SoW-2019-0002: Dynamic Snapshot
[lttng-tools.git] / src / bin / lttng-sessiond / ust-app.h
CommitLineData
91d76f53 1/*
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2 * Copyright (C) 2011 David Goulet <david.goulet@polymtl.ca>
3 * Copyright (C) 2016 Jérémie Galarneau <jeremie.galarneau@efficios.com>
91d76f53 4 *
ab5be9fa 5 * SPDX-License-Identifier: GPL-2.0-only
91d76f53 6 *
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7 */
8
2106efa0 9#ifndef _LTT_UST_APP_H
f6a9efaa 10#define _LTT_UST_APP_H
91d76f53 11
099e26bd 12#include <stdint.h>
1e307fab 13
c70636a7 14#include <common/uuid.h>
f20baf8e 15
44d3bd01 16#include "trace-ust.h"
d0b96690 17#include "ust-registry.h"
5c408ad8 18#include "session.h"
44d3bd01 19
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20#define UST_APP_EVENT_LIST_SIZE 32
21
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22/* Process name (short). */
23#define UST_APP_PROCNAME_LEN 16
d0b96690 24
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25struct lttng_filter_bytecode;
26struct lttng_ust_filter_bytecode;
27
7753dea8 28extern int ust_consumerd64_fd, ust_consumerd32_fd;
ba5d816e 29
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30/*
31 * Object used to close the notify socket in a call_rcu(). Since the
32 * application might not be found, we need an independant object containing the
33 * notify socket fd.
34 */
35struct ust_app_notify_sock_obj {
36 int fd;
37 struct rcu_head head;
38};
39
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40struct ust_app_ht_key {
41 const char *name;
51755dc8 42 const struct lttng_filter_bytecode *filter;
2106efa0 43 enum lttng_ust_loglevel_type loglevel_type;
51755dc8 44 const struct lttng_event_exclusion *exclusion;
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45};
46
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47/*
48 * Application registration data structure.
49 */
50struct ust_register_msg {
d0b96690 51 enum ustctl_socket_type type;
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52 uint32_t major;
53 uint32_t minor;
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54 uint32_t abi_major;
55 uint32_t abi_minor;
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56 pid_t pid;
57 pid_t ppid;
58 uid_t uid;
59 gid_t gid;
0df502fd 60 uint32_t bits_per_long;
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61 uint32_t uint8_t_alignment;
62 uint32_t uint16_t_alignment;
63 uint32_t uint32_t_alignment;
64 uint32_t uint64_t_alignment;
65 uint32_t long_alignment;
66 int byte_order; /* BIG_ENDIAN or LITTLE_ENDIAN */
67 char name[LTTNG_UST_ABI_PROCNAME_LEN];
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68};
69
48842b30 70/*
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71 * Global applications HT used by the session daemon. This table is indexed by
72 * PID using the pid_n node and pid value of an ust_app.
48842b30 73 */
44cdb3a2 74extern struct lttng_ht *ust_app_ht;
f6a9efaa 75
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76/*
77 * Global applications HT used by the session daemon. This table is indexed by
78 * socket using the sock_n node and sock value of an ust_app.
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79 *
80 * The 'sock' in question here is the 'command' socket.
852d0037 81 */
44cdb3a2 82extern struct lttng_ht *ust_app_ht_by_sock;
91d76f53 83
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84/*
85 * Global applications HT used by the session daemon. This table is indexed by
86 * socket using the notify_sock_n node and notify_sock value of an ust_app.
