| 1 | /* |
| 2 | * Copyright (C) 2011 EfficiOS Inc. |
| 3 | * Copyright (C) 2016 Jérémie Galarneau <jeremie.galarneau@efficios.com> |
| 4 | * |
| 5 | * SPDX-License-Identifier: GPL-2.0-only |
| 6 | * |
| 7 | */ |
| 8 | |
| 9 | #define _LGPL_SOURCE |
| 10 | #include "agent.hpp" |
| 11 | #include "channel.hpp" |
| 12 | #include "kernel.hpp" |
| 13 | #include "lttng-sessiond.hpp" |
| 14 | #include "lttng-ust-ctl.hpp" |
| 15 | #include "lttng-ust-error.hpp" |
| 16 | #include "ust-app.hpp" |
| 17 | #include "utils.hpp" |
| 18 | |
| 19 | #include <common/common.hpp> |
| 20 | #include <common/defaults.hpp> |
| 21 | #include <common/sessiond-comm/sessiond-comm.hpp> |
| 22 | |
| 23 | #include <inttypes.h> |
| 24 | #include <string.h> |
| 25 | #include <unistd.h> |
| 26 | |
| 27 | /* |
| 28 | * Return allocated channel attributes. |
| 29 | */ |
| 30 | struct lttng_channel *channel_new_default_attr(int dom, enum lttng_buffer_type type) |
| 31 | { |
| 32 | struct lttng_channel *chan; |
| 33 | const char *channel_name = DEFAULT_CHANNEL_NAME; |
| 34 | struct lttng_channel_extended *extended_attr = nullptr; |
| 35 | |
| 36 | chan = zmalloc<lttng_channel>(); |
| 37 | if (chan == nullptr) { |
| 38 | PERROR("zmalloc channel init"); |
| 39 | goto error_alloc; |
| 40 | } |
| 41 | |
| 42 | extended_attr = zmalloc<lttng_channel_extended>(); |
| 43 | if (!extended_attr) { |
| 44 | PERROR("zmalloc channel extended init"); |
| 45 | goto error; |
| 46 | } |
| 47 | |
| 48 | chan->attr.extended.ptr = extended_attr; |
| 49 | |
| 50 | /* Same for all domains. */ |
| 51 | chan->attr.overwrite = DEFAULT_CHANNEL_OVERWRITE; |
| 52 | chan->attr.tracefile_size = DEFAULT_CHANNEL_TRACEFILE_SIZE; |
| 53 | chan->attr.tracefile_count = DEFAULT_CHANNEL_TRACEFILE_COUNT; |
| 54 | |
| 55 | switch (dom) { |
| 56 | case LTTNG_DOMAIN_KERNEL: |
| 57 | LTTNG_ASSERT(type == LTTNG_BUFFER_GLOBAL); |
| 58 | chan->attr.subbuf_size = default_get_kernel_channel_subbuf_size(); |
| 59 | chan->attr.num_subbuf = DEFAULT_KERNEL_CHANNEL_SUBBUF_NUM; |
| 60 | chan->attr.output = DEFAULT_KERNEL_CHANNEL_OUTPUT; |
| 61 | chan->attr.switch_timer_interval = DEFAULT_KERNEL_CHANNEL_SWITCH_TIMER; |
| 62 | chan->attr.read_timer_interval = DEFAULT_KERNEL_CHANNEL_READ_TIMER; |
| 63 | chan->attr.live_timer_interval = DEFAULT_KERNEL_CHANNEL_LIVE_TIMER; |
| 64 | extended_attr->blocking_timeout = DEFAULT_KERNEL_CHANNEL_BLOCKING_TIMEOUT; |
| 65 | extended_attr->monitor_timer_interval = DEFAULT_KERNEL_CHANNEL_MONITOR_TIMER; |
| 66 | break; |
| 67 | case LTTNG_DOMAIN_JUL: |
| 68 | channel_name = DEFAULT_JUL_CHANNEL_NAME; |
| 69 | goto common_ust; |
| 70 | case LTTNG_DOMAIN_LOG4J: |
| 71 | channel_name = DEFAULT_LOG4J_CHANNEL_NAME; |
| 72 | goto common_ust; |
| 73 | case LTTNG_DOMAIN_PYTHON: |
| 74 | channel_name = DEFAULT_PYTHON_CHANNEL_NAME; |
| 75 | goto common_ust; |
| 76 | case LTTNG_DOMAIN_UST: |
| 77 | common_ust: |
| 78 | switch (type) { |
