2 * Copyright (C) 2011 EfficiOS Inc.
3 * Copyright (C) 2016 Jérémie Galarneau <jeremie.galarneau@efficios.com>
5 * SPDX-License-Identifier: GPL-2.0-only
10 #define _LTT_UST_APP_H
14 #include <common/index-allocator.hpp>
15 #include <common/format.hpp>
16 #include <common/uuid.hpp>
18 #include "trace-ust.hpp"
19 #include "ust-registry.hpp"
20 #include "ust-registry-session.hpp"
21 #include "session.hpp"
23 #define UST_APP_EVENT_LIST_SIZE 32
25 /* Process name (short). */
26 #define UST_APP_PROCNAME_LEN 16
28 struct lttng_bytecode;
29 struct lttng_ust_filter_bytecode;
31 extern int the_ust_consumerd64_fd, the_ust_consumerd32_fd;
34 * Object used to close the notify socket in a call_rcu(). Since the
35 * application might not be found, we need an independant object containing the
38 struct ust_app_notify_sock_obj {
43 struct ust_app_ht_key {
45 const struct lttng_bytecode *filter;
46 enum lttng_ust_abi_loglevel_type loglevel_type;
47 const struct lttng_event_exclusion *exclusion;
51 * Application registration data structure.
53 struct ust_register_msg {
54 enum lttng_ust_ctl_socket_type type;
63 uint32_t bits_per_long;
64 uint32_t uint8_t_alignment;
65 uint32_t uint16_t_alignment;
66 uint32_t uint32_t_alignment;
67 uint32_t uint64_t_alignment;
68 uint32_t long_alignment;
69 int byte_order; /* BIG_ENDIAN or LITTLE_ENDIAN */
70 char name[LTTNG_UST_ABI_PROCNAME_LEN];
74 * Global applications HT used by the session daemon. This table is indexed by
75 * PID using the pid_n node and pid value of an ust_app.
77 extern struct lttng_ht *ust_app_ht;
80 * Global applications HT used by the session daemon. This table is indexed by
81 * socket using the sock_n node and sock value of an ust_app.
83 * The 'sock' in question here is the 'command' socket.
85 extern struct lttng_ht *ust_app_ht_by_sock;
88 * Global applications HT used by the session daemon. This table is indexed by
89 * socket using the notify_sock_n node and notify_sock value of an ust_app.
91 extern struct lttng_ht *ust_app_ht_by_notify_sock;
93 /* Stream list containing ust_app_stream. */
94 struct ust_app_stream_list {
96 struct cds_list_head head;
101 struct lttng_ust_context_attr ctx;
102 struct lttng_ust_abi_object_data *obj;
103 struct lttng_ht_node_ulong node;
104 struct cds_list_head list;
107 struct ust_app_event {
110 struct lttng_ust_abi_object_data *obj;
111 struct lttng_ust_abi_event attr;
112 char name[LTTNG_UST_ABI_SYM_NAME_LEN];
113 struct lttng_ht_node_str node;
114 struct lttng_bytecode *filter;
115 struct lttng_event_exclusion *exclusion;
118 struct ust_app_event_notifier_rule {
120 uint64_t error_counter_index;
122 struct lttng_ust_abi_object_data *obj;
123 /* Holds a strong reference. */
124 struct lttng_trigger *trigger;
125 /* Unique ID returned by the tracer to identify this event notifier. */
127 struct lttng_ht_node_u64 node;
128 /* The trigger object owns the filter. */
129 const struct lttng_bytecode *filter;
131 struct lttng_event_exclusion *exclusion;
132 /* For delayed reclaim. */
133 struct rcu_head rcu_head;
136 struct ust_app_stream {
138 char pathname[PATH_MAX];
139 /* Format is %s_%d respectively channel name and CPU number. */
140 char name[DEFAULT_STREAM_NAME_LEN];
141 struct lttng_ust_abi_object_data *obj;
142 /* Using a list of streams to keep order. */
143 struct cds_list_head list;
146 struct ust_app_channel {
150 * Unique key used to identify the channel on the consumer side.
151 * 0 is a reserved 'invalid' value used to indicate that the consumer
152 * does not know about this channel (i.e. an error occurred).