87 */
44cdb3a2 88extern struct lttng_ht *ust_app_ht_by_notify_sock;
d0b96690 89
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90/* Stream list containing ust_app_stream. */
91struct ust_app_stream_list {
92 unsigned int count;
93 struct cds_list_head head;
94};
95
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96struct ust_app_ctx {
97 int handle;
bdf64013 98 struct lttng_ust_context_attr ctx;
55cc08a6 99 struct lttng_ust_object_data *obj;
bec39940 100 struct lttng_ht_node_ulong node;
31746f93 101 struct cds_list_head list;
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102};
103
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104struct ust_app_event {
105 int enabled;
106 int handle;
13161846 107 struct lttng_ust_object_data *obj;
284d8f55 108 struct lttng_ust_event attr;
48842b30 109 char name[LTTNG_UST_SYM_NAME_LEN];
bec39940 110 struct lttng_ht_node_str node;
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111 struct lttng_filter_bytecode *filter;
112 struct lttng_event_exclusion *exclusion;
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113};
114
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115struct ust_app_token_event_rule {
116 int enabled;
117 int handle;
118 struct lttng_ust_object_data *obj;
119 struct lttng_event_rule *event_rule;
120 uint64_t token;
121 struct lttng_ht_node_u64 node;
122 /* The event_rule object own this pointer */
123 const struct lttng_filter_bytecode *filter;
124 /* The event_rule object own this pointer */
125 struct lttng_event_exclusion *exclusion;
126};
127
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128struct ust_app_stream {
129 int handle;
130 char pathname[PATH_MAX];
131 /* Format is %s_%d respectively channel name and CPU number. */
132 char name[DEFAULT_STREAM_NAME_LEN];
133 struct lttng_ust_object_data *obj;
134 /* Using a list of streams to keep order. */
135 struct cds_list_head list;
136};
137
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138struct ust_app_channel {
139 int enabled;
140 int handle;
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141 /* Channel and streams were sent to the UST tracer. */
142 int is_sent;
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143 /*
144 * Unique key used to identify the channel on the consumer side.
145 * 0 is a reserved 'invalid' value used to indicate that the consumer
a9577b76 146 * does not know about this channel (i.e. an error occurred).
dda154b8 147 */
d88aee68 148 uint64_t key;
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149 /* Id of the tracing channel set on creation. */
150 uint64_t tracing_channel_id;
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151 /* Number of stream that this channel is expected to receive. */
152 unsigned int expected_stream_count;
48842b30 153 char name[LTTNG_UST_SYM_NAME_LEN];
13161846 154 struct lttng_ust_object_data *obj;
ffe60014 155 struct ustctl_consumer_channel_attr attr;
030a66fa 156 struct ust_app_stream_list streams;
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157 /* Session pointer that owns this object. */
158 struct ust_app_session *session;
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159 /*
160 * Contexts are kept in a hash table for fast lookup and in an ordered list
161 * so we are able to enable them on the tracer side in the same order the
162 * user added them.
163 */
bec39940 164 struct lttng_ht *ctx;
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165 struct cds_list_head ctx_list;
166
bec39940 167 struct lttng_ht *events;
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168 uint64_t tracefile_size;
169 uint64_t tracefile_count;
e9404c27 170 uint64_t monitor_timer_interval;
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171 /*
172 * Node indexed by channel name in the channels' hash table of a session.
173 */
bec39940 174 struct lttng_ht_node_str node;
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175 /*
176 * Node indexed by UST channel object descriptor (handle). Stored in the
177 * ust_objd hash table in the ust_app object.
178 */
179 struct lttng_ht_node_ulong ust_objd_node;
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180 /* For delayed reclaim */
181 struct rcu_head rcu_head;
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182};
183
184struct ust_app_session {
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185 /*
186 * Lock protecting this session's ust app interaction. Held
187 * across command send/recv to/from app. Never nests within the
188 * session registry lock.
189 */
190 pthread_mutex_t lock;
191
48842b30 192 int enabled;
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193 /* started: has the session been in started state at any time ? */
194 int started; /* allows detection of start vs restart. */
a991f516 195 int handle; /* used has unique identifier for app session */
7972aab2 196
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197 bool deleted; /* Session deleted flag. Check with lock held. */
198
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199 /*
200 * Tracing session ID. Multiple ust app session can have the same tracing
201 * session id making this value NOT unique to the object.