| 79 | case LTTNG_BUFFER_PER_UID: |
| 80 | chan->attr.subbuf_size = default_get_ust_uid_channel_subbuf_size(); |
| 81 | chan->attr.num_subbuf = DEFAULT_UST_UID_CHANNEL_SUBBUF_NUM; |
| 82 | chan->attr.output = DEFAULT_UST_UID_CHANNEL_OUTPUT; |
| 83 | chan->attr.switch_timer_interval = DEFAULT_UST_UID_CHANNEL_SWITCH_TIMER; |
| 84 | chan->attr.read_timer_interval = DEFAULT_UST_UID_CHANNEL_READ_TIMER; |
| 85 | chan->attr.live_timer_interval = DEFAULT_UST_UID_CHANNEL_LIVE_TIMER; |
| 86 | extended_attr->blocking_timeout = DEFAULT_UST_UID_CHANNEL_BLOCKING_TIMEOUT; |
| 87 | extended_attr->monitor_timer_interval = |
| 88 | DEFAULT_UST_UID_CHANNEL_MONITOR_TIMER; |
| 89 | break; |
| 90 | case LTTNG_BUFFER_PER_PID: |
| 91 | default: |
| 92 | chan->attr.subbuf_size = default_get_ust_pid_channel_subbuf_size(); |
| 93 | chan->attr.num_subbuf = DEFAULT_UST_PID_CHANNEL_SUBBUF_NUM; |
| 94 | chan->attr.output = DEFAULT_UST_PID_CHANNEL_OUTPUT; |
| 95 | chan->attr.switch_timer_interval = DEFAULT_UST_PID_CHANNEL_SWITCH_TIMER; |
| 96 | chan->attr.read_timer_interval = DEFAULT_UST_PID_CHANNEL_READ_TIMER; |
| 97 | chan->attr.live_timer_interval = DEFAULT_UST_PID_CHANNEL_LIVE_TIMER; |
| 98 | extended_attr->blocking_timeout = DEFAULT_UST_PID_CHANNEL_BLOCKING_TIMEOUT; |
| 99 | extended_attr->monitor_timer_interval = |
| 100 | DEFAULT_UST_PID_CHANNEL_MONITOR_TIMER; |
| 101 | break; |
| 102 | } |
| 103 | break; |
| 104 | default: |
| 105 | goto error; /* Not implemented */ |
| 106 | } |
| 107 | |
| 108 | if (snprintf(chan->name, sizeof(chan->name), "%s", channel_name) < 0) { |
| 109 | PERROR("snprintf default channel name"); |
| 110 | goto error; |
| 111 | } |
| 112 | return chan; |
| 113 | |
| 114 | error: |
| 115 | free(extended_attr); |
| 116 | free(chan); |
| 117 | error_alloc: |
| 118 | return nullptr; |
| 119 | } |
| 120 | |
| 121 | void channel_attr_destroy(struct lttng_channel *channel) |
| 122 | { |
| 123 | if (!channel) { |
| 124 | return; |
| 125 | } |
| 126 | free(channel->attr.extended.ptr); |
| 127 | free(channel); |
| 128 | } |
| 129 | |
| 130 | /* |
| 131 | * Disable kernel channel of the kernel session. |
| 132 | */ |
| 133 | int channel_kernel_disable(struct ltt_kernel_session *ksession, char *channel_name) |
| 134 | { |
| 135 | int ret; |
| 136 | struct ltt_kernel_channel *kchan; |
| 137 | |
| 138 | LTTNG_ASSERT(ksession); |
| 139 | LTTNG_ASSERT(channel_name); |
| 140 | |
| 141 | kchan = trace_kernel_get_channel_by_name(channel_name, ksession); |
| 142 | if (kchan == nullptr) { |
| 143 | ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND; |
| 144 | goto error; |
| 145 | } |
| 146 | |
| 147 | /* Only if channel is enabled disable it. */ |
| 148 | if (kchan->enabled) { |
| 149 | ret = kernel_disable_channel(kchan); |
| 150 | if (ret < 0 && ret != -EEXIST) { |
| 151 | ret = LTTNG_ERR_KERN_CHAN_DISABLE_FAIL; |
| 152 | goto error; |
| 153 | } |
| 154 | } |
| 155 | |
| 156 | ret = LTTNG_OK; |
