| 1 | /* |
| 2 | * Copyright (C) 2019 Simon Marchi <simon.marchi@efficios.com> |
| 3 | * |
| 4 | * SPDX-License-Identifier: LGPL-2.1-only |
| 5 | * |
| 6 | */ |
| 7 | |
| 8 | #include <common/error.hpp> |
| 9 | #include <common/macros.hpp> |
| 10 | #include <common/mi-lttng.hpp> |
| 11 | #include <common/payload-view.hpp> |
| 12 | #include <common/payload.hpp> |
| 13 | #include <common/snapshot.hpp> |
| 14 | #include <inttypes.h> |
| 15 | #include <lttng/action/action-internal.hpp> |
| 16 | #include <lttng/action/rate-policy-internal.hpp> |
| 17 | #include <lttng/action/rate-policy.h> |
| 18 | #include <lttng/action/snapshot-session-internal.hpp> |
| 19 | #include <lttng/action/snapshot-session.h> |
| 20 | #include <lttng/snapshot-internal.hpp> |
| 21 | #include <lttng/snapshot.h> |
| 22 | |
| 23 | #define IS_SNAPSHOT_SESSION_ACTION(action) \ |
| 24 | (lttng_action_get_type(action) == LTTNG_ACTION_TYPE_SNAPSHOT_SESSION) |
| 25 | |
| 26 | struct lttng_action_snapshot_session { |
| 27 | struct lttng_action parent; |
| 28 | |
| 29 | /* Owned by this. */ |
| 30 | char *session_name; |
| 31 | |
| 32 | /* |
| 33 | * When non-NULL, use this custom output when taking the snapshot, |
| 34 | * rather than the session's registered snapshot output. |
| 35 | * |
| 36 | * Owned by this. |
| 37 | */ |
| 38 | struct lttng_snapshot_output *output; |
| 39 | struct lttng_rate_policy *policy; |
| 40 | }; |
| 41 | |
| 42 | struct lttng_action_snapshot_session_comm { |
| 43 | /* All string lengths include the trailing \0. */ |
| 44 | uint32_t session_name_len; |
| 45 | uint32_t snapshot_output_len; |
| 46 | uint32_t rate_policy_len; |
| 47 | |
| 48 | /* |
| 49 | * Variable data (all strings are null-terminated): |
| 50 | * |
| 51 | * - session name string |
| 52 | * - snapshot output object |
| 53 | * - policy object |
| 54 | */ |
| 55 | char data[]; |
| 56 | } LTTNG_PACKED; |
| 57 | |
| 58 | static const struct lttng_rate_policy * |
| 59 | lttng_action_snapshot_session_internal_get_rate_policy( |
| 60 | const struct lttng_action *action); |
| 61 | |
| 62 | static struct lttng_action_snapshot_session * |
| 63 | action_snapshot_session_from_action(struct lttng_action *action) |
| 64 | { |
| 65 | LTTNG_ASSERT(action); |
| 66 | |
| 67 | return container_of( |
| 68 | action, struct lttng_action_snapshot_session, parent); |
| 69 | } |
| 70 | |
| 71 | static const struct lttng_action_snapshot_session * |
| 72 | action_snapshot_session_from_action_const(const struct lttng_action *action) |
| 73 | { |
| 74 | LTTNG_ASSERT(action); |
| 75 | |
| 76 | return container_of( |
| 77 | action, struct lttng_action_snapshot_session, parent); |
| 78 | } |
| 79 | |
| 80 | static bool lttng_action_snapshot_session_validate(struct lttng_action *action) |
| 81 | { |
| 82 | bool valid = false; |
| 83 | struct lttng_action_snapshot_session *action_snapshot_session; |
| 84 | |
| 85 | if (!action) { |
| 86 | goto end; |
| 87 | } |
| 88 | |
| 89 | action_snapshot_session = action_snapshot_session_from_action(action); |
| 90 | |
| 91 | /* A non-empty session name is mandatory. */ |
| 92 | if (!action_snapshot_session->session_name || |
| 93 | strlen(action_snapshot_session->session_name) == 0) { |
| 94 | goto end; |
| 95 | } |
