trackers: add sessiond tracker list implementation
[lttng-tools.git] / src / bin / lttng-sessiond / ust-app.h
CommitLineData
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1/*
2 * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
bdf64013 3 * Copyright (C) 2016 - Jérémie Galarneau <jeremie.galarneau@efficios.com>
91d76f53 4 *
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5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License, version 2 only,
7 * as published by the Free Software Foundation.
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8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
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14 * You should have received a copy of the GNU General Public License along
15 * with this program; if not, write to the Free Software Foundation, Inc.,
16 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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17 */
18
2106efa0 19#ifndef _LTT_UST_APP_H
f6a9efaa 20#define _LTT_UST_APP_H
91d76f53 21
099e26bd 22#include <stdint.h>
1e307fab 23
c70636a7 24#include <common/uuid.h>
f20baf8e 25
44d3bd01 26#include "trace-ust.h"
d0b96690 27#include "ust-registry.h"
5c408ad8 28#include "session.h"
44d3bd01 29
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30#define UST_APP_EVENT_LIST_SIZE 32
31
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32/* Process name (short). */
33#define UST_APP_PROCNAME_LEN 16
d0b96690 34
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35struct lttng_filter_bytecode;
36struct lttng_ust_filter_bytecode;
37
7753dea8 38extern int ust_consumerd64_fd, ust_consumerd32_fd;
ba5d816e 39
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40/*
41 * Object used to close the notify socket in a call_rcu(). Since the
42 * application might not be found, we need an independant object containing the
43 * notify socket fd.
44 */
45struct ust_app_notify_sock_obj {
46 int fd;
47 struct rcu_head head;
48};
49
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50struct ust_app_ht_key {
51 const char *name;
51755dc8 52 const struct lttng_filter_bytecode *filter;
2106efa0 53 enum lttng_ust_loglevel_type loglevel_type;
51755dc8 54 const struct lttng_event_exclusion *exclusion;
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55};
56
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57/*
58 * Application registration data structure.
59 */
60struct ust_register_msg {
d0b96690 61 enum ustctl_socket_type type;
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62 uint32_t major;
63 uint32_t minor;
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64 uint32_t abi_major;
65 uint32_t abi_minor;
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66 pid_t pid;
67 pid_t ppid;
68 uid_t uid;
69 gid_t gid;
0df502fd 70 uint32_t bits_per_long;
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71 uint32_t uint8_t_alignment;
72 uint32_t uint16_t_alignment;
73 uint32_t uint32_t_alignment;
74 uint32_t uint64_t_alignment;
75 uint32_t long_alignment;
76 int byte_order; /* BIG_ENDIAN or LITTLE_ENDIAN */
77 char name[LTTNG_UST_ABI_PROCNAME_LEN];
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78};
79
48842b30 80/*
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81 * Global applications HT used by the session daemon. This table is indexed by
82 * PID using the pid_n node and pid value of an ust_app.
48842b30 83 */
bec39940 84struct lttng_ht *ust_app_ht;
f6a9efaa 85
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86/*
87 * Global applications HT used by the session daemon. This table is indexed by
88 * socket using the sock_n node and sock value of an ust_app.
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89 *
90 * The 'sock' in question here is the 'command' socket.
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91 */
92struct lttng_ht *ust_app_ht_by_sock;
91d76f53 93
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94/*
95 * Global applications HT used by the session daemon. This table is indexed by
96 * socket using the notify_sock_n node and notify_sock value of an ust_app.
97 */
98struct lttng_ht *ust_app_ht_by_notify_sock;
99
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100/* Stream list containing ust_app_stream. */
101struct ust_app_stream_list {
102 unsigned int count;
103 struct cds_list_head head;
104};
105
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106struct ust_app_ctx {
107 int handle;
bdf64013 108 struct lttng_ust_context_attr ctx;
55cc08a6 109 struct lttng_ust_object_data *obj;
bec39940 110 struct lttng_ht_node_ulong node;
31746f93 111 struct cds_list_head list;
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112};
113
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114struct ust_app_event {
115 int enabled;
116 int handle;
13161846 117 struct lttng_ust_object_data *obj;
284d8f55 118 struct lttng_ust_event attr;
48842b30 119 char name[LTTNG_UST_SYM_NAME_LEN];
bec39940 120 struct lttng_ht_node_str node;
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121 struct lttng_filter_bytecode *filter;
122 struct lttng_event_exclusion *exclusion;
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123};
124
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125struct ust_app_stream {
126 int handle;
127 char pathname[PATH_MAX];
128 /* Format is %s_%d respectively channel name and CPU number. */
129 char name[DEFAULT_STREAM_NAME_LEN];
130 struct lttng_ust_object_data *obj;
131 /* Using a list of streams to keep order. */
132 struct cds_list_head list;
133};
134
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135struct ust_app_channel {
136 int enabled;
137 int handle;
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138 /* Channel and streams were sent to the UST tracer. */
139 int is_sent;
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140 /*
141 * Unique key used to identify the channel on the consumer side.
