#include "trace-class.hpp"
#include "ust-clock-class.hpp"
#include "ust-registry-channel.hpp"
+#include "ust-registry.hpp"
#include <common/make-unique-wrapper.hpp>
namespace sessiond {
namespace ust {
+class registry_enum;
class registry_session;
namespace details {
deleter>;
virtual lttng_buffer_type get_buffering_scheme() const noexcept = 0;
- locked_ptr lock();
+ locked_ptr lock() noexcept;
void add_channel(uint64_t channel_key);
+
+ /* A channel is protected by its parent registry session's lock. */
lttng::sessiond::ust::registry_channel& get_channel(uint64_t channel_key) const;
+
void remove_channel(uint64_t channel_key, bool notify);
+ void create_or_find_enum(int session_objd,
+ const char *enum_name,
+ struct lttng_ust_ctl_enum_entry *raw_entries,
+ size_t nr_entries,
+ uint64_t *enum_id);
+ registry_enum::const_rcu_protected_reference get_enumeration(
+ const char *enum_name, uint64_t enum_id) const;
+
void regenerate_metadata();
virtual ~registry_session();
* Also acts as a registry serialization lock. Used by registry
* readers to serialize the registry information sent from the
* sessiond to the consumerd.
+ *
* The consumer socket lock nests within this lock.
*/
mutable pthread_mutex_t _lock;
+
+ /* Generated metadata, not null-terminated. */
+ char *_metadata = nullptr; /* */
+ size_t _metadata_len = 0;
+ /* Length of bytes sent to the consumer. */
+ size_t _metadata_len_sent = 0;
+ /* Current version of the metadata. */
+ uint64_t _metadata_version = 0;
+
+ /*
+ * Unique key to identify the metadata on the consumer side.
+ */
+ uint64_t _metadata_key = 0;
+ /*
+ * Indicates if the metadata is closed on the consumer side. This is to
+ * avoid double close of metadata when an application unregisters AND
+ * deletes its sessions.
+ */
+ bool _metadata_closed = false;
+
+protected:
+ /* Prevent instanciation of this base class. */
+ registry_session(const struct lttng::sessiond::trace::abi& abi,
+ unsigned int app_tracer_version_major,
+ unsigned int app_tracer_version_minor,
+ const char *root_shm_path,
+ const char *shm_path,
+ uid_t euid,
+ gid_t egid,
+ uint64_t tracing_id);
+ virtual void _visit_environment(
+ lttng::sessiond::trace::trace_class_visitor& trace_class_visitor)
+ const override;
+ void _generate_metadata();
+
+private:
+ uint32_t _get_next_channel_id();
+ void _increase_metadata_size(size_t reservation_length);
+ void _append_metadata_fragment(const std::string& fragment);
+ void _reset_metadata();
+ void _destroy_enum(registry_enum *reg_enum);
+ registry_enum *_lookup_enum(const registry_enum *target_enum) const;
+
+ virtual void _accept_on_clock_classes(
+ lttng::sessiond::trace::trace_class_visitor& trace_class_visitor)
+ const override final;
+ virtual void _accept_on_stream_classes(
+ lttng::sessiond::trace::trace_class_visitor& trace_class_visitor)
+ const override final;
+
/* Next channel ID available for a newly registered channel. */
uint32_t _next_channel_id = 0;
+
/* Once this value reaches UINT32_MAX, no more id can be allocated. */
uint32_t _used_channel_id = 0;
+
/* Next enumeration ID available. */
uint64_t _next_enum_id = 0;
- /* Generated metadata. */
- char *_metadata = nullptr; /* NOT null-terminated ! Use memcpy. */
- size_t _metadata_len = 0, _metadata_alloc_len = 0;
- /* Length of bytes sent to the consumer. */
- size_t _metadata_len_sent = 0;
- /* Current version of the metadata. */
- uint64_t _metadata_version = 0;
+ size_t _metadata_alloc_len = 0;
/*
* Those fields are only used when a session is created with
* metadata_fd is a file descriptor that points to the file at
* 'metadata_path'.
*/
- char _root_shm_path[PATH_MAX] = {};
- char _shm_path[PATH_MAX] = {};
- char _metadata_path[PATH_MAX] = {};
+ const std::string _root_shm_path;
+ const std::string _shm_path;
+ const std::string _metadata_path;
+
/* File-backed metadata FD */
int _metadata_fd = -1;
*/
lttng_ht::uptr _channels;
- /*
- * Unique key to identify the metadata on the consumer side.
- */
- uint64_t _metadata_key = 0;
- /*
- * Indicates if the metadata is closed on the consumer side. This is to
- * avoid double close of metadata when an application unregisters AND
- * deletes its sessions.
- */
- bool _metadata_closed = false;
-
- /* User and group owning the session. */
- uid_t _uid = -1;
- gid_t _gid = -1;
-
/* Enumerations table. */
lttng_ht::uptr _enums;
+ /* User and group owning the session. */
+ const uid_t _uid;
+ const gid_t _gid;
+
/*
* Copy of the tracer version when the first app is registered.
* It is used if we need to regenerate the metadata.
*/
- uint32_t _app_tracer_version_major = 0;
- uint32_t _app_tracer_version_minor = 0;
-
- /* The id of the parent session */
- ltt_session::id_t _tracing_id = -1ULL;
+ const struct {
+ uint32_t major, minor;
+ } _app_tracer_version;
-protected:
- /* Prevent instanciation of this base class. */
- registry_session(const struct lttng::sessiond::trace::abi& abi,
- unsigned int app_tracer_version_major,
- unsigned int app_tracer_version_minor,
- const char *root_shm_path,
- const char *shm_path,
- uid_t euid,
- gid_t egid,
- uint64_t tracing_id);
- virtual void _visit_environment(
- lttng::sessiond::trace::trace_class_visitor& trace_class_visitor)
- const override;
- void _generate_metadata();
-
-private:
- uint32_t _get_next_channel_id();
- void _increase_metadata_size(size_t reservation_length);
- void _append_metadata_fragment(const std::string& fragment);
- void _reset_metadata();
-
- virtual void _accept_on_clock_classes(
- lttng::sessiond::trace::trace_class_visitor& trace_class_visitor)
- const override final;
- virtual void _accept_on_stream_classes(
- lttng::sessiond::trace::trace_class_visitor& trace_class_visitor)
- const override final;
+ /* The id of the parent session. */
+ const ltt_session::id_t _tracing_id;
lttng::sessiond::ust::clock_class _clock;
const lttng::sessiond::trace::trace_class_visitor::cuptr _metadata_generating_visitor;
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