| 96 | |
| 97 | if (action_snapshot_session->output && |
| 98 | !lttng_snapshot_output_validate(action_snapshot_session->output)) { |
| 99 | goto end; |
| 100 | } |
| 101 | |
| 102 | valid = true; |
| 103 | end: |
| 104 | return valid; |
| 105 | } |
| 106 | |
| 107 | static bool lttng_action_snapshot_session_is_equal( |
| 108 | const struct lttng_action *_a, const struct lttng_action *_b) |
| 109 | { |
| 110 | bool is_equal = false; |
| 111 | const struct lttng_action_snapshot_session *a, *b; |
| 112 | |
| 113 | a = action_snapshot_session_from_action_const(_a); |
| 114 | b = action_snapshot_session_from_action_const(_b); |
| 115 | |
| 116 | /* Action is not valid if this is not true. */ |
| 117 | LTTNG_ASSERT(a->session_name); |
| 118 | LTTNG_ASSERT(b->session_name); |
| 119 | if (strcmp(a->session_name, b->session_name)) { |
| 120 | goto end; |
| 121 | } |
| 122 | |
| 123 | if (a->output && b->output && |
| 124 | !lttng_snapshot_output_is_equal(a->output, b->output)) { |
| 125 | goto end; |
| 126 | } else if (!!a->output != !!b->output) { |
| 127 | goto end; |
| 128 | } |
| 129 | |
| 130 | is_equal = lttng_rate_policy_is_equal(a->policy, b->policy); |
| 131 | end: |
| 132 | return is_equal; |
| 133 | } |
| 134 | |
| 135 | static size_t serialize_strlen(const char *str) |
| 136 | { |
| 137 | return str ? strlen(str) + 1 : 0; |
| 138 | } |
| 139 | |
| 140 | static int lttng_action_snapshot_session_serialize( |
| 141 | struct lttng_action *action, struct lttng_payload *payload) |
| 142 | { |
| 143 | struct lttng_action_snapshot_session *action_snapshot_session; |
| 144 | struct lttng_action_snapshot_session_comm comm = {}; |
| 145 | int ret; |
| 146 | size_t size_before_comm; |
| 147 | |
| 148 | LTTNG_ASSERT(action); |
| 149 | LTTNG_ASSERT(payload); |
| 150 | |
| 151 | size_before_comm = payload->buffer.size; |
| 152 | |
| 153 | action_snapshot_session = action_snapshot_session_from_action(action); |
| 154 | comm.session_name_len = |
| 155 | serialize_strlen(action_snapshot_session->session_name); |
| 156 | |
| 157 | /* Add header. */ |
| 158 | ret = lttng_dynamic_buffer_append( |
| 159 | &payload->buffer, &comm, sizeof(comm)); |
| 160 | if (ret) { |
| 161 | goto end; |
| 162 | } |
| 163 | |
| 164 | LTTNG_ASSERT(action_snapshot_session->session_name); |
| 165 | DBG("Serializing snapshot session action: session-name: %s", |
| 166 | action_snapshot_session->session_name); |
| 167 | |
| 168 | /* Add session name. */ |
| 169 | ret = lttng_dynamic_buffer_append(&payload->buffer, |
| 170 | action_snapshot_session->session_name, |
| 171 | comm.session_name_len); |
| 172 | if (ret) { |
| 173 | goto end; |
| 174 | } |
| 175 | |
| 176 | /* Serialize the snapshot output object, if any. */ |
| 177 | if (action_snapshot_session->output) { |
| 178 | const size_t size_before_output = payload->buffer.size; |
| 179 | struct lttng_action_snapshot_session_comm *comm_in_payload; |
| 180 | |
| 181 | ret = lttng_snapshot_output_serialize( |
| 182 | action_snapshot_session->output, |
| 183 | payload); |
| 184 | if (ret) { |
| 185 | goto end; |
| 186 | } |
| 187 | |
| 188 | comm_in_payload = (typeof(comm_in_payload))( |
| 189 | payload->buffer.data + size_before_comm); |
| 190 | /* Adjust action length in header. */ |
