include/lttng/ust-ctl.h

   1 /*
   2  * Copyright (C) 2011 - Julien Desfossez <julien.desfossez@polymtl.ca>
   3  * Copyright (C) 2011-2013 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; version 2 of the License only.
   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  *
  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.
  17  */
  18
  19 #ifndef _LTTNG_UST_CTL_H
  20 #define _LTTNG_UST_CTL_H
  21
  22 #include <lttng/ust-abi.h>
  23 #include <sys/types.h>
  24 #include <limits.h>
  25
  26 #ifndef LTTNG_UST_UUID_LEN
  27 #define LTTNG_UST_UUID_LEN      16
  28 #endif
  29
  30 /* Default unix socket path */
  31 #define LTTNG_UST_SOCK_FILENAME                                 \
  32         "lttng-ust-sock-"                                       \
  33         __ust_stringify(LTTNG_UST_ABI_MAJOR_VERSION)
  34
  35 /*
  36  * Shared memory files path are automatically related to shm root, e.g.
  37  * /dev/shm under linux.
  38  */
  39 #define LTTNG_UST_WAIT_FILENAME                                 \
  40         "lttng-ust-wait-"                                       \
  41         __ust_stringify(LTTNG_UST_ABI_MAJOR_VERSION)
  42
  43 struct lttng_ust_shm_handle;
  44 struct lttng_ust_lib_ring_buffer;
  45
  46 struct ustctl_consumer_channel_attr {
  47         enum lttng_ust_chan_type type;
  48         uint64_t subbuf_size;                   /* bytes */
  49         uint64_t num_subbuf;                    /* power of 2 */
  50         int overwrite;                          /* 1: overwrite, 0: discard */
  51         unsigned int switch_timer_interval;     /* usec */
  52         unsigned int read_timer_interval;       /* usec */
  53         enum lttng_ust_output output;           /* splice, mmap */
  54         uint32_t chan_id;                       /* channel ID */
  55         unsigned char uuid[LTTNG_UST_UUID_LEN]; /* Trace session unique ID */
  56 } LTTNG_PACKED;
  57
  58 /*
  59  * API used by sessiond.
  60  */
  61
  62 struct lttng_ust_context_attr {
  63         enum lttng_ust_context_type ctx;
  64         union {
  65                 struct lttng_ust_perf_counter_ctx perf_counter;
  66                 struct {
  67                         char *provider_name;
  68                         char *ctx_name;
  69                 } app_ctx;
  70         } u;
  71 };
  72
  73 /*
  74  * Error values: all the following functions return:
  75  * >= 0: Success (LTTNG_UST_OK)
  76  * < 0: error code.
  77  */
  78 int ustctl_register_done(int sock);
  79 int ustctl_create_session(int sock);
  80 int ustctl_create_event(int sock, struct lttng_ust_event *ev,
  81                 struct lttng_ust_object_data *channel_data,
  82                 struct lttng_ust_object_data **event_data);
  83 int ustctl_add_context(int sock, struct lttng_ust_context_attr *ctx,
  84                 struct lttng_ust_object_data *obj_data,
  85                 struct lttng_ust_object_data **context_data);
  86 int ustctl_set_filter(int sock, struct lttng_ust_filter_bytecode *bytecode,
  87                 struct lttng_ust_object_data *obj_data);
  88 int ustctl_set_exclusion(int sock, struct lttng_ust_event_exclusion *exclusion,
  89                 struct lttng_ust_object_data *obj_data);
  90
  91 int ustctl_enable(int sock, struct lttng_ust_object_data *object);
  92 int ustctl_disable(int sock, struct lttng_ust_object_data *object);
  93 int ustctl_start_session(int sock, int handle);
  94 int ustctl_stop_session(int sock, int handle);
  95
  96 /*
  97  * ustctl_tracepoint_list returns a tracepoint list handle, or negative
  98  * error value.
  99  */
 100 int ustctl_tracepoint_list(int sock);
 101
 102 /*
 103  * ustctl_tracepoint_list_get is used to iterate on the tp list
 104  * handle. End is iteration is reached when -LTTNG_UST_ERR_NOENT is
 105  * returned.
