| 1 | /* |
| 2 | * Copyright (C) 2012 - David Goulet <dgoulet@efficios.com> |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or modify it |
| 5 | * under the terms of the GNU General Public License, version 2 only, as |
| 6 | * published by the Free Software Foundation. |
| 7 | * |
| 8 | * This program is distributed in the hope that it will be useful, but WITHOUT |
| 9 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 10 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for |
| 11 | * more details. |
| 12 | * |
| 13 | * You should have received a copy of the GNU General Public License along with |
| 14 | * this program; if not, write to the Free Software Foundation, Inc., 51 |
| 15 | * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. |
| 16 | */ |
| 17 | |
| 18 | #define _GNU_SOURCE |
| 19 | #include <assert.h> |
| 20 | #include <urcu/list.h> |
| 21 | #include <urcu/uatomic.h> |
| 22 | |
| 23 | #include <common/defaults.h> |
| 24 | #include <common/common.h> |
| 25 | #include <common/sessiond-comm/sessiond-comm.h> |
| 26 | #include <common/relayd/relayd.h> |
| 27 | |
| 28 | #include "channel.h" |
| 29 | #include "consumer.h" |
| 30 | #include "event.h" |
| 31 | #include "health.h" |
| 32 | #include "kernel.h" |
| 33 | #include "kernel-consumer.h" |
| 34 | #include "lttng-sessiond.h" |
| 35 | #include "utils.h" |
| 36 | |
| 37 | #include "cmd.h" |
| 38 | |
| 39 | /* |
| 40 | * Used to keep a unique index for each relayd socket created where this value |
| 41 | * is associated with streams on the consumer so it can match the right relayd |
| 42 | * to send to. It must be accessed with the relayd_net_seq_idx_lock |
| 43 | * held. |
| 44 | */ |
| 45 | static pthread_mutex_t relayd_net_seq_idx_lock = PTHREAD_MUTEX_INITIALIZER; |
| 46 | static uint64_t relayd_net_seq_idx; |
| 47 | |
| 48 | /* |
| 49 | * Create a session path used by list_lttng_sessions for the case that the |
| 50 | * session consumer is on the network. |
| 51 | */ |
| 52 | static int build_network_session_path(char *dst, size_t size, |
| 53 | struct ltt_session *session) |
| 54 | { |
| 55 | int ret, kdata_port, udata_port; |
| 56 | struct lttng_uri *kuri = NULL, *uuri = NULL, *uri = NULL; |
| 57 | char tmp_uurl[PATH_MAX], tmp_urls[PATH_MAX]; |
| 58 | |
| 59 | assert(session); |
| 60 | assert(dst); |
| 61 | |
| 62 | memset(tmp_urls, 0, sizeof(tmp_urls)); |
| 63 | memset(tmp_uurl, 0, sizeof(tmp_uurl)); |
| 64 | |
| 65 | kdata_port = udata_port = DEFAULT_NETWORK_DATA_PORT; |
| 66 | |
| 67 | if (session->kernel_session && session->kernel_session->consumer) { |
| 68 | kuri = &session->kernel_session->consumer->dst.net.control; |
| 69 | kdata_port = session->kernel_session->consumer->dst.net.data.port; |
| 70 | } |
| 71 | |
| 72 | if (session->ust_session && session->ust_session->consumer) { |
| 73 | uuri = &session->ust_session->consumer->dst.net.control; |
| 74 | udata_port = session->ust_session->consumer->dst.net.data.port; |
| 75 | } |
| 76 | |
| 77 | if (uuri == NULL && kuri == NULL) { |
| 78 | uri = &session->consumer->dst.net.control; |
| 79 | kdata_port = session->consumer->dst.net.data.port; |
| 80 | } else if (kuri && uuri) { |
| 81 | ret = uri_compare(kuri, uuri); |
| 82 | if (ret) { |
| 83 | /* Not Equal */ |
| 84 | uri = kuri; |
| 85 | /* Build uuri URL string */ |
| 86 | ret = uri_to_str_url(uuri, tmp_uurl, sizeof(tmp_uurl)); |
| 87 | if (ret < 0) { |
| 88 | goto error; |
| 89 | } |
| 90 | } else { |
| 91 | uri = kuri; |
| 92 | } |
| 93 | } else if (kuri && uuri == NULL) { |
| 94 | uri = kuri; |
| 95 | } else if (uuri && kuri == NULL) { |
| 96 | uri = uuri; |
| 97 | } |
| 98 | |
| 99 | ret = uri_to_str_url(uri, tmp_urls, sizeof(tmp_urls)); |
| 100 | if (ret < 0) { |
| 101 | goto error; |
| 102 | } |
| 103 | |
| 104 | /* |
| 105 | * Do we have a UST url set. If yes, this means we have both kernel and UST |
| 106 | * to print. |
| 107 | */ |
| 108 | if (*tmp_uurl != '\0') { |
| 109 | ret = snprintf(dst, size, "[K]: %s [data: %d] -- [U]: %s [data: %d]", |
| 110 | tmp_urls, kdata_port, tmp_uurl, udata_port); |
| 111 | } else { |
| 112 | int dport; |
| 113 | if (kuri || (!kuri && !uuri)) { |
| 114 | dport = kdata_port; |
| 115 | } else { |
| 116 | /* No kernel URI, use the UST port. */ |
| 117 | dport = udata_port; |
| 118 | } |
| 119 | ret = snprintf(dst, size, "%s [data: %d]", tmp_urls, dport); |
| 120 | } |
| 121 | |
| 122 | error: |
| 123 | return ret; |
| 124 | } |
| 125 | |
| 126 | /* |
| 127 | * Fill lttng_channel array of all channels. |
| 128 | */ |
| 129 | static void list_lttng_channels(int domain, struct ltt_session *session, |
| 130 | struct lttng_channel *channels) |
| 131 | { |
| 132 | int i = 0; |
| 133 | struct ltt_kernel_channel *kchan; |
| 134 | |
| 135 | DBG("Listing channels for session %s", session->name); |
| 136 | |
| 137 | switch (domain) { |
| 138 | case LTTNG_DOMAIN_KERNEL: |
| 139 | /* Kernel channels */ |
| 140 | if (session->kernel_session != NULL) { |
| 141 | cds_list_for_each_entry(kchan, |
| 142 | &session->kernel_session->channel_list.head, list) { |
| 143 | /* Copy lttng_channel struct to array */ |
| 144 | memcpy(&channels[i], kchan->channel, sizeof(struct lttng_channel)); |
| 145 | channels[i].enabled = kchan->enabled; |
| 146 | i++; |
| 147 | } |
| 148 | } |
| 149 | break; |
| 150 | case LTTNG_DOMAIN_UST: |
| 151 | { |
| 152 | struct lttng_ht_iter iter; |
| 153 | struct ltt_ust_channel *uchan; |
| 154 | |
| 155 | rcu_read_lock(); |
| 156 | cds_lfht_for_each_entry(session->ust_session->domain_global.channels->ht, |
| 157 | &iter.iter, uchan, node.node) { |
| 158 | strncpy(channels[i].name, uchan->name, LTTNG_SYMBOL_NAME_LEN); |
| 159 | channels[i].attr.overwrite = uchan->attr.overwrite; |
| 160 | channels[i].attr.subbuf_size = uchan->attr.subbuf_size; |
| 161 | channels[i].attr.num_subbuf = uchan->attr.num_subbuf; |
| 162 | channels[i].attr.switch_timer_interval = |
| 163 | uchan->attr.switch_timer_interval; |
| 164 | channels[i].attr.read_timer_interval = |
| 165 | uchan->attr.read_timer_interval; |
| 166 | channels[i].enabled = uchan->enabled; |
| 167 | switch (uchan->attr.output) { |
| 168 | case LTTNG_UST_MMAP: |
| 169 | default: |
| 170 | channels[i].attr.output = LTTNG_EVENT_MMAP; |
| 171 | break; |
| 172 | } |
| 173 | i++; |
| 174 | } |
| 175 | rcu_read_unlock(); |
| 176 | break; |
| 177 | } |
| 178 | default: |
| 179 | break; |
| 180 | } |
| 181 | } |
| 182 | |
| 183 | /* |
| 184 | * Create a list of ust global domain events. |
| 185 | */ |
| 186 | static int list_lttng_ust_global_events(char *channel_name, |
| 187 | struct ltt_ust_domain_global *ust_global, struct lttng_event **events) |
| 188 | { |
| 189 | int i = 0, ret = 0; |
| 190 | unsigned int nb_event = 0; |
| 191 | struct lttng_ht_iter iter; |
| 192 | struct lttng_ht_node_str *node; |
| 193 | struct ltt_ust_channel *uchan; |
| 194 | struct ltt_ust_event *uevent; |
| 195 | struct lttng_event *tmp; |
| 196 | |
| 197 | DBG("Listing UST global events for channel %s", channel_name); |
| 198 | |
| 199 | rcu_read_lock(); |
| 200 | |
| 201 | lttng_ht_lookup(ust_global->channels, (void *)channel_name, &iter); |
| 202 | node = lttng_ht_iter_get_node_str(&iter); |
| 203 | if (node == NULL) { |
| 204 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; |
| 205 | goto error; |
| 206 | } |
| 207 | |
| 208 | uchan = caa_container_of(&node->node, struct ltt_ust_channel, node.node); |
| 209 | |
| 210 | nb_event += lttng_ht_get_count(uchan->events); |
| 211 | |
| 212 | if (nb_event == 0) { |
| 213 | ret = nb_event; |
| 214 | goto error; |
| 215 | } |
| 216 | |
| 217 | DBG3("Listing UST global %d events", nb_event); |
| 218 | |
| 219 | tmp = zmalloc(nb_event * sizeof(struct lttng_event)); |
| 220 | if (tmp == NULL) { |
| 221 | ret = LTTNG_ERR_FATAL; |
| 222 | goto error; |
| 223 | } |
| 224 | |
| 225 | cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) { |
| 226 | strncpy(tmp[i].name, uevent->attr.name, LTTNG_SYMBOL_NAME_LEN); |
| 227 | tmp[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; |
| 228 | tmp[i].enabled = uevent->enabled; |
| 229 | |
| 230 | switch (uevent->attr.instrumentation) { |
| 231 | case LTTNG_UST_TRACEPOINT: |
| 232 | tmp[i].type = LTTNG_EVENT_TRACEPOINT; |
| 233 | break; |
| 234 | case LTTNG_UST_PROBE: |
| 235 | tmp[i].type = LTTNG_EVENT_PROBE; |
| 236 | break; |
| 237 | case LTTNG_UST_FUNCTION: |
| 238 | tmp[i].type = LTTNG_EVENT_FUNCTION; |
| 239 | break; |
| 240 | } |
| 241 | |
| 242 | tmp[i].loglevel = uevent->attr.loglevel; |
| 243 | switch (uevent->attr.loglevel_type) { |
| 244 | case LTTNG_UST_LOGLEVEL_ALL: |
| 245 | tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL; |
