| 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 | namespace { |
| 27 | struct lttng_action_snapshot_session { |
| 28 | struct lttng_action parent; |
| 29 | |
| 30 | /* Owned by this. */ |
| 31 | char *session_name; |
| 32 | |
| 33 | /* |
| 34 | * When non-NULL, use this custom output when taking the snapshot, |
| 35 | * rather than the session's registered snapshot output. |
| 36 | * |
| 37 | * Owned by this. |
| 38 | */ |
| 39 | struct lttng_snapshot_output *output; |
| 40 | struct lttng_rate_policy *policy; |
| 41 | }; |
| 42 | |
| 43 | struct lttng_action_snapshot_session_comm { |
| 44 | /* All string lengths include the trailing \0. */ |
| 45 | uint32_t session_name_len; |
| 46 | uint32_t snapshot_output_len; |
| 47 | uint32_t rate_policy_len; |
| 48 | |
| 49 | /* |
| 50 | * Variable data (all strings are null-terminated): |
| 51 | * |
| 52 | * - session name string |
| 53 | * - snapshot output object |
| 54 | * - policy object |
| 55 | */ |
| 56 | char data[]; |
| 57 | } LTTNG_PACKED; |
| 58 | } /* namespace */ |
| 59 | |
| 60 | static const struct lttng_rate_policy * |
| 61 | lttng_action_snapshot_session_internal_get_rate_policy( |
| 62 | const struct lttng_action *action); |
| 63 | |
| 64 | static struct lttng_action_snapshot_session * |
| 65 | action_snapshot_session_from_action(struct lttng_action *action) |
| 66 | { |
| 67 | LTTNG_ASSERT(action); |
| 68 | |
| 69 | return container_of( |
| 70 | action, struct lttng_action_snapshot_session, parent); |
| 71 | } |
| 72 | |
| 73 | static const struct lttng_action_snapshot_session * |
| 74 | action_snapshot_session_from_action_const(const struct lttng_action *action) |
| 75 | { |
| 76 | LTTNG_ASSERT(action); |
| 77 | |
| 78 | return container_of( |
| 79 | action, struct lttng_action_snapshot_session, parent); |
| 80 | } |
| 81 | |
| 82 | static bool lttng_action_snapshot_session_validate(struct lttng_action *action) |
| 83 | { |
| 84 | bool valid = false; |
| 85 | struct lttng_action_snapshot_session *action_snapshot_session; |
| 86 | |
| 87 | if (!action) { |
| 88 | goto end; |
| 89 | } |
| 90 | |
| 91 | action_snapshot_session = action_snapshot_session_from_action(action); |
| 92 | |
| 93 | /* A non-empty session name is mandatory. */ |
| 94 | if (!action_snapshot_session->session_name || |
| 95 | strlen(action_snapshot_session->session_name) == 0) { |
| 96 | goto end; |
| 97 | } |
| 98 | |
| 99 | if (action_snapshot_session->output && |
| 100 | !lttng_snapshot_output_validate(action_snapshot_session->output)) { |
| 101 | goto end; |
| 102 | } |
| 103 | |
| 104 | valid = true; |
| 105 | end: |
| 106 | return valid; |
| 107 | } |
| 108 | |
| 109 | static bool lttng_action_snapshot_session_is_equal( |
| 110 | const struct lttng_action *_a, const struct lttng_action *_b) |
| 111 | { |
| 112 | bool is_equal = false; |
| 113 | const struct lttng_action_snapshot_session *a, *b; |
| 114 | |
| 115 | a = action_snapshot_session_from_action_const(_a); |
| 116 | b = action_snapshot_session_from_action_const(_b); |
| 117 | |
| 118 | /* Action is not valid if this is not true. */ |
| 119 | LTTNG_ASSERT(a->session_name); |