| 157 | |
| 158 | error: |
| 159 | return ret; |
| 160 | } |
| 161 | |
| 162 | /* |
| 163 | * Enable kernel channel of the kernel session. |
| 164 | */ |
| 165 | enum lttng_error_code channel_kernel_enable(struct ltt_kernel_session *ksession, |
| 166 | struct ltt_kernel_channel *kchan) |
| 167 | { |
| 168 | enum lttng_error_code ret_code; |
| 169 | |
| 170 | LTTNG_ASSERT(ksession); |
| 171 | LTTNG_ASSERT(kchan); |
| 172 | |
| 173 | if (!kchan->enabled) { |
| 174 | if (kernel_enable_channel(kchan) < 0) { |
| 175 | ret_code = LTTNG_ERR_KERN_CHAN_ENABLE_FAIL; |
| 176 | goto error; |
| 177 | } |
| 178 | } else { |
| 179 | ret_code = LTTNG_ERR_KERN_CHAN_EXIST; |
| 180 | goto error; |
| 181 | } |
| 182 | |
| 183 | ret_code = LTTNG_OK; |
| 184 | |
| 185 | error: |
| 186 | return ret_code; |
| 187 | } |
| 188 | |
| 189 | static int channel_validate(struct lttng_channel *attr) |
| 190 | { |
| 191 | /* |
| 192 | * The ringbuffer (both in user space and kernel) behaves badly |
| 193 | * in overwrite mode and with less than 2 subbuffers so block it |
| 194 | * right away and send back an invalid attribute error. |
| 195 | */ |
| 196 | if (attr->attr.overwrite && attr->attr.num_subbuf < 2) { |
| 197 | return -1; |
| 198 | } |
| 199 | return 0; |
| 200 | } |
| 201 | |
| 202 | static int channel_validate_kernel(struct lttng_channel *attr) |
| 203 | { |
| 204 | /* Kernel channels do not support blocking timeout. */ |
| 205 | if (((struct lttng_channel_extended *) attr->attr.extended.ptr)->blocking_timeout) { |
| 206 | return -1; |
| 207 | } |
| 208 | return 0; |
| 209 | } |
| 210 | |
| 211 | /* |
| 212 | * Create kernel channel of the kernel session and notify kernel thread. |
| 213 | */ |
| 214 | enum lttng_error_code channel_kernel_create(struct ltt_kernel_session *ksession, |
| 215 | struct lttng_channel *attr, |
| 216 | int kernel_pipe) |
| 217 | { |
| 218 | enum lttng_error_code ret_code; |
| 219 | struct lttng_channel *defattr = nullptr; |
| 220 | |
| 221 | LTTNG_ASSERT(ksession); |
| 222 | |
| 223 | /* Creating channel attributes if needed */ |
| 224 | if (attr == nullptr) { |
| 225 | defattr = channel_new_default_attr(LTTNG_DOMAIN_KERNEL, LTTNG_BUFFER_GLOBAL); |
| 226 | if (defattr == nullptr) { |
| 227 | ret_code = LTTNG_ERR_FATAL; |
| 228 | goto error; |
| 229 | } |
| 230 | attr = defattr; |
| 231 | } |
| 232 | |
| 233 | /* |
| 234 | * Set the overwrite mode for this channel based on the session |
| 235 | * type unless the client explicitly overrides the channel mode. |
| 236 | */ |
| 237 | if (attr->attr.overwrite == DEFAULT_CHANNEL_OVERWRITE) { |
| 238 | attr->attr.overwrite = !!ksession->snapshot_mode; |
| 239 | } |
| 240 | |
| 241 | /* Validate common channel properties. */ |
| 242 | if (channel_validate(attr) < 0) { |
| 243 | ret_code = LTTNG_ERR_INVALID; |
| 244 | goto error; |
| 245 | } |
| 246 | |
| 247 | if (channel_validate_kernel(attr) < 0) { |