| 246 | break; |
| 247 | case LTTNG_UST_LOGLEVEL_RANGE: |
| 248 | tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_RANGE; |
| 249 | break; |
| 250 | case LTTNG_UST_LOGLEVEL_SINGLE: |
| 251 | tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_SINGLE; |
| 252 | break; |
| 253 | } |
| 254 | if (uevent->filter) { |
| 255 | tmp[i].filter = 1; |
| 256 | } |
| 257 | i++; |
| 258 | } |
| 259 | |
| 260 | ret = nb_event; |
| 261 | *events = tmp; |
| 262 | |
| 263 | error: |
| 264 | rcu_read_unlock(); |
| 265 | return ret; |
| 266 | } |
| 267 | |
| 268 | /* |
| 269 | * Fill lttng_event array of all kernel events in the channel. |
| 270 | */ |
| 271 | static int list_lttng_kernel_events(char *channel_name, |
| 272 | struct ltt_kernel_session *kernel_session, struct lttng_event **events) |
| 273 | { |
| 274 | int i = 0, ret; |
| 275 | unsigned int nb_event; |
| 276 | struct ltt_kernel_event *event; |
| 277 | struct ltt_kernel_channel *kchan; |
| 278 | |
| 279 | kchan = trace_kernel_get_channel_by_name(channel_name, kernel_session); |
| 280 | if (kchan == NULL) { |
| 281 | ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND; |
| 282 | goto error; |
| 283 | } |
| 284 | |
| 285 | nb_event = kchan->event_count; |
| 286 | |
| 287 | DBG("Listing events for channel %s", kchan->channel->name); |
| 288 | |
| 289 | if (nb_event == 0) { |
| 290 | goto end; |
| 291 | } |
| 292 | |
| 293 | *events = zmalloc(nb_event * sizeof(struct lttng_event)); |
| 294 | if (*events == NULL) { |
| 295 | ret = LTTNG_ERR_FATAL; |
| 296 | goto error; |
| 297 | } |
| 298 | |
| 299 | /* Kernel channels */ |
| 300 | cds_list_for_each_entry(event, &kchan->events_list.head , list) { |
| 301 | strncpy((*events)[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN); |
| 302 | (*events)[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; |
| 303 | (*events)[i].enabled = event->enabled; |
| 304 | |
| 305 | switch (event->event->instrumentation) { |
| 306 | case LTTNG_KERNEL_TRACEPOINT: |
| 307 | (*events)[i].type = LTTNG_EVENT_TRACEPOINT; |
| 308 | break; |
| 309 | case LTTNG_KERNEL_KRETPROBE: |
| 310 | (*events)[i].type = LTTNG_EVENT_FUNCTION; |
| 311 | memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe, |
| 312 | sizeof(struct lttng_kernel_kprobe)); |
| 313 | break; |
| 314 | case LTTNG_KERNEL_KPROBE: |
| 315 | (*events)[i].type = LTTNG_EVENT_PROBE; |
| 316 | memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe, |
| 317 | sizeof(struct lttng_kernel_kprobe)); |
| 318 | break; |
| 319 | case LTTNG_KERNEL_FUNCTION: |
| 320 | (*events)[i].type = LTTNG_EVENT_FUNCTION; |
| 321 | memcpy(&((*events)[i].attr.ftrace), &event->event->u.ftrace, |
| 322 | sizeof(struct lttng_kernel_function)); |
| 323 | break; |
| 324 | case LTTNG_KERNEL_NOOP: |
| 325 | (*events)[i].type = LTTNG_EVENT_NOOP; |
| 326 | break; |
| 327 | case LTTNG_KERNEL_SYSCALL: |
| 328 | (*events)[i].type = LTTNG_EVENT_SYSCALL; |
| 329 | break; |
| 330 | case LTTNG_KERNEL_ALL: |
| 331 | assert(0); |
| 332 | break; |
| 333 | } |
| 334 | i++; |
| 335 | } |
| 336 | |
| 337 | end: |
| 338 | return nb_event; |
| 339 | |
| 340 | error: |
| 341 | /* Negate the error code to differentiate the size from an error */ |
| 342 | return -ret; |
| 343 | } |
| 344 | |
| 345 | /* |
| 346 | * Add URI so the consumer output object. Set the correct path depending on the |
| 347 | * domain adding the default trace directory. |
| 348 | */ |
| 349 | static int add_uri_to_consumer(struct consumer_output *consumer, |
| 350 | struct lttng_uri *uri, int domain, const char *session_name) |
| 351 | { |
| 352 | int ret = LTTNG_OK; |
| 353 | const char *default_trace_dir; |
| 354 | |
| 355 | assert(uri); |
| 356 | |
| 357 | if (consumer == NULL) { |
| 358 | DBG("No consumer detected. Don't add URI. Stopping."); |
| 359 | ret = LTTNG_ERR_NO_CONSUMER; |
| 360 | goto error; |
| 361 | } |
| 362 | |
| 363 | switch (domain) { |
| 364 | case LTTNG_DOMAIN_KERNEL: |
| 365 | default_trace_dir = DEFAULT_KERNEL_TRACE_DIR; |
| 366 | break; |
| 367 | case LTTNG_DOMAIN_UST: |
| 368 | default_trace_dir = DEFAULT_UST_TRACE_DIR; |
| 369 | break; |
| 370 | default: |
| 371 | /* |
| 372 | * This case is possible is we try to add the URI to the global tracing |
| 373 | * session consumer object which in this case there is no subdir. |
| 374 | */ |
| 375 | default_trace_dir = ""; |
| 376 | } |
| 377 | |
| 378 | switch (uri->dtype) { |
| 379 | case LTTNG_DST_IPV4: |
| 380 | case LTTNG_DST_IPV6: |
| 381 | DBG2("Setting network URI to consumer"); |
| 382 | |
| 383 | if (consumer->type == CONSUMER_DST_NET) { |
| 384 | if ((uri->stype == LTTNG_STREAM_CONTROL && |
| 385 | consumer->dst.net.control_isset) || |
| 386 | (uri->stype == LTTNG_STREAM_DATA && |
| 387 | consumer->dst.net.data_isset)) { |
| 388 | ret = LTTNG_ERR_URL_EXIST; |
| 389 | goto error; |
| 390 | } |
| 391 | } else { |
| 392 | memset(&consumer->dst.net, 0, sizeof(consumer->dst.net)); |
| 393 | } |
| 394 | |
| 395 | consumer->type = CONSUMER_DST_NET; |
| 396 | |
| 397 | /* Set URI into consumer output object */ |
| 398 | ret = consumer_set_network_uri(consumer, uri); |
| 399 | if (ret < 0) { |
| 400 | ret = -ret; |
| 401 | goto error; |
| 402 | } else if (ret == 1) { |
| 403 | /* |
| 404 | * URI was the same in the consumer so we do not append the subdir |
| 405 | * again so to not duplicate output dir. |
| 406 | */ |
| 407 | goto error; |
| 408 | } |
| 409 | |
| 410 | if (uri->stype == LTTNG_STREAM_CONTROL && strlen(uri->subdir) == 0) { |
| 411 | ret = consumer_set_subdir(consumer, session_name); |
| 412 | if (ret < 0) { |
| 413 | ret = LTTNG_ERR_FATAL; |
| 414 | goto error; |
| 415 | } |
| 416 | } |
| 417 | |
| 418 | if (uri->stype == LTTNG_STREAM_CONTROL) { |
| 419 | /* On a new subdir, reappend the default trace dir. */ |
| 420 | strncat(consumer->subdir, default_trace_dir, |
| 421 | sizeof(consumer->subdir) - strlen(consumer->subdir) - 1); |
| 422 | DBG3("Append domain trace name to subdir %s", consumer->subdir); |
| 423 | } |
| 424 | |
| 425 | break; |
| 426 | case LTTNG_DST_PATH: |
| 427 | DBG2("Setting trace directory path from URI to %s", uri->dst.path); |
| 428 | memset(consumer->dst.trace_path, 0, |
| 429 | sizeof(consumer->dst.trace_path)); |
| 430 | strncpy(consumer->dst.trace_path, uri->dst.path, |
| 431 | sizeof(consumer->dst.trace_path)); |
| 432 | /* Append default trace dir */ |
| 433 | strncat(consumer->dst.trace_path, default_trace_dir, |
| 434 | sizeof(consumer->dst.trace_path) - |
| 435 | strlen(consumer->dst.trace_path) - 1); |
| 436 | /* Flag consumer as local. */ |
| 437 | consumer->type = CONSUMER_DST_LOCAL; |
| 438 | break; |
| 439 | } |
| 440 | |
| 441 | ret = LTTNG_OK; |
| 442 | |
| 443 | error: |
| 444 | return ret; |
| 445 | } |
| 446 | |
| 447 | /* |
| 448 | * Init tracing by creating trace directory and sending fds kernel consumer. |
| 449 | */ |
| 450 | static int init_kernel_tracing(struct ltt_kernel_session *session) |
| 451 | { |
| 452 | int ret = 0; |
| 453 | struct lttng_ht_iter iter; |
| 454 | struct consumer_socket *socket; |
| 455 | |
| 456 | assert(session); |
| 457 | |
| 458 | rcu_read_lock(); |
| 459 | |
| 460 | if (session->consumer_fds_sent == 0 && session->consumer != NULL) { |
| 461 | cds_lfht_for_each_entry(session->consumer->socks->ht, &iter.iter, |
| 462 | socket, node.node) { |
| 463 | /* Code flow error */ |
| 464 | assert(socket->fd >= 0); |
| 465 | |
| 466 | pthread_mutex_lock(socket->lock); |
| 467 | ret = kernel_consumer_send_session(socket, session); |
| 468 | pthread_mutex_unlock(socket->lock); |
| 469 | if (ret < 0) { |
| 470 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; |
| 471 | goto error; |
| 472 | } |
| 473 | } |
| 474 | } |
| 475 | |
| 476 | error: |
| 477 | rcu_read_unlock(); |
| 478 | return ret; |
| 479 | } |
| 480 | |
| 481 | /* |
| 482 | * Create a socket to the relayd using the URI. |
| 483 | * |
| 484 | * On success, the relayd_sock pointer is set to the created socket. |
| 485 | * Else, it's stays untouched and a lttcomm error code is returned. |
| 486 | */ |
| 487 | static int create_connect_relayd(struct lttng_uri *uri, |
| 488 | struct lttcomm_relayd_sock **relayd_sock) |
| 489 | { |
| 490 | int ret; |
| 491 | struct lttcomm_relayd_sock *rsock; |
| 492 | |
| 493 | rsock = lttcomm_alloc_relayd_sock(uri, RELAYD_VERSION_COMM_MAJOR, |
| 494 | RELAYD_VERSION_COMM_MINOR); |
| 495 | if (!rsock) { |
| 496 | ret = LTTNG_ERR_FATAL; |
| 497 | goto error; |
| 498 | } |
| 499 | |
| 500 | /* |
| 501 | * Connect to relayd so we can proceed with a session creation. This call |
| 502 | * can possibly block for an arbitrary amount of time to set the health |