| 191 | comm_in_payload->snapshot_output_len = |
| 192 | payload->buffer.size - size_before_output; |
| 193 | } |
| 194 | |
| 195 | /* Serialize the rate policy. */ |
| 196 | { |
| 197 | const size_t size_before_output = payload->buffer.size; |
| 198 | struct lttng_action_snapshot_session_comm *comm_in_payload; |
| 199 | |
| 200 | ret = lttng_rate_policy_serialize( |
| 201 | action_snapshot_session->policy, payload); |
| 202 | if (ret) { |
| 203 | ret = -1; |
| 204 | goto end; |
| 205 | } |
| 206 | |
| 207 | comm_in_payload = (typeof(comm_in_payload))( |
| 208 | payload->buffer.data + size_before_comm); |
| 209 | /* Adjust rate policy length in header. */ |
| 210 | comm_in_payload->rate_policy_len = |
| 211 | payload->buffer.size - size_before_output; |
| 212 | } |
| 213 | |
| 214 | end: |
| 215 | return ret; |
| 216 | } |
| 217 | |
| 218 | static void lttng_action_snapshot_session_destroy(struct lttng_action *action) |
| 219 | { |
| 220 | struct lttng_action_snapshot_session *action_snapshot_session; |
| 221 | |
| 222 | if (!action) { |
| 223 | goto end; |
| 224 | } |
| 225 | |
| 226 | action_snapshot_session = action_snapshot_session_from_action(action); |
| 227 | |
| 228 | free(action_snapshot_session->session_name); |
| 229 | lttng_snapshot_output_destroy(action_snapshot_session->output); |
| 230 | lttng_rate_policy_destroy(action_snapshot_session->policy); |
| 231 | free(action_snapshot_session); |
| 232 | |
| 233 | end: |
| 234 | return; |
| 235 | } |
| 236 | |
| 237 | ssize_t lttng_action_snapshot_session_create_from_payload( |
| 238 | struct lttng_payload_view *view, |
| 239 | struct lttng_action **p_action) |
| 240 | { |
| 241 | ssize_t consumed_len; |
| 242 | const char *variable_data; |
| 243 | struct lttng_action *action; |
| 244 | enum lttng_action_status status; |
| 245 | struct lttng_snapshot_output *snapshot_output = NULL; |
| 246 | struct lttng_rate_policy *policy = NULL; |
| 247 | const struct lttng_action_snapshot_session_comm *comm; |
| 248 | const struct lttng_payload_view snapshot_session_comm_view = |
| 249 | lttng_payload_view_from_view( |
| 250 | view, 0, sizeof(*comm)); |
| 251 | |
| 252 | action = lttng_action_snapshot_session_create(); |
| 253 | if (!action) { |
| 254 | goto error; |
| 255 | } |
| 256 | |
| 257 | if (!lttng_payload_view_is_valid(&snapshot_session_comm_view)) { |
| 258 | /* Payload not large enough to contain the header. */ |
| 259 | goto error; |
| 260 | } |
| 261 | |
| 262 | comm = (typeof(comm)) snapshot_session_comm_view.buffer.data; |
| 263 | variable_data = (const char *) &comm->data; |
| 264 | |
| 265 | consumed_len = sizeof(struct lttng_action_snapshot_session_comm); |
| 266 | |
| 267 | if (!lttng_buffer_view_contains_string( |
| 268 | &view->buffer, variable_data, comm->session_name_len)) { |
| 269 | goto error; |
| 270 | } |
| 271 | |
| 272 | status = lttng_action_snapshot_session_set_session_name( |
| 273 | action, variable_data); |
| 274 | if (status != LTTNG_ACTION_STATUS_OK) { |
| 275 | goto error; |
| 276 | } |
| 277 | |
| 278 | variable_data += comm->session_name_len; |
| 279 | consumed_len += comm->session_name_len; |
| 280 | |
| 281 | /* If there is a snapshot output object, deserialize it. */ |
