| 1 | /* |
| 2 | * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca> |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or modify |
| 5 | * it under the terms of the GNU General Public License, version 2 only, |
| 6 | * as published by the Free Software Foundation. |
| 7 | * |
| 8 | * This program is distributed in the hope that it will be useful, |
| 9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 11 | * GNU General Public License for more details. |
| 12 | * |
| 13 | * You should have received a copy of the GNU General Public License along |
| 14 | * with this program; if not, write to the Free Software Foundation, Inc., |
| 15 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. |
| 16 | */ |
| 17 | |
| 18 | #define _LGPL_SOURCE |
| 19 | #include <assert.h> |
| 20 | #include <ctype.h> |
| 21 | #include <popt.h> |
| 22 | #include <stdio.h> |
| 23 | #include <stdlib.h> |
| 24 | #include <string.h> |
| 25 | #include <sys/stat.h> |
| 26 | #include <sys/types.h> |
| 27 | #include <time.h> |
| 28 | #include <unistd.h> |
| 29 | #include <signal.h> |
| 30 | #include <sys/wait.h> |
| 31 | |
| 32 | #include <common/mi-lttng.h> |
| 33 | #include <common/config/session-config.h> |
| 34 | |
| 35 | #include "../command.h" |
| 36 | #include "../utils.h" |
| 37 | |
| 38 | #include <common/defaults.h> |
| 39 | #include <common/sessiond-comm/sessiond-comm.h> |
| 40 | #include <common/uri.h> |
| 41 | #include <common/utils.h> |
| 42 | #include <lttng/snapshot.h> |
| 43 | |
| 44 | static char *opt_output_path; |
| 45 | static char *opt_session_name; |
| 46 | static char *opt_url; |
| 47 | static char *opt_ctrl_url; |
| 48 | static char *opt_data_url; |
| 49 | static char *opt_shm_path; |
| 50 | static char *opt_template_path; |
| 51 | static int opt_no_consumer; |
| 52 | static int opt_no_output; |
| 53 | static int opt_snapshot; |
| 54 | static unsigned int opt_live_timer; |
| 55 | |
| 56 | enum { |
| 57 | OPT_HELP = 1, |
| 58 | OPT_LIST_OPTIONS, |
| 59 | OPT_LIVE_TIMER, |
| 60 | }; |
| 61 | |
| 62 | enum { |
| 63 | OUTPUT_UNKNOWN = -1, |
| 64 | OUTPUT_NONE, |
| 65 | OUTPUT_LOCAL, |
| 66 | OUTPUT_NET, |
| 67 | }; |
| 68 | enum { |
| 69 | SESSION_UNKNOWN = -1, |
| 70 | SESSION_NORMAL, |
| 71 | SESSION_LIVE, |
| 72 | SESSION_SNAPSHOT, |
| 73 | }; |
| 74 | |
| 75 | |
| 76 | static struct mi_writer *writer; |
| 77 | |
| 78 | static struct poptOption long_options[] = { |
| 79 | /* longName, shortName, argInfo, argPtr, value, descrip, argDesc */ |
| 80 | {"help", 'h', POPT_ARG_NONE, NULL, OPT_HELP, NULL, NULL}, |
| 81 | {"output", 'o', POPT_ARG_STRING, &opt_output_path, 0, NULL, NULL}, |
| 82 | {"list-options", 0, POPT_ARG_NONE, NULL, OPT_LIST_OPTIONS, NULL, NULL}, |
| 83 | {"set-url", 'U', POPT_ARG_STRING, &opt_url, 0, 0, 0}, |
| 84 | {"ctrl-url", 'C', POPT_ARG_STRING, &opt_ctrl_url, 0, 0, 0}, |
| 85 | {"data-url", 'D', POPT_ARG_STRING, &opt_data_url, 0, 0, 0}, |
| 86 | {"no-output", 0, POPT_ARG_VAL, &opt_no_output, 1, 0, 0}, |
| 87 | {"no-consumer", 0, POPT_ARG_VAL, &opt_no_consumer, 1, 0, 0}, |
| 88 | {"snapshot", 0, POPT_ARG_VAL, &opt_snapshot, 1, 0, 0}, |
| 89 | {"live", 0, POPT_ARG_INT | POPT_ARGFLAG_OPTIONAL, 0, OPT_LIVE_TIMER, 0, 0}, |
| 90 | {"shm-path", 0, POPT_ARG_STRING, &opt_shm_path, 0, 0, 0}, |
| 91 | {"template-path", 0, POPT_ARG_STRING, &opt_template_path, 0, 0, 0}, |
| 92 | {0, 0, 0, 0, 0, 0, 0} |
| 93 | }; |
| 94 | |
| 95 | /* |
| 96 | * Please have a look at src/lib/lttng-ctl/lttng-ctl.c for more information on |
| 97 | * why this declaration exists and used ONLY in for this command. |
| 98 | */ |
| 99 | extern int _lttng_create_session_ext(const char *name, const char *url, |
| 100 | const char *datetime); |
| 101 | |
| 102 | /* |
| 103 | * Retrieve the created session and mi output it based on provided argument |
| 104 | * This is currently a summary of what was pretty printed and is subject to |
| 105 | * enhancements. |
| 106 | */ |
| 107 | static int mi_created_session(const char *session_name) |
| 108 | { |
| 109 | int ret, i, count, found; |
| 110 | struct lttng_session *sessions; |
| 111 | |
| 112 | /* session_name should not be null */ |
| 113 | assert(session_name); |
| 114 | assert(writer); |
| 115 | |
| 116 | count = lttng_list_sessions(&sessions); |
| 117 | if (count < 0) { |
| 118 | ret = count; |
| 119 | ERR("%s", lttng_strerror(ret)); |
| 120 | goto error; |
| 121 | } |
| 122 | |
| 123 | if (count == 0) { |
| 124 | ERR("Error session creation failed: session %s not found", session_name); |
| 125 | ret = -LTTNG_ERR_SESS_NOT_FOUND; |
| 126 | goto end; |
| 127 | } |
| 128 | |
| 129 | found = 0; |
| 130 | for (i = 0; i < count; i++) { |
| 131 | if (strncmp(sessions[i].name, session_name, NAME_MAX) == 0) { |
| 132 | found = 1; |
| 133 | ret = mi_lttng_session(writer, &sessions[i], 0); |
| 134 | if (ret) { |
| 135 | goto error; |
| 136 | } |
| 137 | break; |
| 138 | } |
| 139 | } |
| 140 | |
| 141 | if (!found) { |
| 142 | ret = -LTTNG_ERR_SESS_NOT_FOUND; |
| 143 | } else { |
| 144 | ret = CMD_SUCCESS; |
| 145 | } |
| 146 | |
| 147 | error: |
| 148 | free(sessions); |
| 149 | end: |
| 150 | return ret; |
| 151 | } |
| 152 | |
| 153 | /* |
| 154 | * For a session name, set the consumer URLs. |
| 155 | */ |
| 156 | static int set_consumer_url(const char *session_name, const char *ctrl_url, |
| 157 | const char *data_url) |
| 158 | { |
| 159 | int ret; |
| 160 | struct lttng_handle *handle; |
| 161 | |
| 162 | assert(session_name); |
| 163 | |
| 164 | /* |
| 165 | * Set handle with the session_name, but no domain. This implies that |
| 166 | * the actions taken with this handle apply on the tracing session |
| 167 | * rather then the domain-specific session. |
| 168 | */ |
| 169 | handle = lttng_create_handle(session_name, NULL); |
| 170 | if (handle == NULL) { |
| 171 | ret = CMD_FATAL; |
| 172 | goto error; |