| 503 | * state to be in poll execution. |
| 504 | */ |
| 505 | health_poll_entry(); |
| 506 | ret = relayd_connect(rsock); |
| 507 | health_poll_exit(); |
| 508 | if (ret < 0) { |
| 509 | ERR("Unable to reach lttng-relayd"); |
| 510 | ret = LTTNG_ERR_RELAYD_CONNECT_FAIL; |
| 511 | goto free_sock; |
| 512 | } |
| 513 | |
| 514 | /* Create socket for control stream. */ |
| 515 | if (uri->stype == LTTNG_STREAM_CONTROL) { |
| 516 | DBG3("Creating relayd stream socket from URI"); |
| 517 | |
| 518 | /* Check relayd version */ |
| 519 | ret = relayd_version_check(rsock); |
| 520 | if (ret < 0) { |
| 521 | ret = LTTNG_ERR_RELAYD_VERSION_FAIL; |
| 522 | goto close_sock; |
| 523 | } |
| 524 | } else if (uri->stype == LTTNG_STREAM_DATA) { |
| 525 | DBG3("Creating relayd data socket from URI"); |
| 526 | } else { |
| 527 | /* Command is not valid */ |
| 528 | ERR("Relayd invalid stream type: %d", uri->stype); |
| 529 | ret = LTTNG_ERR_INVALID; |
| 530 | goto close_sock; |
| 531 | } |
| 532 | |
| 533 | *relayd_sock = rsock; |
| 534 | |
| 535 | return LTTNG_OK; |
| 536 | |
| 537 | close_sock: |
| 538 | /* The returned value is not useful since we are on an error path. */ |
| 539 | (void) relayd_close(rsock); |
| 540 | free_sock: |
| 541 | free(rsock); |
| 542 | error: |
| 543 | return ret; |
| 544 | } |
| 545 | |
| 546 | /* |
| 547 | * Connect to the relayd using URI and send the socket to the right consumer. |
| 548 | */ |
| 549 | static int send_consumer_relayd_socket(int domain, struct ltt_session *session, |
| 550 | struct lttng_uri *relayd_uri, struct consumer_output *consumer, |
| 551 | struct consumer_socket *consumer_sock) |
| 552 | { |
| 553 | int ret; |
| 554 | struct lttcomm_relayd_sock *rsock = NULL; |
| 555 | |
| 556 | /* Connect to relayd and make version check if uri is the control. */ |
| 557 | ret = create_connect_relayd(relayd_uri, &rsock); |
| 558 | if (ret != LTTNG_OK) { |
| 559 | goto error; |
| 560 | } |
| 561 | assert(rsock); |
| 562 | |
| 563 | /* If the control socket is connected, network session is ready */ |
| 564 | if (relayd_uri->stype == LTTNG_STREAM_CONTROL) { |
| 565 | session->net_handle = 1; |
| 566 | } |
| 567 | |
| 568 | /* Set the network sequence index if not set. */ |
| 569 | if (consumer->net_seq_index == (uint64_t) -1ULL) { |
| 570 | pthread_mutex_lock(&relayd_net_seq_idx_lock); |
| 571 | /* |
| 572 | * Increment net_seq_idx because we are about to transfer the |
| 573 | * new relayd socket to the consumer. |
| 574 | * Assign unique key so the consumer can match streams. |
| 575 | */ |
| 576 | consumer->net_seq_index = ++relayd_net_seq_idx; |
| 577 | pthread_mutex_unlock(&relayd_net_seq_idx_lock); |
| 578 | } |
| 579 | |
| 580 | /* Send relayd socket to consumer. */ |
| 581 | ret = consumer_send_relayd_socket(consumer_sock, rsock, consumer, |
| 582 | relayd_uri->stype, session->id); |
| 583 | if (ret < 0) { |
| 584 | ret = LTTNG_ERR_ENABLE_CONSUMER_FAIL; |
| 585 | goto close_sock; |
| 586 | } |
| 587 | |
| 588 | /* Flag that the corresponding socket was sent. */ |
| 589 | if (relayd_uri->stype == LTTNG_STREAM_CONTROL) { |
| 590 | consumer_sock->control_sock_sent = 1; |
| 591 | } else if (relayd_uri->stype == LTTNG_STREAM_DATA) { |
| 592 | consumer_sock->data_sock_sent = 1; |
| 593 | } |
| 594 | |
| 595 | ret = LTTNG_OK; |
| 596 | |
| 597 | /* |
| 598 | * Close socket which was dup on the consumer side. The session daemon does |
| 599 | * NOT keep track of the relayd socket(s) once transfer to the consumer. |
| 600 | */ |
| 601 | |
| 602 | close_sock: |
| 603 | (void) relayd_close(rsock); |
| 604 | free(rsock); |
| 605 | |
| 606 | error: |
| 607 | if (ret != LTTNG_OK) { |
| 608 | /* |
| 609 | * The consumer output for this session should not be used anymore |
| 610 | * since the relayd connection failed thus making any tracing or/and |
| 611 | * streaming not usable. |
| 612 | */ |
| 613 | consumer->enabled = 0; |
| 614 | } |
| 615 | return ret; |
| 616 | } |
| 617 | |
| 618 | /* |
| 619 | * Send both relayd sockets to a specific consumer and domain. This is a |
| 620 | * helper function to facilitate sending the information to the consumer for a |
| 621 | * session. |
| 622 | */ |
| 623 | static int send_consumer_relayd_sockets(int domain, |
| 624 | struct ltt_session *session, struct consumer_output *consumer, |
| 625 | struct consumer_socket *sock) |
| 626 | { |
| 627 | int ret = LTTNG_OK; |
| 628 | |
| 629 | assert(session); |
| 630 | assert(consumer); |
| 631 | |
| 632 | /* Sending control relayd socket. */ |
| 633 | if (!sock->control_sock_sent) { |
| 634 | ret = send_consumer_relayd_socket(domain, session, |
| 635 | &consumer->dst.net.control, consumer, sock); |
| 636 | if (ret != LTTNG_OK) { |
| 637 | goto error; |
| 638 | } |
| 639 | } |
| 640 | |
| 641 | /* Sending data relayd socket. */ |
| 642 | if (!sock->data_sock_sent) { |
| 643 | ret = send_consumer_relayd_socket(domain, session, |
| 644 | &consumer->dst.net.data, consumer, sock); |
| 645 | if (ret != LTTNG_OK) { |
| 646 | goto error; |
| 647 | } |
| 648 | } |
| 649 | |
| 650 | error: |
| 651 | return ret; |
| 652 | } |
| 653 | |
| 654 | /* |
| 655 | * Setup relayd connections for a tracing session. First creates the socket to |
| 656 | * the relayd and send them to the right domain consumer. Consumer type MUST be |
| 657 | * network. |
| 658 | */ |
| 659 | int cmd_setup_relayd(struct ltt_session *session) |
| 660 | { |
| 661 | int ret = LTTNG_OK; |
| 662 | struct ltt_ust_session *usess; |
| 663 | struct ltt_kernel_session *ksess; |
| 664 | struct consumer_socket *socket; |
| 665 | struct lttng_ht_iter iter; |
| 666 | |
| 667 | assert(session); |
| 668 | |
| 669 | usess = session->ust_session; |
| 670 | ksess = session->kernel_session; |
| 671 | |
| 672 | DBG("Setting relayd for session %s", session->name); |
| 673 | |
| 674 | rcu_read_lock(); |
| 675 | |
| 676 | if (usess && usess->consumer && usess->consumer->type == CONSUMER_DST_NET |
| 677 | && usess->consumer->enabled) { |
| 678 | /* For each consumer socket, send relayd sockets */ |
| 679 | cds_lfht_for_each_entry(usess->consumer->socks->ht, &iter.iter, |
| 680 | socket, node.node) { |
| 681 | /* Code flow error */ |
| 682 | assert(socket->fd >= 0); |
| 683 | |
| 684 | pthread_mutex_lock(socket->lock); |
| 685 | ret = send_consumer_relayd_sockets(LTTNG_DOMAIN_UST, session, |
| 686 | usess->consumer, socket); |
| 687 | pthread_mutex_unlock(socket->lock); |
| 688 | if (ret != LTTNG_OK) { |
| 689 | goto error; |
| 690 | } |
| 691 | } |
| 692 | } |
| 693 | |
| 694 | if (ksess && ksess->consumer && ksess->consumer->type == CONSUMER_DST_NET |
| 695 | && ksess->consumer->enabled) { |
| 696 | cds_lfht_for_each_entry(ksess->consumer->socks->ht, &iter.iter, |
| 697 | socket, node.node) { |
| 698 | /* Code flow error */ |
| 699 | assert(socket->fd >= 0); |
| 700 | |
| 701 | pthread_mutex_lock(socket->lock); |
| 702 | ret = send_consumer_relayd_sockets(LTTNG_DOMAIN_KERNEL, session, |
| 703 | ksess->consumer, socket); |
| 704 | pthread_mutex_unlock(socket->lock); |
| 705 | if (ret != LTTNG_OK) { |
| 706 | goto error; |
| 707 | } |
| 708 | } |
| 709 | } |
| 710 | |
| 711 | error: |
| 712 | rcu_read_unlock(); |
| 713 | return ret; |
| 714 | } |
| 715 | |
| 716 | /* |
| 717 | * Start a kernel session by opening all necessary streams. |
| 718 | */ |
| 719 | static int start_kernel_session(struct ltt_kernel_session *ksess, int wpipe) |
| 720 | { |
| 721 | int ret; |
| 722 | struct ltt_kernel_channel *kchan; |
| 723 | |
| 724 | /* Open kernel metadata */ |
| 725 | if (ksess->metadata == NULL) { |
| 726 | ret = kernel_open_metadata(ksess); |
| 727 | if (ret < 0) { |
| 728 | ret = LTTNG_ERR_KERN_META_FAIL; |
| 729 | goto error; |
| 730 | } |
| 731 | } |
| 732 | |
| 733 | /* Open kernel metadata stream */ |
| 734 | if (ksess->metadata_stream_fd < 0) { |
| 735 | ret = kernel_open_metadata_stream(ksess); |
| 736 | if (ret < 0) { |
| 737 | ERR("Kernel create metadata stream failed"); |
| 738 | ret = LTTNG_ERR_KERN_STREAM_FAIL; |
| 739 | goto error; |
| 740 | } |
| 741 | } |
| 742 | |
| 743 | /* For each channel */ |
| 744 | cds_list_for_each_entry(kchan, &ksess->channel_list.head, list) { |
| 745 | if (kchan->stream_count == 0) { |
| 746 | ret = kernel_open_channel_stream(kchan); |
| 747 | if (ret < 0) { |
| 748 | ret = LTTNG_ERR_KERN_STREAM_FAIL; |
| 749 | goto error; |
| 750 | } |
| 751 | /* Update the stream global counter */ |
| 752 | ksess->stream_count_global += ret; |
| 753 | } |
| 754 | } |
| 755 | |
| 756 | /* Setup kernel consumer socket and send fds to it */ |
| 757 | ret = init_kernel_tracing(ksess); |