155 /* Id of the tracing channel set on creation. */
156 uint64_t tracing_channel_id;
157 /* Number of stream that this channel is expected to receive. */
158 unsigned int expected_stream_count;
159 char name[LTTNG_UST_ABI_SYM_NAME_LEN];
160 struct lttng_ust_abi_object_data *obj;
161 struct lttng_ust_ctl_consumer_channel_attr attr;
162 struct ust_app_stream_list streams;
163 /* Session pointer that owns this object. */
164 struct ust_app_session *session;
166 * Contexts are kept in a hash table for fast lookup and in an ordered list
167 * so we are able to enable them on the tracer side in the same order the
170 struct lttng_ht *ctx;
171 struct cds_list_head ctx_list;
173 struct lttng_ht *events;
174 uint64_t tracefile_size;
175 uint64_t tracefile_count;
176 uint64_t monitor_timer_interval;
178 * Node indexed by channel name in the channels' hash table of a session.
180 struct lttng_ht_node_str node;
182 * Node indexed by UST channel object descriptor (handle). Stored in the
183 * ust_objd hash table in the ust_app object.
185 struct lttng_ht_node_ulong ust_objd_node;
186 /* For delayed reclaim */
187 struct rcu_head rcu_head;
190 struct ust_app_session {
192 * Lock protecting this session's ust app interaction. Held
193 * across command send/recv to/from app. Never nests within the
194 * session registry lock.
196 pthread_mutex_t lock;
199 /* started: has the session been in started state at any time ? */
200 int started; /* allows detection of start vs restart. */
201 int handle; /* used has unique identifier for app session */
203 bool deleted; /* Session deleted flag. Check with lock held. */
206 * Tracing session ID. Multiple ust app session can have the same tracing
207 * session id making this value NOT unique to the object.
210 uint64_t id; /* Unique session identifier */
211 struct lttng_ht *channels; /* Registered channels */
212 struct lttng_ht_node_u64 node;
214 * Node indexed by UST session object descriptor (handle). Stored in the
215 * ust_sessions_objd hash table in the ust_app object.
217 struct lttng_ht_node_ulong ust_objd_node;
218 /* Starts with 'ust'; no leading slash. */
220 /* UID/GID of the application owning the session */
221 struct lttng_credentials real_credentials;
222 /* Effective UID and GID. Same as the tracing session. */
223 struct lttng_credentials effective_credentials;
224 struct cds_list_head teardown_node;
226 * Once at least *one* session is created onto the application, the
227 * corresponding consumer is set so we can use it on unregistration.
229 struct consumer_output *consumer;
230 enum lttng_buffer_type buffer_type;
231 /* ABI of the session. Same value as the application. */
232 uint32_t bits_per_long;
233 /* For delayed reclaim */
234 struct rcu_head rcu_head;
235 /* If the channel's streams have to be outputed or not. */
236 unsigned int output_traces;
237 unsigned int live_timer_interval; /* usec */
239 /* Metadata channel attributes. */
240 struct lttng_ust_ctl_consumer_channel_attr metadata_attr;
242 char root_shm_path[PATH_MAX];
243 char shm_path[PATH_MAX];
247 * Registered traceable applications. Libust registers to the session daemon
248 * and a linked list is kept of all running traceable app.
252 pthread_mutex_t sock_lock; /* Protects sock protocol. */
257 uid_t uid; /* User ID that owns the apps */
258 gid_t gid; /* Group ID that owns the apps */
261 lttng::sessiond::trace::abi abi;
263 int compatible; /* If the lttng-ust tracer version does not match the
264 supported version of the session daemon, this flag is
265 set to 0 (NOT compatible) else 1. */
266 struct lttng_ust_abi_tracer_version version;
267 uint32_t v_major; /* Version major number */
268 uint32_t v_minor; /* Version minor number */
269 /* Extra for the NULL byte. */
270 char name[UST_APP_PROCNAME_LEN + 1];
271 /* Type of buffer this application uses. */
272 enum lttng_buffer_type buffer_type;
273 struct lttng_ht *sessions;
274 struct lttng_ht_node_ulong pid_n;
275 struct lttng_ht_node_ulong sock_n;
276 struct lttng_ht_node_ulong notify_sock_n;
278 * This is a list of ust app session that, once the app is going into
279 * teardown mode, in the RCU call, each node in this list is removed and
282 * Element of the list are added when an application unregisters after each
283 * ht_del of ust_app_session associated to this app. This list is NOT used
284 * when a session is destroyed.