| 282 | if (comm->snapshot_output_len > 0) { |
| 283 | ssize_t snapshot_output_consumed_len; |
| 284 | enum lttng_action_status action_status; |
| 285 | struct lttng_payload_view snapshot_output_buffer_view = |
| 286 | lttng_payload_view_from_view(view, consumed_len, |
| 287 | comm->snapshot_output_len); |
| 288 | |
| 289 | if (!lttng_payload_view_is_valid(&snapshot_output_buffer_view)) { |
| 290 | ERR("Failed to create buffer view for snapshot output."); |
| 291 | goto error; |
| 292 | } |
| 293 | |
| 294 | snapshot_output_consumed_len = |
| 295 | lttng_snapshot_output_create_from_payload( |
| 296 | &snapshot_output_buffer_view, |
| 297 | &snapshot_output); |
| 298 | if (snapshot_output_consumed_len != comm->snapshot_output_len) { |
| 299 | ERR("Failed to deserialize snapshot output object: " |
| 300 | "consumed-len: %zd, expected-len: %" PRIu32, |
| 301 | snapshot_output_consumed_len, |
| 302 | comm->snapshot_output_len); |
| 303 | goto error; |
| 304 | } |
| 305 | |
| 306 | action_status = lttng_action_snapshot_session_set_output( |
| 307 | action, snapshot_output); |
| 308 | if (action_status != LTTNG_ACTION_STATUS_OK) { |
| 309 | goto error; |
| 310 | } |
| 311 | |
| 312 | /* Ownership has been transferred to the action. */ |
| 313 | snapshot_output = NULL; |
| 314 | } |
| 315 | |
| 316 | variable_data += comm->snapshot_output_len; |
| 317 | consumed_len += comm->snapshot_output_len; |
| 318 | |
| 319 | /* Rate policy. */ |
| 320 | if (comm->rate_policy_len <= 0) { |
| 321 | ERR("Rate policy should be present."); |
| 322 | goto error; |
| 323 | } |
| 324 | { |
| 325 | ssize_t rate_policy_consumed_len; |
| 326 | struct lttng_payload_view policy_view = |
| 327 | lttng_payload_view_from_view(view, consumed_len, |
| 328 | comm->rate_policy_len); |
| 329 | |
| 330 | if (!lttng_payload_view_is_valid(&policy_view)) { |
| 331 | ERR("Failed to create buffer view for rate policy."); |
| 332 | goto error; |
| 333 | } |
| 334 | |
| 335 | rate_policy_consumed_len = |
| 336 | lttng_rate_policy_create_from_payload( |
| 337 | &policy_view, &policy); |
| 338 | if (rate_policy_consumed_len < 0) { |
| 339 | goto error; |
| 340 | } |
| 341 | |
| 342 | if (rate_policy_consumed_len != comm->rate_policy_len) { |
| 343 | ERR("Failed to deserialize rate policy object: " |
| 344 | "consumed-len: %zd, expected-len: %" PRIu32, |
| 345 | rate_policy_consumed_len, |
| 346 | comm->rate_policy_len); |
| 347 | goto error; |
| 348 | } |
| 349 | |
| 350 | status = lttng_action_snapshot_session_set_rate_policy( |
| 351 | action, policy); |
| 352 | if (status != LTTNG_ACTION_STATUS_OK) { |
| 353 | goto error; |
| 354 | } |
| 355 | } |
| 356 | |
| 357 | variable_data += comm->rate_policy_len; |
| 358 | consumed_len += comm->rate_policy_len; |
| 359 | |
| 360 | *p_action = action; |
| 361 | action = NULL; |
| 362 | |
| 363 | goto end; |
| 364 | |
| 365 | error: |
| 366 | consumed_len = -1; |
| 367 | |
| 368 | end: |
| 369 | lttng_rate_policy_destroy(policy); |
| 370 | lttng_action_snapshot_session_destroy(action); |
| 371 | lttng_snapshot_output_destroy(snapshot_output); |
| 372 | |
| 373 | return consumed_len; |
| 374 | } |
| 375 | |
| 376 | static enum lttng_error_code lttng_action_snapshot_session_mi_serialize( |