| 758 | if (ret != 0) { |
| 759 | ret = LTTNG_ERR_KERN_START_FAIL; |
| 760 | goto error; |
| 761 | } |
| 762 | |
| 763 | /* This start the kernel tracing */ |
| 764 | ret = kernel_start_session(ksess); |
| 765 | if (ret < 0) { |
| 766 | ret = LTTNG_ERR_KERN_START_FAIL; |
| 767 | goto error; |
| 768 | } |
| 769 | |
| 770 | /* Quiescent wait after starting trace */ |
| 771 | kernel_wait_quiescent(kernel_tracer_fd); |
| 772 | |
| 773 | ksess->started = 1; |
| 774 | |
| 775 | ret = LTTNG_OK; |
| 776 | |
| 777 | error: |
| 778 | return ret; |
| 779 | } |
| 780 | |
| 781 | /* |
| 782 | * Command LTTNG_DISABLE_CHANNEL processed by the client thread. |
| 783 | */ |
| 784 | int cmd_disable_channel(struct ltt_session *session, int domain, |
| 785 | char *channel_name) |
| 786 | { |
| 787 | int ret; |
| 788 | struct ltt_ust_session *usess; |
| 789 | |
| 790 | usess = session->ust_session; |
| 791 | |
| 792 | rcu_read_lock(); |
| 793 | |
| 794 | switch (domain) { |
| 795 | case LTTNG_DOMAIN_KERNEL: |
| 796 | { |
| 797 | ret = channel_kernel_disable(session->kernel_session, |
| 798 | channel_name); |
| 799 | if (ret != LTTNG_OK) { |
| 800 | goto error; |
| 801 | } |
| 802 | |
| 803 | kernel_wait_quiescent(kernel_tracer_fd); |
| 804 | break; |
| 805 | } |
| 806 | case LTTNG_DOMAIN_UST: |
| 807 | { |
| 808 | struct ltt_ust_channel *uchan; |
| 809 | struct lttng_ht *chan_ht; |
| 810 | |
| 811 | chan_ht = usess->domain_global.channels; |
| 812 | |
| 813 | uchan = trace_ust_find_channel_by_name(chan_ht, channel_name); |
| 814 | if (uchan == NULL) { |
| 815 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; |
| 816 | goto error; |
| 817 | } |
| 818 | |
| 819 | ret = channel_ust_disable(usess, uchan); |
| 820 | if (ret != LTTNG_OK) { |
| 821 | goto error; |
| 822 | } |
| 823 | break; |
| 824 | } |
| 825 | #if 0 |
| 826 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: |
| 827 | case LTTNG_DOMAIN_UST_EXEC_NAME: |
| 828 | case LTTNG_DOMAIN_UST_PID: |
| 829 | #endif |
| 830 | default: |
| 831 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; |
| 832 | goto error; |
| 833 | } |
| 834 | |
| 835 | ret = LTTNG_OK; |
| 836 | |
| 837 | error: |
| 838 | rcu_read_unlock(); |
| 839 | return ret; |
| 840 | } |
| 841 | |
| 842 | /* |
| 843 | * Command LTTNG_ENABLE_CHANNEL processed by the client thread. |
| 844 | * |
| 845 | * The wpipe arguments is used as a notifier for the kernel thread. |
| 846 | */ |
| 847 | int cmd_enable_channel(struct ltt_session *session, |
| 848 | struct lttng_domain *domain, struct lttng_channel *attr, int wpipe) |
| 849 | { |
| 850 | int ret; |
| 851 | struct ltt_ust_session *usess = session->ust_session; |
| 852 | struct lttng_ht *chan_ht; |
| 853 | |
| 854 | assert(session); |
| 855 | assert(attr); |
| 856 | assert(domain); |
| 857 | |
| 858 | DBG("Enabling channel %s for session %s", attr->name, session->name); |
| 859 | |
| 860 | /* |
| 861 | * Don't try to enable a channel if the session has been started at |
| 862 | * some point in time before. The tracer does not allow it. |
| 863 | */ |
| 864 | if (session->started) { |
| 865 | ret = LTTNG_ERR_TRACE_ALREADY_STARTED; |
| 866 | goto error; |
| 867 | } |
| 868 | |
| 869 | rcu_read_lock(); |
| 870 | |
| 871 | switch (domain->type) { |
| 872 | case LTTNG_DOMAIN_KERNEL: |
| 873 | { |
| 874 | struct ltt_kernel_channel *kchan; |
| 875 | |
| 876 | kchan = trace_kernel_get_channel_by_name(attr->name, |
| 877 | session->kernel_session); |
| 878 | if (kchan == NULL) { |
| 879 | ret = channel_kernel_create(session->kernel_session, attr, wpipe); |
| 880 | } else { |
| 881 | ret = channel_kernel_enable(session->kernel_session, kchan); |
| 882 | } |
| 883 | |
| 884 | if (ret != LTTNG_OK) { |
| 885 | goto error; |
| 886 | } |
| 887 | |
| 888 | kernel_wait_quiescent(kernel_tracer_fd); |
| 889 | break; |
| 890 | } |
| 891 | case LTTNG_DOMAIN_UST: |
| 892 | { |
| 893 | struct ltt_ust_channel *uchan; |
| 894 | |
| 895 | chan_ht = usess->domain_global.channels; |
| 896 | |
| 897 | uchan = trace_ust_find_channel_by_name(chan_ht, attr->name); |
| 898 | if (uchan == NULL) { |
| 899 | ret = channel_ust_create(usess, attr, domain->buf_type); |
| 900 | } else { |
| 901 | ret = channel_ust_enable(usess, uchan); |
| 902 | } |
| 903 | break; |
| 904 | } |
| 905 | default: |
| 906 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; |
| 907 | goto error; |
| 908 | } |
| 909 | |
| 910 | error: |
| 911 | rcu_read_unlock(); |
| 912 | return ret; |
| 913 | } |
| 914 | |
| 915 | |
| 916 | /* |
| 917 | * Command LTTNG_DISABLE_EVENT processed by the client thread. |
| 918 | */ |
| 919 | int cmd_disable_event(struct ltt_session *session, int domain, |
| 920 | char *channel_name, char *event_name) |
| 921 | { |
| 922 | int ret; |
| 923 | |
| 924 | rcu_read_lock(); |
| 925 | |
| 926 | switch (domain) { |
| 927 | case LTTNG_DOMAIN_KERNEL: |
| 928 | { |
| 929 | struct ltt_kernel_channel *kchan; |
| 930 | struct ltt_kernel_session *ksess; |
| 931 | |
| 932 | ksess = session->kernel_session; |
| 933 | |
| 934 | kchan = trace_kernel_get_channel_by_name(channel_name, ksess); |
| 935 | if (kchan == NULL) { |
| 936 | ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND; |
| 937 | goto error; |
| 938 | } |
| 939 | |
| 940 | ret = event_kernel_disable_tracepoint(kchan, event_name); |
| 941 | if (ret != LTTNG_OK) { |
| 942 | goto error; |
| 943 | } |
| 944 | |
| 945 | kernel_wait_quiescent(kernel_tracer_fd); |
| 946 | break; |
| 947 | } |
| 948 | case LTTNG_DOMAIN_UST: |
| 949 | { |
| 950 | struct ltt_ust_channel *uchan; |
| 951 | struct ltt_ust_session *usess; |
| 952 | |
| 953 | usess = session->ust_session; |
| 954 | |
| 955 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, |
| 956 | channel_name); |
| 957 | if (uchan == NULL) { |
| 958 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; |
| 959 | goto error; |
| 960 | } |
| 961 | |
| 962 | ret = event_ust_disable_tracepoint(usess, uchan, event_name); |
| 963 | if (ret != LTTNG_OK) { |
| 964 | goto error; |
| 965 | } |
| 966 | |
| 967 | DBG3("Disable UST event %s in channel %s completed", event_name, |
| 968 | channel_name); |
| 969 | break; |
| 970 | } |
| 971 | #if 0 |
| 972 | case LTTNG_DOMAIN_UST_EXEC_NAME: |
| 973 | case LTTNG_DOMAIN_UST_PID: |
| 974 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: |
| 975 | #endif |
| 976 | default: |
| 977 | ret = LTTNG_ERR_UND; |
| 978 | goto error; |
| 979 | } |
| 980 | |
| 981 | ret = LTTNG_OK; |
| 982 | |
| 983 | error: |
| 984 | rcu_read_unlock(); |
| 985 | return ret; |
| 986 | } |
| 987 | |
| 988 | /* |
| 989 | * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread. |
| 990 | */ |
| 991 | int cmd_disable_event_all(struct ltt_session *session, int domain, |
| 992 | char *channel_name) |
| 993 | { |
| 994 | int ret; |
| 995 | |
| 996 | rcu_read_lock(); |
| 997 | |
| 998 | switch (domain) { |
| 999 | case LTTNG_DOMAIN_KERNEL: |
| 1000 | { |
| 1001 | struct ltt_kernel_session *ksess; |
| 1002 | struct ltt_kernel_channel *kchan; |
| 1003 | |
| 1004 | ksess = session->kernel_session; |
| 1005 | |
| 1006 | kchan = trace_kernel_get_channel_by_name(channel_name, ksess); |
| 1007 | if (kchan == NULL) { |
| 1008 | ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND; |
| 1009 | goto error; |
| 1010 | } |
| 1011 | |
| 1012 | ret = event_kernel_disable_all(kchan); |
| 1013 | if (ret != LTTNG_OK) { |
| 1014 | goto error; |
| 1015 | } |
| 1016 | |
| 1017 | kernel_wait_quiescent(kernel_tracer_fd); |
| 1018 | break; |
| 1019 | } |
| 1020 | case LTTNG_DOMAIN_UST: |
| 1021 | { |
| 1022 | struct ltt_ust_session *usess; |
| 1023 | struct ltt_ust_channel *uchan; |
| 1024 | |
| 1025 | usess = session->ust_session; |
| 1026 | |
| 1027 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, |
| 1028 | channel_name); |
| 1029 | if (uchan == NULL) { |
| 1030 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; |
| 1031 | goto error; |
| 1032 | } |
| 1033 | |
| 1034 | ret = event_ust_disable_all_tracepoints(usess, uchan); |
| 1035 | if (ret != 0) { |
| 1036 | goto error; |
| 1037 | } |
| 1038 | |
| 1039 | DBG3("Disable all UST events in channel %s completed", channel_name); |
| 1040 | |
| 1041 | break; |
| 1042 | } |
| 1043 | #if 0 |
| 1044 | case LTTNG_DOMAIN_UST_EXEC_NAME: |
| 1045 | case LTTNG_DOMAIN_UST_PID: |
| 1046 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: |
| 1047 | #endif |
| 1048 | default: |
| 1049 | ret = LTTNG_ERR_UND; |
| 1050 | goto error; |
| 1051 | } |
| 1052 | |
| 1053 | ret = LTTNG_OK; |
| 1054 | |
| 1055 | error: |
| 1056 | rcu_read_unlock(); |
| 1057 | return ret; |
| 1058 | } |
| 1059 | |