 106  */
 107 int ustctl_tracepoint_list_get(int sock, int tp_list_handle,
 108                 struct lttng_ust_tracepoint_iter *iter);
 109
 110 /*
 111  * ustctl_tracepoint_field_list returns a tracepoint field list handle,
 112  * or negative error value.
 113  */
 114 int ustctl_tracepoint_field_list(int sock);
 115
 116 /*
 117  * ustctl_tracepoint_field_list_get is used to iterate on the tp field
 118  * list handle. End is iteration is reached when -LTTNG_UST_ERR_NOENT is
 119  * returned.
 120  */
 121 int ustctl_tracepoint_field_list_get(int sock, int tp_field_list_handle,
 122                 struct lttng_ust_field_iter *iter);
 123
 124 int ustctl_tracer_version(int sock, struct lttng_ust_tracer_version *v);
 125 int ustctl_wait_quiescent(int sock);
 126
 127 int ustctl_sock_flush_buffer(int sock, struct lttng_ust_object_data *object);
 128
 129 int ustctl_calibrate(int sock, struct lttng_ust_calibrate *calibrate);
 130
 131 /* Release object created by members of this API. */
 132 int ustctl_release_object(int sock, struct lttng_ust_object_data *data);
 133 /* Release handle returned by create session. */
 134 int ustctl_release_handle(int sock, int handle);
 135
 136 int ustctl_recv_channel_from_consumer(int sock,
 137                 struct lttng_ust_object_data **channel_data);
 138 int ustctl_recv_stream_from_consumer(int sock,
 139                 struct lttng_ust_object_data **stream_data);
 140 int ustctl_send_channel_to_ust(int sock, int session_handle,
 141                 struct lttng_ust_object_data *channel_data);
 142 int ustctl_send_stream_to_ust(int sock,
 143                 struct lttng_ust_object_data *channel_data,
 144                 struct lttng_ust_object_data *stream_data);
 145
 146 /*
 147  * ustctl_duplicate_ust_object_data allocated a new object in "dest" if
 148  * it succeeds (returns 0). It must be released using
 149  * ustctl_release_object() and then freed with free().
 150  */
 151 int ustctl_duplicate_ust_object_data(struct lttng_ust_object_data **dest,
 152                 struct lttng_ust_object_data *src);
 153
 154 /*
 155  * API used by consumer.
 156  */
 157
 158 struct ustctl_consumer_channel;
 159 struct ustctl_consumer_stream;
 160 struct ustctl_consumer_channel_attr;
 161
 162 int ustctl_get_nr_stream_per_channel(void);
 163
 164 struct ustctl_consumer_channel *
 165         ustctl_create_channel(struct ustctl_consumer_channel_attr *attr,
 166                 const int *stream_fds, int nr_stream_fds);
 167 /*
 168  * Each stream created needs to be destroyed before calling
 169  * ustctl_destroy_channel().
 170  */
 171 void ustctl_destroy_channel(struct ustctl_consumer_channel *chan);
 172
 173 int ustctl_send_channel_to_sessiond(int sock,
 174                 struct ustctl_consumer_channel *channel);
 175 int ustctl_channel_close_wait_fd(struct ustctl_consumer_channel *consumer_chan);
 176 int ustctl_channel_close_wakeup_fd(struct ustctl_consumer_channel *consumer_chan);
 177 int ustctl_channel_get_wait_fd(struct ustctl_consumer_channel *consumer_chan);
 178 int ustctl_channel_get_wakeup_fd(struct ustctl_consumer_channel *consumer_chan);
 179
 180 int ustctl_write_metadata_to_channel(
 181                 struct ustctl_consumer_channel *channel,
 182                 const char *metadata_str,       /* NOT null-terminated */
 183                 size_t len);                    /* metadata length */
 184 ssize_t ustctl_write_one_packet_to_channel(
 185                 struct ustctl_consumer_channel *channel,
 186                 const char *metadata_str,       /* NOT null-terminated */
 187                 size_t len);                    /* metadata length */
 188
 189 /*
 190  * Send a NULL stream to finish iteration over all streams of a given
 191  * channel.