| 377 | const struct lttng_action *action, struct mi_writer *writer) |
| 378 | { |
| 379 | int ret; |
| 380 | enum lttng_error_code ret_code; |
| 381 | enum lttng_action_status status; |
| 382 | const char *session_name = NULL; |
| 383 | const struct lttng_snapshot_output *output = NULL; |
| 384 | const struct lttng_rate_policy *policy = NULL; |
| 385 | |
| 386 | LTTNG_ASSERT(action); |
| 387 | LTTNG_ASSERT(IS_SNAPSHOT_SESSION_ACTION(action)); |
| 388 | |
| 389 | status = lttng_action_snapshot_session_get_session_name( |
| 390 | action, &session_name); |
| 391 | LTTNG_ASSERT(status == LTTNG_ACTION_STATUS_OK); |
| 392 | LTTNG_ASSERT(session_name != NULL); |
| 393 | |
| 394 | status = lttng_action_snapshot_session_get_rate_policy(action, &policy); |
| 395 | LTTNG_ASSERT(status == LTTNG_ACTION_STATUS_OK); |
| 396 | LTTNG_ASSERT(policy != NULL); |
| 397 | |
| 398 | /* Open action snapshot session element. */ |
| 399 | ret = mi_lttng_writer_open_element( |
| 400 | writer, mi_lttng_element_action_snapshot_session); |
| 401 | if (ret) { |
| 402 | goto mi_error; |
| 403 | } |
| 404 | |
| 405 | /* Session name. */ |
| 406 | ret = mi_lttng_writer_write_element_string( |
| 407 | writer, mi_lttng_element_session_name, session_name); |
| 408 | if (ret) { |
| 409 | goto mi_error; |
| 410 | } |
| 411 | |
| 412 | /* Output if any. */ |
| 413 | status = lttng_action_snapshot_session_get_output(action, &output); |
| 414 | if (status == LTTNG_ACTION_STATUS_OK) { |
| 415 | LTTNG_ASSERT(output != NULL); |
| 416 | ret_code = lttng_snapshot_output_mi_serialize(output, writer); |
| 417 | if (ret_code != LTTNG_OK) { |
| 418 | goto end; |
| 419 | } |
| 420 | } else if (status != LTTNG_ACTION_STATUS_UNSET) { |
| 421 | /* This should not happen at this point. */ |
| 422 | abort(); |
| 423 | } |
| 424 | |
| 425 | /* Rate policy. */ |
| 426 | ret_code = lttng_rate_policy_mi_serialize(policy, writer); |
| 427 | if (ret_code != LTTNG_OK) { |
| 428 | goto end; |
| 429 | } |
| 430 | |
| 431 | /* Close action_snapshot_session element. */ |
| 432 | ret = mi_lttng_writer_close_element(writer); |
| 433 | if (ret) { |
| 434 | goto mi_error; |
| 435 | } |
| 436 | |
| 437 | ret_code = LTTNG_OK; |
| 438 | goto end; |
| 439 | |
| 440 | mi_error: |
| 441 | ret_code = LTTNG_ERR_MI_IO_FAIL; |
| 442 | end: |
| 443 | return ret_code; |
| 444 | } |
| 445 | |
| 446 | struct lttng_action *lttng_action_snapshot_session_create(void) |
| 447 | { |
| 448 | struct lttng_action_snapshot_session *action_snapshot = NULL; |
| 449 | struct lttng_rate_policy *policy = NULL; |
| 450 | enum lttng_action_status status; |
| 451 | |
| 452 | /* Create a every N = 1 rate policy. */ |
| 453 | policy = lttng_rate_policy_every_n_create(1); |
| 454 | if (!policy) { |
| 455 | goto end; |
| 456 | } |
| 457 | |
| 458 | action_snapshot = zmalloc<lttng_action_snapshot_session>(); |
| 459 | if (!action_snapshot) { |
| 460 | goto end; |
| 461 | } |
| 462 | |
| 463 | lttng_action_init(&action_snapshot->parent, |
| 464 | LTTNG_ACTION_TYPE_SNAPSHOT_SESSION, |
| 465 | lttng_action_snapshot_session_validate, |
| 466 | lttng_action_snapshot_session_serialize, |
| 467 | lttng_action_snapshot_session_is_equal, |
| 468 | lttng_action_snapshot_session_destroy, |