| 1060 | /* |
| 1061 | * Command LTTNG_ADD_CONTEXT processed by the client thread. |
| 1062 | */ |
| 1063 | int cmd_add_context(struct ltt_session *session, int domain, |
| 1064 | char *channel_name, struct lttng_event_context *ctx, int kwpipe) |
| 1065 | { |
| 1066 | int ret, chan_kern_created = 0, chan_ust_created = 0; |
| 1067 | |
| 1068 | switch (domain) { |
| 1069 | case LTTNG_DOMAIN_KERNEL: |
| 1070 | assert(session->kernel_session); |
| 1071 | |
| 1072 | if (session->kernel_session->channel_count == 0) { |
| 1073 | /* Create default channel */ |
| 1074 | ret = channel_kernel_create(session->kernel_session, NULL, kwpipe); |
| 1075 | if (ret != LTTNG_OK) { |
| 1076 | goto error; |
| 1077 | } |
| 1078 | chan_kern_created = 1; |
| 1079 | } |
| 1080 | |
| 1081 | /* Add kernel context to kernel tracer */ |
| 1082 | ret = context_kernel_add(session->kernel_session, ctx, channel_name); |
| 1083 | if (ret != LTTNG_OK) { |
| 1084 | goto error; |
| 1085 | } |
| 1086 | break; |
| 1087 | case LTTNG_DOMAIN_UST: |
| 1088 | { |
| 1089 | struct ltt_ust_session *usess = session->ust_session; |
| 1090 | assert(usess); |
| 1091 | |
| 1092 | unsigned int chan_count = |
| 1093 | lttng_ht_get_count(usess->domain_global.channels); |
| 1094 | if (chan_count == 0) { |
| 1095 | struct lttng_channel *attr; |
| 1096 | /* Create default channel */ |
| 1097 | attr = channel_new_default_attr(domain, usess->buffer_type); |
| 1098 | if (attr == NULL) { |
| 1099 | ret = LTTNG_ERR_FATAL; |
| 1100 | goto error; |
| 1101 | } |
| 1102 | |
| 1103 | ret = channel_ust_create(usess, attr, usess->buffer_type); |
| 1104 | if (ret != LTTNG_OK) { |
| 1105 | free(attr); |
| 1106 | goto error; |
| 1107 | } |
| 1108 | free(attr); |
| 1109 | chan_ust_created = 1; |
| 1110 | } |
| 1111 | |
| 1112 | ret = context_ust_add(usess, domain, ctx, channel_name); |
| 1113 | if (ret != LTTNG_OK) { |
| 1114 | goto error; |
| 1115 | } |
| 1116 | break; |
| 1117 | } |
| 1118 | #if 0 |
| 1119 | case LTTNG_DOMAIN_UST_EXEC_NAME: |
| 1120 | case LTTNG_DOMAIN_UST_PID: |
| 1121 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: |
| 1122 | #endif |
| 1123 | default: |
| 1124 | ret = LTTNG_ERR_UND; |
| 1125 | goto error; |
| 1126 | } |
| 1127 | |
| 1128 | return LTTNG_OK; |
| 1129 | |
| 1130 | error: |
| 1131 | if (chan_kern_created) { |
| 1132 | struct ltt_kernel_channel *kchan = |
| 1133 | trace_kernel_get_channel_by_name(DEFAULT_CHANNEL_NAME, |
| 1134 | session->kernel_session); |
| 1135 | /* Created previously, this should NOT fail. */ |
| 1136 | assert(kchan); |
| 1137 | kernel_destroy_channel(kchan); |
| 1138 | } |
| 1139 | |
| 1140 | if (chan_ust_created) { |
| 1141 | struct ltt_ust_channel *uchan = |
| 1142 | trace_ust_find_channel_by_name( |
| 1143 | session->ust_session->domain_global.channels, |
| 1144 | DEFAULT_CHANNEL_NAME); |
| 1145 | /* Created previously, this should NOT fail. */ |
| 1146 | assert(uchan); |
| 1147 | /* Remove from the channel list of the session. */ |
| 1148 | trace_ust_delete_channel(session->ust_session->domain_global.channels, |
| 1149 | uchan); |
| 1150 | trace_ust_destroy_channel(uchan); |
| 1151 | } |
| 1152 | return ret; |
| 1153 | } |
| 1154 | |
| 1155 | /* |
| 1156 | * Command LTTNG_ENABLE_EVENT processed by the client thread. |
| 1157 | */ |
| 1158 | int cmd_enable_event(struct ltt_session *session, struct lttng_domain *domain, |
| 1159 | char *channel_name, struct lttng_event *event, |
| 1160 | struct lttng_filter_bytecode *filter, int wpipe) |
| 1161 | { |
| 1162 | int ret, channel_created = 0; |
| 1163 | struct lttng_channel *attr; |
| 1164 | |
| 1165 | assert(session); |
| 1166 | assert(event); |
| 1167 | assert(channel_name); |
| 1168 | |
| 1169 | rcu_read_lock(); |
| 1170 | |
| 1171 | switch (domain->type) { |
| 1172 | case LTTNG_DOMAIN_KERNEL: |
| 1173 | { |
| 1174 | struct ltt_kernel_channel *kchan; |
| 1175 | |
| 1176 | kchan = trace_kernel_get_channel_by_name(channel_name, |
| 1177 | session->kernel_session); |
| 1178 | if (kchan == NULL) { |
| 1179 | attr = channel_new_default_attr(LTTNG_DOMAIN_KERNEL, |
| 1180 | LTTNG_BUFFER_GLOBAL); |
| 1181 | if (attr == NULL) { |
| 1182 | ret = LTTNG_ERR_FATAL; |
| 1183 | goto error; |
| 1184 | } |
| 1185 | strncpy(attr->name, channel_name, sizeof(attr->name)); |
| 1186 | |
| 1187 | ret = cmd_enable_channel(session, domain, attr, wpipe); |
| 1188 | if (ret != LTTNG_OK) { |
| 1189 | free(attr); |
| 1190 | goto error; |
| 1191 | } |
| 1192 | free(attr); |
| 1193 | |
| 1194 | channel_created = 1; |
| 1195 | } |
| 1196 | |
| 1197 | /* Get the newly created kernel channel pointer */ |
| 1198 | kchan = trace_kernel_get_channel_by_name(channel_name, |
| 1199 | session->kernel_session); |
| 1200 | if (kchan == NULL) { |
| 1201 | /* This sould not happen... */ |
| 1202 | ret = LTTNG_ERR_FATAL; |
| 1203 | goto error; |
| 1204 | } |
| 1205 | |
| 1206 | ret = event_kernel_enable_tracepoint(kchan, event); |
| 1207 | if (ret != LTTNG_OK) { |
| 1208 | if (channel_created) { |
| 1209 | /* Let's not leak a useless channel. */ |
| 1210 | kernel_destroy_channel(kchan); |
| 1211 | } |
| 1212 | goto error; |
| 1213 | } |
| 1214 | |
| 1215 | kernel_wait_quiescent(kernel_tracer_fd); |
| 1216 | break; |
| 1217 | } |
| 1218 | case LTTNG_DOMAIN_UST: |
| 1219 | { |
| 1220 | struct ltt_ust_channel *uchan; |
| 1221 | struct ltt_ust_session *usess = session->ust_session; |
| 1222 | |
| 1223 | assert(usess); |
| 1224 | |
| 1225 | /* Get channel from global UST domain */ |
| 1226 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, |
| 1227 | channel_name); |
| 1228 | if (uchan == NULL) { |
| 1229 | /* Create default channel */ |
| 1230 | attr = channel_new_default_attr(LTTNG_DOMAIN_UST, |
| 1231 | usess->buffer_type); |
| 1232 | if (attr == NULL) { |
| 1233 | ret = LTTNG_ERR_FATAL; |
| 1234 | goto error; |
| 1235 | } |
| 1236 | strncpy(attr->name, channel_name, sizeof(attr->name)); |
| 1237 | |
| 1238 | ret = cmd_enable_channel(session, domain, attr, wpipe); |
| 1239 | if (ret != LTTNG_OK) { |
| 1240 | free(attr); |
| 1241 | goto error; |
| 1242 | } |
| 1243 | free(attr); |
| 1244 | |
| 1245 | /* Get the newly created channel reference back */ |
| 1246 | uchan = trace_ust_find_channel_by_name( |
| 1247 | usess->domain_global.channels, channel_name); |
| 1248 | assert(uchan); |
| 1249 | } |
| 1250 | |
| 1251 | /* At this point, the session and channel exist on the tracer */ |
| 1252 | ret = event_ust_enable_tracepoint(usess, uchan, event, filter); |
| 1253 | if (ret != LTTNG_OK) { |
| 1254 | goto error; |
| 1255 | } |
| 1256 | break; |
| 1257 | } |
| 1258 | #if 0 |
| 1259 | case LTTNG_DOMAIN_UST_EXEC_NAME: |
| 1260 | case LTTNG_DOMAIN_UST_PID: |
| 1261 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: |
| 1262 | #endif |
| 1263 | default: |
| 1264 | ret = LTTNG_ERR_UND; |
| 1265 | goto error; |
| 1266 | } |
| 1267 | |
| 1268 | ret = LTTNG_OK; |
| 1269 | |
| 1270 | error: |
| 1271 | rcu_read_unlock(); |
| 1272 | return ret; |
| 1273 | } |
| 1274 | |
| 1275 | /* |
| 1276 | * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread. |
| 1277 | */ |
| 1278 | int cmd_enable_event_all(struct ltt_session *session, |
| 1279 | struct lttng_domain *domain, char *channel_name, int event_type, |
| 1280 | struct lttng_filter_bytecode *filter, int wpipe) |
| 1281 | { |
| 1282 | int ret; |
| 1283 | struct lttng_channel *attr; |
| 1284 | |
| 1285 | assert(session); |
| 1286 | assert(channel_name); |
| 1287 | |
| 1288 | rcu_read_lock(); |
| 1289 | |
| 1290 | switch (domain->type) { |
| 1291 | case LTTNG_DOMAIN_KERNEL: |
| 1292 | { |
| 1293 | struct ltt_kernel_channel *kchan; |
| 1294 | |
| 1295 | assert(session->kernel_session); |
| 1296 | |
| 1297 | kchan = trace_kernel_get_channel_by_name(channel_name, |
| 1298 | session->kernel_session); |
| 1299 | if (kchan == NULL) { |
| 1300 | /* Create default channel */ |
| 1301 | attr = channel_new_default_attr(LTTNG_DOMAIN_KERNEL, |
| 1302 | LTTNG_BUFFER_GLOBAL); |
| 1303 | if (attr == NULL) { |
| 1304 | ret = LTTNG_ERR_FATAL; |
| 1305 | goto error; |
| 1306 | } |
| 1307 | strncpy(attr->name, channel_name, sizeof(attr->name)); |
| 1308 | |
| 1309 | ret = cmd_enable_channel(session, domain, attr, wpipe); |
| 1310 | if (ret != LTTNG_OK) { |
| 1311 | free(attr); |
| 1312 | goto error; |
| 1313 | } |
| 1314 | free(attr); |
| 1315 | |
| 1316 | /* Get the newly created kernel channel pointer */ |
| 1317 | kchan = trace_kernel_get_channel_by_name(channel_name, |
| 1318 | session->kernel_session); |
| 1319 | assert(kchan); |
| 1320 | } |
| 1321 | |
| 1322 | switch (event_type) { |
| 1323 | case LTTNG_EVENT_SYSCALL: |
