| 1 | /* |
| 2 | * Copyright (C) 2011 EfficiOS Inc. |
| 3 | * |
| 4 | * SPDX-License-Identifier: GPL-2.0-only |
| 5 | * |
| 6 | */ |
| 7 | |
| 8 | #define _LGPL_SOURCE |
| 9 | #include <common/compat/getenv.hpp> |
| 10 | #include <common/compat/string.hpp> |
| 11 | #include <common/make-unique-wrapper.hpp> |
| 12 | #include <common/scope-exit.hpp> |
| 13 | #include <common/sessiond-comm/sessiond-comm.hpp> |
| 14 | #include <common/string-utils/string-utils.hpp> |
| 15 | #include <common/utils.hpp> |
| 16 | |
| 17 | #include <ctype.h> |
| 18 | #include <inttypes.h> |
| 19 | #include <popt.h> |
| 20 | #include <sstream> |
| 21 | #include <stdio.h> |
| 22 | #include <stdlib.h> |
| 23 | #include <string> |
| 24 | #include <sys/stat.h> |
| 25 | #include <sys/types.h> |
| 26 | #include <unistd.h> |
| 27 | #include <vector> |
| 28 | |
| 29 | /* Mi dependancy */ |
| 30 | #include "../command.hpp" |
| 31 | #include "../loglevel.hpp" |
| 32 | #include "../uprobe.hpp" |
| 33 | |
| 34 | #include <common/mi-lttng.hpp> |
| 35 | |
| 36 | #include <lttng/domain-internal.hpp> |
| 37 | #include <lttng/event-internal.hpp> |
| 38 | |
| 39 | #if (LTTNG_SYMBOL_NAME_LEN == 256) |
| 40 | #define LTTNG_SYMBOL_NAME_LEN_SCANF_IS_A_BROKEN_API "255" |
| 41 | #endif |
| 42 | |
| 43 | namespace { |
| 44 | void _mi_lttng_writer_deleter_func(mi_writer *writer) |
| 45 | { |
| 46 | if (writer && mi_lttng_writer_destroy(writer)) { |
| 47 | LTTNG_THROW_ERROR("Failed to destroy mi_writer instance"); |
| 48 | } |
| 49 | } |
| 50 | |
| 51 | using mi_writer_uptr = std::unique_ptr< |
| 52 | mi_writer, |
| 53 | lttng::memory::create_deleter_class<mi_writer, _mi_lttng_writer_deleter_func>::deleter>; |
| 54 | using event_rule_patterns = std::vector<std::string>; |
| 55 | |
| 56 | int opt_event_type; |
| 57 | const char *opt_loglevel; |
| 58 | int opt_loglevel_type; |
| 59 | int opt_kernel; |
| 60 | char *opt_session_name; |
| 61 | int opt_userspace; |
| 62 | int opt_jul; |
| 63 | int opt_log4j; |
| 64 | int opt_python; |
| 65 | int opt_enable_all; |
| 66 | char *opt_probe; |
| 67 | char *opt_userspace_probe; |
| 68 | char *opt_function; |
| 69 | char *opt_channel_name; |
| 70 | char *opt_filter; |
| 71 | char *opt_exclude; |
| 72 | |
| 73 | struct lttng_handle *handle; |
| 74 | mi_writer_uptr writer; |
| 75 | |
| 76 | #ifdef LTTNG_EMBED_HELP |
| 77 | static const char help_msg[] = |
| 78 | #include <lttng-enable-event.1.h> |
| 79 | ; |
| 80 | #endif |
| 81 | |
| 82 | enum { |
| 83 | OPT_HELP = 1, |
| 84 | OPT_TRACEPOINT, |
| 85 | OPT_PROBE, |
| 86 | OPT_USERSPACE_PROBE, |
| 87 | OPT_FUNCTION, |
| 88 | OPT_SYSCALL, |
| 89 | OPT_USERSPACE, |
| 90 | OPT_LOGLEVEL, |
| 91 | OPT_LOGLEVEL_ONLY, |
| 92 | OPT_LIST_OPTIONS, |
| 93 | OPT_FILTER, |
| 94 | OPT_EXCLUDE, |
| 95 | }; |
| 96 | |
| 97 | struct poptOption long_options[] = { |
| 98 | /* longName, shortName, argInfo, argPtr, value, descrip, argDesc */ |
| 99 | { "help", 'h', POPT_ARG_NONE, nullptr, OPT_HELP, nullptr, nullptr }, |
| 100 | { "session", 's', POPT_ARG_STRING, &opt_session_name, 0, nullptr, nullptr }, |
| 101 | { "all", 'a', POPT_ARG_VAL, &opt_enable_all, 1, nullptr, nullptr }, |
| 102 | { "channel", 'c', POPT_ARG_STRING, &opt_channel_name, 0, nullptr, nullptr }, |
| 103 | { "kernel", 'k', POPT_ARG_VAL, &opt_kernel, 1, nullptr, nullptr }, |
| 104 | { "userspace", 'u', POPT_ARG_NONE, nullptr, OPT_USERSPACE, nullptr, nullptr }, |
| 105 | { "jul", 'j', POPT_ARG_VAL, &opt_jul, 1, nullptr, nullptr }, |
| 106 | { "log4j", 'l', POPT_ARG_VAL, &opt_log4j, 1, nullptr, nullptr }, |
| 107 | { "python", 'p', POPT_ARG_VAL, &opt_python, 1, nullptr, nullptr }, |
| 108 | { "tracepoint", 0, POPT_ARG_NONE, nullptr, OPT_TRACEPOINT, nullptr, nullptr }, |
| 109 | { "probe", 0, POPT_ARG_STRING, &opt_probe, OPT_PROBE, nullptr, nullptr }, |
| 110 | { "userspace-probe", |
| 111 | 0, |
| 112 | POPT_ARG_STRING, |
| 113 | &opt_userspace_probe, |
| 114 | OPT_USERSPACE_PROBE, |
| 115 | nullptr, |
| 116 | nullptr }, |
| 117 | { "function", 0, POPT_ARG_STRING, &opt_function, OPT_FUNCTION, nullptr, nullptr }, |
| 118 | { "syscall", 0, POPT_ARG_NONE, nullptr, OPT_SYSCALL, nullptr, nullptr }, |
| 119 | { "loglevel", 0, POPT_ARG_STRING, nullptr, OPT_LOGLEVEL, nullptr, nullptr }, |
| 120 | { "loglevel-only", 0, POPT_ARG_STRING, nullptr, OPT_LOGLEVEL_ONLY, nullptr, nullptr }, |
| 121 | { "list-options", 0, POPT_ARG_NONE, nullptr, OPT_LIST_OPTIONS, nullptr, nullptr }, |
| 122 | { "filter", 'f', POPT_ARG_STRING, &opt_filter, OPT_FILTER, nullptr, nullptr }, |
| 123 | { "exclude", 'x', POPT_ARG_STRING, &opt_exclude, OPT_EXCLUDE, nullptr, nullptr }, |
