Fix: cmd_rotate_session() returns unexpected error codes
[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
ffe60014 24#include <common/compat/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
143 * does not know about this channel (i.e. an error occured).
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;
bec39940 209 char path[PATH_MAX];
7972aab2 210 /* UID/GID of the application owning the session */
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211 uid_t uid;
212 gid_t gid;
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213 /* Effective UID and GID. Same as the tracing session. */
214 uid_t euid;
215 gid_t egid;
d42f20df 216 struct cds_list_head teardown_node;
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217 /*
218 * Once at least *one* session is created onto the application, the
219 * corresponding consumer is set so we can use it on unregistration.
220 */
221 struct consumer_output *consumer;
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222 enum lttng_buffer_type buffer_type;
223 /* ABI of the session. Same value as the application. */
224 uint32_t bits_per_long;
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225 /* For delayed reclaim */
226 struct rcu_head rcu_head;
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227 /* If the channel's streams have to be outputed or not. */
228 unsigned int output_traces;
ecc48a90 229 unsigned int live_timer_interval; /* usec */
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230
231 /* Metadata channel attributes. */
232 struct ustctl_consumer_channel_attr metadata_attr;
d7ba1388 233
3d071855 234 char root_shm_path[PATH_MAX];
d7ba1388 235 char shm_path[PATH_MAX];
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236};
237
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238/*
239 * Registered traceable applications. Libust registers to the session daemon
050349bb 240 * and a linked list is kept of all running traceable app.
91d76f53 241 */
56fff090 242struct ust_app {
852d0037 243 int sock;
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244 pthread_mutex_t sock_lock; /* Protects sock protocol. */
245
d0b96690 246 int notify_sock;
852d0037 247 pid_t pid;
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248 pid_t ppid;
249 uid_t uid; /* User ID that owns the apps */
aea829b3 250 gid_t gid; /* Group ID that owns the apps */
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251
252 /* App ABI */
253 uint32_t bits_per_long;
254 uint32_t uint8_t_alignment;
255 uint32_t uint16_t_alignment;
256 uint32_t uint32_t_alignment;
257 uint32_t uint64_t_alignment;
258 uint32_t long_alignment;
259 int byte_order; /* BIG_ENDIAN or LITTLE_ENDIAN */
260
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261 int compatible; /* If the lttng-ust tracer version does not match the
262 supported version of the session daemon, this flag is
263 set to 0 (NOT compatible) else 1. */
264 struct lttng_ust_tracer_version version;
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265 uint32_t v_major; /* Version major number */
266 uint32_t v_minor; /* Version minor number */
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267 /* Extra for the NULL byte. */
268 char name[UST_APP_PROCNAME_LEN + 1];
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269 /* Type of buffer this application uses. */
270 enum lttng_buffer_type buffer_type;
bec39940 271 struct lttng_ht *sessions;
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272 struct lttng_ht_node_ulong pid_n;
273 struct lttng_ht_node_ulong sock_n;
d0b96690 274 struct lttng_ht_node_ulong notify_sock_n;
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275 /*
276 * This is a list of ust app session that, once the app is going into
277 * teardown mode, in the RCU call, each node in this list is removed and
278 * deleted.
279 *
280 * Element of the list are added when an application unregisters after each
281 * ht_del of ust_app_session associated to this app. This list is NOT used
282 * when a session is destroyed.
283 */
284 struct cds_list_head teardown_head;
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285 /*
286 * Hash table containing ust_app_channel indexed by channel objd.
287 */
288 struct lttng_ht *ust_objd;
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289 /*
290 * Hash table containing ust_app_session indexed by objd.
291 */
292 struct lttng_ht *ust_sessions_objd;
022d91ba 293
f20baf8e 294 /*
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295 * If this application is of the agent domain and this is non negative then
296 * a lookup MUST be done to acquire a read side reference to the
297 * corresponding agent app object. If the lookup fails, this should be set
298 * to a negative value indicating that the agent application is gone.