 192  */
 193 int ustctl_send_stream_to_sessiond(int sock,
 194                 struct ustctl_consumer_stream *stream);
 195 int ustctl_stream_close_wait_fd(struct ustctl_consumer_stream *stream);
 196 int ustctl_stream_close_wakeup_fd(struct ustctl_consumer_stream *stream);
 197 int ustctl_stream_get_wait_fd(struct ustctl_consumer_stream *stream);
 198 int ustctl_stream_get_wakeup_fd(struct ustctl_consumer_stream *stream);
 199
 200 /* Create/destroy stream buffers for read */
 201 struct ustctl_consumer_stream *
 202         ustctl_create_stream(struct ustctl_consumer_channel *channel,
 203                         int cpu);
 204 void ustctl_destroy_stream(struct ustctl_consumer_stream *stream);
 205
 206 /* For mmap mode, readable without "get" operation */
 207 int ustctl_get_mmap_len(struct ustctl_consumer_stream *stream,
 208                 unsigned long *len);
 209 int ustctl_get_max_subbuf_size(struct ustctl_consumer_stream *stream,
 210                 unsigned long *len);
 211
 212 /*
 213  * For mmap mode, operate on the current packet (between get/put or
 214  * get_next/put_next).
 215  */
 216 void *ustctl_get_mmap_base(struct ustctl_consumer_stream *stream);
 217 int ustctl_get_mmap_read_offset(struct ustctl_consumer_stream *stream,
 218                 unsigned long *off);
 219 int ustctl_get_subbuf_size(struct ustctl_consumer_stream *stream,
 220                 unsigned long *len);
 221 int ustctl_get_padded_subbuf_size(struct ustctl_consumer_stream *stream,
 222                 unsigned long *len);
 223 int ustctl_get_next_subbuf(struct ustctl_consumer_stream *stream);
 224 int ustctl_put_next_subbuf(struct ustctl_consumer_stream *stream);
 225
 226 /* snapshot */
 227
 228 int ustctl_snapshot(struct ustctl_consumer_stream *stream);
 229 int ustctl_snapshot_get_consumed(struct ustctl_consumer_stream *stream,
 230                 unsigned long *pos);
 231 int ustctl_snapshot_get_produced(struct ustctl_consumer_stream *stream,
 232                 unsigned long *pos);
 233 int ustctl_get_subbuf(struct ustctl_consumer_stream *stream,
 234                 unsigned long *pos);
 235 int ustctl_put_subbuf(struct ustctl_consumer_stream *stream);
 236
 237 void ustctl_flush_buffer(struct ustctl_consumer_stream *stream,
 238                 int producer_active);
 239
 240 /* index */
 241 int ustctl_get_timestamp_begin(struct ustctl_consumer_stream *stream,
 242                 uint64_t *timestamp_begin);
 243 int ustctl_get_timestamp_end(struct ustctl_consumer_stream *stream,
 244         uint64_t *timestamp_end);
 245 int ustctl_get_events_discarded(struct ustctl_consumer_stream *stream,
 246         uint64_t *events_discarded);
 247 int ustctl_get_content_size(struct ustctl_consumer_stream *stream,
 248         uint64_t *content_size);
 249 int ustctl_get_packet_size(struct ustctl_consumer_stream *stream,
 250         uint64_t *packet_size);
 251 int ustctl_get_stream_id(struct ustctl_consumer_stream *stream,
 252                 uint64_t *stream_id);
 253 int ustctl_get_current_timestamp(struct ustctl_consumer_stream *stream,
 254                 uint64_t *ts);
 255 int ustctl_get_sequence_number(struct ustctl_consumer_stream *stream,
 256                 uint64_t *seq);
 257
 258 /* returns whether UST has perf counters support. */
 259 int ustctl_has_perf_counters(void);
 260
 261 /* event registry management */
 262
 263 enum ustctl_socket_type {
 264         USTCTL_SOCKET_CMD = 0,
 265         USTCTL_SOCKET_NOTIFY = 1,
 266 };
 267
 268 enum ustctl_notify_cmd {
 269         USTCTL_NOTIFY_CMD_EVENT = 0,
 270         USTCTL_NOTIFY_CMD_CHANNEL = 1,
 271         USTCTL_NOTIFY_CMD_ENUM = 2,
 272 };
 273
 274 enum ustctl_channel_header {
 275         USTCTL_CHANNEL_HEADER_UNKNOWN = 0,
 276         USTCTL_CHANNEL_HEADER_COMPACT = 1,
 277         USTCTL_CHANNEL_HEADER_LARGE = 2,
 278 };
 279
 280 /* event type structures */
 281
 282 enum ustctl_abstract_types {