| 173 | } |
| 174 | |
| 175 | ret = lttng_set_consumer_url(handle, ctrl_url, data_url); |
| 176 | if (ret < 0) { |
| 177 | goto error; |
| 178 | } |
| 179 | |
| 180 | error: |
| 181 | lttng_destroy_handle(handle); |
| 182 | return ret; |
| 183 | } |
| 184 | |
| 185 | static int add_snapshot_output(const char *session_name, const char *ctrl_url, |
| 186 | const char *data_url) |
| 187 | { |
| 188 | int ret; |
| 189 | struct lttng_snapshot_output *output = NULL; |
| 190 | |
| 191 | assert(session_name); |
| 192 | |
| 193 | output = lttng_snapshot_output_create(); |
| 194 | if (!output) { |
| 195 | ret = CMD_FATAL; |
| 196 | goto error_create; |
| 197 | } |
| 198 | |
| 199 | if (ctrl_url) { |
| 200 | ret = lttng_snapshot_output_set_ctrl_url(ctrl_url, output); |
| 201 | if (ret < 0) { |
| 202 | goto error; |
| 203 | } |
| 204 | } |
| 205 | |
| 206 | if (data_url) { |
| 207 | ret = lttng_snapshot_output_set_data_url(data_url, output); |
| 208 | if (ret < 0) { |
| 209 | goto error; |
| 210 | } |
| 211 | } |
| 212 | |
| 213 | /* This call, if successful, populates the id of the output object. */ |
| 214 | ret = lttng_snapshot_add_output(session_name, output); |
| 215 | if (ret < 0) { |
| 216 | goto error; |
| 217 | } |
| 218 | |
| 219 | error: |
| 220 | lttng_snapshot_output_destroy(output); |
| 221 | error_create: |
| 222 | return ret; |
| 223 | } |
| 224 | |
| 225 | /* |
| 226 | * Validate the combinations of passed options |
| 227 | * |
| 228 | * CMD_ERROR on error |
| 229 | * CMD_SUCCESS on success |
| 230 | */ |
| 231 | static int validate_command_options(int session_type) |
| 232 | { |
| 233 | int ret = CMD_SUCCESS; |
| 234 | |
| 235 | if (opt_snapshot && opt_live_timer) { |
| 236 | ERR("Snapshot and live modes are mutually exclusive."); |
| 237 | ret = CMD_ERROR; |
| 238 | goto error; |
| 239 | } |
| 240 | |
| 241 | if ((!opt_ctrl_url && opt_data_url) || (opt_ctrl_url && !opt_data_url)) { |
| 242 | ERR("Control and data URLs must both be set."); |
| 243 | ret = CMD_ERROR; |
| 244 | goto error; |
| 245 | } |
| 246 | |
| 247 | if (opt_template_path) { |
| 248 | /* Restriction on flags exist when using template */ |
| 249 | /* Session type flags are not permitted */ |
| 250 | /* --live & --snapshot */ |
| 251 | if ((opt_live_timer && session_type != SESSION_LIVE) || |
| 252 | (opt_snapshot && session_type != SESSION_SNAPSHOT)) { |
| 253 | ERR("It is not possible to change the session type of a template"); |
| 254 | ret = CMD_ERROR; |
| 255 | goto error; |
| 256 | } |
| 257 | } |
| 258 | |
| 259 | error: |
| 260 | return ret; |
| 261 | } |
| 262 | |
| 263 | /* |
| 264 | * Create a session using direct calls to liblttng-ctl. |
| 265 | * |
| 266 | * Return CMD_SUCCESS on success, negative value on internal lttng errors and positive |
| 267 | * value on command errors. |
| 268 | */ |
| 269 | static int create_session_basic (const char *session_name, |
| 270 | int session_type, |
| 271 | int live_timer, |
| 272 | int output_type, |
| 273 | const char* url, |
| 274 | const char* ctrl_url, |
| 275 | const char* data_url, |
| 276 | const char* shm_path, |
| 277 | const char* datetime) |
| 278 | { |
| 279 | /* Create session based on session creation */ |
| 280 | int ret = CMD_SUCCESS; |
| 281 | const char *pathname; |
| 282 | |
| 283 | assert(datetime); |
| 284 | |
| 285 | if (opt_relayd_path) { |
| 286 | pathname = opt_relayd_path; |
| 287 | } else { |
| 288 | pathname = INSTALL_BIN_PATH "/lttng-relayd"; |
| 289 | } |
| 290 | |
| 291 | switch (session_type) { |
| 292 | case SESSION_NORMAL: |
| 293 | ret = _lttng_create_session_ext(session_name, url, datetime); |
| 294 | break; |
| 295 | case SESSION_SNAPSHOT: |
| 296 | if (output_type == OUTPUT_NONE) { |
| 297 | ERR("--no-output on a snapshot session is invalid"); |
| 298 | ret = CMD_UNSUPPORTED; |
| 299 | goto error; |
| 300 | } |
| 301 | ret = lttng_create_session_snapshot(session_name, url); |
| 302 | break; |
| 303 | case SESSION_LIVE: |
| 304 | if (output_type == OUTPUT_NONE) { |
| 305 | ERR("--no-output on a live session is invalid"); |
| 306 | ret = CMD_UNSUPPORTED; |
| 307 | goto error; |
| 308 | } |
| 309 | |
| 310 | if (output_type == OUTPUT_LOCAL) { |
| 311 | ERR("Local file output on a live session is invalid"); |
| 312 | ret = CMD_UNSUPPORTED; |
| 313 | goto error; |
| 314 | } |
| 315 | if (output_type != OUTPUT_NET && !check_relayd() && |
| 316 | spawn_relayd(pathname, 0) < 0) { |
| 317 | ret = CMD_FATAL; |
| 318 | goto error; |
| 319 | } |
| 320 | ret = lttng_create_session_live(session_name, url, live_timer); |
| 321 | break; |
| 322 | default: |
| 323 | ERR("Unknown session type"); |
| 324 | ret = CMD_UNDEFINED; |
| 325 | goto error; |
| 326 | } |
| 327 | |
| 328 | if (ret < 0) { |
| 329 | /* Don't set ret so the sessiond error is propagated. */ |
| 330 | switch (-ret) { |
| 331 | case LTTNG_ERR_EXIST_SESS: |
| 332 | WARN("Session %s already exists", session_name); |
| 333 | break; |
| 334 | default: |
| 335 | break; |
| 336 | } |
| 337 | goto error; |
| 338 | } |
| 339 | |
| 340 | /* Configure the session based on the output type */ |
| 341 | switch (output_type) { |
| 342 | case OUTPUT_LOCAL: |
| 343 | break; |
| 344 | case OUTPUT_NET: |
| 345 | if (!ctrl_url || !data_url) { |
| 346 | break; |
| 347 | } |
| 348 | |
| 349 | if (session_type == SESSION_SNAPSHOT) { |
| 350 | ret = add_snapshot_output(session_name, ctrl_url, |
| 351 | data_url); |
| 352 | } else { |
| 353 | /* |
| 354 | * Normal sessions and live sessions behave the same way |
| 355 | * regarding consumer url. |
| 356 | */ |
| 357 | ret = set_consumer_url(session_name, ctrl_url, data_url); |
| 358 | } |
| 359 | if (ret < 0) { |
| 360 | /* Destroy created session on errors */ |
| 361 | lttng_destroy_session(session_name); |
| 362 | goto error; |
| 363 | } |
| 364 | break; |
| 365 | case OUTPUT_NONE: |