| 124 | { nullptr, 0, 0, nullptr, 0, nullptr, nullptr } |
| 125 | }; |
| 126 | |
| 127 | /* |
| 128 | * Parse probe options. |
| 129 | */ |
| 130 | int parse_probe_opts(struct lttng_event *ev, char *opt) |
| 131 | { |
| 132 | int ret = CMD_SUCCESS; |
| 133 | int match; |
| 134 | char s_hex[19]; |
| 135 | #define S_HEX_LEN_SCANF_IS_A_BROKEN_API "18" /* 18 is (19 - 1) (\0 is extra) */ |
| 136 | char name[LTTNG_SYMBOL_NAME_LEN]; |
| 137 | |
| 138 | if (opt == nullptr) { |
| 139 | ret = CMD_ERROR; |
| 140 | goto end; |
| 141 | } |
| 142 | |
| 143 | /* Check for symbol+offset */ |
| 144 | match = sscanf(opt, |
| 145 | "%" LTTNG_SYMBOL_NAME_LEN_SCANF_IS_A_BROKEN_API |
| 146 | "[^'+']+%" S_HEX_LEN_SCANF_IS_A_BROKEN_API "s", |
| 147 | name, |
| 148 | s_hex); |
| 149 | if (match == 2) { |
| 150 | strncpy(ev->attr.probe.symbol_name, name, LTTNG_SYMBOL_NAME_LEN); |
| 151 | ev->attr.probe.symbol_name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; |
| 152 | DBG("probe symbol %s", ev->attr.probe.symbol_name); |
| 153 | if (*s_hex == '\0') { |
| 154 | ERR("Invalid probe offset %s", s_hex); |
| 155 | ret = CMD_ERROR; |
| 156 | goto end; |
| 157 | } |
| 158 | ev->attr.probe.offset = strtoull(s_hex, nullptr, 0); |
| 159 | DBG("probe offset %" PRIu64, ev->attr.probe.offset); |
| 160 | ev->attr.probe.addr = 0; |
| 161 | goto end; |
| 162 | } |
| 163 | |
| 164 | /* Check for symbol */ |
| 165 | if (isalpha(name[0]) || name[0] == '_') { |
| 166 | match = sscanf(opt, "%" LTTNG_SYMBOL_NAME_LEN_SCANF_IS_A_BROKEN_API "s", name); |
| 167 | if (match == 1) { |
| 168 | strncpy(ev->attr.probe.symbol_name, name, LTTNG_SYMBOL_NAME_LEN); |
| 169 | ev->attr.probe.symbol_name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; |
| 170 | DBG("probe symbol %s", ev->attr.probe.symbol_name); |
| 171 | ev->attr.probe.offset = 0; |
| 172 | DBG("probe offset %" PRIu64, ev->attr.probe.offset); |
| 173 | ev->attr.probe.addr = 0; |
| 174 | goto end; |
| 175 | } |
| 176 | } |
| 177 | |
| 178 | /* Check for address */ |
| 179 | match = sscanf(opt, "%" S_HEX_LEN_SCANF_IS_A_BROKEN_API "s", s_hex); |
| 180 | if (match > 0) { |
| 181 | /* |
| 182 | * Return an error if the first character of the tentative |
| 183 | * address is NULL or not a digit. It can be "0" if the address |
| 184 | * is in hexadecimal and can be 1 to 9 if it's in decimal. |
| 185 | */ |
| 186 | if (*s_hex == '\0' || !isdigit(*s_hex)) { |
| 187 | ERR("Invalid probe description `%s`", s_hex); |
| 188 | ret = CMD_ERROR; |
| 189 | goto end; |
| 190 | } |
| 191 | ev->attr.probe.addr = strtoull(s_hex, nullptr, 0); |
| 192 | DBG("probe addr %" PRIu64, ev->attr.probe.addr); |
| 193 | ev->attr.probe.offset = 0; |
| 194 | memset(ev->attr.probe.symbol_name, 0, LTTNG_SYMBOL_NAME_LEN); |
| 195 | goto end; |
| 196 | } |
| 197 | |
| 198 | /* No match */ |
| 199 | ret = CMD_ERROR; |
| 200 | |
| 201 | end: |
| 202 | return ret; |
| 203 | } |
| 204 | |
| 205 | const char *print_channel_name(const char *name) |
| 206 | { |
| 207 | return name ?: DEFAULT_CHANNEL_NAME; |
| 208 | } |
| 209 | |
| 210 | const char *print_raw_channel_name(const char *name) |
| 211 | { |
| 212 | return name ?: "<default>"; |
| 213 | } |
| 214 | |
| 215 | /* |
| 216 | * Mi print exlcusion list |
| 217 | */ |
| 218 | int mi_print_exclusion(const struct lttng_dynamic_pointer_array *exclusions) |
| 219 | { |
| 220 | int ret; |
| 221 | size_t i; |
| 222 | const size_t count = lttng_dynamic_pointer_array_get_count(exclusions); |
| 223 | |
| 224 | LTTNG_ASSERT(writer); |
| 225 | |
| 226 | if (count == 0) { |
| 227 | ret = 0; |
| 228 | goto end; |
| 229 | } |
| 230 | |
| 231 | ret = mi_lttng_writer_open_element(writer.get(), config_element_exclusions); |
| 232 | if (ret) { |
| 233 | goto end; |
| 234 | } |
| 235 | |
| 236 | for (i = 0; i < count; i++) { |
| 237 | const char *exclusion = |
| 238 | (const char *) lttng_dynamic_pointer_array_get_pointer(exclusions, i); |
| 239 | |
| 240 | ret = mi_lttng_writer_write_element_string( |
| 241 | writer.get(), config_element_exclusion, exclusion); |
| 242 | if (ret) { |
| 243 | goto end; |
| 244 | } |
| 245 | } |
| 246 | |
| 247 | /* Close exclusions element */ |
| 248 | ret = mi_lttng_writer_close_element(writer.get()); |
| 249 | |
| 250 | end: |
| 251 | return ret; |
| 252 | } |
| 253 | |
| 254 | /* |
| 255 | * Return allocated string for pretty-printing exclusion names. |
| 256 | */ |
| 257 | char *print_exclusions(const struct lttng_dynamic_pointer_array *exclusions) |
| 258 | { |
| 259 | int length = 0; |
| 260 | size_t i; |