 283         ustctl_atype_integer,
 284         ustctl_atype_enum,
 285         ustctl_atype_array,
 286         ustctl_atype_sequence,
 287         ustctl_atype_string,
 288         ustctl_atype_float,
 289         ustctl_atype_variant,
 290         ustctl_atype_struct,
 291         NR_USTCTL_ABSTRACT_TYPES,
 292 };
 293
 294 enum ustctl_string_encodings {
 295         ustctl_encode_none = 0,
 296         ustctl_encode_UTF8 = 1,
 297         ustctl_encode_ASCII = 2,
 298         NR_USTCTL_STRING_ENCODINGS,
 299 };
 300
 301 #define USTCTL_UST_INTEGER_TYPE_PADDING 24
 302 struct ustctl_integer_type {
 303         uint32_t size;          /* in bits */
 304         uint32_t signedness;
 305         uint32_t reverse_byte_order;
 306         uint32_t base;          /* 2, 8, 10, 16, for pretty print */
 307         enum ustctl_string_encodings encoding;
 308         uint16_t alignment;     /* in bits */
 309         char padding[USTCTL_UST_INTEGER_TYPE_PADDING];
 310 } LTTNG_PACKED;
 311
 312 #define USTCTL_UST_FLOAT_TYPE_PADDING   24
 313 struct ustctl_float_type {
 314         uint32_t exp_dig;               /* exponent digits, in bits */
 315         uint32_t mant_dig;              /* mantissa digits, in bits */
 316         uint32_t reverse_byte_order;
 317         uint16_t alignment;     /* in bits */
 318         char padding[USTCTL_UST_FLOAT_TYPE_PADDING];
 319 } LTTNG_PACKED;
 320
 321 #define USTCTL_UST_ENUM_ENTRY_PADDING   32
 322 struct ustctl_enum_entry {
 323         uint64_t start, end;            /* start and end are inclusive */
 324         char string[LTTNG_UST_SYM_NAME_LEN];
 325         char padding[USTCTL_UST_ENUM_ENTRY_PADDING];
 326 };
 327
 328 #define USTCTL_UST_BASIC_TYPE_PADDING   296
 329 union _ustctl_basic_type {
 330         struct ustctl_integer_type integer;
 331         struct {
 332                 char name[LTTNG_UST_SYM_NAME_LEN];
 333                 struct ustctl_integer_type container_type;
 334                 uint64_t id;    /* enum ID in sessiond. */
 335         } enumeration;
 336         struct {
 337                 enum ustctl_string_encodings encoding;
 338         } string;
 339         struct ustctl_float_type _float;
 340         char padding[USTCTL_UST_BASIC_TYPE_PADDING];
 341 } LTTNG_PACKED;
 342
 343 struct ustctl_basic_type {
 344         enum ustctl_abstract_types atype;
 345         union {
 346                 union _ustctl_basic_type basic;
 347         } u;
 348 } LTTNG_PACKED;
 349
 350 #define USTCTL_UST_TYPE_PADDING 128
 351 struct ustctl_type {
 352         enum ustctl_abstract_types atype;
 353         union {
 354                 union _ustctl_basic_type basic;
 355                 struct {
 356                         struct ustctl_basic_type elem_type;
 357                         uint32_t length;                /* num. elems. */
 358                 } array;
 359                 struct {
 360                         struct ustctl_basic_type length_type;
 361                         struct ustctl_basic_type elem_type;
 362                 } sequence;
 363                 struct {
 364                         uint32_t nr_choices;
 365                         char tag_name[LTTNG_UST_SYM_NAME_LEN];
 366                         /* Followed by nr_choices struct ustctl_field. */
 367                 } variant;
 368                 struct {
 369                         uint32_t nr_fields;
 370                         /* Followed by nr_fields struct ustctl_field. */
 371                 } _struct;
 372                 char padding[USTCTL_UST_TYPE_PADDING];
 373         } u;
 374 } LTTNG_PACKED;
 375
 376 #define USTCTL_UST_FIELD_PADDING        28
 377 struct ustctl_field {
 378         char name[LTTNG_UST_SYM_NAME_LEN];
 379         struct ustctl_type type;
 380         char padding[USTCTL_UST_FIELD_PADDING];
 381 } LTTNG_PACKED;
 382
 383 /*
 384  * Returns 0 on success, negative error value on error.