| 366 | break; |
| 367 | default: |
| 368 | ERR("Unknown output type"); |
| 369 | ret = CMD_UNDEFINED; |
| 370 | goto error; |
| 371 | } |
| 372 | |
| 373 | /* |
| 374 | * Set the session shared memory path |
| 375 | */ |
| 376 | if (shm_path) { |
| 377 | ret = lttng_set_session_shm_path(session_name, shm_path); |
| 378 | if (ret < 0) { |
| 379 | lttng_destroy_session(session_name); |
| 380 | goto error; |
| 381 | } |
| 382 | } |
| 383 | error: |
| 384 | return ret; |
| 385 | } |
| 386 | |
| 387 | static int generate_output(const char *session_name, |
| 388 | int session_type, |
| 389 | int live_timer, |
| 390 | int output_type, |
| 391 | const char* url, |
| 392 | const char* ctrl_url, |
| 393 | const char* data_url, |
| 394 | const char* shm_path) |
| 395 | { |
| 396 | int ret = CMD_SUCCESS; |
| 397 | |
| 398 | /* |
| 399 | * TODO move this to after session name |
| 400 | * for now we only emulate previous behaviour. |
| 401 | */ |
| 402 | if (session_type != SESSION_SNAPSHOT) { |
| 403 | if (ctrl_url) { |
| 404 | MSG("Control URL %s set for session %s", ctrl_url, session_name); |
| 405 | } |
| 406 | |
| 407 | if (data_url) { |
| 408 | MSG("Data URL %s set for session %s", data_url, session_name); |
| 409 | } |
| 410 | } |
| 411 | |
| 412 | if (url && output_type == OUTPUT_LOCAL) { |
| 413 | /* Remove the file:// */ |
| 414 | if (strlen(url) > strlen("file://")){ |
| 415 | url = url + strlen("file://"); |
| 416 | } |
| 417 | } |
| 418 | |
| 419 | MSG("Session %s created.", session_name); |
| 420 | if (url && session_type != SESSION_SNAPSHOT) { |
| 421 | MSG("Traces will be written in %s", url); |
| 422 | |
| 423 | if (live_timer) { |
| 424 | MSG("Live timer set to %u usec", live_timer); |
| 425 | } |
| 426 | } else if (session_type == SESSION_SNAPSHOT) { |
| 427 | if (url) { |
| 428 | MSG("Default snapshot output set to: %s", url); |
| 429 | } |
| 430 | MSG("Snapshot mode set. Every channel enabled for that session will " |
| 431 | "be set to mmap output, and default to overwrite mode."); |
| 432 | } |
| 433 | |
| 434 | if (shm_path) { |
| 435 | MSG("Session %s set to shm_path: %s.", session_name, |
| 436 | shm_path); |
| 437 | } |
| 438 | |
| 439 | /* Mi output */ |
| 440 | if (lttng_opt_mi) { |
| 441 | ret = mi_created_session(session_name); |
| 442 | if (ret) { |
| 443 | ret = CMD_ERROR; |
| 444 | goto error; |
| 445 | } |
| 446 | } |
| 447 | error: |
| 448 | return ret; |
| 449 | } |
| 450 | |
| 451 | static int parse_template (struct config_document *template, |
| 452 | char **session_name, |
| 453 | int *session_type, |
| 454 | int *live_timer, |
| 455 | int *output_type, |
| 456 | char **url, |
| 457 | char **ctrl_url, |
| 458 | char **data_url, |
| 459 | char **shm_path) |
| 460 | { |
| 461 | int ret = 0; |
| 462 | char *raw_value = NULL; |
| 463 | |
| 464 | assert(template); |
| 465 | |
| 466 | /* Session name */ |
| 467 | *session_name = config_document_get_element_value(template,"/sessions/session/name"); |
| 468 | |
| 469 | /* Check the type of session we have in the template */ |
| 470 | if(config_document_element_exist(template, "/sessions/session/attributes/snapshot_mode")) { |
| 471 | *session_type = SESSION_SNAPSHOT; |
| 472 | } else if (config_document_element_exist(template, "/sessions/session/attributes/live_timer_interval")) { |
| 473 | *session_type = SESSION_LIVE; |
| 474 | raw_value = config_document_get_element_value(template,"/sessions/session/attributes/live_timer_interval"); |
| 475 | *live_timer = config_parse_value(raw_value); |
| 476 | free(raw_value); |
| 477 | raw_value = NULL; |
| 478 | } else { |
| 479 | *session_type = SESSION_NORMAL; |
| 480 | } |
| 481 | |
| 482 | /* Output */ |
| 483 | switch (*session_type) { |
| 484 | case SESSION_NORMAL: |
| 485 | case SESSION_LIVE: |
| 486 | if (!config_document_element_exist(template, "/sessions/session/output/consumer_output/destination")){ |
| 487 | break; |
| 488 | } |
| 489 | if (config_document_element_exist(template, "/sessions/session/output/consumer_output/destination/path")){ |
| 490 | raw_value = config_document_get_element_value(template, "/sessions/session/output/consumer_output/destination/path"); |
| 491 | if (!raw_value) { |
| 492 | ret = -1; |
| 493 | goto error; |
| 494 | } |
| 495 | |
| 496 | if (strlen(raw_value) > 0) { |
| 497 | *output_type = OUTPUT_LOCAL; |
| 498 | ret = asprintf(url, "file://%s", raw_value); |
| 499 | if (ret < 0) { |
| 500 | ret = -1; |
| 501 | goto error; |
| 502 | } |
| 503 | } else { |
| 504 | *output_type = OUTPUT_NONE; |
| 505 | } |
| 506 | |
| 507 | free(raw_value); |
| 508 | raw_value = NULL; |
| 509 | break; |
| 510 | } else if(config_document_element_exist(template, "/sessions/session/output/consumer_output/destination/net_output")) { |
| 511 | *ctrl_url = config_document_get_element_value(template, "/sessions/session/output/consumer_output/destination/net_output/control_uri"); |
| 512 | *data_url = config_document_get_element_value(template, "/sessions/session/output/consumer_output/destination/net_output/data_uri"); |
| 513 | if (!*ctrl_url || ! *data_url) { |
| 514 | ret = -1; |
| 515 | goto error; |
| 516 | } |
| 517 | *output_type = OUTPUT_NET; |
| 518 | } else { |
| 519 | /* There is no output definition */ |
| 520 | } |
| 521 | break; |
| 522 | case SESSION_SNAPSHOT: |
| 523 | if (!config_document_element_exist(template, "/sessions/session/output/snapshot_outputs/output/consumer_output/destination")){ |
| 524 | break; |
| 525 | } |
| 526 | if (config_document_element_exist(template, "/sessions/session/output/snapshot_outputs/output/consumer_output/destination/path")){ |
| 527 | raw_value = config_document_get_element_value(template, "/sessions/session/output/snapshot_outputs/output/consumer_output/destination/path"); |
| 528 | if (!raw_value) { |
| 529 | ret = -1; |
| 530 | goto error; |