| 120 | LTTNG_ASSERT(b->session_name); |
| 121 | if (strcmp(a->session_name, b->session_name)) { |
| 122 | goto end; |
| 123 | } |
| 124 | |
| 125 | if (a->output && b->output && |
| 126 | !lttng_snapshot_output_is_equal(a->output, b->output)) { |
| 127 | goto end; |
| 128 | } else if (!!a->output != !!b->output) { |
| 129 | goto end; |
| 130 | } |
| 131 | |
| 132 | is_equal = lttng_rate_policy_is_equal(a->policy, b->policy); |
| 133 | end: |
| 134 | return is_equal; |
| 135 | } |
| 136 | |
| 137 | static size_t serialize_strlen(const char *str) |
| 138 | { |
| 139 | return str ? strlen(str) + 1 : 0; |
| 140 | } |
| 141 | |
| 142 | static int lttng_action_snapshot_session_serialize( |
| 143 | struct lttng_action *action, struct lttng_payload *payload) |
| 144 | { |
| 145 | struct lttng_action_snapshot_session *action_snapshot_session; |
| 146 | struct lttng_action_snapshot_session_comm comm = {}; |
| 147 | int ret; |
| 148 | size_t size_before_comm; |
| 149 | |
| 150 | LTTNG_ASSERT(action); |
| 151 | LTTNG_ASSERT(payload); |
| 152 | |
| 153 | size_before_comm = payload->buffer.size; |
| 154 | |
| 155 | action_snapshot_session = action_snapshot_session_from_action(action); |
| 156 | comm.session_name_len = |
| 157 | serialize_strlen(action_snapshot_session->session_name); |
| 158 | |
| 159 | /* Add header. */ |
| 160 | ret = lttng_dynamic_buffer_append( |
| 161 | &payload->buffer, &comm, sizeof(comm)); |
| 162 | if (ret) { |
| 163 | goto end; |
| 164 | } |
| 165 | |
| 166 | LTTNG_ASSERT(action_snapshot_session->session_name); |
| 167 | DBG("Serializing snapshot session action: session-name: %s", |
| 168 | action_snapshot_session->session_name); |
| 169 | |
| 170 | /* Add session name. */ |
| 171 | ret = lttng_dynamic_buffer_append(&payload->buffer, |
| 172 | action_snapshot_session->session_name, |
| 173 | comm.session_name_len); |
| 174 | if (ret) { |
| 175 | goto end; |
| 176 | } |
| 177 | |
| 178 | /* Serialize the snapshot output object, if any. */ |
| 179 | if (action_snapshot_session->output) { |
| 180 | const size_t size_before_output = payload->buffer.size; |
| 181 | struct lttng_action_snapshot_session_comm *comm_in_payload; |
| 182 | |
| 183 | ret = lttng_snapshot_output_serialize( |
| 184 | action_snapshot_session->output, |
| 185 | payload); |
| 186 | if (ret) { |
| 187 | goto end; |
| 188 | } |
| 189 | |
| 190 | comm_in_payload = (typeof(comm_in_payload))( |
| 191 | payload->buffer.data + size_before_comm); |
| 192 | /* Adjust action length in header. */ |
| 193 | comm_in_payload->snapshot_output_len = |
| 194 | payload->buffer.size - size_before_output; |
| 195 | } |
| 196 | |
| 197 | /* Serialize the rate policy. */ |
| 198 | { |
| 199 | const size_t size_before_output = payload->buffer.size; |
| 200 | struct lttng_action_snapshot_session_comm *comm_in_payload; |
| 201 | |
| 202 | ret = lttng_rate_policy_serialize( |
| 203 | action_snapshot_session->policy, payload); |
| 204 | if (ret) { |
| 205 | ret = -1; |
| 206 | goto end; |
| 207 | } |
| 208 | |
| 209 | comm_in_payload = (typeof(comm_in_payload))( |