f20baf8e 299 */
022d91ba 300 int agent_app_sock;
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301};
302
74d0b642 303#ifdef HAVE_LIBLTTNG_UST_CTL
3bd1e081 304
56fff090 305int ust_app_register(struct ust_register_msg *msg, int sock);
fb45065e 306int ust_app_register_done(struct ust_app *app);
d0b96690 307int ust_app_version(struct ust_app *app);
56fff090 308void ust_app_unregister(int sock);
421cb601 309int ust_app_start_trace_all(struct ltt_ust_session *usess);
8be98f9a 310int ust_app_stop_trace_all(struct ltt_ust_session *usess);
84cd17c6 311int ust_app_destroy_trace_all(struct ltt_ust_session *usess);
b551a063 312int ust_app_list_events(struct lttng_event **events);
f37d259d 313int ust_app_list_event_fields(struct lttng_event_field **fields);
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314int ust_app_create_channel_glb(struct ltt_ust_session *usess,
315 struct ltt_ust_channel *uchan);
316int ust_app_create_event_glb(struct ltt_ust_session *usess,
317 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent);
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318int ust_app_enable_event_pid(struct ltt_ust_session *usess,
319 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent,
320 pid_t pid);
35a9059d 321int ust_app_disable_channel_glb(struct ltt_ust_session *usess,
78f0bacd 322 struct ltt_ust_channel *uchan);
35a9059d 323int ust_app_enable_channel_glb(struct ltt_ust_session *usess,
78f0bacd 324 struct ltt_ust_channel *uchan);
35a9059d 325int ust_app_enable_event_glb(struct ltt_ust_session *usess,
edb67388 326 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent);
35a9059d 327int ust_app_enable_all_event_glb(struct ltt_ust_session *usess,
9730260e 328 struct ltt_ust_channel *uchan);
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329int ust_app_disable_event_glb(struct ltt_ust_session *usess,
330 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent);
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331int ust_app_add_ctx_channel_glb(struct ltt_ust_session *usess,
332 struct ltt_ust_channel *uchan, struct ltt_ust_context *uctx);
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333void ust_app_global_update(struct ltt_ust_session *usess, struct ust_app *app);
334void ust_app_global_update_all(struct ltt_ust_session *usess);
91d76f53 335
56fff090 336void ust_app_clean_list(void);
57703f6e 337int ust_app_ht_alloc(void);
f6a9efaa 338struct ust_app *ust_app_find_by_pid(pid_t pid);
ffe60014 339struct ust_app_stream *ust_app_alloc_stream(void);
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340int ust_app_recv_registration(int sock, struct ust_register_msg *msg);
341int ust_app_recv_notify(int sock);
342void ust_app_add(struct ust_app *app);
343struct ust_app *ust_app_create(struct ust_register_msg *msg, int sock);
d88aee68 344void ust_app_notify_sock_unregister(int sock);
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345ssize_t ust_app_push_metadata(struct ust_registry_session *registry,
346 struct consumer_socket *socket, int send_zero_data);
f45e313d 347void ust_app_destroy(struct ust_app *app);
6dc3064a 348int ust_app_snapshot_record(struct ltt_ust_session *usess,
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349 struct snapshot_output *output, int wait,
350 uint64_t nb_packets_per_stream);
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351uint64_t ust_app_get_size_one_more_packet_per_stream(
352 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);
92816cc3 363int ust_app_rotate_session(struct ltt_session *session);
44d3bd01 364
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365static inline
366int ust_app_supported(void)
367{
368 return 1;
369}
370
74d0b642 371#else /* HAVE_LIBLTTNG_UST_CTL */
3bd1e081 372
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373static inline
374int ust_app_destroy_trace_all(struct ltt_ust_session *usess)
375{
376 return 0;
377}
d974f197 378static inline
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379int ust_app_start_trace(struct ltt_ust_session *usess, struct ust_app *app)
380{
381 return 0;
382}
383static inline
384int ust_app_start_trace_all(struct ltt_ust_session *usess)
d974f197 385{
5cf5d0e7 386 return 0;
d974f197 387}
3bd1e081 388static inline
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389int ust_app_stop_trace_all(struct ltt_ust_session *usess)
390{
391 return 0;
392}
393static inline
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394int ust_app_list_events(struct lttng_event **events)
395{
db7c0497 396 return -ENOSYS;
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397}
398static inline
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399int ust_app_list_event_fields(struct lttng_event_field **fields)
400{
401 return -ENOSYS;
402}
403static inline
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404int ust_app_register(struct ust_register_msg *msg, int sock)
405{
406 return -ENOSYS;
407}
408static inline
fb45065e 409int ust_app_register_done(struct ust_app *app)
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410{
411 return -ENOSYS;
412}
413static inline
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414int ust_app_version(struct ust_app *app)
415{
416 return -ENOSYS;
417}
418static inline
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419void ust_app_unregister(int sock)
420{
421}
422static inline
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423void ust_app_lock_list(void)
424{
425}
426static inline