| 531 | } |
| 532 | |
| 533 | if (strlen(raw_value) > 0) { |
| 534 | *output_type = OUTPUT_LOCAL; |
| 535 | ret = asprintf(url, "file://%s", raw_value); |
| 536 | if (ret < 0) { |
| 537 | ret = -1; |
| 538 | goto error; |
| 539 | } |
| 540 | } else { |
| 541 | *output_type = OUTPUT_NONE; |
| 542 | } |
| 543 | |
| 544 | free(raw_value); |
| 545 | raw_value = NULL; |
| 546 | break; |
| 547 | } else if(config_document_element_exist(template, "/sessions/session/output/snapshot_outputs/output/consumer_output/destination/net_output")) { |
| 548 | *ctrl_url = config_document_get_element_value(template, "/sessions/session/output/snapshot_outputs/output/consumer_output/destination/net_output/control_uri"); |
| 549 | *data_url = config_document_get_element_value(template, "/sessions/session/output/snapshot_outputs/output/consumer_output/destination/net_output/data_uri"); |
| 550 | if (!*ctrl_url || ! *data_url) { |
| 551 | ret = -1; |
| 552 | goto error; |
| 553 | } |
| 554 | *output_type = OUTPUT_NET; |
| 555 | } else { |
| 556 | /* There is no output definition */ |
| 557 | } |
| 558 | break; |
| 559 | } |
| 560 | |
| 561 | |
| 562 | /* shared memory path */ |
| 563 | *shm_path = config_document_get_element_value(template,"/sessions/session/shared_memory_path"); |
| 564 | |
| 565 | error: |
| 566 | free(raw_value); |
| 567 | return ret; |
| 568 | |
| 569 | } |
| 570 | static int create_session_from_template(struct config_document *template, |
| 571 | const char *session_name, |
| 572 | int session_type, |
| 573 | int live_timer, |
| 574 | int output_type, |
| 575 | const char *url, |
| 576 | const char *ctrl_url, |
| 577 | const char *data_url, |
| 578 | const char *shm_path, |
| 579 | const char *datetime) |
| 580 | { |
| 581 | int ret = CMD_SUCCESS; |
| 582 | struct config_element *temp_element = NULL; |
| 583 | struct config_element *temp_element_child = NULL; |
| 584 | char tmp_ctrl_uri[PATH_MAX]; |
| 585 | char tmp_data_uri[PATH_MAX]; |
| 586 | struct lttng_uri *uris = NULL; |
| 587 | ssize_t uri_array_size = 0; |
| 588 | char *tmp_string = NULL; |
| 589 | |
| 590 | assert(template); |
| 591 | assert(session_name); |
| 592 | |
| 593 | memset(tmp_ctrl_uri, 0, sizeof(tmp_ctrl_uri)); |
| 594 | memset(tmp_data_uri, 0, sizeof(tmp_data_uri)); |
| 595 | |
| 596 | /* Session name */ |
| 597 | if (config_document_element_exist(template, "/sessions/session/name")) { |
| 598 | /* Replace the node value */ |
| 599 | config_document_replace_element_value(template, "/sessions/session/name", session_name); |
| 600 | } else { |
| 601 | /* insert the node */ |
| 602 | temp_element = config_element_create("name", session_name); |
| 603 | if (!temp_element) { |
| 604 | ERR("Could not create session name node configuration"); |
| 605 | ret = CMD_ERROR; |
| 606 | goto error; |
| 607 | } |
| 608 | ret = config_document_insert_element(template, "/sessions/session", temp_element); |
| 609 | if (ret) { |
| 610 | ERR("Could not insert session name node configuration"); |
| 611 | ret = CMD_ERROR; |
| 612 | goto error; |
| 613 | } |
| 614 | config_element_free(temp_element); |
| 615 | } |
| 616 | |
| 617 | /* |
| 618 | * Live timer |
| 619 | */ |
| 620 | if (session_type == SESSION_LIVE) { |
| 621 | if (config_document_element_exist(template, "/sessions/session/attributes/live_timer_interval")) { |
| 622 | asprintf(&tmp_string, "%d", live_timer); |
| 623 | config_document_replace_element_value(template, "/sessions/session/attributes/live_timer_interval", tmp_string); |
| 624 | free(tmp_string); |
| 625 | tmp_string = NULL; |
| 626 | } else { |
| 627 | ERR("Invalid live timer template. Missing live timer node"); |
| 628 | ret = CMD_ERROR; |
| 629 | goto error; |
| 630 | } |
| 631 | |
| 632 | } |
| 633 | |
| 634 | /* |
| 635 | * Generate the output node |
| 636 | */ |
| 637 | |
| 638 | /* Get output from urls */ |
| 639 | if (url) { |
| 640 | /* Get lttng uris from single url */ |
| 641 | uri_array_size = uri_parse_str_urls(url, NULL, &uris); |
| 642 | if (uri_array_size < 0) { |
| 643 | ret = CMD_ERROR; |
| 644 | goto error; |
| 645 | } |
| 646 | } else if (ctrl_url && data_url) { |
| 647 | uri_array_size = uri_parse_str_urls(ctrl_url, data_url, &uris); |
| 648 | if (uri_array_size < 0) { |
| 649 | ret = CMD_ERROR; |
| 650 | goto error; |
| 651 | } |
| 652 | } else { |
| 653 | /* --no-output */ |
| 654 | uri_array_size = 0; |
| 655 | } |
| 656 | |
| 657 | /* Validate if the session output type still match the passed data */ |
| 658 | if ( (uri_array_size == 0 && output_type != OUTPUT_NONE) || |
| 659 | (uri_array_size == 1 && output_type != OUTPUT_LOCAL) || |
| 660 | (uri_array_size == 2 && output_type != OUTPUT_NET)) { |
| 661 | ERR("Overwriting value for output do not match the base output type"); |
| 662 | ret = CMD_ERROR; |
| 663 | goto error; |
| 664 | } |
| 665 | |
| 666 | switch (output_type) { |
| 667 | case OUTPUT_NONE: |
| 668 | temp_element_child = config_element_create("path", ""); |
| 669 | if (!temp_element_child) { |
| 670 | ERR("Could not create empty path node configuration"); |
| 671 | ret = CMD_ERROR; |
| 672 | goto error; |
| 673 | } |
| 674 | break; |
| 675 | case OUTPUT_LOCAL: |
| 676 | temp_element_child = config_element_create("path", uris[0].dst.path); |
| 677 | if (!temp_element_child) { |
| 678 | ERR("Could not create local path node configuration"); |
| 679 | ret = CMD_ERROR; |
| 680 | goto error; |
| 681 | } |
| 682 | break; |
| 683 | case OUTPUT_NET: |
| 684 | uri_to_str_url(&uris[0], tmp_ctrl_uri, sizeof(tmp_ctrl_uri)); |
| 685 | uri_to_str_url(&uris[1], tmp_data_uri, sizeof(tmp_data_uri)); |
| 686 | |
| 687 | temp_element_child = config_element_create("net_output", NULL); |
| 688 | if (!temp_element_child) { |
| 689 | ERR("Could not create net_output node configuration"); |
| 690 | ret = CMD_ERROR; |
| 691 | goto error; |