| 210 | payload->buffer.data + size_before_comm); |
| 211 | /* Adjust rate policy length in header. */ |
| 212 | comm_in_payload->rate_policy_len = |
| 213 | payload->buffer.size - size_before_output; |
| 214 | } |
| 215 | |
| 216 | end: |
| 217 | return ret; |
| 218 | } |
| 219 | |
| 220 | static void lttng_action_snapshot_session_destroy(struct lttng_action *action) |
| 221 | { |
| 222 | struct lttng_action_snapshot_session *action_snapshot_session; |
| 223 | |
| 224 | if (!action) { |
| 225 | goto end; |
| 226 | } |
| 227 | |
| 228 | action_snapshot_session = action_snapshot_session_from_action(action); |
| 229 | |
| 230 | free(action_snapshot_session->session_name); |
| 231 | lttng_snapshot_output_destroy(action_snapshot_session->output); |
| 232 | lttng_rate_policy_destroy(action_snapshot_session->policy); |
| 233 | free(action_snapshot_session); |
| 234 | |
| 235 | end: |
| 236 | return; |
| 237 | } |
| 238 | |
| 239 | ssize_t lttng_action_snapshot_session_create_from_payload( |
| 240 | struct lttng_payload_view *view, |
| 241 | struct lttng_action **p_action) |
| 242 | { |
| 243 | ssize_t consumed_len; |
| 244 | const char *variable_data; |
| 245 | struct lttng_action *action; |
| 246 | enum lttng_action_status status; |
| 247 | struct lttng_snapshot_output *snapshot_output = NULL; |
| 248 | struct lttng_rate_policy *policy = NULL; |
| 249 | const struct lttng_action_snapshot_session_comm *comm; |
| 250 | const struct lttng_payload_view snapshot_session_comm_view = |
| 251 | lttng_payload_view_from_view( |
| 252 | view, 0, sizeof(*comm)); |
| 253 | |
| 254 | action = lttng_action_snapshot_session_create(); |
| 255 | if (!action) { |
| 256 | goto error; |
| 257 | } |
| 258 | |
| 259 | if (!lttng_payload_view_is_valid(&snapshot_session_comm_view)) { |
| 260 | /* Payload not large enough to contain the header. */ |
| 261 | goto error; |
| 262 | } |
| 263 | |
| 264 | comm = (typeof(comm)) snapshot_session_comm_view.buffer.data; |
| 265 | variable_data = (const char *) &comm->data; |
| 266 | |
| 267 | consumed_len = sizeof(struct lttng_action_snapshot_session_comm); |
| 268 | |
| 269 | if (!lttng_buffer_view_contains_string( |
| 270 | &view->buffer, variable_data, comm->session_name_len)) { |
| 271 | goto error; |
| 272 | } |
| 273 | |
| 274 | status = lttng_action_snapshot_session_set_session_name( |
| 275 | action, variable_data); |
| 276 | if (status != LTTNG_ACTION_STATUS_OK) { |
| 277 | goto error; |
| 278 | } |
| 279 | |
| 280 | variable_data += comm->session_name_len; |
| 281 | consumed_len += comm->session_name_len; |
| 282 | |
| 283 | /* If there is a snapshot output object, deserialize it. */ |
| 284 | if (comm->snapshot_output_len > 0) { |
| 285 | ssize_t snapshot_output_consumed_len; |
| 286 | enum lttng_action_status action_status; |
| 287 | struct lttng_payload_view snapshot_output_buffer_view = |
| 288 | lttng_payload_view_from_view(view, consumed_len, |
| 289 | comm->snapshot_output_len); |
| 290 | |
| 291 | if (!lttng_payload_view_is_valid(&snapshot_output_buffer_view)) { |
| 292 | ERR("Failed to create buffer view for snapshot output."); |
| 293 | goto error; |