202 */
d9bf3ca4 203 uint64_t tracing_id;
7972aab2 204 uint64_t id; /* Unique session identifier */
bec39940 205 struct lttng_ht *channels; /* Registered channels */
d9bf3ca4 206 struct lttng_ht_node_u64 node;
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207 /*
208 * Node indexed by UST session object descriptor (handle). Stored in the
209 * ust_sessions_objd hash table in the ust_app object.
210 */
211 struct lttng_ht_node_ulong ust_objd_node;
d2956687 212 /* Starts with 'ust'; no leading slash. */
bec39940 213 char path[PATH_MAX];
7972aab2 214 /* UID/GID of the application owning the session */
470cc211 215 struct lttng_credentials real_credentials;
7972aab2 216 /* Effective UID and GID. Same as the tracing session. */
470cc211 217 struct lttng_credentials effective_credentials;
d42f20df 218 struct cds_list_head teardown_node;
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219 /*
220 * Once at least *one* session is created onto the application, the
221 * corresponding consumer is set so we can use it on unregistration.
222 */
223 struct consumer_output *consumer;
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224 enum lttng_buffer_type buffer_type;
225 /* ABI of the session. Same value as the application. */
226 uint32_t bits_per_long;
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227 /* For delayed reclaim */
228 struct rcu_head rcu_head;
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229 /* If the channel's streams have to be outputed or not. */
230 unsigned int output_traces;
ecc48a90 231 unsigned int live_timer_interval; /* usec */
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232
233 /* Metadata channel attributes. */
234 struct ustctl_consumer_channel_attr metadata_attr;
d7ba1388 235
3d071855 236 char root_shm_path[PATH_MAX];
d7ba1388 237 char shm_path[PATH_MAX];
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238};
239
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240/*
241 * Registered traceable applications. Libust registers to the session daemon
050349bb 242 * and a linked list is kept of all running traceable app.
91d76f53 243 */
56fff090 244struct ust_app {
852d0037 245 int sock;
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246 pthread_mutex_t sock_lock; /* Protects sock protocol. */
247
d0b96690 248 int notify_sock;
852d0037 249 pid_t pid;
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250 pid_t ppid;
251 uid_t uid; /* User ID that owns the apps */
aea829b3 252 gid_t gid; /* Group ID that owns the apps */
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253
254 /* App ABI */
255 uint32_t bits_per_long;
256 uint32_t uint8_t_alignment;
257 uint32_t uint16_t_alignment;
258 uint32_t uint32_t_alignment;
259 uint32_t uint64_t_alignment;
260 uint32_t long_alignment;
261 int byte_order; /* BIG_ENDIAN or LITTLE_ENDIAN */
262
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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_tracer_version version;
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267 uint32_t v_major; /* Version major number */
268 uint32_t v_minor; /* Version minor number */
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269 /* Extra for the NULL byte. */
270 char name[UST_APP_PROCNAME_LEN + 1];
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271 /* Type of buffer this application uses. */
272 enum lttng_buffer_type buffer_type;
bec39940 273 struct lttng_ht *sessions;
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274 struct lttng_ht_node_ulong pid_n;
275 struct lttng_ht_node_ulong sock_n;
d0b96690 276 struct lttng_ht_node_ulong notify_sock_n;
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277 /*
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
280 * deleted.
281 *
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.
285 */
286 struct cds_list_head teardown_head;
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287 /*
288 * Hash table containing ust_app_channel indexed by channel objd.
289 */
290 struct lttng_ht *ust_objd;
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291 /*
292 * Hash table containing ust_app_session indexed by objd.
293 */
294 struct lttng_ht *ust_sessions_objd;
022d91ba 295
f20baf8e 296 /*
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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.
f20baf8e 301 */
022d91ba 302 int agent_app_sock;
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303 /*
304 * Time at which the app is registred.