| 1324 | ret = event_kernel_enable_all_syscalls(kchan, kernel_tracer_fd); |
| 1325 | break; |
| 1326 | case LTTNG_EVENT_TRACEPOINT: |
| 1327 | /* |
| 1328 | * This call enables all LTTNG_KERNEL_TRACEPOINTS and |
| 1329 | * events already registered to the channel. |
| 1330 | */ |
| 1331 | ret = event_kernel_enable_all_tracepoints(kchan, kernel_tracer_fd); |
| 1332 | break; |
| 1333 | case LTTNG_EVENT_ALL: |
| 1334 | /* Enable syscalls and tracepoints */ |
| 1335 | ret = event_kernel_enable_all(kchan, kernel_tracer_fd); |
| 1336 | break; |
| 1337 | default: |
| 1338 | ret = LTTNG_ERR_KERN_ENABLE_FAIL; |
| 1339 | goto error; |
| 1340 | } |
| 1341 | |
| 1342 | /* Manage return value */ |
| 1343 | if (ret != LTTNG_OK) { |
| 1344 | /* |
| 1345 | * On error, cmd_enable_channel call will take care of destroying |
| 1346 | * the created channel if it was needed. |
| 1347 | */ |
| 1348 | goto error; |
| 1349 | } |
| 1350 | |
| 1351 | kernel_wait_quiescent(kernel_tracer_fd); |
| 1352 | break; |
| 1353 | } |
| 1354 | case LTTNG_DOMAIN_UST: |
| 1355 | { |
| 1356 | struct ltt_ust_channel *uchan; |
| 1357 | struct ltt_ust_session *usess = session->ust_session; |
| 1358 | |
| 1359 | assert(usess); |
| 1360 | |
| 1361 | /* Get channel from global UST domain */ |
| 1362 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, |
| 1363 | channel_name); |
| 1364 | if (uchan == NULL) { |
| 1365 | /* Create default channel */ |
| 1366 | attr = channel_new_default_attr(LTTNG_DOMAIN_UST, |
| 1367 | usess->buffer_type); |
| 1368 | if (attr == NULL) { |
| 1369 | ret = LTTNG_ERR_FATAL; |
| 1370 | goto error; |
| 1371 | } |
| 1372 | strncpy(attr->name, channel_name, sizeof(attr->name)); |
| 1373 | |
| 1374 | ret = cmd_enable_channel(session, domain, attr, wpipe); |
| 1375 | if (ret != LTTNG_OK) { |
| 1376 | free(attr); |
| 1377 | goto error; |
| 1378 | } |
| 1379 | free(attr); |
| 1380 | |
| 1381 | /* Get the newly created channel reference back */ |
| 1382 | uchan = trace_ust_find_channel_by_name( |
| 1383 | usess->domain_global.channels, channel_name); |
| 1384 | assert(uchan); |
| 1385 | } |
| 1386 | |
| 1387 | /* At this point, the session and channel exist on the tracer */ |
| 1388 | |
| 1389 | switch (event_type) { |
| 1390 | case LTTNG_EVENT_ALL: |
| 1391 | case LTTNG_EVENT_TRACEPOINT: |
| 1392 | ret = event_ust_enable_all_tracepoints(usess, uchan, filter); |
| 1393 | if (ret != LTTNG_OK) { |
| 1394 | goto error; |
| 1395 | } |
| 1396 | break; |
| 1397 | default: |
| 1398 | ret = LTTNG_ERR_UST_ENABLE_FAIL; |
| 1399 | goto error; |
| 1400 | } |
| 1401 | |
| 1402 | /* Manage return value */ |
| 1403 | if (ret != LTTNG_OK) { |
| 1404 | goto error; |
| 1405 | } |
| 1406 | |
| 1407 | break; |
| 1408 | } |
| 1409 | #if 0 |
| 1410 | case LTTNG_DOMAIN_UST_EXEC_NAME: |
| 1411 | case LTTNG_DOMAIN_UST_PID: |
| 1412 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: |
| 1413 | #endif |
| 1414 | default: |
| 1415 | ret = LTTNG_ERR_UND; |
| 1416 | goto error; |
| 1417 | } |
| 1418 | |
| 1419 | ret = LTTNG_OK; |
| 1420 | |
| 1421 | error: |
| 1422 | rcu_read_unlock(); |
| 1423 | return ret; |
| 1424 | } |
| 1425 | |
| 1426 | |
| 1427 | /* |
| 1428 | * Command LTTNG_LIST_TRACEPOINTS processed by the client thread. |
| 1429 | */ |
| 1430 | ssize_t cmd_list_tracepoints(int domain, struct lttng_event **events) |
| 1431 | { |
| 1432 | int ret; |
| 1433 | ssize_t nb_events = 0; |
| 1434 | |
| 1435 | switch (domain) { |
| 1436 | case LTTNG_DOMAIN_KERNEL: |
| 1437 | nb_events = kernel_list_events(kernel_tracer_fd, events); |
| 1438 | if (nb_events < 0) { |
| 1439 | ret = LTTNG_ERR_KERN_LIST_FAIL; |
| 1440 | goto error; |
| 1441 | } |
| 1442 | break; |
| 1443 | case LTTNG_DOMAIN_UST: |
| 1444 | nb_events = ust_app_list_events(events); |
| 1445 | if (nb_events < 0) { |
| 1446 | ret = LTTNG_ERR_UST_LIST_FAIL; |
| 1447 | goto error; |
| 1448 | } |
| 1449 | break; |
| 1450 | default: |
| 1451 | ret = LTTNG_ERR_UND; |
| 1452 | goto error; |
| 1453 | } |
| 1454 | |
| 1455 | return nb_events; |
| 1456 | |
| 1457 | error: |
| 1458 | /* Return negative value to differentiate return code */ |
| 1459 | return -ret; |
| 1460 | } |
| 1461 | |
| 1462 | /* |
| 1463 | * Command LTTNG_LIST_TRACEPOINT_FIELDS processed by the client thread. |
| 1464 | */ |
| 1465 | ssize_t cmd_list_tracepoint_fields(int domain, |
| 1466 | struct lttng_event_field **fields) |
| 1467 | { |
| 1468 | int ret; |
| 1469 | ssize_t nb_fields = 0; |
| 1470 | |
| 1471 | switch (domain) { |
| 1472 | case LTTNG_DOMAIN_UST: |
| 1473 | nb_fields = ust_app_list_event_fields(fields); |
| 1474 | if (nb_fields < 0) { |
| 1475 | ret = LTTNG_ERR_UST_LIST_FAIL; |
| 1476 | goto error; |
| 1477 | } |
| 1478 | break; |
| 1479 | case LTTNG_DOMAIN_KERNEL: |
| 1480 | default: /* fall-through */ |
| 1481 | ret = LTTNG_ERR_UND; |
| 1482 | goto error; |
| 1483 | } |
| 1484 | |
| 1485 | return nb_fields; |
| 1486 | |
| 1487 | error: |
| 1488 | /* Return negative value to differentiate return code */ |
| 1489 | return -ret; |
| 1490 | } |
| 1491 | |
| 1492 | /* |
| 1493 | * Command LTTNG_START_TRACE processed by the client thread. |
| 1494 | */ |
| 1495 | int cmd_start_trace(struct ltt_session *session) |
| 1496 | { |
| 1497 | int ret; |
| 1498 | struct ltt_kernel_session *ksession; |
| 1499 | struct ltt_ust_session *usess; |
| 1500 | |
| 1501 | assert(session); |
| 1502 | |
| 1503 | /* Ease our life a bit ;) */ |
| 1504 | ksession = session->kernel_session; |
| 1505 | usess = session->ust_session; |
| 1506 | |
| 1507 | if (session->enabled) { |
| 1508 | /* Already started. */ |
| 1509 | ret = LTTNG_ERR_TRACE_ALREADY_STARTED; |
| 1510 | goto error; |
| 1511 | } |
| 1512 | |
| 1513 | session->enabled = 1; |
| 1514 | |
| 1515 | /* Kernel tracing */ |
| 1516 | if (ksession != NULL) { |
| 1517 | ret = start_kernel_session(ksession, kernel_tracer_fd); |
| 1518 | if (ret != LTTNG_OK) { |
| 1519 | goto error; |
| 1520 | } |
| 1521 | } |
| 1522 | |
| 1523 | /* Flag session that trace should start automatically */ |
| 1524 | if (usess) { |
| 1525 | usess->start_trace = 1; |
| 1526 | |
| 1527 | ret = ust_app_start_trace_all(usess); |
| 1528 | if (ret < 0) { |
| 1529 | ret = LTTNG_ERR_UST_START_FAIL; |
| 1530 | goto error; |
| 1531 | } |
| 1532 | } |
| 1533 | |
| 1534 | session->started = 1; |
| 1535 | |
| 1536 | ret = LTTNG_OK; |
| 1537 | |
| 1538 | error: |
| 1539 | return ret; |
| 1540 | } |
| 1541 | |
| 1542 | /* |
| 1543 | * Command LTTNG_STOP_TRACE processed by the client thread. |
| 1544 | */ |
| 1545 | int cmd_stop_trace(struct ltt_session *session) |
| 1546 | { |
| 1547 | int ret; |
| 1548 | struct ltt_kernel_channel *kchan; |
| 1549 | struct ltt_kernel_session *ksession; |
| 1550 | struct ltt_ust_session *usess; |
| 1551 | |
| 1552 | assert(session); |
| 1553 | |
| 1554 | /* Short cut */ |
| 1555 | ksession = session->kernel_session; |
| 1556 | usess = session->ust_session; |
| 1557 | |
| 1558 | if (!session->enabled) { |
| 1559 | ret = LTTNG_ERR_TRACE_ALREADY_STOPPED; |
| 1560 | goto error; |
| 1561 | } |
| 1562 | |
| 1563 | session->enabled = 0; |
| 1564 | |
| 1565 | /* Kernel tracer */ |
| 1566 | if (ksession && ksession->started) { |
| 1567 | DBG("Stop kernel tracing"); |
| 1568 | |
| 1569 | /* Flush metadata if exist */ |
| 1570 | if (ksession->metadata_stream_fd >= 0) { |
| 1571 | ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd); |
| 1572 | if (ret < 0) { |
| 1573 | ERR("Kernel metadata flush failed"); |
| 1574 | } |
| 1575 | } |
| 1576 | |
| 1577 | /* Flush all buffers before stopping */ |
| 1578 | cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) { |
| 1579 | ret = kernel_flush_buffer(kchan); |
| 1580 | if (ret < 0) { |
| 1581 | ERR("Kernel flush buffer error"); |
| 1582 | } |
| 1583 | } |
| 1584 | |
| 1585 | ret = kernel_stop_session(ksession); |
| 1586 | if (ret < 0) { |
| 1587 | ret = LTTNG_ERR_KERN_STOP_FAIL; |
| 1588 | goto error; |
| 1589 | } |
| 1590 | |
| 1591 | kernel_wait_quiescent(kernel_tracer_fd); |
| 1592 | |
| 1593 | ksession->started = 0; |
| 1594 | } |
| 1595 | |
| 1596 | if (usess && usess->start_trace) { |
| 1597 | usess->start_trace = 0; |
| 1598 | |
| 1599 | ret = ust_app_stop_trace_all(usess); |
| 1600 | if (ret < 0) { |
| 1601 | ret = LTTNG_ERR_UST_STOP_FAIL; |
| 1602 | goto error; |
| 1603 | } |
| 1604 | } |
| 1605 | |
| 1606 | ret = LTTNG_OK; |
| 1607 | |
| 1608 | error: |
| 1609 | return ret; |
| 1610 | } |
| 1611 | |
| 1612 | /* |
| 1613 | * Command LTTNG_SET_CONSUMER_URI processed by the client thread. |
| 1614 | */ |
| 1615 | int cmd_set_consumer_uri(int domain, struct ltt_session *session, |
| 1616 | size_t nb_uri, struct lttng_uri *uris) |