| 294 | } |
| 295 | |
| 296 | snapshot_output_consumed_len = |
| 297 | lttng_snapshot_output_create_from_payload( |
| 298 | &snapshot_output_buffer_view, |
| 299 | &snapshot_output); |
| 300 | if (snapshot_output_consumed_len != comm->snapshot_output_len) { |
| 301 | ERR("Failed to deserialize snapshot output object: " |
| 302 | "consumed-len: %zd, expected-len: %" PRIu32, |
| 303 | snapshot_output_consumed_len, |
| 304 | comm->snapshot_output_len); |
| 305 | goto error; |
| 306 | } |
| 307 | |
| 308 | action_status = lttng_action_snapshot_session_set_output( |
| 309 | action, snapshot_output); |
| 310 | if (action_status != LTTNG_ACTION_STATUS_OK) { |
| 311 | goto error; |
| 312 | } |
| 313 | |
| 314 | /* Ownership has been transferred to the action. */ |
| 315 | snapshot_output = NULL; |
| 316 | } |
| 317 | |
| 318 | variable_data += comm->snapshot_output_len; |
| 319 | consumed_len += comm->snapshot_output_len; |
| 320 | |
| 321 | /* Rate policy. */ |
| 322 | if (comm->rate_policy_len <= 0) { |
| 323 | ERR("Rate policy should be present."); |
| 324 | goto error; |
| 325 | } |
| 326 | { |
| 327 | ssize_t rate_policy_consumed_len; |
| 328 | struct lttng_payload_view policy_view = |
| 329 | lttng_payload_view_from_view(view, consumed_len, |
| 330 | comm->rate_policy_len); |
| 331 | |
| 332 | if (!lttng_payload_view_is_valid(&policy_view)) { |
| 333 | ERR("Failed to create buffer view for rate policy."); |
| 334 | goto error; |
| 335 | } |
| 336 | |
| 337 | rate_policy_consumed_len = |
| 338 | lttng_rate_policy_create_from_payload( |
| 339 | &policy_view, &policy); |
| 340 | if (rate_policy_consumed_len < 0) { |
| 341 | goto error; |
| 342 | } |
| 343 | |
| 344 | if (rate_policy_consumed_len != comm->rate_policy_len) { |
| 345 | ERR("Failed to deserialize rate policy object: " |
| 346 | "consumed-len: %zd, expected-len: %" PRIu32, |
| 347 | rate_policy_consumed_len, |
| 348 | comm->rate_policy_len); |
| 349 | goto error; |
| 350 | } |
| 351 | |
| 352 | status = lttng_action_snapshot_session_set_rate_policy( |
| 353 | action, policy); |
| 354 | if (status != LTTNG_ACTION_STATUS_OK) { |
| 355 | goto error; |
| 356 | } |
| 357 | } |
| 358 | |
| 359 | variable_data += comm->rate_policy_len; |
| 360 | consumed_len += comm->rate_policy_len; |
| 361 | |
| 362 | *p_action = action; |
| 363 | action = NULL; |
| 364 | |
| 365 | goto end; |
| 366 | |
| 367 | error: |
| 368 | consumed_len = -1; |
| 369 | |
| 370 | end: |
| 371 | lttng_rate_policy_destroy(policy); |
| 372 | lttng_action_snapshot_session_destroy(action); |
| 373 | lttng_snapshot_output_destroy(snapshot_output); |
| 374 | |
| 375 | return consumed_len; |
| 376 | } |
| 377 | |
| 378 | static enum lttng_error_code lttng_action_snapshot_session_mi_serialize( |
| 379 | const struct lttng_action *action, struct mi_writer *writer) |
| 380 | { |
| 381 | int ret; |
| 382 | enum lttng_error_code ret_code; |
| 383 | enum lttng_action_status status; |
| 384 | const char *session_name = NULL; |
| 385 | const struct lttng_snapshot_output *output = NULL; |
| 386 | const struct lttng_rate_policy *policy = NULL; |
| 387 | |