142 * 0 is a reserved 'invalid' value used to indicate that the consumer
a9577b76 143 * does not know about this channel (i.e. an error occurred).
dda154b8 144 */
d88aee68 145 uint64_t key;
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146 /* Id of the tracing channel set on creation. */
147 uint64_t tracing_channel_id;
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148 /* Number of stream that this channel is expected to receive. */
149 unsigned int expected_stream_count;
48842b30 150 char name[LTTNG_UST_SYM_NAME_LEN];
13161846 151 struct lttng_ust_object_data *obj;
ffe60014 152 struct ustctl_consumer_channel_attr attr;
030a66fa 153 struct ust_app_stream_list streams;
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154 /* Session pointer that owns this object. */
155 struct ust_app_session *session;
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156 /*
157 * Contexts are kept in a hash table for fast lookup and in an ordered list
158 * so we are able to enable them on the tracer side in the same order the
159 * user added them.
160 */
bec39940 161 struct lttng_ht *ctx;
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162 struct cds_list_head ctx_list;
163
bec39940 164 struct lttng_ht *events;
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165 uint64_t tracefile_size;
166 uint64_t tracefile_count;
e9404c27 167 uint64_t monitor_timer_interval;
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168 /*
169 * Node indexed by channel name in the channels' hash table of a session.
170 */
bec39940 171 struct lttng_ht_node_str node;
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172 /*
173 * Node indexed by UST channel object descriptor (handle). Stored in the
174 * ust_objd hash table in the ust_app object.
175 */
176 struct lttng_ht_node_ulong ust_objd_node;
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177 /* For delayed reclaim */
178 struct rcu_head rcu_head;
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179};
180
181struct ust_app_session {
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182 /*
183 * Lock protecting this session's ust app interaction. Held
184 * across command send/recv to/from app. Never nests within the
185 * session registry lock.
186 */
187 pthread_mutex_t lock;
188
48842b30 189 int enabled;
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190 /* started: has the session been in started state at any time ? */
191 int started; /* allows detection of start vs restart. */
a991f516 192 int handle; /* used has unique identifier for app session */
7972aab2 193
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194 bool deleted; /* Session deleted flag. Check with lock held. */
195
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196 /*
197 * Tracing session ID. Multiple ust app session can have the same tracing
198 * session id making this value NOT unique to the object.
199 */
d9bf3ca4 200 uint64_t tracing_id;
7972aab2 201 uint64_t id; /* Unique session identifier */
bec39940 202 struct lttng_ht *channels; /* Registered channels */
d9bf3ca4 203 struct lttng_ht_node_u64 node;
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204 /*
205 * Node indexed by UST session object descriptor (handle). Stored in the
206 * ust_sessions_objd hash table in the ust_app object.
207 */
208 struct lttng_ht_node_ulong ust_objd_node;
d2956687 209 /* Starts with 'ust'; no leading slash. */
bec39940 210 char path[PATH_MAX];
7972aab2 211 /* UID/GID of the application owning the session */
470cc211 212 struct lttng_credentials real_credentials;
7972aab2 213 /* Effective UID and GID. Same as the tracing session. */
470cc211 214 struct lttng_credentials effective_credentials;
d42f20df 215 struct cds_list_head teardown_node;
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216 /*
217 * Once at least *one* session is created onto the application, the
218 * corresponding consumer is set so we can use it on unregistration.
219 */
220 struct consumer_output *consumer;
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221 enum lttng_buffer_type buffer_type;
222 /* ABI of the session. Same value as the application. */
223 uint32_t bits_per_long;
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224 /* For delayed reclaim */
225 struct rcu_head rcu_head;
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226 /* If the channel's streams have to be outputed or not. */
227 unsigned int output_traces;
ecc48a90 228 unsigned int live_timer_interval; /* usec */
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229
230 /* Metadata channel attributes. */
231 struct ustctl_consumer_channel_attr metadata_attr;
d7ba1388 232
3d071855 233 char root_shm_path[PATH_MAX];
d7ba1388 234 char shm_path[PATH_MAX];
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235};
236
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237/*
238 * Registered traceable applications. Libust registers to the session daemon
050349bb 239 * and a linked list is kept of all running traceable app.