| 261 | const char preamble[] = " excluding "; |
| 262 | char *ret; |
| 263 | const size_t count = lttng_dynamic_pointer_array_get_count(exclusions); |
| 264 | |
| 265 | if (count == 0) { |
| 266 | return strdup(""); |
| 267 | } |
| 268 | |
| 269 | /* Calculate total required length. */ |
| 270 | for (i = 0; i < count; i++) { |
| 271 | const char *exclusion = |
| 272 | (const char *) lttng_dynamic_pointer_array_get_pointer(exclusions, i); |
| 273 | |
| 274 | length += strlen(exclusion) + 4; |
| 275 | } |
| 276 | |
| 277 | length += sizeof(preamble); |
| 278 | ret = calloc<char>(length); |
| 279 | if (!ret) { |
| 280 | return nullptr; |
| 281 | } |
| 282 | |
| 283 | strncpy(ret, preamble, length); |
| 284 | for (i = 0; i < count; i++) { |
| 285 | const char *exclusion = |
| 286 | (const char *) lttng_dynamic_pointer_array_get_pointer(exclusions, i); |
| 287 | |
| 288 | strcat(ret, "`"); |
| 289 | strcat(ret, exclusion); |
| 290 | strcat(ret, "`"); |
| 291 | if (i != count - 1) { |
| 292 | strcat(ret, ", "); |
| 293 | } |
| 294 | } |
| 295 | |
| 296 | return ret; |
| 297 | } |
| 298 | |
| 299 | int check_exclusion_subsets(const char *pattern, const char *exclusion) |
| 300 | { |
| 301 | bool warn = false; |
| 302 | int ret = 0; |
| 303 | const char *e = pattern; |
| 304 | const char *x = exclusion; |
| 305 | |
| 306 | /* Scan both the excluder and the event letter by letter */ |
| 307 | while (true) { |
| 308 | if (*e == '\\') { |
| 309 | if (*x != *e) { |
| 310 | warn = true; |
| 311 | goto end; |
| 312 | } |
| 313 | |
| 314 | e++; |
| 315 | x++; |
| 316 | goto cmp_chars; |
| 317 | } |
| 318 | |
| 319 | if (*x == '*') { |
| 320 | /* Event is a subset of the excluder */ |
| 321 | ERR("Exclusion pattern `%s` excludes all events from `%s`", |
| 322 | exclusion, |
| 323 | pattern); |
| 324 | goto error; |
| 325 | } |
| 326 | |
| 327 | if (*e == '*') { |
| 328 | /* |
| 329 | * Reached the end of the event name before the |
| 330 | * end of the exclusion: this is valid. |
| 331 | */ |
| 332 | goto end; |
| 333 | } |
| 334 | |
| 335 | cmp_chars: |
| 336 | if (*x != *e) { |
| 337 | warn = true; |
| 338 | break; |
| 339 | } |
| 340 | |
| 341 | x++; |
| 342 | e++; |
| 343 | } |
| 344 | |
| 345 | goto end; |
| 346 | |
| 347 | error: |
| 348 | ret = -1; |
| 349 | |
| 350 | end: |
| 351 | if (warn) { |
| 352 | WARN("Exclusion pattern `%s` does not exclude any event from `%s`", |
| 353 | exclusion, |
| 354 | pattern); |
| 355 | } |
| 356 | |
| 357 | return ret; |
| 358 | } |
| 359 | |
| 360 | int create_exclusion_list_and_validate(const char *pattern, |
| 361 | const char *exclusions_arg, |
| 362 | struct lttng_dynamic_pointer_array *exclusions) |
| 363 | { |
| 364 | int ret = 0; |
| 365 | |
| 366 | /* Split exclusions. */ |
| 367 | ret = strutils_split(exclusions_arg, ',', true, exclusions); |
| 368 | if (ret < 0) { |
| 369 | goto error; |
| 370 | } |
| 371 | |
| 372 | if (validate_exclusion_list(pattern, exclusions) != 0) { |
| 373 | goto error; |
| 374 | } |
| 375 | |
| 376 | goto end; |
| 377 | |
| 378 | error: |
| 379 | ret = -1; |
| 380 | lttng_dynamic_pointer_array_reset(exclusions); |
| 381 | |
| 382 | end: |
| 383 | return ret; |
| 384 | } |
| 385 | |
| 386 | void warn_on_truncated_exclusion_names(const struct lttng_dynamic_pointer_array *exclusions, |
| 387 | int *warn) |
| 388 | { |
| 389 | size_t i; |
| 390 | const size_t num_exclusions = lttng_dynamic_pointer_array_get_count(exclusions); |
| 391 | |
| 392 | for (i = 0; i < num_exclusions; i++) { |
| 393 | const char *const exclusion = |
| 394 | (const char *) lttng_dynamic_pointer_array_get_pointer(exclusions, i); |
| 395 | |
| 396 | if (strlen(exclusion) >= LTTNG_SYMBOL_NAME_LEN) { |
| 397 | WARN("Event exclusion \"%s\" will be truncated", exclusion); |
| 398 | *warn = 1; |
| 399 | } |
| 400 | } |
| 401 | } |
| 402 | |
| 403 | /* |
| 404 | * Enabling event using the lttng API. |
| 405 | * Note: in case of error only the last error code will be return. |
| 406 | */ |
| 407 | int enable_events(const std::string& session_name, const event_rule_patterns& patterns) |
| 408 | { |
| 409 | int ret = CMD_SUCCESS, command_ret = CMD_SUCCESS; |
| 410 | int error_holder = CMD_SUCCESS, warn = 0, error = 0, success = 1; |
| 411 | char *channel_name = nullptr; |
| 412 | struct lttng_event *ev; |
| 413 | struct lttng_domain dom = {}; |
| 414 | struct lttng_dynamic_pointer_array exclusions; |
| 415 | struct lttng_userspace_probe_location *uprobe_loc = nullptr; |
| 416 | |
| 417 | lttng_dynamic_pointer_array_init(&exclusions, nullptr); |
| 418 | |