| 1617 | { |
| 1618 | int ret, i; |
| 1619 | struct ltt_kernel_session *ksess = session->kernel_session; |
| 1620 | struct ltt_ust_session *usess = session->ust_session; |
| 1621 | struct consumer_output *consumer = NULL; |
| 1622 | |
| 1623 | assert(session); |
| 1624 | assert(uris); |
| 1625 | assert(nb_uri > 0); |
| 1626 | |
| 1627 | /* Can't enable consumer after session started. */ |
| 1628 | if (session->enabled) { |
| 1629 | ret = LTTNG_ERR_TRACE_ALREADY_STARTED; |
| 1630 | goto error; |
| 1631 | } |
| 1632 | |
| 1633 | /* |
| 1634 | * This case switch makes sure the domain session has a temporary consumer |
| 1635 | * so the URL can be set. |
| 1636 | */ |
| 1637 | switch (domain) { |
| 1638 | case 0: |
| 1639 | /* Code flow error. A session MUST always have a consumer object */ |
| 1640 | assert(session->consumer); |
| 1641 | /* |
| 1642 | * The URL will be added to the tracing session consumer instead of a |
| 1643 | * specific domain consumer. |
| 1644 | */ |
| 1645 | consumer = session->consumer; |
| 1646 | break; |
| 1647 | case LTTNG_DOMAIN_KERNEL: |
| 1648 | /* Code flow error if we don't have a kernel session here. */ |
| 1649 | assert(ksess); |
| 1650 | assert(ksess->consumer); |
| 1651 | consumer = ksess->consumer; |
| 1652 | break; |
| 1653 | case LTTNG_DOMAIN_UST: |
| 1654 | /* Code flow error if we don't have a kernel session here. */ |
| 1655 | assert(usess); |
| 1656 | assert(usess->consumer); |
| 1657 | consumer = usess->consumer; |
| 1658 | break; |
| 1659 | } |
| 1660 | |
| 1661 | for (i = 0; i < nb_uri; i++) { |
| 1662 | ret = add_uri_to_consumer(consumer, &uris[i], domain, session->name); |
| 1663 | if (ret != LTTNG_OK) { |
| 1664 | goto error; |
| 1665 | } |
| 1666 | } |
| 1667 | |
| 1668 | /* All good! */ |
| 1669 | ret = LTTNG_OK; |
| 1670 | |
| 1671 | error: |
| 1672 | return ret; |
| 1673 | } |
| 1674 | |
| 1675 | /* |
| 1676 | * Command LTTNG_CREATE_SESSION processed by the client thread. |
| 1677 | */ |
| 1678 | int cmd_create_session_uri(char *name, struct lttng_uri *uris, |
| 1679 | size_t nb_uri, lttng_sock_cred *creds) |
| 1680 | { |
| 1681 | int ret; |
| 1682 | struct ltt_session *session; |
| 1683 | |
| 1684 | assert(name); |
| 1685 | |
| 1686 | /* No URIs is not possible. */ |
| 1687 | if (uris == NULL) { |
| 1688 | ret = LTTNG_ERR_SESSION_FAIL; |
| 1689 | goto session_error; |
| 1690 | } |
| 1691 | |
| 1692 | /* |
| 1693 | * Verify if the session already exist |
| 1694 | * |
| 1695 | * XXX: There is no need for the session lock list here since the caller |
| 1696 | * (process_client_msg) is holding it. We might want to change that so a |
| 1697 | * single command does not lock the entire session list. |
| 1698 | */ |
| 1699 | session = session_find_by_name(name); |
| 1700 | if (session != NULL) { |
| 1701 | ret = LTTNG_ERR_EXIST_SESS; |
| 1702 | goto find_error; |
| 1703 | } |
| 1704 | |
| 1705 | /* Create tracing session in the registry */ |
| 1706 | ret = session_create(name, LTTNG_SOCK_GET_UID_CRED(creds), |
| 1707 | LTTNG_SOCK_GET_GID_CRED(creds)); |
| 1708 | if (ret != LTTNG_OK) { |
| 1709 | goto session_error; |
| 1710 | } |
| 1711 | |
| 1712 | /* |
| 1713 | * Get the newly created session pointer back |
| 1714 | * |
| 1715 | * XXX: There is no need for the session lock list here since the caller |
| 1716 | * (process_client_msg) is holding it. We might want to change that so a |
| 1717 | * single command does not lock the entire session list. |
| 1718 | */ |
| 1719 | session = session_find_by_name(name); |
| 1720 | assert(session); |
| 1721 | |
| 1722 | /* Create default consumer output for the session not yet created. */ |
| 1723 | session->consumer = consumer_create_output(CONSUMER_DST_LOCAL); |
| 1724 | if (session->consumer == NULL) { |
| 1725 | ret = LTTNG_ERR_FATAL; |
| 1726 | goto consumer_error; |
| 1727 | } |
| 1728 | |
| 1729 | ret = cmd_set_consumer_uri(0, session, nb_uri, uris); |
| 1730 | if (ret != LTTNG_OK) { |
| 1731 | goto consumer_error; |
| 1732 | } |
| 1733 | |
| 1734 | session->consumer->enabled = 1; |
| 1735 | |
| 1736 | return LTTNG_OK; |
| 1737 | |
| 1738 | consumer_error: |
| 1739 | session_destroy(session); |
| 1740 | session_error: |
| 1741 | find_error: |
| 1742 | return ret; |
| 1743 | } |
| 1744 | |
| 1745 | /* |
| 1746 | * Command LTTNG_DESTROY_SESSION processed by the client thread. |
| 1747 | */ |
| 1748 | int cmd_destroy_session(struct ltt_session *session, int wpipe) |
| 1749 | { |
| 1750 | int ret; |
| 1751 | struct ltt_ust_session *usess; |
| 1752 | struct ltt_kernel_session *ksess; |
| 1753 | |
| 1754 | /* Safety net */ |
| 1755 | assert(session); |
| 1756 | |
| 1757 | usess = session->ust_session; |
| 1758 | ksess = session->kernel_session; |
| 1759 | |
| 1760 | /* Clean kernel session teardown */ |
| 1761 | kernel_destroy_session(ksess); |
| 1762 | |
| 1763 | /* UST session teardown */ |
| 1764 | if (usess) { |
| 1765 | /* Close any relayd session */ |
| 1766 | consumer_output_send_destroy_relayd(usess->consumer); |
| 1767 | |
| 1768 | /* Destroy every UST application related to this session. */ |
| 1769 | ret = ust_app_destroy_trace_all(usess); |
| 1770 | if (ret) { |
| 1771 | ERR("Error in ust_app_destroy_trace_all"); |
| 1772 | } |
| 1773 | |
| 1774 | /* Clean up the rest. */ |
| 1775 | trace_ust_destroy_session(usess); |
| 1776 | } |
| 1777 | |
| 1778 | /* |
| 1779 | * Must notify the kernel thread here to update it's poll set in order to |
| 1780 | * remove the channel(s)' fd just destroyed. |
| 1781 | */ |
| 1782 | ret = notify_thread_pipe(wpipe); |
| 1783 | if (ret < 0) { |
| 1784 | PERROR("write kernel poll pipe"); |
| 1785 | } |
| 1786 | |
| 1787 | ret = session_destroy(session); |
| 1788 | |
| 1789 | return ret; |
| 1790 | } |
| 1791 | |
| 1792 | /* |
| 1793 | * Command LTTNG_CALIBRATE processed by the client thread. |
| 1794 | */ |
| 1795 | int cmd_calibrate(int domain, struct lttng_calibrate *calibrate) |
| 1796 | { |
| 1797 | int ret; |
| 1798 | |
| 1799 | switch (domain) { |
| 1800 | case LTTNG_DOMAIN_KERNEL: |
| 1801 | { |
| 1802 | struct lttng_kernel_calibrate kcalibrate; |
| 1803 | |
| 1804 | kcalibrate.type = calibrate->type; |
| 1805 | ret = kernel_calibrate(kernel_tracer_fd, &kcalibrate); |
| 1806 | if (ret < 0) { |
| 1807 | ret = LTTNG_ERR_KERN_ENABLE_FAIL; |
| 1808 | goto error; |
| 1809 | } |
| 1810 | break; |
| 1811 | } |
| 1812 | case LTTNG_DOMAIN_UST: |
| 1813 | { |
| 1814 | struct lttng_ust_calibrate ucalibrate; |
| 1815 | |
| 1816 | ucalibrate.type = calibrate->type; |
| 1817 | ret = ust_app_calibrate_glb(&ucalibrate); |
| 1818 | if (ret < 0) { |
| 1819 | ret = LTTNG_ERR_UST_CALIBRATE_FAIL; |
| 1820 | goto error; |
| 1821 | } |
| 1822 | break; |
| 1823 | } |
| 1824 | default: |
| 1825 | ret = LTTNG_ERR_UND; |
| 1826 | goto error; |
| 1827 | } |
| 1828 | |
| 1829 | ret = LTTNG_OK; |
| 1830 | |
| 1831 | error: |
| 1832 | return ret; |
| 1833 | } |
| 1834 | |
| 1835 | /* |
| 1836 | * Command LTTNG_REGISTER_CONSUMER processed by the client thread. |
| 1837 | */ |
| 1838 | int cmd_register_consumer(struct ltt_session *session, int domain, |
| 1839 | const char *sock_path, struct consumer_data *cdata) |
| 1840 | { |
| 1841 | int ret, sock; |
| 1842 | struct consumer_socket *socket = NULL; |
| 1843 | |
| 1844 | assert(session); |
| 1845 | assert(cdata); |
| 1846 | assert(sock_path); |
| 1847 | |
| 1848 | switch (domain) { |
| 1849 | case LTTNG_DOMAIN_KERNEL: |
| 1850 | { |
| 1851 | struct ltt_kernel_session *ksess = session->kernel_session; |
| 1852 | |
| 1853 | assert(ksess); |
| 1854 | |
| 1855 | /* Can't register a consumer if there is already one */ |
| 1856 | if (ksess->consumer_fds_sent != 0) { |
| 1857 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; |
| 1858 | goto error; |
| 1859 | } |
| 1860 | |
| 1861 | sock = lttcomm_connect_unix_sock(sock_path); |
| 1862 | if (sock < 0) { |
| 1863 | ret = LTTNG_ERR_CONNECT_FAIL; |
| 1864 | goto error; |
| 1865 | } |
| 1866 | |
| 1867 | socket = consumer_allocate_socket(sock); |
| 1868 | if (socket == NULL) { |
| 1869 | ret = close(sock); |
| 1870 | if (ret < 0) { |
| 1871 | PERROR("close register consumer"); |
| 1872 | } |
| 1873 | ret = LTTNG_ERR_FATAL; |
| 1874 | goto error; |
| 1875 | } |
| 1876 | |
| 1877 | socket->lock = zmalloc(sizeof(pthread_mutex_t)); |
| 1878 | if (socket->lock == NULL) { |
| 1879 | PERROR("zmalloc pthread mutex"); |
| 1880 | ret = LTTNG_ERR_FATAL; |
| 1881 | goto error; |
| 1882 | } |
| 1883 | pthread_mutex_init(socket->lock, NULL); |
| 1884 | socket->registered = 1; |
| 1885 | |
| 1886 | rcu_read_lock(); |
| 1887 | consumer_add_socket(socket, ksess->consumer); |