| 248 | ret_code = LTTNG_ERR_INVALID; |
| 249 | goto error; |
| 250 | } |
| 251 | |
| 252 | /* Channel not found, creating it. */ |
| 253 | if (kernel_create_channel(ksession, attr) < 0) { |
| 254 | ret_code = LTTNG_ERR_KERN_CHAN_FAIL; |
| 255 | goto error; |
| 256 | } |
| 257 | |
| 258 | /* Notify kernel thread that there is a new channel */ |
| 259 | if (notify_thread_pipe(kernel_pipe) < 0) { |
| 260 | ret_code = LTTNG_ERR_FATAL; |
| 261 | goto error; |
| 262 | } |
| 263 | |
| 264 | ret_code = LTTNG_OK; |
| 265 | error: |
| 266 | channel_attr_destroy(defattr); |
| 267 | return ret_code; |
| 268 | } |
| 269 | |
| 270 | /* |
| 271 | * Enable UST channel for session and domain. |
| 272 | */ |
| 273 | enum lttng_error_code channel_ust_enable(struct ltt_ust_session *usess, |
| 274 | struct ltt_ust_channel *uchan) |
| 275 | { |
| 276 | enum lttng_error_code ret_code = LTTNG_OK; |
| 277 | |
| 278 | LTTNG_ASSERT(usess); |
| 279 | LTTNG_ASSERT(uchan); |
| 280 | |
| 281 | /* If already enabled, everything is OK */ |
| 282 | if (uchan->enabled) { |
| 283 | DBG3("Channel %s already enabled. Skipping", uchan->name); |
| 284 | ret_code = LTTNG_ERR_UST_CHAN_EXIST; |
| 285 | goto end; |
| 286 | } else { |
| 287 | uchan->enabled = true; |
| 288 | DBG2("Channel %s enabled successfully", uchan->name); |
| 289 | } |
| 290 | |
| 291 | if (!usess->active) { |
| 292 | /* |
| 293 | * The channel will be activated against the apps |
| 294 | * when the session is started as part of the |
| 295 | * application channel "synchronize" operation. |
| 296 | */ |
| 297 | goto end; |
| 298 | } |
| 299 | |
| 300 | DBG2("Channel %s being enabled in UST domain", uchan->name); |
| 301 | |
| 302 | /* |
| 303 | * Enable channel for UST global domain on all applications. Ignore return |
| 304 | * value here since whatever error we got, it means that the channel was |
| 305 | * not created on one or many registered applications and we can not report |
| 306 | * this to the user yet. However, at this stage, the channel was |
| 307 | * successfully created on the session daemon side so the enable-channel |
| 308 | * command is a success. |
| 309 | */ |
| 310 | (void) ust_app_enable_channel_glb(usess, uchan); |
| 311 | |
| 312 | end: |
| 313 | return ret_code; |
| 314 | } |
| 315 | |
| 316 | /* |
| 317 | * Create UST channel for session and domain. |
| 318 | */ |
| 319 | enum lttng_error_code channel_ust_create(struct ltt_ust_session *usess, |
| 320 | struct lttng_channel *attr, |
| 321 | enum lttng_buffer_type type) |
| 322 | { |
| 323 | enum lttng_error_code ret_code = LTTNG_OK; |
| 324 | struct ltt_ust_channel *uchan = nullptr; |
| 325 | struct lttng_channel *defattr = nullptr; |
| 326 | enum lttng_domain_type domain = LTTNG_DOMAIN_UST; |
| 327 | bool chan_published = false; |
| 328 | lttng::urcu::read_lock_guard read_lock; |
| 329 | |
| 330 | LTTNG_ASSERT(usess); |
| 331 | |
| 332 | /* Creating channel attributes if needed */ |