| 692 | } |
| 693 | |
| 694 | temp_element = config_element_create("control_uri", tmp_ctrl_uri); |
| 695 | if (!temp_element_child) { |
| 696 | ERR("Could not create ctrl uri node configuration"); |
| 697 | ret = CMD_ERROR; |
| 698 | goto error; |
| 699 | } |
| 700 | |
| 701 | ret = config_element_add_child(temp_element_child, temp_element); |
| 702 | if (ret) { |
| 703 | ERR("Could not append control uri to the net_output node configuration"); |
| 704 | ret = CMD_ERROR; |
| 705 | goto error; |
| 706 | } |
| 707 | config_element_free(temp_element); |
| 708 | |
| 709 | temp_element = config_element_create("data_uri", tmp_data_uri); |
| 710 | |
| 711 | if (!temp_element_child) { |
| 712 | ERR("Could not create data_uri configuration"); |
| 713 | ret = CMD_ERROR; |
| 714 | goto error; |
| 715 | } |
| 716 | |
| 717 | ret = config_element_add_child(temp_element_child, temp_element); |
| 718 | if (ret) { |
| 719 | ERR("Could not append data uri to the net_output node configuration"); |
| 720 | ret = CMD_ERROR; |
| 721 | goto error; |
| 722 | } |
| 723 | config_element_free(temp_element); |
| 724 | break; |
| 725 | default: |
| 726 | ret = CMD_ERROR; |
| 727 | goto error; |
| 728 | } |
| 729 | |
| 730 | temp_element = config_element_create("destination", NULL); |
| 731 | if (!temp_element) { |
| 732 | ERR("Could not create destination node configuration"); |
| 733 | ret = CMD_ERROR; |
| 734 | goto error; |
| 735 | } |
| 736 | |
| 737 | ret = config_element_add_child(temp_element, temp_element_child); |
| 738 | if (ret) { |
| 739 | ERR("Could not append output data to the destination node configuration"); |
| 740 | ret = CMD_ERROR; |
| 741 | goto error; |
| 742 | } |
| 743 | |
| 744 | /* |
| 745 | * validate and replace the destination node for each session type |
| 746 | * TODO: export string as const and simply assign a base path for the |
| 747 | * destination node based on the session type |
| 748 | **/ |
| 749 | switch (session_type) { |
| 750 | case SESSION_NORMAL: |
| 751 | case SESSION_LIVE: |
| 752 | if (!config_document_element_exist(template, "/sessions/session/output/consumer_output/destination")) { |
| 753 | ERR("Invalid template no destination node configuration present"); |
| 754 | ret = CMD_ERROR; |
| 755 | goto error; |
| 756 | } |
| 757 | |
| 758 | ret = config_document_replace_element(template, "/sessions/session/output/consumer_output/destination", temp_element); |
| 759 | break; |
| 760 | case SESSION_SNAPSHOT: |
| 761 | if (!config_document_element_exist(template, "/sessions/session/output/snapshot_outputs/output/consumer_output/destination")) { |
| 762 | ERR("Invalid template no destination node configuration present"); |
| 763 | ret = CMD_ERROR; |
| 764 | goto error; |
| 765 | } |
| 766 | |
| 767 | ret = config_document_replace_element(template, "/sessions/session/output/snapshot_outputs/output/consumer_output/destination", temp_element); |
| 768 | break; |
| 769 | default: |
| 770 | ERR("Invalid session type"); |
| 771 | ret = CMD_UNDEFINED; |
| 772 | goto error; |
| 773 | } |
| 774 | |
| 775 | |
| 776 | |
| 777 | /* Shm path */ |
| 778 | if (shm_path && config_document_element_exist(template, "/sessions/session/shared_memory_path")) { |
| 779 | /* Replace the node value */ |
| 780 | config_document_replace_element_value(template, "/sessions/session/shared_memory_path", shm_path); |
| 781 | } else if (shm_path) { |
| 782 | /* insert the node */ |
| 783 | temp_element = config_element_create("shared_memory_path", shm_path); |
| 784 | if (!temp_element) { |
| 785 | ERR("Could not create shared_memory_path node configuration"); |
| 786 | ret = CMD_ERROR; |
| 787 | goto error; |
| 788 | } |
| 789 | ret = config_document_insert_element(template, "/sessions/session", temp_element); |
| 790 | if (ret) { |
| 791 | ERR("Could not insert shared_memory_path node configuration"); |
| 792 | ret = CMD_ERROR; |
| 793 | goto error; |
| 794 | } |
| 795 | } |
| 796 | |
| 797 | ret = config_load_configuration_sessions(template, session_name, 0); |
| 798 | |
| 799 | |
| 800 | error: |
| 801 | config_element_free(temp_element); |
| 802 | config_element_free(temp_element_child); |
| 803 | free(tmp_string); |
| 804 | free(uris); |
| 805 | return ret; |
| 806 | |
| 807 | } |
| 808 | |
| 809 | /* |
| 810 | * Create a tracing session. |
| 811 | * If no name is specified, a default name is generated. |
| 812 | * |
| 813 | * Returns one of the CMD_* result constants. |
| 814 | */ |
| 815 | static int create_session(void) |
| 816 | { |
| 817 | int ret; |
| 818 | |
| 819 | |
| 820 | /* Template */ |
| 821 | struct config_document *template = NULL; |
| 822 | |
| 823 | /* Base data */ |
| 824 | int base_session_type = SESSION_UNKNOWN; |
| 825 | int base_output_type = OUTPUT_UNKNOWN; |
| 826 | char *base_session_name = NULL; |
| 827 | char *base_url = NULL; |
| 828 | char *base_ctrl_url = NULL; |
| 829 | char *base_data_url = NULL; |
| 830 | char *base_shm_path = NULL; |
| 831 | int base_live_timer = 0; |
| 832 | |
| 833 | /* Time data */ |
| 834 | char datetime[16]; |
| 835 | time_t rawtime; |
| 836 | struct tm *timeinfo = NULL; |
| 837 | |
| 838 | /* Temporary variables */ |
| 839 | char *traces_path = NULL; |
| 840 | char *temp_url = NULL; |
| 841 | char *session_name_date = NULL; |
| 842 | char *tmp_url = NULL; |
| 843 | char *tmp_home_path = NULL; |
| 844 | struct lttng_uri *uris = NULL; |
| 845 | ssize_t uri_array_size = 0; |
| 846 | |
| 847 | |
| 848 | /* Get date and time for automatic session name/path */ |
| 849 | time(&rawtime); |
| 850 | timeinfo = localtime(&rawtime); |
| 851 | strftime(datetime, sizeof(datetime), "%Y%m%d-%H%M%S", timeinfo); |
| 852 | |
| 853 | if (opt_template_path) { |
| 854 | /* Restriction on flags exist when using template */ |
| 855 | /* Session type flags are not permitted */ |
| 856 | /* --live & --snapshot */ |