| 1888 | rcu_read_unlock(); |
| 1889 | |
| 1890 | pthread_mutex_lock(&cdata->pid_mutex); |
| 1891 | cdata->pid = -1; |
| 1892 | pthread_mutex_unlock(&cdata->pid_mutex); |
| 1893 | |
| 1894 | break; |
| 1895 | } |
| 1896 | default: |
| 1897 | /* TODO: Userspace tracing */ |
| 1898 | ret = LTTNG_ERR_UND; |
| 1899 | goto error; |
| 1900 | } |
| 1901 | |
| 1902 | return LTTNG_OK; |
| 1903 | |
| 1904 | error: |
| 1905 | if (socket) { |
| 1906 | consumer_destroy_socket(socket); |
| 1907 | } |
| 1908 | return ret; |
| 1909 | } |
| 1910 | |
| 1911 | /* |
| 1912 | * Command LTTNG_LIST_DOMAINS processed by the client thread. |
| 1913 | */ |
| 1914 | ssize_t cmd_list_domains(struct ltt_session *session, |
| 1915 | struct lttng_domain **domains) |
| 1916 | { |
| 1917 | int ret, index = 0; |
| 1918 | ssize_t nb_dom = 0; |
| 1919 | |
| 1920 | if (session->kernel_session != NULL) { |
| 1921 | DBG3("Listing domains found kernel domain"); |
| 1922 | nb_dom++; |
| 1923 | } |
| 1924 | |
| 1925 | if (session->ust_session != NULL) { |
| 1926 | DBG3("Listing domains found UST global domain"); |
| 1927 | nb_dom++; |
| 1928 | } |
| 1929 | |
| 1930 | *domains = zmalloc(nb_dom * sizeof(struct lttng_domain)); |
| 1931 | if (*domains == NULL) { |
| 1932 | ret = LTTNG_ERR_FATAL; |
| 1933 | goto error; |
| 1934 | } |
| 1935 | |
| 1936 | if (session->kernel_session != NULL) { |
| 1937 | (*domains)[index].type = LTTNG_DOMAIN_KERNEL; |
| 1938 | index++; |
| 1939 | } |
| 1940 | |
| 1941 | if (session->ust_session != NULL) { |
| 1942 | (*domains)[index].type = LTTNG_DOMAIN_UST; |
| 1943 | (*domains)[index].buf_type = session->ust_session->buffer_type; |
| 1944 | index++; |
| 1945 | } |
| 1946 | |
| 1947 | return nb_dom; |
| 1948 | |
| 1949 | error: |
| 1950 | /* Return negative value to differentiate return code */ |
| 1951 | return -ret; |
| 1952 | } |
| 1953 | |
| 1954 | |
| 1955 | /* |
| 1956 | * Command LTTNG_LIST_CHANNELS processed by the client thread. |
| 1957 | */ |
| 1958 | ssize_t cmd_list_channels(int domain, struct ltt_session *session, |
| 1959 | struct lttng_channel **channels) |
| 1960 | { |
| 1961 | int ret; |
| 1962 | ssize_t nb_chan = 0; |
| 1963 | |
| 1964 | switch (domain) { |
| 1965 | case LTTNG_DOMAIN_KERNEL: |
| 1966 | if (session->kernel_session != NULL) { |
| 1967 | nb_chan = session->kernel_session->channel_count; |
| 1968 | } |
| 1969 | DBG3("Number of kernel channels %zd", nb_chan); |
| 1970 | if (nb_chan <= 0) { |
| 1971 | ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND; |
| 1972 | } |
| 1973 | break; |
| 1974 | case LTTNG_DOMAIN_UST: |
| 1975 | if (session->ust_session != NULL) { |
| 1976 | nb_chan = lttng_ht_get_count( |
| 1977 | session->ust_session->domain_global.channels); |
| 1978 | } |
| 1979 | DBG3("Number of UST global channels %zd", nb_chan); |
| 1980 | if (nb_chan <= 0) { |
| 1981 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; |
| 1982 | } |
| 1983 | break; |
| 1984 | default: |
| 1985 | *channels = NULL; |
| 1986 | ret = LTTNG_ERR_UND; |
| 1987 | goto error; |
| 1988 | } |
| 1989 | |
| 1990 | if (nb_chan > 0) { |
| 1991 | *channels = zmalloc(nb_chan * sizeof(struct lttng_channel)); |
| 1992 | if (*channels == NULL) { |
| 1993 | ret = LTTNG_ERR_FATAL; |
| 1994 | goto error; |
| 1995 | } |
| 1996 | |
| 1997 | list_lttng_channels(domain, session, *channels); |
| 1998 | } else { |
| 1999 | *channels = NULL; |
| 2000 | /* Ret value was set in the domain switch case */ |
| 2001 | goto error; |
| 2002 | } |
| 2003 | |
| 2004 | return nb_chan; |
| 2005 | |
| 2006 | error: |
| 2007 | /* Return negative value to differentiate return code */ |
| 2008 | return -ret; |
| 2009 | } |
| 2010 | |
| 2011 | /* |
| 2012 | * Command LTTNG_LIST_EVENTS processed by the client thread. |
| 2013 | */ |
| 2014 | ssize_t cmd_list_events(int domain, struct ltt_session *session, |
| 2015 | char *channel_name, struct lttng_event **events) |
| 2016 | { |
| 2017 | int ret = 0; |
| 2018 | ssize_t nb_event = 0; |
| 2019 | |
| 2020 | switch (domain) { |
| 2021 | case LTTNG_DOMAIN_KERNEL: |
| 2022 | if (session->kernel_session != NULL) { |
| 2023 | nb_event = list_lttng_kernel_events(channel_name, |
| 2024 | session->kernel_session, events); |
| 2025 | } |
| 2026 | break; |
| 2027 | case LTTNG_DOMAIN_UST: |
| 2028 | { |
| 2029 | if (session->ust_session != NULL) { |
| 2030 | nb_event = list_lttng_ust_global_events(channel_name, |
| 2031 | &session->ust_session->domain_global, events); |
| 2032 | } |
| 2033 | break; |
| 2034 | } |
| 2035 | default: |
| 2036 | ret = LTTNG_ERR_UND; |
| 2037 | goto error; |
| 2038 | } |
| 2039 | |
| 2040 | return nb_event; |
| 2041 | |
| 2042 | error: |
| 2043 | /* Return negative value to differentiate return code */ |
| 2044 | return -ret; |
| 2045 | } |
| 2046 | |
| 2047 | /* |
| 2048 | * Using the session list, filled a lttng_session array to send back to the |
| 2049 | * client for session listing. |
| 2050 | * |
| 2051 | * The session list lock MUST be acquired before calling this function. Use |
| 2052 | * session_lock_list() and session_unlock_list(). |
| 2053 | */ |
| 2054 | void cmd_list_lttng_sessions(struct lttng_session *sessions, uid_t uid, |
| 2055 | gid_t gid) |
| 2056 | { |
| 2057 | int ret; |
| 2058 | unsigned int i = 0; |
| 2059 | struct ltt_session *session; |
| 2060 | struct ltt_session_list *list = session_get_list(); |
| 2061 | |
| 2062 | DBG("Getting all available session for UID %d GID %d", |
| 2063 | uid, gid); |
| 2064 | /* |
| 2065 | * Iterate over session list and append data after the control struct in |
| 2066 | * the buffer. |
| 2067 | */ |
| 2068 | cds_list_for_each_entry(session, &list->head, list) { |
| 2069 | /* |
| 2070 | * Only list the sessions the user can control. |
| 2071 | */ |
| 2072 | if (!session_access_ok(session, uid, gid)) { |
| 2073 | continue; |
| 2074 | } |
| 2075 | |
| 2076 | struct ltt_kernel_session *ksess = session->kernel_session; |
| 2077 | struct ltt_ust_session *usess = session->ust_session; |
| 2078 | |
| 2079 | if (session->consumer->type == CONSUMER_DST_NET || |
| 2080 | (ksess && ksess->consumer->type == CONSUMER_DST_NET) || |
| 2081 | (usess && usess->consumer->type == CONSUMER_DST_NET)) { |
| 2082 | ret = build_network_session_path(sessions[i].path, |
| 2083 | sizeof(sessions[i].path), session); |
| 2084 | } else { |
| 2085 | ret = snprintf(sessions[i].path, sizeof(sessions[i].path), "%s", |
| 2086 | session->consumer->dst.trace_path); |
| 2087 | } |
| 2088 | if (ret < 0) { |
| 2089 | PERROR("snprintf session path"); |
| 2090 | continue; |
| 2091 | } |
| 2092 | |
| 2093 | strncpy(sessions[i].name, session->name, NAME_MAX); |
| 2094 | sessions[i].name[NAME_MAX - 1] = '\0'; |
| 2095 | sessions[i].enabled = session->enabled; |
| 2096 | i++; |
| 2097 | } |
| 2098 | } |
| 2099 | |
| 2100 | /* |
| 2101 | * Command LTTNG_DATA_PENDING returning 0 if the data is NOT pending meaning |
| 2102 | * ready for trace analysis (or anykind of reader) or else 1 for pending data. |
| 2103 | */ |
| 2104 | int cmd_data_pending(struct ltt_session *session) |
| 2105 | { |
| 2106 | int ret; |
| 2107 | struct ltt_kernel_session *ksess = session->kernel_session; |
| 2108 | struct ltt_ust_session *usess = session->ust_session; |
| 2109 | |
| 2110 | assert(session); |
| 2111 | |
| 2112 | /* Session MUST be stopped to ask for data availability. */ |
| 2113 | if (session->enabled) { |
| 2114 | ret = LTTNG_ERR_SESSION_STARTED; |
| 2115 | goto error; |
| 2116 | } |
| 2117 | |
| 2118 | if (ksess && ksess->consumer) { |
| 2119 | ret = consumer_is_data_pending(ksess->id, ksess->consumer); |
| 2120 | if (ret == 1) { |
| 2121 | /* Data is still being extracted for the kernel. */ |
| 2122 | goto error; |
| 2123 | } |
| 2124 | } |
| 2125 | |
| 2126 | if (usess && usess->consumer) { |
| 2127 | ret = consumer_is_data_pending(usess->id, usess->consumer); |
| 2128 | if (ret == 1) { |
| 2129 | /* Data is still being extracted for the kernel. */ |
| 2130 | goto error; |
| 2131 | } |
| 2132 | } |
| 2133 | |
| 2134 | /* Data is ready to be read by a viewer */ |
| 2135 | ret = 0; |
| 2136 | |
| 2137 | error: |
| 2138 | return ret; |
| 2139 | } |
| 2140 | |
| 2141 | /* |
| 2142 | * Init command subsystem. |
| 2143 | */ |
| 2144 | void cmd_init(void) |
| 2145 | { |
| 2146 | /* |
| 2147 | * Set network sequence index to 1 for streams to match a relayd |
| 2148 | * socket on the consumer side. |
| 2149 | */ |
| 2150 | pthread_mutex_lock(&relayd_net_seq_idx_lock); |
| 2151 | relayd_net_seq_idx = 1; |
| 2152 | pthread_mutex_unlock(&relayd_net_seq_idx_lock); |
| 2153 | |
| 2154 | DBG("Command subsystem initialized"); |
| 2155 | } |