 385  * If an error other than -LTTNG_UST_ERR_UNSUP_MAJOR is returned,
 386  * the output fields are not populated.
 387  */
 388 int ustctl_recv_reg_msg(int sock,
 389         enum ustctl_socket_type *type,
 390         uint32_t *major,
 391         uint32_t *minor,
 392         uint32_t *pid,
 393         uint32_t *ppid,
 394         uint32_t *uid,
 395         uint32_t *gid,
 396         uint32_t *bits_per_long,
 397         uint32_t *uint8_t_alignment,
 398         uint32_t *uint16_t_alignment,
 399         uint32_t *uint32_t_alignment,
 400         uint32_t *uint64_t_alignment,
 401         uint32_t *long_alignment,
 402         int *byte_order,
 403         char *name);    /* size LTTNG_UST_ABI_PROCNAME_LEN */
 404
 405 /*
 406  * Returns 0 on success, negative UST or system error value on error.
 407  * Receive the notification command. The "notify_cmd" can then be used
 408  * by the caller to find out which ustctl_recv_* function should be
 409  * called to receive the notification, and which ustctl_reply_* is
 410  * appropriate.
 411  */
 412 int ustctl_recv_notify(int sock, enum ustctl_notify_cmd *notify_cmd);
 413
 414 /*
 415  * Returns 0 on success, negative UST or system error value on error.
 416  */
 417 int ustctl_recv_register_event(int sock,
 418         int *session_objd,              /* session descriptor (output) */
 419         int *channel_objd,              /* channel descriptor (output) */
 420         char *event_name,               /*
 421                                          * event name (output,
 422                                          * size LTTNG_UST_SYM_NAME_LEN)
 423                                          */
 424         int *loglevel,
 425         char **signature,               /*
 426                                          * event signature
 427                                          * (output, dynamically
 428                                          * allocated, must be free(3)'d
 429                                          * by the caller if function
 430                                          * returns success.)
 431                                          */
 432         size_t *nr_fields,
 433         struct ustctl_field **fields,
 434         char **model_emf_uri);
 435
 436 /*
 437  * Returns 0 on success, negative error value on error.
 438  */
 439 int ustctl_reply_register_event(int sock,
 440         uint32_t id,                    /* event id (input) */
 441         int ret_code);                  /* return code. 0 ok, negative error */
 442
 443 /*
 444  * Returns 0 on success, negative UST or system error value on error.
 445  */
 446 int ustctl_recv_register_enum(int sock,
 447         int *session_objd,
 448         char *enum_name,
 449         struct ustctl_enum_entry **entries,
 450         size_t *nr_entries);
 451
 452 /*
 453  * Returns 0 on success, negative error value on error.
 454  */
 455 int ustctl_reply_register_enum(int sock,
 456         uint64_t id,                    /* enum id (input) */
 457         int ret_code);
 458
 459 /*
 460  * Returns 0 on success, negative UST or system error value on error.
 461  */
 462 int ustctl_recv_register_channel(int sock,
 463         int *session_objd,              /* session descriptor (output) */
 464         int *channel_objd,              /* channel descriptor (output) */
 465         size_t *nr_fields,              /* context fields */
 466         struct ustctl_field **fields);
 467
 468 /*
 469  * Returns 0 on success, negative error value on error.
 470  */
 471 int ustctl_reply_register_channel(int sock,
 472         uint32_t chan_id,
 473         enum ustctl_channel_header header_type,
 474         int ret_code);                  /* return code. 0 ok, negative error */
 475
 476 #endif /* _LTTNG_UST_CTL_H */