305 * Used for path creation
306 */
307 time_t registration_time;
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308 /*
309 * Trigger
310 */
311 struct {
312 struct lttng_ust_object_data *handle;
313 struct lttng_pipe *trigger_event_pipe;
314 } token_communication;
315 struct lttng_ht *tokens_ht;
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316};
317
74d0b642 318#ifdef HAVE_LIBLTTNG_UST_CTL
3bd1e081 319
56fff090 320int ust_app_register(struct ust_register_msg *msg, int sock);
fb45065e 321int ust_app_register_done(struct ust_app *app);
d0b96690 322int ust_app_version(struct ust_app *app);
56fff090 323void ust_app_unregister(int sock);
421cb601 324int ust_app_start_trace_all(struct ltt_ust_session *usess);
8be98f9a 325int ust_app_stop_trace_all(struct ltt_ust_session *usess);
84cd17c6 326int ust_app_destroy_trace_all(struct ltt_ust_session *usess);
b551a063 327int ust_app_list_events(struct lttng_event **events);
f37d259d 328int ust_app_list_event_fields(struct lttng_event_field **fields);
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329int ust_app_create_event_glb(struct ltt_ust_session *usess,
330 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent);
331int ust_app_disable_channel_glb(struct ltt_ust_session *usess,
78f0bacd 332 struct ltt_ust_channel *uchan);
35a9059d 333int ust_app_enable_channel_glb(struct ltt_ust_session *usess,
78f0bacd 334 struct ltt_ust_channel *uchan);
35a9059d 335int ust_app_enable_event_glb(struct ltt_ust_session *usess,
edb67388 336 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent);
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337int ust_app_disable_event_glb(struct ltt_ust_session *usess,
338 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent);
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339int ust_app_add_ctx_channel_glb(struct ltt_ust_session *usess,
340 struct ltt_ust_channel *uchan, struct ltt_ust_context *uctx);
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341void ust_app_global_update(struct ltt_ust_session *usess, struct ust_app *app);
342void ust_app_global_update_all(struct ltt_ust_session *usess);
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343void ust_app_global_update_tokens(struct ust_app *app);
344void ust_app_global_update_all_tokens(void);
91d76f53 345
56fff090 346void ust_app_clean_list(void);
57703f6e 347int ust_app_ht_alloc(void);
f6a9efaa 348struct ust_app *ust_app_find_by_pid(pid_t pid);
ffe60014 349struct ust_app_stream *ust_app_alloc_stream(void);
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350int ust_app_recv_registration(int sock, struct ust_register_msg *msg);
351int ust_app_recv_notify(int sock);
352void ust_app_add(struct ust_app *app);
353struct ust_app *ust_app_create(struct ust_register_msg *msg, int sock);
d88aee68 354void ust_app_notify_sock_unregister(int sock);
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355ssize_t ust_app_push_metadata(struct ust_registry_session *registry,
356 struct consumer_socket *socket, int send_zero_data);
f45e313d 357void ust_app_destroy(struct ust_app *app);
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358enum lttng_error_code ust_app_snapshot_record(
359 const struct ltt_ust_session *usess,
348a81dc 360 const struct consumer_output *output, int wait,
d07ceecd 361 uint64_t nb_packets_per_stream);
16f35901 362uint64_t ust_app_get_size_one_more_packet_per_stream(
fb9a95c4 363 const struct ltt_ust_session *usess, uint64_t cur_nr_packets);
f20baf8e 364struct ust_app *ust_app_find_by_sock(int sock);
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365int ust_app_uid_get_channel_runtime_stats(uint64_t ust_session_id,
366 struct cds_list_head *buffer_reg_uid_list,
367 struct consumer_output *consumer, uint64_t uchan_id,
368 int overwrite, uint64_t *discarded, uint64_t *lost);
369int ust_app_pid_get_channel_runtime_stats(struct ltt_ust_session *usess,
370 struct ltt_ust_channel *uchan,
371 struct consumer_output *consumer,
372 int overwrite, uint64_t *discarded, uint64_t *lost);
c2561365 373int ust_app_regenerate_statedump_all(struct ltt_ust_session *usess);
6f6d3b69 374enum lttng_error_code ust_app_rotate_session(struct ltt_session *session);
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375enum lttng_error_code ust_app_create_channel_subdirectories(