286 struct cds_list_head teardown_head;
288 * Hash table containing ust_app_channel indexed by channel objd.
290 struct lttng_ht *ust_objd;
292 * Hash table containing ust_app_session indexed by objd.
294 struct lttng_ht *ust_sessions_objd;
297 * If this application is of the agent domain and this is non negative then
298 * a lookup MUST be done to acquire a read side reference to the
299 * corresponding agent app object. If the lookup fails, this should be set
300 * to a negative value indicating that the agent application is gone.
304 * Time at which the app is registred.
305 * Used for path creation
307 time_t registration_time;
313 * Handle to the lttng_ust object representing the event
316 struct lttng_ust_abi_object_data *object;
317 struct lttng_pipe *event_pipe;
318 struct lttng_ust_abi_object_data *counter;
319 struct lttng_ust_abi_object_data **counter_cpu;
321 } event_notifier_group;
323 * Hashtable indexing the application's event notifier rule's
324 * (ust_app_event_notifier_rule) by their token's value.
326 struct lttng_ht *token_to_event_notifier_rule_ht;
331 struct formatter<ust_app> : formatter<std::string> {
332 template <typename FormatCtx>
333 typename FormatCtx::iterator format(const ust_app& app, FormatCtx& ctx)
335 return format_to(ctx.out(),
336 "{{ procname = `{}`, ppid = {}, pid = {}, uid = {}, gid = {}, version = {}.{}, registration time = {} }}",
337 app.name, app.ppid, app.pid, app.uid, app.gid, app.v_major,
339 lttng::utils::time_to_iso8601_str(app.registration_time));
342 } /* namespace fmt */
344 #ifdef HAVE_LIBLTTNG_UST_CTL
346 int ust_app_register(struct ust_register_msg *msg, int sock);
347 int ust_app_register_done(struct ust_app *app);
348 int ust_app_version(struct ust_app *app);
349 void ust_app_unregister(int sock);
350 int ust_app_start_trace_all(struct ltt_ust_session *usess);
351 int ust_app_stop_trace_all(struct ltt_ust_session *usess);
352 int ust_app_destroy_trace_all(struct ltt_ust_session *usess);
353 int ust_app_list_events(struct lttng_event **events);
354 int ust_app_list_event_fields(struct lttng_event_field **fields);
355 int ust_app_create_event_glb(struct ltt_ust_session *usess,
356 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent);
357 int ust_app_disable_channel_glb(struct ltt_ust_session *usess,
358 struct ltt_ust_channel *uchan);
359 int ust_app_enable_channel_glb(struct ltt_ust_session *usess,
360 struct ltt_ust_channel *uchan);
361 int ust_app_enable_event_glb(struct ltt_ust_session *usess,
362 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent);
363 int ust_app_disable_event_glb(struct ltt_ust_session *usess,
364 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent);
365 int ust_app_add_ctx_channel_glb(struct ltt_ust_session *usess,
366 struct ltt_ust_channel *uchan, struct ltt_ust_context *uctx);
367 void ust_app_global_update(struct ltt_ust_session *usess, struct ust_app *app);
368 void ust_app_global_update_all(struct ltt_ust_session *usess);
369 void ust_app_global_update_event_notifier_rules(struct ust_app *app);
370 void ust_app_global_update_all_event_notifier_rules(void);
372 void ust_app_clean_list(void);
373 int ust_app_ht_alloc(void);
374 struct ust_app *ust_app_find_by_pid(pid_t pid);
375 struct ust_app_stream *ust_app_alloc_stream(void);
376 int ust_app_recv_registration(int sock, struct ust_register_msg *msg);
377 int ust_app_recv_notify(int sock);
378 void ust_app_add(struct ust_app *app);
379 struct ust_app *ust_app_create(struct ust_register_msg *msg, int sock);
380 void ust_app_notify_sock_unregister(int sock);
381 ssize_t ust_app_push_metadata(const lttng::sessiond::ust::registry_session::locked_ptr& registry,
382 struct consumer_socket *socket,
384 void ust_app_destroy(struct ust_app *app);
385 enum lttng_error_code ust_app_snapshot_record(
386 const struct ltt_ust_session *usess,
387 const struct consumer_output *output,