| 333 | if (attr == nullptr) { |
| 334 | defattr = channel_new_default_attr(LTTNG_DOMAIN_UST, type); |
| 335 | if (defattr == nullptr) { |
| 336 | ret_code = LTTNG_ERR_FATAL; |
| 337 | goto error; |
| 338 | } |
| 339 | attr = defattr; |
| 340 | } else { |
| 341 | /* |
| 342 | * HACK: Set the channel's subdomain (JUL, Log4j, Python, etc.) |
| 343 | * based on the default name. |
| 344 | */ |
| 345 | if (!strcmp(attr->name, DEFAULT_JUL_CHANNEL_NAME)) { |
| 346 | domain = LTTNG_DOMAIN_JUL; |
| 347 | } else if (!strcmp(attr->name, DEFAULT_LOG4J_CHANNEL_NAME)) { |
| 348 | domain = LTTNG_DOMAIN_LOG4J; |
| 349 | } else if (!strcmp(attr->name, DEFAULT_PYTHON_CHANNEL_NAME)) { |
| 350 | domain = LTTNG_DOMAIN_PYTHON; |
| 351 | } |
| 352 | } |
| 353 | |
| 354 | /* |
| 355 | * Set the overwrite mode for this channel based on the session |
| 356 | * type unless the client explicitly overrides the channel mode. |
| 357 | */ |
| 358 | if (attr->attr.overwrite == DEFAULT_CHANNEL_OVERWRITE) { |
| 359 | attr->attr.overwrite = !!usess->snapshot_mode; |
| 360 | } |
| 361 | |
| 362 | /* Enforce mmap output for snapshot sessions. */ |
| 363 | if (usess->snapshot_mode) { |
| 364 | attr->attr.output = LTTNG_EVENT_MMAP; |
| 365 | } |
| 366 | |
| 367 | /* Validate common channel properties. */ |
| 368 | if (channel_validate(attr) < 0) { |
| 369 | ret_code = LTTNG_ERR_INVALID; |
| 370 | goto error; |
| 371 | } |
| 372 | |
| 373 | /* |
| 374 | * Validate UST buffer size and number of buffers: must both be power of 2 |
| 375 | * and nonzero. We validate right here for UST, because applications will |
| 376 | * not report the error to the user (unlike kernel tracing). |
| 377 | */ |
| 378 | if (!attr->attr.subbuf_size || (attr->attr.subbuf_size & (attr->attr.subbuf_size - 1))) { |
| 379 | ret_code = LTTNG_ERR_INVALID; |
| 380 | goto error; |
| 381 | } |
| 382 | |
| 383 | /* |
| 384 | * Invalid subbuffer size if it's lower then the page size. |
| 385 | */ |
| 386 | if (attr->attr.subbuf_size < the_page_size) { |
| 387 | ret_code = LTTNG_ERR_INVALID; |
| 388 | goto error; |
| 389 | } |
| 390 | |
| 391 | if (!attr->attr.num_subbuf || (attr->attr.num_subbuf & (attr->attr.num_subbuf - 1))) { |
| 392 | ret_code = LTTNG_ERR_INVALID; |
| 393 | goto error; |
| 394 | } |
| 395 | |
| 396 | if (attr->attr.output != LTTNG_EVENT_MMAP) { |
| 397 | ret_code = LTTNG_ERR_NOT_SUPPORTED; |
| 398 | goto error; |
| 399 | } |
| 400 | |
| 401 | /* |
| 402 | * The tracefile_size should not be < to the subbuf_size, otherwise |
| 403 | * we won't be able to write the packets on disk |
| 404 | */ |
| 405 | if ((attr->attr.tracefile_size > 0) && |
| 406 | (attr->attr.tracefile_size < attr->attr.subbuf_size)) { |
| 407 | ret_code = LTTNG_ERR_INVALID; |
| 408 | goto error; |
| 409 | } |
| 410 | |
| 411 | /* Validate buffer type. */ |
| 412 | switch (type) { |
| 413 | case LTTNG_BUFFER_PER_PID: |
| 414 | break; |