| 388 | LTTNG_ASSERT(action); |
| 389 | LTTNG_ASSERT(IS_SNAPSHOT_SESSION_ACTION(action)); |
| 390 | |
| 391 | status = lttng_action_snapshot_session_get_session_name( |
| 392 | action, &session_name); |
| 393 | LTTNG_ASSERT(status == LTTNG_ACTION_STATUS_OK); |
| 394 | LTTNG_ASSERT(session_name != NULL); |
| 395 | |
| 396 | status = lttng_action_snapshot_session_get_rate_policy(action, &policy); |
| 397 | LTTNG_ASSERT(status == LTTNG_ACTION_STATUS_OK); |
| 398 | LTTNG_ASSERT(policy != NULL); |
| 399 | |
| 400 | /* Open action snapshot session element. */ |
| 401 | ret = mi_lttng_writer_open_element( |
| 402 | writer, mi_lttng_element_action_snapshot_session); |
| 403 | if (ret) { |
| 404 | goto mi_error; |
| 405 | } |
| 406 | |
| 407 | /* Session name. */ |
| 408 | ret = mi_lttng_writer_write_element_string( |
| 409 | writer, mi_lttng_element_session_name, session_name); |
| 410 | if (ret) { |
| 411 | goto mi_error; |
| 412 | } |
| 413 | |
| 414 | /* Output if any. */ |
| 415 | status = lttng_action_snapshot_session_get_output(action, &output); |
| 416 | if (status == LTTNG_ACTION_STATUS_OK) { |
| 417 | LTTNG_ASSERT(output != NULL); |
| 418 | ret_code = lttng_snapshot_output_mi_serialize(output, writer); |
| 419 | if (ret_code != LTTNG_OK) { |
| 420 | goto end; |
| 421 | } |
| 422 | } else if (status != LTTNG_ACTION_STATUS_UNSET) { |
| 423 | /* This should not happen at this point. */ |
| 424 | abort(); |
| 425 | } |
| 426 | |
| 427 | /* Rate policy. */ |
| 428 | ret_code = lttng_rate_policy_mi_serialize(policy, writer); |
| 429 | if (ret_code != LTTNG_OK) { |
| 430 | goto end; |
| 431 | } |
| 432 | |
| 433 | /* Close action_snapshot_session element. */ |
| 434 | ret = mi_lttng_writer_close_element(writer); |
| 435 | if (ret) { |
| 436 | goto mi_error; |
| 437 | } |
| 438 | |
| 439 | ret_code = LTTNG_OK; |
| 440 | goto end; |
| 441 | |
| 442 | mi_error: |
| 443 | ret_code = LTTNG_ERR_MI_IO_FAIL; |
| 444 | end: |
| 445 | return ret_code; |
| 446 | } |
| 447 | |
| 448 | struct lttng_action *lttng_action_snapshot_session_create(void) |
| 449 | { |
| 450 | struct lttng_action_snapshot_session *action_snapshot = NULL; |
| 451 | struct lttng_rate_policy *policy = NULL; |
| 452 | enum lttng_action_status status; |
| 453 | |
| 454 | /* Create a every N = 1 rate policy. */ |
| 455 | policy = lttng_rate_policy_every_n_create(1); |
| 456 | if (!policy) { |
| 457 | goto end; |
| 458 | } |
| 459 | |
| 460 | action_snapshot = zmalloc<lttng_action_snapshot_session>(); |
| 461 | if (!action_snapshot) { |
| 462 | goto end; |
| 463 | } |
| 464 | |
| 465 | lttng_action_init(&action_snapshot->parent, |
| 466 | LTTNG_ACTION_TYPE_SNAPSHOT_SESSION, |
| 467 | lttng_action_snapshot_session_validate, |
| 468 | lttng_action_snapshot_session_serialize, |
| 469 | lttng_action_snapshot_session_is_equal, |
| 470 | lttng_action_snapshot_session_destroy, |
| 471 | lttng_action_snapshot_session_internal_get_rate_policy, |
| 472 | lttng_action_generic_add_error_query_results, |
| 473 | lttng_action_snapshot_session_mi_serialize); |
| 474 | |
| 475 | status = lttng_action_snapshot_session_set_rate_policy( |