388 uint64_t nb_packets_per_stream);
389 uint64_t ust_app_get_size_one_more_packet_per_stream(
390 const struct ltt_ust_session *usess, uint64_t cur_nr_packets);
391 struct ust_app *ust_app_find_by_sock(int sock);
392 int ust_app_uid_get_channel_runtime_stats(uint64_t ust_session_id,
393 struct cds_list_head *buffer_reg_uid_list,
394 struct consumer_output *consumer, uint64_t uchan_id,
395 int overwrite, uint64_t *discarded, uint64_t *lost);
396 int ust_app_pid_get_channel_runtime_stats(struct ltt_ust_session *usess,
397 struct ltt_ust_channel *uchan,
398 struct consumer_output *consumer,
399 int overwrite, uint64_t *discarded, uint64_t *lost);
400 int ust_app_regenerate_statedump_all(struct ltt_ust_session *usess);
401 enum lttng_error_code ust_app_rotate_session(struct ltt_session *session);
402 enum lttng_error_code ust_app_create_channel_subdirectories(
403 const struct ltt_ust_session *session);
404 int ust_app_release_object(struct ust_app *app,
405 struct lttng_ust_abi_object_data *data);
406 enum lttng_error_code ust_app_clear_session(struct ltt_session *session);
407 enum lttng_error_code ust_app_open_packets(struct ltt_session *session);
409 int ust_app_setup_event_notifier_group(struct ust_app *app);
412 int ust_app_supported(void)
417 bool ust_app_supports_notifiers(const struct ust_app *app);
418 bool ust_app_supports_counters(const struct ust_app *app);
420 #else /* HAVE_LIBLTTNG_UST_CTL */
423 int ust_app_destroy_trace_all(
424 struct ltt_ust_session *usess __attribute__((unused)))
430 int ust_app_start_trace(
431 struct ltt_ust_session *usess __attribute__((unused)),
432 struct ust_app *app __attribute__((unused)))
438 int ust_app_start_trace_all(
439 struct ltt_ust_session *usess __attribute__((unused)))
445 int ust_app_stop_trace_all(
446 struct ltt_ust_session *usess __attribute__((unused)))
452 int ust_app_list_events(
453 struct lttng_event **events __attribute__((unused)))
459 int ust_app_list_event_fields(
460 struct lttng_event_field **fields __attribute__((unused)))
466 int ust_app_register(
467 struct ust_register_msg *msg __attribute__((unused)),
468 int sock __attribute__((unused)))
474 int ust_app_register_done(struct ust_app *app __attribute__((unused)))
480 int ust_app_version(struct ust_app *app __attribute__((unused)))
486 void ust_app_unregister(int sock __attribute__((unused)))
491 void ust_app_clean_list(void)
496 struct ust_app_list *ust_app_get_list(void)
502 struct ust_app *ust_app_get_by_pid(pid_t pid __attribute__((unused)))
508 int ust_app_ht_alloc(void)
514 void ust_app_global_update(
515 struct ltt_ust_session *usess __attribute__((unused)),
516 struct ust_app *app __attribute__((unused)))
520 void ust_app_global_update_event_notifier_rules(
521 struct ust_app *app __attribute__((unused)))
525 void ust_app_global_update_all_event_notifier_rules(void)
529 int ust_app_setup_event_notifier_group(
530 struct ust_app *app __attribute__((unused)))
536 int ust_app_disable_channel_glb(
537 struct ltt_ust_session *usess __attribute__((unused)),
538 struct ltt_ust_channel *uchan __attribute__((unused)))
544 int ust_app_enable_channel_glb(
545 struct ltt_ust_session *usess __attribute__((unused)),
546 struct ltt_ust_channel *uchan __attribute__((unused)))
552 int ust_app_create_event_glb(
553 struct ltt_ust_session *usess __attribute__((unused)),
554 struct ltt_ust_channel *uchan __attribute__((unused)),
555 struct ltt_ust_event *uevent __attribute__((unused)))
561 int ust_app_disable_event_glb(
562 struct ltt_ust_session *usess __attribute__((unused)),
563 struct ltt_ust_channel *uchan __attribute__((unused)),
564 struct ltt_ust_event *uevent __attribute__((unused)))
570 int ust_app_enable_event_glb(
571 struct ltt_ust_session *usess __attribute__((unused)),
572 struct ltt_ust_channel *uchan __attribute__((unused)),
573 struct ltt_ust_event *uevent __attribute__((unused)))