| 419 | ev = lttng_event_create(); |
| 420 | if (!ev) { |
| 421 | ret = CMD_ERROR; |
| 422 | goto error; |
| 423 | } |
| 424 | |
| 425 | if (opt_kernel) { |
| 426 | if (opt_loglevel) { |
| 427 | WARN("Kernel log levels are not supported"); |
| 428 | } |
| 429 | } |
| 430 | |
| 431 | /* Create lttng domain */ |
| 432 | if (opt_kernel) { |
| 433 | dom.type = LTTNG_DOMAIN_KERNEL; |
| 434 | dom.buf_type = LTTNG_BUFFER_GLOBAL; |
| 435 | } else if (opt_userspace) { |
| 436 | dom.type = LTTNG_DOMAIN_UST; |
| 437 | /* Default. */ |
| 438 | dom.buf_type = LTTNG_BUFFER_PER_UID; |
| 439 | } else if (opt_jul) { |
| 440 | dom.type = LTTNG_DOMAIN_JUL; |
| 441 | /* Default. */ |
| 442 | dom.buf_type = LTTNG_BUFFER_PER_UID; |
| 443 | } else if (opt_log4j) { |
| 444 | dom.type = LTTNG_DOMAIN_LOG4J; |
| 445 | /* Default. */ |
| 446 | dom.buf_type = LTTNG_BUFFER_PER_UID; |
| 447 | } else if (opt_python) { |
| 448 | dom.type = LTTNG_DOMAIN_PYTHON; |
| 449 | /* Default. */ |
| 450 | dom.buf_type = LTTNG_BUFFER_PER_UID; |
| 451 | } else { |
| 452 | /* Checked by the caller. */ |
| 453 | abort(); |
| 454 | } |
| 455 | |
| 456 | if (opt_exclude) { |
| 457 | switch (dom.type) { |
| 458 | case LTTNG_DOMAIN_KERNEL: |
| 459 | case LTTNG_DOMAIN_JUL: |
| 460 | case LTTNG_DOMAIN_LOG4J: |
| 461 | case LTTNG_DOMAIN_PYTHON: |
| 462 | ERR("Event name exclusions are not supported for %s event rules", |
| 463 | lttng_domain_type_str(dom.type)); |
| 464 | ret = CMD_ERROR; |
| 465 | goto error; |
| 466 | case LTTNG_DOMAIN_UST: |
| 467 | /* Exclusions supported */ |
| 468 | break; |
| 469 | default: |
| 470 | abort(); |
| 471 | } |
| 472 | } |
| 473 | |
| 474 | /* |
| 475 | * Adding a filter to a probe, function or userspace-probe would be |
| 476 | * denied by the kernel tracer as it's not supported at the moment. We |
| 477 | * do an early check here to warn the user. |
| 478 | */ |
| 479 | if (opt_filter && opt_kernel) { |
| 480 | switch (opt_event_type) { |
| 481 | case LTTNG_EVENT_ALL: |
| 482 | case LTTNG_EVENT_TRACEPOINT: |
| 483 | case LTTNG_EVENT_SYSCALL: |
| 484 | break; |
| 485 | case LTTNG_EVENT_PROBE: |
| 486 | case LTTNG_EVENT_USERSPACE_PROBE: |
| 487 | case LTTNG_EVENT_FUNCTION: |
| 488 | ERR("Filter expressions are not supported for %s event rules", |
| 489 | get_event_type_str((lttng_event_type) opt_event_type)); |
| 490 | ret = CMD_ERROR; |
| 491 | goto error; |
| 492 | default: |
| 493 | ret = CMD_UNDEFINED; |
| 494 | goto error; |
| 495 | } |
| 496 | } |
| 497 | |
| 498 | channel_name = opt_channel_name; |
| 499 | |
| 500 | handle = lttng_create_handle(session_name.c_str(), &dom); |
| 501 | if (handle == nullptr) { |
| 502 | ret = -1; |
| 503 | goto error; |
| 504 | } |
| 505 | |
| 506 | /* Prepare Mi */ |
| 507 | if (lttng_opt_mi) { |
| 508 | /* Open a events element */ |
| 509 | ret = mi_lttng_writer_open_element(writer.get(), config_element_events); |
| 510 | if (ret) { |
| 511 | ret = CMD_ERROR; |
| 512 | goto error; |
| 513 | } |
| 514 | } |
| 515 | |
| 516 | for (const auto& pattern : patterns) { |
| 517 | /* Copy name and type of the event */ |
| 518 | strncpy(ev->name, pattern.c_str(), LTTNG_SYMBOL_NAME_LEN); |
| 519 | ev->name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; |
| 520 | ev->type = (lttng_event_type) opt_event_type; |
| 521 | |
| 522 | /* Kernel tracer action */ |
| 523 | if (opt_kernel) { |
| 524 | DBG_FMT("Enabling kernel event rule: pattern=`{}`, channel_name=`{}`", |
| 525 | pattern, |
| 526 | print_channel_name(channel_name)); |
| 527 | |
| 528 | switch (opt_event_type) { |
| 529 | case LTTNG_EVENT_ALL: /* Enable tracepoints and syscalls */ |
| 530 | /* If event name differs from *, select tracepoint. */ |
| 531 | if (strcmp(ev->name, "*") != 0) { |
| 532 | ev->type = LTTNG_EVENT_TRACEPOINT; |
| 533 | } |
| 534 | break; |
| 535 | case LTTNG_EVENT_TRACEPOINT: |
| 536 | break; |
| 537 | case LTTNG_EVENT_PROBE: |
| 538 | ret = parse_probe_opts(ev, opt_probe); |
| 539 | if (ret) { |
| 540 | ERR("Unable to parse probe options"); |
| 541 | ret = CMD_ERROR; |
| 542 | goto error; |
| 543 | } |
| 544 | break; |
| 545 | case LTTNG_EVENT_USERSPACE_PROBE: |
| 546 | LTTNG_ASSERT(ev->type == LTTNG_EVENT_USERSPACE_PROBE); |
| 547 | |
| 548 | ret = parse_userspace_probe_opts(opt_userspace_probe, &uprobe_loc); |
| 549 | if (ret) { |
| 550 | switch (ret) { |
| 551 | case CMD_UNSUPPORTED: |
| 552 | /* |
| 553 | * Error message describing |
| 554 | * what is not supported was |
| 555 | * printed in the function. |
| 556 | */ |
| 557 | break; |
| 558 | case CMD_ERROR: |
| 559 | default: |