| 476 | &action_snapshot->parent, policy); |
| 477 | if (status != LTTNG_ACTION_STATUS_OK) { |
| 478 | lttng_action_destroy(&action_snapshot->parent); |
| 479 | action_snapshot = NULL; |
| 480 | goto end; |
| 481 | } |
| 482 | |
| 483 | end: |
| 484 | lttng_rate_policy_destroy(policy); |
| 485 | return action_snapshot ? &action_snapshot->parent : nullptr; |
| 486 | } |
| 487 | |
| 488 | enum lttng_action_status lttng_action_snapshot_session_set_session_name( |
| 489 | struct lttng_action *action, const char *session_name) |
| 490 | { |
| 491 | struct lttng_action_snapshot_session *action_snapshot_session; |
| 492 | enum lttng_action_status status; |
| 493 | |
| 494 | if (!action || !IS_SNAPSHOT_SESSION_ACTION(action) || !session_name || |
| 495 | strlen(session_name) == 0) { |
| 496 | status = LTTNG_ACTION_STATUS_INVALID; |
| 497 | goto end; |
| 498 | } |
| 499 | |
| 500 | action_snapshot_session = action_snapshot_session_from_action(action); |
| 501 | |
| 502 | free(action_snapshot_session->session_name); |
| 503 | |
| 504 | action_snapshot_session->session_name = strdup(session_name); |
| 505 | if (!action_snapshot_session->session_name) { |
| 506 | status = LTTNG_ACTION_STATUS_ERROR; |
| 507 | goto end; |
| 508 | } |
| 509 | |
| 510 | status = LTTNG_ACTION_STATUS_OK; |
| 511 | end: |
| 512 | return status; |
| 513 | } |
| 514 | |
| 515 | enum lttng_action_status lttng_action_snapshot_session_get_session_name( |
| 516 | const struct lttng_action *action, const char **session_name) |
| 517 | { |
| 518 | const struct lttng_action_snapshot_session *action_snapshot_session; |
| 519 | enum lttng_action_status status; |
| 520 | |
| 521 | if (!action || !IS_SNAPSHOT_SESSION_ACTION(action) || !session_name) { |
| 522 | status = LTTNG_ACTION_STATUS_INVALID; |
| 523 | goto end; |
| 524 | } |
| 525 | |
| 526 | action_snapshot_session = action_snapshot_session_from_action_const(action); |
| 527 | |
| 528 | if (action_snapshot_session->session_name) { |
| 529 | *session_name = action_snapshot_session->session_name; |
| 530 | status = LTTNG_ACTION_STATUS_OK; |
| 531 | } else { |
| 532 | status = LTTNG_ACTION_STATUS_UNSET; |
| 533 | } |
| 534 | |
| 535 | end: |
| 536 | |
| 537 | return status; |
| 538 | } |
| 539 | |
| 540 | enum lttng_action_status lttng_action_snapshot_session_set_output( |
| 541 | struct lttng_action *action, |
| 542 | struct lttng_snapshot_output *output) |
| 543 | { |
| 544 | struct lttng_action_snapshot_session *action_snapshot_session; |
| 545 | enum lttng_action_status status; |
| 546 | |
| 547 | if (!action || !IS_SNAPSHOT_SESSION_ACTION(action) || !output) { |
| 548 | status = LTTNG_ACTION_STATUS_INVALID; |
| 549 | goto end; |
| 550 | } |
| 551 | |
| 552 | action_snapshot_session = action_snapshot_session_from_action(action); |
| 553 | |
| 554 | lttng_snapshot_output_destroy(action_snapshot_session->output); |
| 555 | action_snapshot_session->output = output; |
| 556 | |
| 557 | status = LTTNG_ACTION_STATUS_OK; |
| 558 | |
| 559 | end: |
| 560 | return status; |
| 561 | } |
| 562 | |
| 563 | enum lttng_action_status lttng_action_snapshot_session_get_output( |