| 469 | lttng_action_snapshot_session_internal_get_rate_policy, |
| 470 | lttng_action_generic_add_error_query_results, |
| 471 | lttng_action_snapshot_session_mi_serialize); |
| 472 | |
| 473 | status = lttng_action_snapshot_session_set_rate_policy( |
| 474 | &action_snapshot->parent, policy); |
| 475 | if (status != LTTNG_ACTION_STATUS_OK) { |
| 476 | lttng_action_destroy(&action_snapshot->parent); |
| 477 | action_snapshot = NULL; |
| 478 | goto end; |
| 479 | } |
| 480 | |
| 481 | end: |
| 482 | lttng_rate_policy_destroy(policy); |
| 483 | return action_snapshot ? &action_snapshot->parent : nullptr; |
| 484 | } |
| 485 | |
| 486 | enum lttng_action_status lttng_action_snapshot_session_set_session_name( |
| 487 | struct lttng_action *action, const char *session_name) |
| 488 | { |
| 489 | struct lttng_action_snapshot_session *action_snapshot_session; |
| 490 | enum lttng_action_status status; |
| 491 | |
| 492 | if (!action || !IS_SNAPSHOT_SESSION_ACTION(action) || !session_name || |
| 493 | strlen(session_name) == 0) { |
| 494 | status = LTTNG_ACTION_STATUS_INVALID; |
| 495 | goto end; |
| 496 | } |
| 497 | |
| 498 | action_snapshot_session = action_snapshot_session_from_action(action); |
| 499 | |
| 500 | free(action_snapshot_session->session_name); |
| 501 | |
| 502 | action_snapshot_session->session_name = strdup(session_name); |
| 503 | if (!action_snapshot_session->session_name) { |
| 504 | status = LTTNG_ACTION_STATUS_ERROR; |
| 505 | goto end; |
| 506 | } |
| 507 | |
| 508 | status = LTTNG_ACTION_STATUS_OK; |
| 509 | end: |
| 510 | return status; |
| 511 | } |
| 512 | |
| 513 | enum lttng_action_status lttng_action_snapshot_session_get_session_name( |
| 514 | const struct lttng_action *action, const char **session_name) |
| 515 | { |
| 516 | const struct lttng_action_snapshot_session *action_snapshot_session; |
| 517 | enum lttng_action_status status; |
| 518 | |
| 519 | if (!action || !IS_SNAPSHOT_SESSION_ACTION(action) || !session_name) { |
| 520 | status = LTTNG_ACTION_STATUS_INVALID; |
| 521 | goto end; |
| 522 | } |
| 523 | |
| 524 | action_snapshot_session = action_snapshot_session_from_action_const(action); |
| 525 | |
| 526 | if (action_snapshot_session->session_name) { |
| 527 | *session_name = action_snapshot_session->session_name; |
| 528 | status = LTTNG_ACTION_STATUS_OK; |
| 529 | } else { |
| 530 | status = LTTNG_ACTION_STATUS_UNSET; |
| 531 | } |
| 532 | |
| 533 | end: |
| 534 | |
| 535 | return status; |
| 536 | } |
| 537 | |
| 538 | enum lttng_action_status lttng_action_snapshot_session_set_output( |
| 539 | struct lttng_action *action, |
| 540 | struct lttng_snapshot_output *output) |
| 541 | { |
| 542 | struct lttng_action_snapshot_session *action_snapshot_session; |
| 543 | enum lttng_action_status status; |
| 544 | |
| 545 | if (!action || !IS_SNAPSHOT_SESSION_ACTION(action) || !output) { |
| 546 | status = LTTNG_ACTION_STATUS_INVALID; |
| 547 | goto end; |
| 548 | } |
| 549 | |
| 550 | action_snapshot_session = action_snapshot_session_from_action(action); |
| 551 | |
| 552 | lttng_snapshot_output_destroy(action_snapshot_session->output); |
| 553 | action_snapshot_session->output = output; |
| 554 | |
| 555 | status = LTTNG_ACTION_STATUS_OK; |