| 857 | template = config_document_get(opt_template_path); |
| 858 | if (!template) { |
| 859 | ERR("Template could not be parsed"); |
| 860 | ret = CMD_ERROR; |
| 861 | goto error; |
| 862 | } |
| 863 | /* Load info from template if any */ |
| 864 | /* TODO: might want to use a struct in the end for the session... */ |
| 865 | ret = parse_template(template, &base_session_name, |
| 866 | &base_session_type, |
| 867 | &base_live_timer, |
| 868 | &base_output_type, |
| 869 | &base_url, |
| 870 | &base_ctrl_url, |
| 871 | &base_data_url, |
| 872 | &base_shm_path); |
| 873 | } |
| 874 | |
| 875 | /* Option validation */ |
| 876 | if (validate_command_options(base_session_type) != CMD_SUCCESS) { |
| 877 | ret = CMD_ERROR; |
| 878 | goto error; |
| 879 | } |
| 880 | |
| 881 | /* Find the session type based on options */ |
| 882 | if(base_session_type == SESSION_UNKNOWN) { |
| 883 | if (opt_snapshot) { |
| 884 | base_session_type = SESSION_SNAPSHOT; |
| 885 | } else if (opt_live_timer) { |
| 886 | base_session_type = SESSION_LIVE; |
| 887 | } else { |
| 888 | base_session_type = SESSION_NORMAL; |
| 889 | } |
| 890 | } |
| 891 | |
| 892 | /* |
| 893 | * Session name handling |
| 894 | */ |
| 895 | if (opt_session_name) { |
| 896 | /* Override the session name */ |
| 897 | if (strlen(opt_session_name) > NAME_MAX) { |
| 898 | ERR("Session name too long. Length must be lower or equal to %d", |
| 899 | NAME_MAX); |
| 900 | ret = LTTNG_ERR_SESSION_FAIL; |
| 901 | free(session_name_date); |
| 902 | goto error; |
| 903 | } |
| 904 | /* |
| 905 | * Check if the session name begins with "auto-" or is exactly "auto". |
| 906 | * Both are reserved for the default session name. See bug #449 to |
| 907 | * understand why we need to check both here. |
| 908 | */ |
| 909 | if ((strncmp(opt_session_name, DEFAULT_SESSION_NAME "-", |
| 910 | strlen(DEFAULT_SESSION_NAME) + 1) == 0) || |
| 911 | (strncmp(opt_session_name, DEFAULT_SESSION_NAME, |
| 912 | strlen(DEFAULT_SESSION_NAME)) == 0 && |
| 913 | strlen(opt_session_name) == strlen(DEFAULT_SESSION_NAME))) { |
| 914 | ERR("%s is a reserved keyword for default session(s)", |
| 915 | DEFAULT_SESSION_NAME); |
| 916 | |
| 917 | ret = CMD_ERROR; |
| 918 | goto error; |
| 919 | } |
| 920 | |
| 921 | base_session_name = strndup(opt_session_name, NAME_MAX); |
| 922 | if (!base_session_name) { |
| 923 | PERROR("Strdup session name"); |
| 924 | ret = CMD_ERROR; |
| 925 | goto error; |
| 926 | } |
| 927 | |
| 928 | ret = asprintf(&session_name_date, "%s-%s", base_session_name, datetime); |
| 929 | if (ret < 0) { |
| 930 | PERROR("Asprintf session name"); |
| 931 | goto error; |
| 932 | } |
| 933 | DBG("Session name from command option set to %s", base_session_name); |
| 934 | } else if (base_session_name) { |
| 935 | ret = asprintf(&session_name_date, "%s-%s", base_session_name, datetime); |
| 936 | if (ret < 0) { |
| 937 | PERROR("Asprintf session name"); |
| 938 | goto error; |
| 939 | } |
| 940 | } else { |
| 941 | /* Generate a name */ |
| 942 | ret = asprintf(&base_session_name, DEFAULT_SESSION_NAME "-%s", datetime); |
| 943 | if (ret < 0) { |
| 944 | PERROR("Asprintf session name"); |
| 945 | goto error; |
| 946 | } |
| 947 | session_name_date = strdup(base_session_name); |
| 948 | DBG("Auto session name set to %s", base_session_name); |
| 949 | } |
| 950 | |
| 951 | |
| 952 | /* |
| 953 | * Output handling |
| 954 | */ |
| 955 | |
| 956 | /* |
| 957 | * If any of those options are present clear all output related data. |
| 958 | */ |
| 959 | if (opt_output_path || opt_url || (opt_ctrl_url && opt_data_url) || opt_no_output) { |
| 960 | /* Overwrite output */ |
| 961 | free(base_url); |
| 962 | free(base_ctrl_url); |
| 963 | free(base_data_url); |
| 964 | base_url = NULL; |
| 965 | base_ctrl_url = NULL; |
| 966 | base_data_url = NULL; |
| 967 | } |
| 968 | |
| 969 | if (opt_output_path) { |
| 970 | |
| 971 | traces_path = utils_expand_path(opt_output_path); |
| 972 | if (!traces_path) { |
| 973 | ret = CMD_ERROR; |
| 974 | goto error; |
| 975 | } |
| 976 | |
| 977 | /* Create URL string from the local file system path */ |
| 978 | ret = asprintf(&temp_url, "file://%s", traces_path); |
| 979 | if (ret < 0) { |
| 980 | PERROR("asprintf url path"); |
| 981 | ret = CMD_FATAL; |
| 982 | goto error; |
| 983 | } |
| 984 | |
| 985 | base_url = temp_url; |
| 986 | } else if (opt_url) { /* Handling URL (-U opt) */ |
| 987 | base_url = strdup(opt_url); |
| 988 | } else if (opt_data_url && opt_ctrl_url) { |
| 989 | /* |
| 990 | * With both control and data, we'll be setting the consumer URL |
| 991 | * after session creation thus use no URL. |
| 992 | */ |
| 993 | base_ctrl_url = strdup(opt_ctrl_url); |
| 994 | base_data_url = strdup(opt_data_url); |
| 995 | } else if (!(opt_no_output || base_output_type == OUTPUT_NONE || |
| 996 | base_url || base_ctrl_url || base_data_url)) { |
| 997 | /* Generate default output depending on the session type */ |
| 998 | switch (base_session_type) { |
| 999 | case SESSION_NORMAL: |
| 1000 | /* fallthrough */ |
| 1001 | case SESSION_SNAPSHOT: |
| 1002 | /* Default to a local path */ |
| 1003 | tmp_home_path = utils_get_home_dir(); |
| 1004 | if (tmp_home_path == NULL) { |
| 1005 | ERR("HOME path not found.\n \ |
| 1006 | Please specify an output path using -o, --output PATH"); |
| 1007 | ret = CMD_FATAL; |
| 1008 | goto error; |
| 1009 | } |
| 1010 | |
| 1011 | ret = asprintf(&tmp_url, |
| 1012 | "file://%s/" DEFAULT_TRACE_DIR_NAME "/%s", |
| 1013 | tmp_home_path, session_name_date); |
| 1014 | |
| 1015 | if (ret < 0) { |
| 1016 | PERROR("asprintf trace dir name"); |
| 1017 | ret = CMD_FATAL; |
| 1018 | goto error; |
| 1019 | } |
| 1020 | |
| 1021 | base_url = tmp_url ; |
| 1022 | break; |
| 1023 | case SESSION_LIVE: |
| 1024 | /* Default to a net output */ |