| 560 | ERR("Unable to parse user space probe options"); |
| 561 | break; |
| 562 | } |
| 563 | goto error; |
| 564 | } |
| 565 | |
| 566 | ret = lttng_event_set_userspace_probe_location(ev, uprobe_loc); |
| 567 | if (ret) { |
| 568 | WARN("Failed to set probe location on event"); |
| 569 | ret = CMD_ERROR; |
| 570 | goto error; |
| 571 | } |
| 572 | |
| 573 | /* Ownership of the uprobe location was transferred to the event. */ |
| 574 | uprobe_loc = nullptr; |
| 575 | break; |
| 576 | case LTTNG_EVENT_FUNCTION: |
| 577 | ret = parse_probe_opts(ev, opt_function); |
| 578 | if (ret) { |
| 579 | ERR("Unable to parse function probe options"); |
| 580 | ret = CMD_ERROR; |
| 581 | goto error; |
| 582 | } |
| 583 | break; |
| 584 | case LTTNG_EVENT_SYSCALL: |
| 585 | ev->type = LTTNG_EVENT_SYSCALL; |
| 586 | break; |
| 587 | default: |
| 588 | ret = CMD_UNDEFINED; |
| 589 | goto error; |
| 590 | } |
| 591 | |
| 592 | /* kernel loglevels not implemented */ |
| 593 | ev->loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL; |
| 594 | } else if (opt_userspace) { /* User-space tracer action */ |
| 595 | DBG_FMT("Enabling user space event rule: pattern=`{}`, channel_name=`{}`, log_level=`{}`", |
| 596 | pattern.c_str(), |
| 597 | print_channel_name(channel_name), |
| 598 | opt_loglevel ?: "all"); |
| 599 | |
| 600 | switch (opt_event_type) { |
| 601 | case LTTNG_EVENT_ALL: /* Default behavior is tracepoint */ |
| 602 | /* Fall-through */ |
| 603 | case LTTNG_EVENT_TRACEPOINT: |
| 604 | /* Copy name and type of the event */ |
| 605 | ev->type = LTTNG_EVENT_TRACEPOINT; |
| 606 | strncpy(ev->name, pattern.c_str(), LTTNG_SYMBOL_NAME_LEN); |
| 607 | ev->name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; |
| 608 | break; |
| 609 | case LTTNG_EVENT_PROBE: |
| 610 | case LTTNG_EVENT_FUNCTION: |
| 611 | case LTTNG_EVENT_SYSCALL: |
| 612 | case LTTNG_EVENT_USERSPACE_PROBE: |
| 613 | default: |
| 614 | ERR("Instrumentation point type not supported for the %s domain", |
| 615 | lttng_domain_type_str(dom.type)); |
| 616 | ret = CMD_UNSUPPORTED; |
| 617 | goto error; |
| 618 | } |
| 619 | |
| 620 | if (opt_exclude) { |
| 621 | ev->exclusion = 1; |
| 622 | if (opt_event_type != LTTNG_EVENT_ALL && |
| 623 | opt_event_type != LTTNG_EVENT_TRACEPOINT) { |
| 624 | ERR("Exclusion option can only be used with tracepoint events"); |
| 625 | ret = CMD_ERROR; |
| 626 | goto error; |
| 627 | } |
| 628 | /* Free previously allocated items. */ |
| 629 | lttng_dynamic_pointer_array_reset(&exclusions); |
| 630 | ret = create_exclusion_list_and_validate( |
| 631 | pattern.c_str(), opt_exclude, &exclusions); |
| 632 | if (ret) { |
| 633 | ret = CMD_ERROR; |
| 634 | goto error; |
| 635 | } |
| 636 | |
| 637 | warn_on_truncated_exclusion_names(&exclusions, &warn); |
| 638 | } |
| 639 | |
| 640 | ev->loglevel_type = (lttng_loglevel_type) opt_loglevel_type; |
| 641 | if (opt_loglevel) { |
| 642 | enum lttng_loglevel loglevel; |
| 643 | const int name_search_ret = |
| 644 | loglevel_name_to_value(opt_loglevel, &loglevel); |
| 645 | |
| 646 | if (name_search_ret == -1) { |
| 647 | ERR("Unknown log level `%s`", opt_loglevel); |
| 648 | ret = -LTTNG_ERR_INVALID; |
| 649 | goto error; |
| 650 | } |
| 651 | |
| 652 | ev->loglevel = (int) loglevel; |
| 653 | } else { |
| 654 | ev->loglevel = -1; |
| 655 | } |
| 656 | } else if (opt_jul || opt_log4j || opt_python) { |
| 657 | if (opt_event_type != LTTNG_EVENT_ALL && |
| 658 | opt_event_type != LTTNG_EVENT_TRACEPOINT) { |
| 659 | ERR("Instrumentation point type not supported for the %s domain", |
| 660 | lttng_domain_type_str(dom.type)); |
| 661 | ret = CMD_UNSUPPORTED; |
| 662 | goto error; |
| 663 | } |
| 664 | |
| 665 | ev->loglevel_type = (lttng_loglevel_type) opt_loglevel_type; |
| 666 | if (opt_loglevel) { |
| 667 | int name_search_ret; |
| 668 | |
| 669 | if (opt_jul) { |
| 670 | enum lttng_loglevel_jul loglevel; |
| 671 | |
| 672 | name_search_ret = |
| 673 | loglevel_jul_name_to_value(opt_loglevel, &loglevel); |
| 674 | ev->loglevel = (int) loglevel; |
| 675 | } else if (opt_log4j) { |
| 676 | enum lttng_loglevel_log4j loglevel; |
| 677 | |
| 678 | name_search_ret = loglevel_log4j_name_to_value(opt_loglevel, |
| 679 | &loglevel); |
| 680 | ev->loglevel = (int) loglevel; |
| 681 | } else { |
| 682 | /* python domain. */ |
| 683 | enum lttng_loglevel_python loglevel; |
| 684 | |
| 685 | name_search_ret = loglevel_python_name_to_value( |
| 686 | opt_loglevel, &loglevel); |
| 687 | ev->loglevel = (int) loglevel; |
| 688 | } |
| 689 | |
| 690 | if (name_search_ret) { |
| 691 | ERR("Unknown log level `%s`", opt_loglevel); |