| 556 | |
| 557 | end: |
| 558 | return status; |
| 559 | } |
| 560 | |
| 561 | enum lttng_action_status lttng_action_snapshot_session_get_output( |
| 562 | const struct lttng_action *action, |
| 563 | const struct lttng_snapshot_output **output) |
| 564 | { |
| 565 | const struct lttng_action_snapshot_session *action_snapshot_session; |
| 566 | enum lttng_action_status status; |
| 567 | |
| 568 | if (!action || !IS_SNAPSHOT_SESSION_ACTION(action)|| !output) { |
| 569 | status = LTTNG_ACTION_STATUS_INVALID; |
| 570 | goto end; |
| 571 | } |
| 572 | |
| 573 | action_snapshot_session = action_snapshot_session_from_action_const(action); |
| 574 | |
| 575 | if (action_snapshot_session->output) { |
| 576 | *output = action_snapshot_session->output; |
| 577 | status = LTTNG_ACTION_STATUS_OK; |
| 578 | } else { |
| 579 | status = LTTNG_ACTION_STATUS_UNSET; |
| 580 | } |
| 581 | |
| 582 | end: |
| 583 | return status; |
| 584 | } |
| 585 | |
| 586 | enum lttng_action_status lttng_action_snapshot_session_set_rate_policy( |
| 587 | struct lttng_action *action, |
| 588 | const struct lttng_rate_policy *policy) |
| 589 | { |
| 590 | enum lttng_action_status status; |
| 591 | struct lttng_action_snapshot_session *snapshot_session_action; |
| 592 | struct lttng_rate_policy *copy = NULL; |
| 593 | |
| 594 | if (!action || !policy || !IS_SNAPSHOT_SESSION_ACTION(action)) { |
| 595 | status = LTTNG_ACTION_STATUS_INVALID; |
| 596 | goto end; |
| 597 | } |
| 598 | |
| 599 | copy = lttng_rate_policy_copy(policy); |
| 600 | if (!copy) { |
| 601 | status = LTTNG_ACTION_STATUS_ERROR; |
| 602 | goto end; |
| 603 | } |
| 604 | |
| 605 | snapshot_session_action = action_snapshot_session_from_action(action); |
| 606 | |
| 607 | /* Free the previous rate policy .*/ |
| 608 | lttng_rate_policy_destroy(snapshot_session_action->policy); |
| 609 | |
| 610 | /* Assign the policy. */ |
| 611 | snapshot_session_action->policy = copy; |
| 612 | status = LTTNG_ACTION_STATUS_OK; |
| 613 | copy = NULL; |
| 614 | |
| 615 | end: |
| 616 | lttng_rate_policy_destroy(copy); |
| 617 | return status; |
| 618 | } |
| 619 | |
| 620 | enum lttng_action_status lttng_action_snapshot_session_get_rate_policy( |
| 621 | const struct lttng_action *action, |
| 622 | const struct lttng_rate_policy **policy) |
| 623 | { |
| 624 | enum lttng_action_status status; |
| 625 | const struct lttng_action_snapshot_session *snapshot_session_action; |
| 626 | |
| 627 | if (!action || !policy || !IS_SNAPSHOT_SESSION_ACTION(action)) { |
| 628 | status = LTTNG_ACTION_STATUS_INVALID; |
| 629 | goto end; |
| 630 | } |
| 631 | |
| 632 | snapshot_session_action = |
| 633 | action_snapshot_session_from_action_const(action); |
| 634 | |
| 635 | *policy = snapshot_session_action->policy; |
| 636 | status = LTTNG_ACTION_STATUS_OK; |
| 637 | end: |
| 638 | return status; |
| 639 | } |
| 640 | |
| 641 | static const struct lttng_rate_policy * |
| 642 | lttng_action_snapshot_session_internal_get_rate_policy( |
| 643 | const struct lttng_action *action) |
| 644 | { |
| 645 | const struct lttng_action_snapshot_session *_action; |
| 646 | _action = action_snapshot_session_from_action_const(action); |
| 647 | |
| 648 | return _action->policy; |
| 649 | } |