| 1025 | ret = asprintf(&tmp_url, "net://127.0.0.1"); |
| 1026 | if (ret < 0) { |
| 1027 | PERROR("asprintf default live URL"); |
| 1028 | ret = CMD_FATAL; |
| 1029 | goto error; |
| 1030 | } |
| 1031 | base_url = tmp_url ; |
| 1032 | break; |
| 1033 | default: |
| 1034 | ERR("Unknown session type"); |
| 1035 | ret = CMD_FATAL; |
| 1036 | goto error; |
| 1037 | } |
| 1038 | } |
| 1039 | |
| 1040 | /* |
| 1041 | * Shared memory path handling |
| 1042 | */ |
| 1043 | if (opt_shm_path) { |
| 1044 | ret = asprintf(&base_shm_path, "%s/%s", opt_shm_path, session_name_date); |
| 1045 | if (ret < 0) { |
| 1046 | PERROR("asprintf shm_path"); |
| 1047 | goto error; |
| 1048 | } |
| 1049 | } |
| 1050 | |
| 1051 | /* |
| 1052 | * Live timer handling |
| 1053 | */ |
| 1054 | if (opt_live_timer) { |
| 1055 | base_live_timer = opt_live_timer; |
| 1056 | } |
| 1057 | |
| 1058 | /* Get output type from urls */ |
| 1059 | if (base_url) { |
| 1060 | /* Get lttng uris from single url */ |
| 1061 | uri_array_size = uri_parse_str_urls(base_url, NULL, &uris); |
| 1062 | if (uri_array_size < 0) { |
| 1063 | ret = CMD_ERROR; |
| 1064 | goto error; |
| 1065 | } |
| 1066 | } else if (base_ctrl_url && base_data_url) { |
| 1067 | uri_array_size = uri_parse_str_urls(base_ctrl_url, base_data_url, &uris); |
| 1068 | if (uri_array_size < 0) { |
| 1069 | ret = CMD_ERROR; |
| 1070 | goto error; |
| 1071 | } |
| 1072 | } else { |
| 1073 | /* --no-output */ |
| 1074 | uri_array_size = 0; |
| 1075 | } |
| 1076 | |
| 1077 | switch (uri_array_size) { |
| 1078 | case 0: |
| 1079 | base_output_type = OUTPUT_NONE; |
| 1080 | break; |
| 1081 | case 1: |
| 1082 | base_output_type = OUTPUT_LOCAL; |
| 1083 | break; |
| 1084 | case 2: |
| 1085 | base_output_type = OUTPUT_NET; |
| 1086 | break; |
| 1087 | default: |
| 1088 | ret = CMD_ERROR; |
| 1089 | goto error; |
| 1090 | } |
| 1091 | |
| 1092 | if (template) { |
| 1093 | ret = create_session_from_template(template, |
| 1094 | base_session_name, |
| 1095 | base_session_type, |
| 1096 | base_live_timer, |
| 1097 | base_output_type, |
| 1098 | base_url, |
| 1099 | base_ctrl_url, |
| 1100 | base_data_url, |
| 1101 | base_shm_path, |
| 1102 | datetime); |
| 1103 | } else { |
| 1104 | ret = create_session_basic (base_session_name, |
| 1105 | base_session_type, |
| 1106 | base_live_timer, |
| 1107 | base_output_type, |
| 1108 | base_url, |
| 1109 | base_ctrl_url, |
| 1110 | base_data_url, |
| 1111 | base_shm_path, |
| 1112 | datetime); |
| 1113 | } |
| 1114 | if (ret) { |
| 1115 | goto error; |
| 1116 | } |
| 1117 | |
| 1118 | ret = generate_output (base_session_name, |
| 1119 | base_session_type, |
| 1120 | base_live_timer, |
| 1121 | base_output_type, |
| 1122 | base_url, |
| 1123 | base_ctrl_url, |
| 1124 | base_data_url, |
| 1125 | base_shm_path); |
| 1126 | if (ret) { |
| 1127 | goto error; |
| 1128 | } |
| 1129 | |
| 1130 | /* Init lttng session config */ |
| 1131 | ret = config_init(base_session_name); |
| 1132 | if (ret < 0) { |
| 1133 | ret = CMD_ERROR; |
| 1134 | goto error; |
| 1135 | } |
| 1136 | |
| 1137 | ret = CMD_SUCCESS; |
| 1138 | |
| 1139 | error: |
| 1140 | /* Session temp stuff */ |
| 1141 | free(session_name_date); |
| 1142 | free(uris); |
| 1143 | |
| 1144 | if (ret < 0) { |
| 1145 | ERR("%s", lttng_strerror(ret)); |
| 1146 | } |
| 1147 | |
| 1148 | free(base_session_name); |
| 1149 | free(base_url); |
| 1150 | free(base_ctrl_url); |
| 1151 | free(base_data_url); |
| 1152 | free(base_shm_path); |
| 1153 | return ret; |
| 1154 | } |
| 1155 | |
| 1156 | /* |
| 1157 | * spawn_sessiond |
| 1158 | * |
| 1159 | * Spawn a session daemon by forking and execv. |
| 1160 | */ |
| 1161 | static int spawn_sessiond(char *pathname) |
| 1162 | { |
| 1163 | int ret = 0; |
| 1164 | pid_t pid; |
| 1165 | |
| 1166 | MSG("Spawning a session daemon"); |
| 1167 | pid = fork(); |
| 1168 | if (pid == 0) { |
| 1169 | /* |
| 1170 | * Spawn session daemon in daemon mode. |
| 1171 | */ |
| 1172 | execlp(pathname, "lttng-sessiond", |
| 1173 | "--daemonize", NULL); |
| 1174 | /* execlp only returns if error happened */ |
| 1175 | if (errno == ENOENT) { |
| 1176 | ERR("No session daemon found. Use --sessiond-path."); |
| 1177 | } else { |
| 1178 | PERROR("execlp"); |
| 1179 | } |
| 1180 | kill(getppid(), SIGTERM); /* wake parent */ |
| 1181 | exit(EXIT_FAILURE); |
| 1182 | } else if (pid > 0) { |
| 1183 | /* |
| 1184 | * In daemon mode (--daemonize), sessiond only exits when |
| 1185 | * it's ready to accept commands. |
| 1186 | */ |
| 1187 | for (;;) { |
| 1188 | int status; |
| 1189 | pid_t wait_pid_ret = waitpid(pid, &status, 0); |
| 1190 | |
| 1191 | if (wait_pid_ret < 0) { |
| 1192 | if (errno == EINTR) { |
| 1193 | continue; |
| 1194 | } |
| 1195 | PERROR("waitpid"); |
| 1196 | ret = -errno; |
| 1197 | goto end; |
| 1198 | } |
| 1199 | |
| 1200 | if (WIFSIGNALED(status)) { |
| 1201 | ERR("Session daemon was killed by signal %d", |
| 1202 | WTERMSIG(status)); |
| 1203 | ret = -1; |
| 1204 | goto end; |
| 1205 | } else if (WIFEXITED(status)) { |
| 1206 | DBG("Session daemon terminated normally (exit status: %d)", |
| 1207 | WEXITSTATUS(status)); |
| 1208 | |
| 1209 | if (WEXITSTATUS(status) != 0) { |
| 1210 | ERR("Session daemon terminated with an error (exit status: %d)", |
| 1211 | WEXITSTATUS(status)); |
| 1212 | ret = -1; |
| 1213 | goto end; |
| 1214 | } |
| 1215 | break; |
| 1216 | } |
| 1217 | } |
| 1218 | |
| 1219 | goto end; |
| 1220 | } else { |
| 1221 | PERROR("fork"); |
| 1222 | ret = -1; |
| 1223 | goto end; |
| 1224 | } |
| 1225 | |
| 1226 | end: |
| 1227 | return ret; |
| 1228 | } |
| 1229 | |
| 1230 | /* |
| 1231 | * launch_sessiond |
| 1232 | * |
| 1233 | * Check if the session daemon is available using |
| 1234 | * the liblttngctl API for the check. If not, try to |
| 1235 | * spawn a daemon. |
| 1236 | */ |