| 692 | ret = -LTTNG_ERR_INVALID; |
| 693 | goto error; |
| 694 | } |
| 695 | } else { |
| 696 | if (opt_jul) { |
| 697 | ev->loglevel = LTTNG_LOGLEVEL_JUL_ALL; |
| 698 | } else if (opt_log4j) { |
| 699 | ev->loglevel = LTTNG_LOGLEVEL_LOG4J_ALL; |
| 700 | } else if (opt_python) { |
| 701 | ev->loglevel = LTTNG_LOGLEVEL_PYTHON_DEBUG; |
| 702 | } |
| 703 | } |
| 704 | ev->type = LTTNG_EVENT_TRACEPOINT; |
| 705 | strncpy(ev->name, pattern.c_str(), LTTNG_SYMBOL_NAME_LEN); |
| 706 | ev->name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; |
| 707 | } else { |
| 708 | abort(); |
| 709 | } |
| 710 | |
| 711 | if (!opt_filter) { |
| 712 | command_ret = lttng_enable_event_with_exclusions( |
| 713 | handle, |
| 714 | ev, |
| 715 | channel_name, |
| 716 | nullptr, |
| 717 | lttng_dynamic_pointer_array_get_count(&exclusions), |
| 718 | (char **) exclusions.array.buffer.data); |
| 719 | |
| 720 | auto exclusion_string = lttng::make_unique_wrapper<char, lttng::free>( |
| 721 | print_exclusions(&exclusions)); |
| 722 | if (!exclusion_string) { |
| 723 | PERROR("Cannot allocate exclusion_string"); |
| 724 | error = 1; |
| 725 | goto end; |
| 726 | } |
| 727 | |
| 728 | if (command_ret < 0) { |
| 729 | /* Turn ret to positive value to handle the positive error code */ |
| 730 | switch (-command_ret) { |
| 731 | case LTTNG_ERR_KERN_EVENT_EXIST: |
| 732 | WARN("Kernel event rule %s%s and attached to channel `%s` is already enabled (session `%s`)", |
| 733 | opt_enable_all ? "matching all events" : |
| 734 | (std::string("with pattern `") + |
| 735 | pattern + std::string("`")) |
| 736 | .c_str(), |
| 737 | exclusion_string.get(), |
| 738 | print_channel_name(channel_name), |
| 739 | session_name.c_str()); |
| 740 | warn = 1; |
| 741 | break; |
| 742 | case LTTNG_ERR_TRACE_ALREADY_STARTED: |
| 743 | { |
| 744 | ERR("Can't enable an event in a new domain for a session that has already been started once (session `%s`)", |
| 745 | session_name.c_str()); |
| 746 | error = 1; |
| 747 | break; |
| 748 | } |
| 749 | case LTTNG_ERR_SDT_PROBE_SEMAPHORE: |
| 750 | ERR("Failed to enable event rule with pattern `%s` and attached to channel `%s` as SDT probes guarded by semaphores are not supported (session `%s`)", |
| 751 | pattern.c_str(), |
| 752 | print_channel_name(channel_name), |
| 753 | session_name.c_str()); |
| 754 | error = 1; |
| 755 | break; |
| 756 | default: |
| 757 | ERR("Failed to enable event rule %s%s and attached to channel `%s`: %s (session `%s`)", |
| 758 | opt_enable_all ? "matching all events" : |
| 759 | (std::string("with pattern `") + |
| 760 | pattern + std::string("`")) |
| 761 | .c_str(), |
| 762 | exclusion_string.get(), |
| 763 | command_ret == -LTTNG_ERR_NEED_CHANNEL_NAME ? |
| 764 | print_raw_channel_name(channel_name) : |
| 765 | print_channel_name(channel_name), |
| 766 | lttng_strerror(command_ret), |
| 767 | session_name.c_str()); |
| 768 | |
| 769 | if (opt_kernel) { |
| 770 | print_kernel_tracer_status_error(); |
| 771 | } |
| 772 | |
| 773 | error = 1; |
| 774 | break; |
| 775 | } |
| 776 | error_holder = command_ret; |
| 777 | } else { |
| 778 | switch (dom.type) { |
| 779 | case LTTNG_DOMAIN_KERNEL: |
| 780 | case LTTNG_DOMAIN_UST: |
| 781 | { |
| 782 | MSG("Enabled %s event rule %s%s and attached to channel `%s`", |
| 783 | lttng_domain_type_str(dom.type), |
| 784 | opt_enable_all ? "matching all events" : |
| 785 | (std::string("with pattern `") + |
| 786 | pattern + std::string("`")) |
| 787 | .c_str(), |
| 788 | exclusion_string.get(), |
| 789 | print_channel_name(channel_name)); |
| 790 | break; |
| 791 | } |
| 792 | case LTTNG_DOMAIN_JUL: |
| 793 | case LTTNG_DOMAIN_LOG4J: |
| 794 | case LTTNG_DOMAIN_PYTHON: |
| 795 | /* |
| 796 | * Don't print the default channel |
| 797 | * name for agent domains. |
| 798 | */ |
| 799 | MSG("Enabled %s event rule %s%s", |
| 800 | lttng_domain_type_str(dom.type), |
| 801 | opt_enable_all ? "matching all events" : |
| 802 | (std::string("with pattern `") + |
| 803 | pattern + std::string("`")) |
| 804 | .c_str(), |
| 805 | exclusion_string.get()); |
| 806 | break; |
| 807 | default: |
| 808 | abort(); |
| 809 | } |
| 810 | } |
| 811 | } else { |
| 812 | /* Filter present */ |
| 813 | ev->filter = 1; |
| 814 | |
| 815 | command_ret = lttng_enable_event_with_exclusions( |
| 816 | handle, |
| 817 | ev, |
| 818 | channel_name, |
| 819 | opt_filter, |
| 820 | lttng_dynamic_pointer_array_get_count(&exclusions), |
| 821 | (char **) exclusions.array.buffer.data); |
| 822 | |
| 823 | auto exclusion_string = lttng::make_unique_wrapper<char, lttng::free>( |