579 int ust_app_add_ctx_channel_glb(
580 struct ltt_ust_session *usess __attribute__((unused)),
581 struct ltt_ust_channel *uchan __attribute__((unused)),
582 struct ltt_ust_context *uctx __attribute__((unused)))
588 int ust_app_enable_event_pid(
589 struct ltt_ust_session *usess __attribute__((unused)),
590 struct ltt_ust_channel *uchan __attribute__((unused)),
591 struct ltt_ust_event *uevent __attribute__((unused)),
592 pid_t pid __attribute__((unused)))
598 int ust_app_recv_registration(
599 int sock __attribute__((unused)),
600 struct ust_register_msg *msg __attribute__((unused)))
606 int ust_app_recv_notify(int sock __attribute__((unused)))
612 struct ust_app *ust_app_create(
613 struct ust_register_msg *msg __attribute__((unused)),
614 int sock __attribute__((unused)))
620 void ust_app_add(struct ust_app *app __attribute__((unused)))
625 void ust_app_notify_sock_unregister(int sock __attribute__((unused)))
630 ssize_t ust_app_push_metadata(
631 lttng::sessiond::ust::registry_session *registry __attribute__((unused)),
632 struct consumer_socket *socket __attribute__((unused)),
633 int send_zero_data __attribute__((unused)))
639 void ust_app_destroy(struct ust_app *app __attribute__((unused)))
645 enum lttng_error_code ust_app_snapshot_record(
646 struct ltt_ust_session *usess __attribute__((unused)),
647 const struct consumer_output *output __attribute__((unused)),
648 uint64_t max_stream_size __attribute__((unused)))
650 return LTTNG_ERR_UNK;
654 unsigned int ust_app_get_nb_stream(
655 struct ltt_ust_session *usess __attribute__((unused)))
661 void ust_app_update_event_notifier_error_count(
662 struct lttng_trigger *lttng_trigger __attribute__((unused)))
668 int ust_app_supported(void)
674 bool ust_app_supports_notifiers(
675 const struct ust_app *app __attribute__((unused)))
681 bool ust_app_supports_counters(
682 const struct ust_app *app __attribute__((unused)))
688 struct ust_app *ust_app_find_by_sock(int sock __attribute__((unused)))
694 struct ust_app *ust_app_find_by_pid(pid_t pid __attribute__((unused)))
700 uint64_t ust_app_get_size_one_more_packet_per_stream(
701 const struct ltt_ust_session *usess __attribute__((unused)),
702 uint64_t cur_nr_packets __attribute__((unused))) {
707 int ust_app_uid_get_channel_runtime_stats(
708 uint64_t ust_session_id __attribute__((unused)),
709 struct cds_list_head *buffer_reg_uid_list __attribute__((unused)),
710 struct consumer_output *consumer __attribute__((unused)),
711 int overwrite __attribute__((unused)),
712 uint64_t uchan_id __attribute__((unused)),
713 uint64_t *discarded __attribute__((unused)),
714 uint64_t *lost __attribute__((unused)))
720 int ust_app_pid_get_channel_runtime_stats(
721 struct ltt_ust_session *usess __attribute__((unused)),
722 struct ltt_ust_channel *uchan __attribute__((unused)),
723 struct consumer_output *consumer __attribute__((unused)),
724 int overwrite __attribute__((unused)),
725 uint64_t *discarded __attribute__((unused)),
726 uint64_t *lost __attribute__((unused)))
732 int ust_app_regenerate_statedump_all(
733 struct ltt_ust_session *usess __attribute__((unused)))
739 enum lttng_error_code ust_app_rotate_session(
740 struct ltt_session *session __attribute__((unused)))
742 return LTTNG_ERR_UNK;
746 enum lttng_error_code ust_app_create_channel_subdirectories(
747 const struct ltt_ust_session *session __attribute__((unused)))
749 return LTTNG_ERR_UNK;
753 int ust_app_release_object(struct ust_app *app __attribute__((unused)),
754 struct lttng_ust_abi_object_data *data __attribute__((unused)))
760 enum lttng_error_code ust_app_clear_session(
761 struct ltt_session *session __attribute__((unused)))
763 return LTTNG_ERR_UNK;
767 enum lttng_error_code ust_app_open_packets(
768 struct ltt_session *session __attribute__((unused)))
770 return LTTNG_ERR_UNK;
773 #endif /* HAVE_LIBLTTNG_UST_CTL */
775 #endif /* _LTT_UST_APP_H */