91d76f53 240 */
56fff090 241struct ust_app {
852d0037 242 int sock;
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243 pthread_mutex_t sock_lock; /* Protects sock protocol. */
244
d0b96690 245 int notify_sock;
852d0037 246 pid_t pid;
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247 pid_t ppid;
248 uid_t uid; /* User ID that owns the apps */
aea829b3 249 gid_t gid; /* Group ID that owns the apps */
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250
251 /* App ABI */
252 uint32_t bits_per_long;
253 uint32_t uint8_t_alignment;
254 uint32_t uint16_t_alignment;
255 uint32_t uint32_t_alignment;
256 uint32_t uint64_t_alignment;
257 uint32_t long_alignment;
258 int byte_order; /* BIG_ENDIAN or LITTLE_ENDIAN */
259
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260 int compatible; /* If the lttng-ust tracer version does not match the
261 supported version of the session daemon, this flag is
262 set to 0 (NOT compatible) else 1. */
263 struct lttng_ust_tracer_version version;
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264 uint32_t v_major; /* Version major number */
265 uint32_t v_minor; /* Version minor number */
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266 /* Extra for the NULL byte. */
267 char name[UST_APP_PROCNAME_LEN + 1];
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268 /* Type of buffer this application uses. */
269 enum lttng_buffer_type buffer_type;
bec39940 270 struct lttng_ht *sessions;
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271 struct lttng_ht_node_ulong pid_n;
272 struct lttng_ht_node_ulong sock_n;
d0b96690 273 struct lttng_ht_node_ulong notify_sock_n;
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274 /*
275 * This is a list of ust app session that, once the app is going into
276 * teardown mode, in the RCU call, each node in this list is removed and
277 * deleted.
278 *
279 * Element of the list are added when an application unregisters after each
280 * ht_del of ust_app_session associated to this app. This list is NOT used
281 * when a session is destroyed.
282 */
283 struct cds_list_head teardown_head;
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284 /*
285 * Hash table containing ust_app_channel indexed by channel objd.
286 */
287 struct lttng_ht *ust_objd;
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288 /*
289 * Hash table containing ust_app_session indexed by objd.
290 */
291 struct lttng_ht *ust_sessions_objd;
022d91ba 292
f20baf8e 293 /*
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294 * If this application is of the agent domain and this is non negative then
295 * a lookup MUST be done to acquire a read side reference to the
296 * corresponding agent app object. If the lookup fails, this should be set
297 * to a negative value indicating that the agent application is gone.
f20baf8e 298 */
022d91ba 299 int agent_app_sock;
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300 /*
301 * Time at which the app is registred.
302 * Used for path creation
303 */
304 time_t registration_time;
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305};
306
74d0b642 307#ifdef HAVE_LIBLTTNG_UST_CTL
3bd1e081 308
56fff090 309int ust_app_register(struct ust_register_msg *msg, int sock);
fb45065e 310int ust_app_register_done(struct ust_app *app);
d0b96690 311int ust_app_version(struct ust_app *app);
56fff090 312void ust_app_unregister(int sock);
421cb601 313int ust_app_start_trace_all(struct ltt_ust_session *usess);
8be98f9a 314int ust_app_stop_trace_all(struct ltt_ust_session *usess);
84cd17c6 315int ust_app_destroy_trace_all(struct ltt_ust_session *usess);
b551a063 316int ust_app_list_events(struct lttng_event **events);
f37d259d 317int ust_app_list_event_fields(struct lttng_event_field **fields);
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318int ust_app_create_channel_glb(struct ltt_ust_session *usess,
319 struct ltt_ust_channel *uchan);
320int ust_app_create_event_glb(struct ltt_ust_session *usess,
321 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent);
322int ust_app_disable_channel_glb(struct ltt_ust_session *usess,
78f0bacd 323 struct ltt_ust_channel *uchan);
35a9059d 324int ust_app_enable_channel_glb(struct ltt_ust_session *usess,
78f0bacd 325 struct ltt_ust_channel *uchan);
35a9059d 326int ust_app_enable_event_glb(struct ltt_ust_session *usess,
edb67388 327 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent);
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328int ust_app_disable_event_glb(struct ltt_ust_session *usess,
329 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent);
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330int ust_app_add_ctx_channel_glb(struct ltt_ust_session *usess,
331 struct ltt_ust_channel *uchan, struct ltt_ust_context *uctx);
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332void ust_app_global_update(struct ltt_ust_session *usess, struct ust_app *app);
333void ust_app_global_update_all(struct ltt_ust_session *usess);
91d76f53 334
56fff090 335void ust_app_clean_list(void);
57703f6e 336int ust_app_ht_alloc(void);
f6a9efaa 337struct ust_app *ust_app_find_by_pid(pid_t pid);