| 824 | print_exclusions(&exclusions)); |
| 825 | if (!exclusion_string) { |
| 826 | PERROR("Failed allocate exclusion string"); |
| 827 | error = 1; |
| 828 | goto end; |
| 829 | } |
| 830 | if (command_ret < 0) { |
| 831 | switch (-command_ret) { |
| 832 | case LTTNG_ERR_FILTER_EXIST: |
| 833 | WARN("An event rule %s%s and filter expression `%s` is already attached to channel `%s`", |
| 834 | opt_enable_all ? "matching all events" : |
| 835 | (std::string("with pattern `") + |
| 836 | pattern + std::string("`")) |
| 837 | .c_str(), |
| 838 | exclusion_string.get(), |
| 839 | opt_filter, |
| 840 | print_channel_name(channel_name)); |
| 841 | warn = 1; |
| 842 | break; |
| 843 | case LTTNG_ERR_TRACE_ALREADY_STARTED: |
| 844 | { |
| 845 | ERR("Can't enable an event in a new domain for a session that has already been started once (session `%s`)", |
| 846 | session_name.c_str()); |
| 847 | error = 1; |
| 848 | break; |
| 849 | } |
| 850 | default: |
| 851 | ERR("Failed to enable event rule %s%s, with filter expression `%s`, and attached to channel `%s`: %s (session `%s`)", |
| 852 | opt_enable_all ? "matching all events" : |
| 853 | (std::string("with pattern `") + |
| 854 | pattern + std::string("`")) |
| 855 | .c_str(), |
| 856 | exclusion_string.get(), |
| 857 | opt_filter, |
| 858 | command_ret == -LTTNG_ERR_NEED_CHANNEL_NAME ? |
| 859 | print_raw_channel_name(channel_name) : |
| 860 | print_channel_name(channel_name), |
| 861 | lttng_strerror(command_ret), |
| 862 | session_name.c_str()); |
| 863 | error = 1; |
| 864 | |
| 865 | if (opt_kernel) { |
| 866 | print_kernel_tracer_status_error(); |
| 867 | } |
| 868 | |
| 869 | break; |
| 870 | } |
| 871 | |
| 872 | error_holder = command_ret; |
| 873 | } else { |
| 874 | MSG("Enabled %s event rule %s%s and filter expression `%s`", |
| 875 | lttng_domain_type_str(dom.type), |
| 876 | opt_enable_all ? "matching all events" : |
| 877 | (std::string("with pattern `") + pattern + |
| 878 | std::string("`")) |
| 879 | .c_str(), |
| 880 | |
| 881 | exclusion_string.get(), |
| 882 | opt_filter); |
| 883 | } |
| 884 | } |
| 885 | |
| 886 | if (lttng_opt_mi) { |
| 887 | if (command_ret) { |
| 888 | success = 0; |
| 889 | ev->enabled = 0; |
| 890 | } else { |
| 891 | ev->enabled = 1; |
| 892 | } |
| 893 | |
| 894 | ret = mi_lttng_event(writer.get(), ev, 1, handle->domain.type); |
| 895 | if (ret) { |
| 896 | ret = CMD_ERROR; |
| 897 | goto error; |
| 898 | } |
| 899 | |
| 900 | /* print exclusion */ |
| 901 | ret = mi_print_exclusion(&exclusions); |
| 902 | if (ret) { |
| 903 | ret = CMD_ERROR; |
| 904 | goto error; |
| 905 | } |
| 906 | |
| 907 | /* Success ? */ |
| 908 | ret = mi_lttng_writer_write_element_bool( |
| 909 | writer.get(), mi_lttng_element_command_success, success); |
| 910 | if (ret) { |
| 911 | ret = CMD_ERROR; |
| 912 | goto end; |
| 913 | } |
| 914 | |
| 915 | /* Close event element */ |
| 916 | ret = mi_lttng_writer_close_element(writer.get()); |
| 917 | if (ret) { |
| 918 | ret = CMD_ERROR; |
| 919 | goto end; |
| 920 | } |
| 921 | } |
| 922 | |
| 923 | /* Reset warn, error and success */ |
| 924 | success = 1; |
| 925 | } |
| 926 | |
| 927 | end: |
| 928 | /* Close Mi */ |
| 929 | if (lttng_opt_mi) { |
| 930 | /* Close events element */ |
| 931 | ret = mi_lttng_writer_close_element(writer.get()); |
| 932 | if (ret) { |
| 933 | ret = CMD_ERROR; |
| 934 | goto error; |
| 935 | } |
| 936 | } |
| 937 | error: |
| 938 | if (warn) { |
| 939 | ret = CMD_WARNING; |
| 940 | } |
| 941 | if (error) { |
| 942 | ret = CMD_ERROR; |
| 943 | } |
| 944 | lttng_destroy_handle(handle); |
| 945 | lttng_dynamic_pointer_array_reset(&exclusions); |
| 946 | lttng_userspace_probe_location_destroy(uprobe_loc); |
| 947 | |
| 948 | /* Overwrite ret with error_holder if there was an actual error with |
| 949 | * enabling an event. |
| 950 | */ |
| 951 | ret = error_holder ? error_holder : ret; |
| 952 | |
| 953 | lttng_event_destroy(ev); |
| 954 | return ret; |
| 955 | } |
| 956 | |
| 957 | void _poptContextFree_deleter_func(poptContext ctx) |
| 958 | { |
| 959 | poptFreeContext(ctx); |
| 960 | } |
| 961 | |
| 962 | } /* namespace */ |
| 963 | |
| 964 | int validate_exclusion_list(const char *pattern, |
| 965 | const struct lttng_dynamic_pointer_array *exclusions) |
| 966 | { |
| 967 | int ret; |
| 968 | |
| 969 | /* Event name pattern must be a valid globbing pattern to allow exclusions. */ |
| 970 | if (!strutils_is_star_glob_pattern(pattern)) { |
| 971 | ERR("Event name pattern must contain wildcard characters to use exclusions"); |