| 415 | case LTTNG_BUFFER_PER_UID: |
| 416 | break; |
| 417 | default: |
| 418 | ret_code = LTTNG_ERR_BUFFER_NOT_SUPPORTED; |
| 419 | goto error; |
| 420 | } |
| 421 | |
| 422 | /* Create UST channel */ |
| 423 | uchan = trace_ust_create_channel(attr, domain); |
| 424 | if (uchan == nullptr) { |
| 425 | ret_code = LTTNG_ERR_FATAL; |
| 426 | goto error; |
| 427 | } |
| 428 | |
| 429 | uchan->enabled = true; |
| 430 | if (trace_ust_is_max_id(usess->used_event_container_id)) { |
| 431 | ret_code = LTTNG_ERR_UST_CHAN_FAIL; |
| 432 | goto error; |
| 433 | } |
| 434 | |
| 435 | uchan->id = trace_ust_get_next_event_container_id(usess); |
| 436 | |
| 437 | DBG2("Channel %s is being created for UST with buffer %d and id %" PRIu64, |
| 438 | uchan->name, |
| 439 | type, |
| 440 | uchan->id); |
| 441 | |
| 442 | /* Flag session buffer type. */ |
| 443 | if (!usess->buffer_type_changed) { |
| 444 | usess->buffer_type = type; |
| 445 | usess->buffer_type_changed = 1; |
| 446 | } else if (usess->buffer_type != type) { |
| 447 | /* Buffer type was already set. Refuse to create channel. */ |
| 448 | ret_code = LTTNG_ERR_BUFFER_TYPE_MISMATCH; |
| 449 | goto error_free_chan; |
| 450 | } |
| 451 | |
| 452 | /* Adding the channel to the channel hash table. */ |
| 453 | if (strncmp(uchan->name, DEFAULT_METADATA_NAME, sizeof(uchan->name)) != 0) { |
| 454 | lttng_ht_add_unique_str(usess->domain_global.channels, &uchan->node); |
| 455 | chan_published = true; |
| 456 | } else { |
| 457 | /* |
| 458 | * Copy channel attribute to session if this is metadata so if NO |
| 459 | * application exists we can access that data in the shadow copy during |
| 460 | * the global update of newly registered application. |
| 461 | */ |
| 462 | memcpy(&usess->metadata_attr, &uchan->attr, sizeof(usess->metadata_attr)); |
| 463 | } |
| 464 | |
| 465 | DBG2("Channel %s created successfully", uchan->name); |
| 466 | if (domain != LTTNG_DOMAIN_UST) { |
| 467 | struct agent *agt = trace_ust_find_agent(usess, domain); |
| 468 | |
| 469 | if (!agt) { |
| 470 | agt = agent_create(domain); |
| 471 | if (!agt) { |
| 472 | ret_code = LTTNG_ERR_NOMEM; |
| 473 | goto error_remove_chan; |
| 474 | } |
| 475 | agent_add(agt, usess->agents); |
| 476 | } |
| 477 | } |
| 478 | |
| 479 | channel_attr_destroy(defattr); |
| 480 | return LTTNG_OK; |
| 481 | |
| 482 | error_remove_chan: |
| 483 | if (chan_published) { |
| 484 | trace_ust_delete_channel(usess->domain_global.channels, uchan); |
| 485 | } |
| 486 | error_free_chan: |
| 487 | trace_ust_destroy_channel(uchan); |
| 488 | error: |
| 489 | channel_attr_destroy(defattr); |
| 490 | return ret_code; |
| 491 | } |
| 492 | |
| 493 | /* |
| 494 | * Disable UST channel for session and domain. |
| 495 | */ |
| 496 | int channel_ust_disable(struct ltt_ust_session *usess, struct ltt_ust_channel *uchan) |
| 497 | { |
| 498 | int ret = LTTNG_OK; |
| 499 | |
| 500 | LTTNG_ASSERT(usess); |
| 501 | LTTNG_ASSERT(uchan); |