ffe60014 338struct ust_app_stream *ust_app_alloc_stream(void);
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339int ust_app_recv_registration(int sock, struct ust_register_msg *msg);
340int ust_app_recv_notify(int sock);
341void ust_app_add(struct ust_app *app);
342struct ust_app *ust_app_create(struct ust_register_msg *msg, int sock);
d88aee68 343void ust_app_notify_sock_unregister(int sock);
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344ssize_t ust_app_push_metadata(struct ust_registry_session *registry,
345 struct consumer_socket *socket, int send_zero_data);
f45e313d 346void ust_app_destroy(struct ust_app *app);
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347enum lttng_error_code ust_app_snapshot_record(
348 const struct ltt_ust_session *usess,
348a81dc 349 const struct consumer_output *output, int wait,
d07ceecd 350 uint64_t nb_packets_per_stream);
16f35901 351uint64_t ust_app_get_size_one_more_packet_per_stream(
fb9a95c4 352 const struct ltt_ust_session *usess, uint64_t cur_nr_packets);
f20baf8e 353struct ust_app *ust_app_find_by_sock(int sock);
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354int ust_app_uid_get_channel_runtime_stats(uint64_t ust_session_id,
355 struct cds_list_head *buffer_reg_uid_list,
356 struct consumer_output *consumer, uint64_t uchan_id,
357 int overwrite, uint64_t *discarded, uint64_t *lost);
358int ust_app_pid_get_channel_runtime_stats(struct ltt_ust_session *usess,
359 struct ltt_ust_channel *uchan,
360 struct consumer_output *consumer,
361 int overwrite, uint64_t *discarded, uint64_t *lost);
c2561365 362int ust_app_regenerate_statedump_all(struct ltt_ust_session *usess);
6f6d3b69 363enum lttng_error_code ust_app_rotate_session(struct ltt_session *session);
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364enum lttng_error_code ust_app_create_channel_subdirectories(
365 const struct ltt_ust_session *session);
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366int ust_app_release_object(struct ust_app *app,
367 struct lttng_ust_object_data *data);
4a9b9759 368enum lttng_error_code ust_app_clear_session(struct ltt_session *session);
44d3bd01 369
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370static inline
371int ust_app_supported(void)
372{
373 return 1;
374}
375
74d0b642 376#else /* HAVE_LIBLTTNG_UST_CTL */
3bd1e081 377
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378static inline
379int ust_app_destroy_trace_all(struct ltt_ust_session *usess)
380{
381 return 0;
382}
d974f197 383static inline
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384int ust_app_start_trace(struct ltt_ust_session *usess, struct ust_app *app)
385{
386 return 0;
387}
388static inline
389int ust_app_start_trace_all(struct ltt_ust_session *usess)
d974f197 390{
5cf5d0e7 391 return 0;
d974f197 392}
3bd1e081 393static inline
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394int ust_app_stop_trace_all(struct ltt_ust_session *usess)
395{
396 return 0;
397}
398static inline
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399int ust_app_list_events(struct lttng_event **events)
400{
db7c0497 401 return -ENOSYS;
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402}
403static inline
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404int ust_app_list_event_fields(struct lttng_event_field **fields)
405{
406 return -ENOSYS;
407}
408static inline
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409int ust_app_register(struct ust_register_msg *msg, int sock)
410{
411 return -ENOSYS;
412}
413static inline
fb45065e 414int ust_app_register_done(struct ust_app *app)
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415{
416 return -ENOSYS;
417}
418static inline
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419int ust_app_version(struct ust_app *app)
420{
421 return -ENOSYS;
422}
423static inline
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424void ust_app_unregister(int sock)
425{
426}
427static inline
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428void ust_app_lock_list(void)
429{
430}
431static inline
432void ust_app_unlock_list(void)
433{
434}
435static inline
436void ust_app_clean_list(void)
437{
438}
439static inline
440struct ust_app_list *ust_app_get_list(void)
441{
442 return NULL;
443}
444static inline
445struct ust_app *ust_app_get_by_pid(pid_t pid)
446{
447 return NULL;
448}
48842b30 449static inline
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450int ust_app_ht_alloc(void)
451{
452 return 0;
453}
cc920def 454static inline
3646a051 455void ust_app_global_update(struct ltt_ust_session *usess, struct ust_app *app)
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456{}
457static inline
35a9059d 458int ust_app_disable_channel_glb(struct ltt_ust_session *usess,
cc920def 459 struct ltt_ust_channel *uchan)
d974f197 460{
cc920def 461 return 0;
d974f197 462}
487cf67c 463static inline
35a9059d 464int ust_app_enable_channel_glb(struct ltt_ust_session *usess,
cc920def 465 struct ltt_ust_channel *uchan)
487cf67c 466{
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467 return 0;
468}
469static inline
35a9059d 470int ust_app_create_channel_glb(struct ltt_ust_session *usess,