| 1237 | static int launch_sessiond(void) |
| 1238 | { |
| 1239 | int ret; |
| 1240 | char *pathname = NULL; |
| 1241 | |
| 1242 | ret = lttng_session_daemon_alive(); |
| 1243 | if (ret) { |
| 1244 | /* Sessiond is alive, not an error */ |
| 1245 | ret = 0; |
| 1246 | goto end; |
| 1247 | } |
| 1248 | |
| 1249 | /* Try command line option path */ |
| 1250 | pathname = opt_sessiond_path; |
| 1251 | |
| 1252 | /* Try LTTNG_SESSIOND_PATH env variable */ |
| 1253 | if (pathname == NULL) { |
| 1254 | pathname = getenv(DEFAULT_SESSIOND_PATH_ENV); |
| 1255 | } |
| 1256 | |
| 1257 | /* Try with configured path */ |
| 1258 | if (pathname == NULL) { |
| 1259 | if (CONFIG_SESSIOND_BIN[0] != '\0') { |
| 1260 | pathname = CONFIG_SESSIOND_BIN; |
| 1261 | } |
| 1262 | } |
| 1263 | |
| 1264 | /* Try the default path */ |
| 1265 | if (pathname == NULL) { |
| 1266 | pathname = INSTALL_BIN_PATH "/lttng-sessiond"; |
| 1267 | } |
| 1268 | |
| 1269 | DBG("Session daemon binary path: %s", pathname); |
| 1270 | |
| 1271 | /* Check existence and permissions */ |
| 1272 | ret = access(pathname, F_OK | X_OK); |
| 1273 | if (ret < 0) { |
| 1274 | ERR("No such file or access denied: %s", pathname); |
| 1275 | goto end; |
| 1276 | } |
| 1277 | |
| 1278 | ret = spawn_sessiond(pathname); |
| 1279 | end: |
| 1280 | if (ret) { |
| 1281 | ERR("Problem occurred while launching session daemon (%s)", |
| 1282 | pathname); |
| 1283 | } |
| 1284 | return ret; |
| 1285 | } |
| 1286 | |
| 1287 | /* |
| 1288 | * The 'create <options>' first level command |
| 1289 | * |
| 1290 | * Returns one of the CMD_* result constants. |
| 1291 | */ |
| 1292 | int cmd_create(int argc, const char **argv) |
| 1293 | { |
| 1294 | int opt, ret = CMD_SUCCESS, command_ret = CMD_SUCCESS, success = 1; |
| 1295 | char *opt_arg = NULL; |
| 1296 | static poptContext pc; |
| 1297 | |
| 1298 | pc = poptGetContext(NULL, argc, argv, long_options, 0); |
| 1299 | poptReadDefaultConfig(pc, 0); |
| 1300 | |
| 1301 | while ((opt = poptGetNextOpt(pc)) != -1) { |
| 1302 | switch (opt) { |
| 1303 | case OPT_HELP: |
| 1304 | SHOW_HELP(); |
| 1305 | goto end; |
| 1306 | case OPT_LIST_OPTIONS: |
| 1307 | list_cmd_options(stdout, long_options); |
| 1308 | goto end; |
| 1309 | case OPT_LIVE_TIMER: |
| 1310 | { |
| 1311 | unsigned long v; |
| 1312 | |
| 1313 | errno = 0; |
| 1314 | opt_arg = poptGetOptArg(pc); |
| 1315 | if (!opt_arg) { |
| 1316 | /* Set up default values. */ |
| 1317 | opt_live_timer = (uint32_t) DEFAULT_LTTNG_LIVE_TIMER; |
| 1318 | DBG("Session live timer interval set to default value %d", |
| 1319 | opt_live_timer); |
| 1320 | break; |
| 1321 | } |
| 1322 | |
| 1323 | v = strtoul(opt_arg, NULL, 0); |
| 1324 | if (errno != 0 || !isdigit(opt_arg[0])) { |
| 1325 | ERR("Wrong value in --live parameter: %s", opt_arg); |
| 1326 | ret = CMD_ERROR; |
| 1327 | goto end; |
| 1328 | } |
| 1329 | if (v != (uint32_t) v) { |
| 1330 | ERR("32-bit overflow in --live parameter: %s", opt_arg); |
| 1331 | ret = CMD_ERROR; |
| 1332 | goto end; |
| 1333 | } |
| 1334 | if (v == 0) { |
| 1335 | ERR("Live timer interval must be greater than zero"); |
| 1336 | ret = CMD_ERROR; |
| 1337 | goto end; |
| 1338 | } |
| 1339 | opt_live_timer = (uint32_t) v; |
| 1340 | DBG("Session live timer interval set to %d", opt_live_timer); |
| 1341 | break; |
| 1342 | } |
| 1343 | default: |
| 1344 | ret = CMD_UNDEFINED; |
| 1345 | goto end; |
| 1346 | } |
| 1347 | } |
| 1348 | |
| 1349 | if (opt_no_consumer) { |
| 1350 | MSG("The option --no-consumer is obsolete. Use --no-output now."); |
| 1351 | ret = CMD_WARNING; |
| 1352 | goto end; |
| 1353 | } |
| 1354 | |
| 1355 | /* Spawn a session daemon if needed */ |
| 1356 | if (!opt_no_sessiond) { |
| 1357 | ret = launch_sessiond(); |
| 1358 | if (ret) { |
| 1359 | ret = CMD_ERROR; |
| 1360 | goto end; |
| 1361 | } |
| 1362 | } |
| 1363 | |
| 1364 | /* MI initialization */ |
| 1365 | if (lttng_opt_mi) { |
| 1366 | writer = mi_lttng_writer_create(fileno(stdout), lttng_opt_mi); |
| 1367 | if (!writer) { |
| 1368 | ret = -LTTNG_ERR_NOMEM; |
| 1369 | goto end; |
| 1370 | } |
| 1371 | |
| 1372 | /* Open command element */ |
| 1373 | ret = mi_lttng_writer_command_open(writer, |
| 1374 | mi_lttng_element_command_create); |
| 1375 | if (ret) { |
| 1376 | ret = CMD_ERROR; |
| 1377 | goto end; |
| 1378 | } |
| 1379 | |
| 1380 | /* Open output element */ |
| 1381 | ret = mi_lttng_writer_open_element(writer, |
| 1382 | mi_lttng_element_command_output); |
| 1383 | if (ret) { |
| 1384 | ret = CMD_ERROR; |
| 1385 | goto end; |
| 1386 | } |
| 1387 | } |
| 1388 | opt_session_name = (char*) poptGetArg(pc); |
| 1389 | |
| 1390 | command_ret = create_session(); |
| 1391 | |
| 1392 | if (command_ret) { |
| 1393 | success = 0; |
| 1394 | } |
| 1395 | |
| 1396 | if (lttng_opt_mi) { |
| 1397 | /* Close output element */ |
| 1398 | ret = mi_lttng_writer_close_element(writer); |
| 1399 | if (ret) { |
| 1400 | ret = CMD_ERROR; |
| 1401 | goto end; |
| 1402 | } |
| 1403 | |
| 1404 | /* Success ? */ |
| 1405 | ret = mi_lttng_writer_write_element_bool(writer, |
| 1406 | mi_lttng_element_command_success, success); |
| 1407 | if (ret) { |
| 1408 | ret = CMD_ERROR; |
| 1409 | goto end; |
| 1410 | } |
| 1411 | |
| 1412 | /* Command element close */ |
| 1413 | ret = mi_lttng_writer_command_close(writer); |
| 1414 | if (ret) { |
| 1415 | ret = CMD_ERROR; |
| 1416 | goto end; |
| 1417 | } |
| 1418 | } |
| 1419 | |
| 1420 | end: |
| 1421 | /* Mi clean-up */ |
| 1422 | if (writer && mi_lttng_writer_destroy(writer)) { |
| 1423 | /* Preserve original error code */ |
| 1424 | ret = ret ? ret : -LTTNG_ERR_MI_IO_FAIL; |
| 1425 | } |
| 1426 | |
| 1427 | /* Overwrite ret if an error occurred in create_session() */ |
| 1428 | ret = command_ret ? command_ret : ret; |
| 1429 | |
| 1430 | poptFreeContext(pc); |
| 1431 | return ret; |
| 1432 | } |