427void ust_app_unlock_list(void)
428{
429}
430static inline
431void ust_app_clean_list(void)
432{
433}
434static inline
435struct ust_app_list *ust_app_get_list(void)
436{
437 return NULL;
438}
439static inline
440struct ust_app *ust_app_get_by_pid(pid_t pid)
441{
442 return NULL;
443}
48842b30 444static inline
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445int ust_app_ht_alloc(void)
446{
447 return 0;
448}
cc920def 449static inline
3646a051 450void ust_app_global_update(struct ltt_ust_session *usess, struct ust_app *app)
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451{}
452static inline
35a9059d 453int ust_app_disable_channel_glb(struct ltt_ust_session *usess,
cc920def 454 struct ltt_ust_channel *uchan)
d974f197 455{
cc920def 456 return 0;
d974f197 457}
487cf67c 458static inline
35a9059d 459int ust_app_enable_channel_glb(struct ltt_ust_session *usess,
cc920def 460 struct ltt_ust_channel *uchan)
487cf67c 461{
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462 return 0;
463}
464static inline
35a9059d 465int ust_app_create_channel_glb(struct ltt_ust_session *usess,
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466 struct ltt_ust_channel *uchan)
467{
468 return 0;
469}
470static inline
35a9059d 471int ust_app_enable_all_event_glb(struct ltt_ust_session *usess,
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472 struct ltt_ust_channel *uchan)
473{
474 return 0;
475}
476static inline
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477int ust_app_create_event_glb(struct ltt_ust_session *usess,
478 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent)
479{
480 return 0;
481}
482static inline
483int ust_app_disable_event_glb(struct ltt_ust_session *usess,
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484 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent)
485{
486 return 0;
487cf67c 487}
edb67388 488static inline
35a9059d 489int ust_app_enable_event_glb(struct ltt_ust_session *usess,
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490 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent)
491{
492 return 0;
493}
55cc08a6 494static inline
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495int ust_app_add_ctx_channel_glb(struct ltt_ust_session *usess,
496 struct ltt_ust_channel *uchan, struct ltt_ust_context *uctx)
497{
498 return 0;
499}
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500static inline
501int ust_app_enable_event_pid(struct ltt_ust_session *usess,
502 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent,
503 pid_t pid)
504{
505 return 0;
506}
7f79d3a1 507static inline
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508int ust_app_recv_registration(int sock, struct ust_register_msg *msg)
509{
510 return 0;
511}
512static inline
513int ust_app_recv_notify(int sock)
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514{
515 return 0;
516}
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517static inline
518struct ust_app *ust_app_create(struct ust_register_msg *msg, int sock)
519{
520 return NULL;
521}
522static inline
523void ust_app_add(struct ust_app *app)
524{
525}
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526static inline
527void ust_app_notify_sock_unregister(int sock)
528{
529}
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530static inline
531ssize_t ust_app_push_metadata(struct ust_registry_session *registry,
532 struct consumer_socket *socket, int send_zero_data)
533{
534 return 0;
535}
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536static inline
537void ust_app_destroy(struct ust_app *app)
538{
539 return;
540}
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541static inline
542int ust_app_snapshot_record(struct ltt_ust_session *usess,
68808f4e 543 struct snapshot_output *output, int wait, uint64_t max_stream_size)
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544{
545 return 0;
546}
547static inline
548unsigned int ust_app_get_nb_stream(struct ltt_ust_session *usess)
6dc3064a
DG
549{
550 return 0;
551}
48842b30 552
b51ec5b4
MD
553static inline
554int ust_app_supported(void)
555{
556 return 0;
557}
f20baf8e
DG
558static inline
559struct ust_app *ust_app_find_by_sock(int sock)
560{
561 return NULL;
562}
95b1d17c
DG
563static inline
564struct ust_app *ust_app_find_by_pid(pid_t pid)
565{
566 return NULL;
567}
16f35901
JG
568static inline
569uint64_t ust_app_get_size_one_more_packet_per_stream(
570 struct ltt_ust_session *usess, uint64_t cur_nr_packets) {
571 return 0;
572}
fb83fe64
JD
573static inline
574int ust_app_uid_get_channel_runtime_stats(uint64_t ust_session_id,
575 struct cds_list_head *buffer_reg_uid_list,
576 struct consumer_output *consumer, int overwrite,
577 uint64_t uchan_id, uint64_t *discarded, uint64_t *lost)
578{
579 return 0;
580}
581
582static inline
583int ust_app_pid_get_channel_runtime_stats(struct ltt_ust_session *usess,
584 struct ltt_ust_channel *uchan,
585 struct consumer_output *consumer,
586 int overwrite, uint64_t *discarded, uint64_t *lost)
587{
588 return 0;
589}
b51ec5b4 590
6f698634
JG
591static inline
592int ust_app_regenerate_statedump_all(struct ltt_ust_session *usess)
593{
594 return 0;
595}
596
5c408ad8 597static inline
d5a1b7aa 598enum lttng_error_code ust_app_rotate_session(struct ltt_session *session)
5c408ad8
JD
599{
600 return 0;
601}
602
74d0b642 603#endif /* HAVE_LIBLTTNG_UST_CTL */
3bd1e081 604
f6a9efaa 605#endif /* _LTT_UST_APP_H */
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