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471 struct ltt_ust_channel *uchan)
472{
473 return 0;
474}
475static inline
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476int ust_app_create_event_glb(struct ltt_ust_session *usess,
477 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent)
478{
479 return 0;
480}
481static inline
482int ust_app_disable_event_glb(struct ltt_ust_session *usess,
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483 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent)
484{
485 return 0;
487cf67c 486}
edb67388 487static inline
35a9059d 488int ust_app_enable_event_glb(struct ltt_ust_session *usess,
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489 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent)
490{
491 return 0;
492}
55cc08a6 493static inline
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494int ust_app_add_ctx_channel_glb(struct ltt_ust_session *usess,
495 struct ltt_ust_channel *uchan, struct ltt_ust_context *uctx)
496{
497 return 0;
498}
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499static inline
500int ust_app_enable_event_pid(struct ltt_ust_session *usess,
501 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent,
502 pid_t pid)
503{
504 return 0;
505}
7f79d3a1 506static inline
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507int ust_app_recv_registration(int sock, struct ust_register_msg *msg)
508{
509 return 0;
510}
511static inline
512int ust_app_recv_notify(int sock)
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513{
514 return 0;
515}
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516static inline
517struct ust_app *ust_app_create(struct ust_register_msg *msg, int sock)
518{
519 return NULL;
520}
521static inline
522void ust_app_add(struct ust_app *app)
523{
524}
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525static inline
526void ust_app_notify_sock_unregister(int sock)
527{
528}
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529static inline
530ssize_t ust_app_push_metadata(struct ust_registry_session *registry,
531 struct consumer_socket *socket, int send_zero_data)
532{
533 return 0;
534}
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535static inline
536void ust_app_destroy(struct ust_app *app)
537{
538 return;
539}
6dc3064a 540static inline
9a654598 541enum lttng_error_code ust_app_snapshot_record(struct ltt_ust_session *usess,
3637639a 542 const struct consumer_output *output, int wait, uint64_t max_stream_size)
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543{
544 return 0;
545}
546static inline
547unsigned int ust_app_get_nb_stream(struct ltt_ust_session *usess)
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548{
549 return 0;
550}
48842b30 551
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552static inline
553int ust_app_supported(void)
554{
555 return 0;
556}
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557static inline
558struct ust_app *ust_app_find_by_sock(int sock)
559{
560 return NULL;
561}
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562static inline
563struct ust_app *ust_app_find_by_pid(pid_t pid)
564{
565 return NULL;
566}
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567static inline
568uint64_t ust_app_get_size_one_more_packet_per_stream(
1f4fc770 569 const struct ltt_ust_session *usess, uint64_t cur_nr_packets) {
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570 return 0;
571}
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572static inline
573int ust_app_uid_get_channel_runtime_stats(uint64_t ust_session_id,
574 struct cds_list_head *buffer_reg_uid_list,
575 struct consumer_output *consumer, int overwrite,
576 uint64_t uchan_id, uint64_t *discarded, uint64_t *lost)
577{
578 return 0;
579}
580
581static inline
582int ust_app_pid_get_channel_runtime_stats(struct ltt_ust_session *usess,
583 struct ltt_ust_channel *uchan,
584 struct consumer_output *consumer,
585 int overwrite, uint64_t *discarded, uint64_t *lost)
586{
587 return 0;
588}
b51ec5b4 589
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590static inline
591int ust_app_regenerate_statedump_all(struct ltt_ust_session *usess)
592{
593 return 0;
594}
595
5c408ad8 596static inline
d5a1b7aa 597enum lttng_error_code ust_app_rotate_session(struct ltt_session *session)
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598{
599 return 0;
600}
601
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602static inline
603enum lttng_error_code ust_app_create_channel_subdirectories(
604 const struct ltt_ust_session *session)
605{
606 return 0;
607}
608
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609static inline
610int ust_app_release_object(struct ust_app *app, struct lttng_ust_object_data *data)
611{
612 return 0;
613}
614
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615static inline
616enum lttng_error_code ust_app_clear_session(struct ltt_session *session)
617{
618 return 0;
619}
620
74d0b642 621#endif /* HAVE_LIBLTTNG_UST_CTL */
3bd1e081 622
f6a9efaa 623#endif /* _LTT_UST_APP_H */
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