376 const struct ltt_ust_session *session);
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377int ust_app_release_object(struct ust_app *app,
378 struct lttng_ust_object_data *data);
4a9b9759 379enum lttng_error_code ust_app_clear_session(struct ltt_session *session);
44d3bd01 380
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381int ust_app_setup_trigger_group(struct ust_app *app);
382
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383static inline
384int ust_app_supported(void)
385{
386 return 1;
387}
388
74d0b642 389#else /* HAVE_LIBLTTNG_UST_CTL */
3bd1e081 390
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391static inline
392int ust_app_destroy_trace_all(struct ltt_ust_session *usess)
393{
394 return 0;
395}
d974f197 396static inline
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397int ust_app_start_trace(struct ltt_ust_session *usess, struct ust_app *app)
398{
399 return 0;
400}
401static inline
402int ust_app_start_trace_all(struct ltt_ust_session *usess)
d974f197 403{
5cf5d0e7 404 return 0;
d974f197 405}
3bd1e081 406static inline
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407int ust_app_stop_trace_all(struct ltt_ust_session *usess)
408{
409 return 0;
410}
411static inline
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412int ust_app_list_events(struct lttng_event **events)
413{
db7c0497 414 return -ENOSYS;
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415}
416static inline
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417int ust_app_list_event_fields(struct lttng_event_field **fields)
418{
419 return -ENOSYS;
420}
421static inline
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422int ust_app_register(struct ust_register_msg *msg, int sock)
423{
424 return -ENOSYS;
425}
426static inline
fb45065e 427int ust_app_register_done(struct ust_app *app)
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428{
429 return -ENOSYS;
430}
431static inline
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432int ust_app_version(struct ust_app *app)
433{
434 return -ENOSYS;
435}
436static inline
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437void ust_app_unregister(int sock)
438{
439}
440static inline
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441void ust_app_lock_list(void)
442{
443}
444static inline
445void ust_app_unlock_list(void)
446{
447}
448static inline
449void ust_app_clean_list(void)
450{
451}
452static inline
453struct ust_app_list *ust_app_get_list(void)
454{
455 return NULL;
456}
457static inline
458struct ust_app *ust_app_get_by_pid(pid_t pid)
459{
460 return NULL;
461}
48842b30 462static inline
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463int ust_app_ht_alloc(void)
464{
465 return 0;
466}
cc920def 467static inline
3646a051 468void ust_app_global_update(struct ltt_ust_session *usess, struct ust_app *app)
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469{}
470static inline
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471void ust_app_global_update_tokens(struct ust_app *app)
472{}
473static inline
474void ust_app_global_update_all_tokens(void)
475{}
476static inline
477int ust_app_setup_trigger_group(struct ust_app *app)
478{
479 return 0;
480}
481static inline
35a9059d 482int ust_app_disable_channel_glb(struct ltt_ust_session *usess,
cc920def 483 struct ltt_ust_channel *uchan)
d974f197 484{
cc920def 485 return 0;
d974f197 486}
487cf67c 487static inline
35a9059d 488int ust_app_enable_channel_glb(struct ltt_ust_session *usess,
cc920def 489 struct ltt_ust_channel *uchan)
487cf67c 490{
cc920def
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491 return 0;
492}
493static inline
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494int ust_app_create_event_glb(struct ltt_ust_session *usess,
495 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent)
496{
497 return 0;
498}
499static inline
500int ust_app_disable_event_glb(struct ltt_ust_session *usess,
cc920def
DG
501 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent)
502{
503 return 0;
487cf67c 504}
edb67388 505static inline
35a9059d 506int ust_app_enable_event_glb(struct ltt_ust_session *usess,
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507 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent)
508{
509 return 0;
510}