| 564 | const struct lttng_action *action, |
| 565 | const struct lttng_snapshot_output **output) |
| 566 | { |
| 567 | const struct lttng_action_snapshot_session *action_snapshot_session; |
| 568 | enum lttng_action_status status; |
| 569 | |
| 570 | if (!action || !IS_SNAPSHOT_SESSION_ACTION(action)|| !output) { |
| 571 | status = LTTNG_ACTION_STATUS_INVALID; |
| 572 | goto end; |
| 573 | } |
| 574 | |
| 575 | action_snapshot_session = action_snapshot_session_from_action_const(action); |
| 576 | |
| 577 | if (action_snapshot_session->output) { |
| 578 | *output = action_snapshot_session->output; |
| 579 | status = LTTNG_ACTION_STATUS_OK; |
| 580 | } else { |
| 581 | status = LTTNG_ACTION_STATUS_UNSET; |
| 582 | } |
| 583 | |
| 584 | end: |
| 585 | return status; |
| 586 | } |
| 587 | |
| 588 | enum lttng_action_status lttng_action_snapshot_session_set_rate_policy( |
| 589 | struct lttng_action *action, |
| 590 | const struct lttng_rate_policy *policy) |
| 591 | { |
| 592 | enum lttng_action_status status; |
| 593 | struct lttng_action_snapshot_session *snapshot_session_action; |
| 594 | struct lttng_rate_policy *copy = NULL; |
| 595 | |
| 596 | if (!action || !policy || !IS_SNAPSHOT_SESSION_ACTION(action)) { |
| 597 | status = LTTNG_ACTION_STATUS_INVALID; |
| 598 | goto end; |
| 599 | } |
| 600 | |
| 601 | copy = lttng_rate_policy_copy(policy); |
| 602 | if (!copy) { |
| 603 | status = LTTNG_ACTION_STATUS_ERROR; |
| 604 | goto end; |
| 605 | } |
| 606 | |
| 607 | snapshot_session_action = action_snapshot_session_from_action(action); |
| 608 | |
| 609 | /* Free the previous rate policy .*/ |
| 610 | lttng_rate_policy_destroy(snapshot_session_action->policy); |
| 611 | |
| 612 | /* Assign the policy. */ |
| 613 | snapshot_session_action->policy = copy; |
| 614 | status = LTTNG_ACTION_STATUS_OK; |
| 615 | copy = NULL; |
| 616 | |
| 617 | end: |
| 618 | lttng_rate_policy_destroy(copy); |
| 619 | return status; |
| 620 | } |
| 621 | |
| 622 | enum lttng_action_status lttng_action_snapshot_session_get_rate_policy( |
| 623 | const struct lttng_action *action, |
| 624 | const struct lttng_rate_policy **policy) |
| 625 | { |
| 626 | enum lttng_action_status status; |
| 627 | const struct lttng_action_snapshot_session *snapshot_session_action; |
| 628 | |
| 629 | if (!action || !policy || !IS_SNAPSHOT_SESSION_ACTION(action)) { |
| 630 | status = LTTNG_ACTION_STATUS_INVALID; |
| 631 | goto end; |
| 632 | } |
| 633 | |
| 634 | snapshot_session_action = |
| 635 | action_snapshot_session_from_action_const(action); |
| 636 | |
| 637 | *policy = snapshot_session_action->policy; |
| 638 | status = LTTNG_ACTION_STATUS_OK; |
| 639 | end: |
| 640 | return status; |
| 641 | } |
| 642 | |
| 643 | static const struct lttng_rate_policy * |
| 644 | lttng_action_snapshot_session_internal_get_rate_policy( |
| 645 | const struct lttng_action *action) |
| 646 | { |
| 647 | const struct lttng_action_snapshot_session *_action; |
| 648 | _action = action_snapshot_session_from_action_const(action); |
| 649 | |
| 650 | return _action->policy; |
| 651 | } |