_domain_type domain);
+
+/* Global registry. */
+void buffer_reg_destroy_registries(void);
+
+int buffer_reg_uid_consumer_channel_key(
+ struct cds_list_head *buffer_reg_uid_list,
+ uint64_t chan_key, uint64_t *consumer_chan_key);
+
+#endif /* LTTNG_BUFFER_REGISTRY_H */