55cc08a6 511static inline
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512int ust_app_add_ctx_channel_glb(struct ltt_ust_session *usess,
513 struct ltt_ust_channel *uchan, struct ltt_ust_context *uctx)
514{
515 return 0;
516}
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517static inline
518int ust_app_enable_event_pid(struct ltt_ust_session *usess,
519 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent,
520 pid_t pid)
521{
522 return 0;
523}
7f79d3a1 524static inline
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525int ust_app_recv_registration(int sock, struct ust_register_msg *msg)
526{
527 return 0;
528}
529static inline
530int ust_app_recv_notify(int sock)
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531{
532 return 0;
533}
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534static inline
535struct ust_app *ust_app_create(struct ust_register_msg *msg, int sock)
536{
537 return NULL;
538}
539static inline
540void ust_app_add(struct ust_app *app)
541{
542}
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543static inline
544void ust_app_notify_sock_unregister(int sock)
545{
546}
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547static inline
548ssize_t ust_app_push_metadata(struct ust_registry_session *registry,
549 struct consumer_socket *socket, int send_zero_data)
550{
551 return 0;
552}
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553static inline
554void ust_app_destroy(struct ust_app *app)
555{
556 return;
557}
6dc3064a 558static inline
9a654598 559enum lttng_error_code ust_app_snapshot_record(struct ltt_ust_session *usess,
3637639a 560 const struct consumer_output *output, int wait, uint64_t max_stream_size)
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561{
562 return 0;
563}
564static inline
565unsigned int ust_app_get_nb_stream(struct ltt_ust_session *usess)
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566{
567 return 0;
568}
48842b30 569
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570static inline
571int ust_app_supported(void)
572{
573 return 0;
574}
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575static inline
576struct ust_app *ust_app_find_by_sock(int sock)
577{
578 return NULL;
579}
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580static inline
581struct ust_app *ust_app_find_by_pid(pid_t pid)
582{
583 return NULL;
584}
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585static inline
586uint64_t ust_app_get_size_one_more_packet_per_stream(
1f4fc770 587 const struct ltt_ust_session *usess, uint64_t cur_nr_packets) {
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588 return 0;
589}
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590static inline
591int ust_app_uid_get_channel_runtime_stats(uint64_t ust_session_id,
592 struct cds_list_head *buffer_reg_uid_list,
593 struct consumer_output *consumer, int overwrite,
594 uint64_t uchan_id, uint64_t *discarded, uint64_t *lost)
595{
596 return 0;
597}
598
599static inline
600int ust_app_pid_get_channel_runtime_stats(struct ltt_ust_session *usess,
601 struct ltt_ust_channel *uchan,
602 struct consumer_output *consumer,
603 int overwrite, uint64_t *discarded, uint64_t *lost)
604{
605 return 0;
606}
b51ec5b4 607
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608static inline
609int ust_app_regenerate_statedump_all(struct ltt_ust_session *usess)
610{
611 return 0;
612}
613
5c408ad8 614static inline
d5a1b7aa 615enum lttng_error_code ust_app_rotate_session(struct ltt_session *session)
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616{
617 return 0;
618}
619
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620static inline
621enum lttng_error_code ust_app_create_channel_subdirectories(
622 const struct ltt_ust_session *session)
623{
624 return 0;
625}
626
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627static inline
628int ust_app_release_object(struct ust_app *app, struct lttng_ust_object_data *data)
629{
630 return 0;
631}
632
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633static inline
634enum lttng_error_code ust_app_clear_session(struct ltt_session *session)
635{
636 return 0;
637}
638
74d0b642 639#endif /* HAVE_LIBLTTNG_UST_CTL */
3bd1e081 640
f6a9efaa 641#endif /* _LTT_UST_APP_H */
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