| 502 | |
| 503 | /* Already disabled */ |
| 504 | if (!uchan->enabled) { |
| 505 | DBG2("Channel UST %s already disabled", uchan->name); |
| 506 | goto end; |
| 507 | } |
| 508 | |
| 509 | uchan->enabled = false; |
| 510 | |
| 511 | /* |
| 512 | * If session is inactive we don't notify the tracer right away. We |
| 513 | * wait for the next synchronization. |
| 514 | */ |
| 515 | if (!usess->active) { |
| 516 | goto end; |
| 517 | } |
| 518 | |
| 519 | DBG2("Channel %s being disabled in UST global domain", uchan->name); |
| 520 | /* Disable channel for global domain */ |
| 521 | ret = ust_app_disable_channel_glb(usess, uchan); |
| 522 | if (ret < 0 && ret != -LTTNG_UST_ERR_EXIST) { |
| 523 | ret = LTTNG_ERR_UST_CHAN_DISABLE_FAIL; |
| 524 | goto error; |
| 525 | } |
| 526 | |
| 527 | DBG2("Channel %s disabled successfully", uchan->name); |
| 528 | |
| 529 | return LTTNG_OK; |
| 530 | |
| 531 | end: |
| 532 | error: |
| 533 | return ret; |
| 534 | } |
| 535 | |
| 536 | struct lttng_channel *trace_ust_channel_to_lttng_channel(const struct ltt_ust_channel *uchan) |
| 537 | { |
| 538 | struct lttng_channel *channel = nullptr, *ret = nullptr; |
| 539 | |
| 540 | channel = lttng_channel_create_internal(); |
| 541 | if (!channel) { |
| 542 | ERR("Failed to create lttng_channel during conversion from ltt_ust_channel to lttng_channel"); |
| 543 | goto end; |
| 544 | } |
| 545 | |
| 546 | if (lttng_strncpy(channel->name, uchan->name, LTTNG_SYMBOL_NAME_LEN)) { |
| 547 | ERR("Failed to set channel name during conversion from ltt_ust_channel to lttng_channel"); |
| 548 | goto end; |
| 549 | } |
| 550 | |
| 551 | channel->attr.overwrite = uchan->attr.overwrite; |
| 552 | channel->attr.subbuf_size = uchan->attr.subbuf_size; |
| 553 | channel->attr.num_subbuf = uchan->attr.num_subbuf; |
| 554 | channel->attr.switch_timer_interval = uchan->attr.switch_timer_interval; |
| 555 | channel->attr.read_timer_interval = uchan->attr.read_timer_interval; |
| 556 | channel->enabled = uchan->enabled; |
| 557 | channel->attr.tracefile_size = uchan->tracefile_size; |
| 558 | channel->attr.tracefile_count = uchan->tracefile_count; |
| 559 | |
| 560 | /* |
| 561 | * Map enum lttng_ust_output to enum lttng_event_output. |
| 562 | */ |
| 563 | switch (uchan->attr.output) { |
| 564 | case LTTNG_UST_ABI_MMAP: |
| 565 | channel->attr.output = LTTNG_EVENT_MMAP; |
| 566 | break; |
| 567 | default: |
| 568 | /* |
| 569 | * LTTNG_UST_MMAP is the only supported UST |
| 570 | * output mode. |
| 571 | */ |
| 572 | abort(); |
| 573 | break; |
| 574 | } |
| 575 | |
| 576 | lttng_channel_set_blocking_timeout(channel, uchan->attr.u.s.blocking_timeout); |
| 577 | lttng_channel_set_monitor_timer_interval(channel, uchan->monitor_timer_interval); |
| 578 | |
| 579 | ret = channel; |
| 580 | channel = nullptr; |
| 581 | |
| 582 | end: |
| 583 | lttng_channel_destroy(channel); |
| 584 | return ret; |
| 585 | } |