| 972 | goto error; |
| 973 | } |
| 974 | |
| 975 | /* |
| 976 | * If the event name is a star-at-end only globbing pattern, |
| 977 | * then we can validate the individual exclusions. Otherwise |
| 978 | * all exclusions are passed to the session daemon. |
| 979 | */ |
| 980 | if (strutils_is_star_at_the_end_only_glob_pattern(pattern)) { |
| 981 | size_t i, num_exclusions; |
| 982 | |
| 983 | num_exclusions = lttng_dynamic_pointer_array_get_count(exclusions); |
| 984 | |
| 985 | for (i = 0; i < num_exclusions; i++) { |
| 986 | const char *exclusion = |
| 987 | (const char *) lttng_dynamic_pointer_array_get_pointer(exclusions, |
| 988 | i); |
| 989 | |
| 990 | if (!strutils_is_star_glob_pattern(exclusion) || |
| 991 | strutils_is_star_at_the_end_only_glob_pattern(exclusion)) { |
| 992 | ret = check_exclusion_subsets(pattern, exclusion); |
| 993 | if (ret) { |
| 994 | goto error; |
| 995 | } |
| 996 | } |
| 997 | } |
| 998 | } |
| 999 | |
| 1000 | ret = 0; |
| 1001 | goto end; |
| 1002 | |
| 1003 | error: |
| 1004 | ret = -1; |
| 1005 | |
| 1006 | end: |
| 1007 | return ret; |
| 1008 | } |
| 1009 | |
| 1010 | /* |
| 1011 | * Add event to trace session |
| 1012 | */ |
| 1013 | int cmd_enable_events(int argc, const char **argv) |
| 1014 | { |
| 1015 | int opt, ret = CMD_SUCCESS, command_ret = CMD_SUCCESS, success = 1; |
| 1016 | std::string session_name; |
| 1017 | const char *arg_event_list = nullptr; |
| 1018 | const char *leftover = nullptr; |
| 1019 | int event_type = -1; |
| 1020 | event_rule_patterns patterns; |
| 1021 | |
| 1022 | auto pc = lttng::make_unique_wrapper<poptContext_s, _poptContextFree_deleter_func>( |
| 1023 | poptGetContext(nullptr, argc, argv, long_options, 0)); |
| 1024 | poptReadDefaultConfig(pc.get(), 0); |
| 1025 | |
| 1026 | /* Default event type */ |
| 1027 | opt_event_type = LTTNG_EVENT_ALL; |
| 1028 | |
| 1029 | while ((opt = poptGetNextOpt(pc.get())) != -1) { |
| 1030 | switch (opt) { |
| 1031 | case OPT_HELP: |
| 1032 | SHOW_HELP(); |
| 1033 | return CMD_SUCCESS; |
| 1034 | case OPT_TRACEPOINT: |
| 1035 | opt_event_type = LTTNG_EVENT_TRACEPOINT; |
| 1036 | break; |
| 1037 | case OPT_PROBE: |
| 1038 | opt_event_type = LTTNG_EVENT_PROBE; |
| 1039 | break; |
| 1040 | case OPT_USERSPACE_PROBE: |
| 1041 | opt_event_type = LTTNG_EVENT_USERSPACE_PROBE; |
| 1042 | break; |
| 1043 | case OPT_FUNCTION: |
| 1044 | opt_event_type = LTTNG_EVENT_FUNCTION; |
| 1045 | break; |
| 1046 | case OPT_SYSCALL: |
| 1047 | opt_event_type = LTTNG_EVENT_SYSCALL; |
| 1048 | break; |
| 1049 | case OPT_USERSPACE: |
| 1050 | opt_userspace = 1; |
| 1051 | break; |
| 1052 | case OPT_LOGLEVEL: |
| 1053 | opt_loglevel_type = LTTNG_EVENT_LOGLEVEL_RANGE; |
| 1054 | opt_loglevel = poptGetOptArg(pc.get()); |
| 1055 | break; |
| 1056 | case OPT_LOGLEVEL_ONLY: |
| 1057 | opt_loglevel_type = LTTNG_EVENT_LOGLEVEL_SINGLE; |
| 1058 | opt_loglevel = poptGetOptArg(pc.get()); |
| 1059 | break; |
| 1060 | case OPT_LIST_OPTIONS: |
| 1061 | list_cmd_options(stdout, long_options); |
| 1062 | return CMD_SUCCESS; |
| 1063 | case OPT_FILTER: |
| 1064 | break; |
| 1065 | case OPT_EXCLUDE: |
| 1066 | break; |
| 1067 | default: |
| 1068 | return CMD_UNDEFINED; |
| 1069 | } |
| 1070 | |
| 1071 | /* Validate event type. Multiple event type are not supported. */ |
| 1072 | if (event_type == -1) { |
| 1073 | event_type = opt_event_type; |
| 1074 | } else { |
| 1075 | if (event_type != opt_event_type) { |
| 1076 | ERR("Only one event type may be enabled at once"); |
| 1077 | return CMD_ERROR; |
| 1078 | } |
| 1079 | } |
| 1080 | } |
| 1081 | |
| 1082 | ret = print_missing_or_multiple_domains( |
| 1083 | opt_kernel + opt_userspace + opt_jul + opt_log4j + opt_python, true); |
| 1084 | if (ret) { |
| 1085 | return CMD_ERROR; |
| 1086 | } |
| 1087 | |
| 1088 | /* Mi check */ |
| 1089 | if (lttng_opt_mi) { |
| 1090 | writer = mi_writer_uptr(mi_lttng_writer_create(fileno(stdout), lttng_opt_mi)); |
| 1091 | if (!writer) { |
| 1092 | LTTNG_THROW_ERROR(lttng::format( |
| 1093 | "Failed to create MI writer: format_code={}", lttng_opt_mi)); |
| 1094 | } |
| 1095 | |
| 1096 | /* Open command element */ |
| 1097 | ret = mi_lttng_writer_command_open(writer.get(), |
| 1098 | mi_lttng_element_command_enable_event); |
| 1099 | if (ret) { |
| 1100 | LTTNG_THROW_ERROR(lttng::format( |
| 1101 | "Failed to open MI command element: command_name=`{}`", |
| 1102 | mi_lttng_element_command_enable_event)); |
| 1103 | } |
| 1104 | |
| 1105 | /* Open output element */ |
| 1106 | ret = mi_lttng_writer_open_element(writer.get(), mi_lttng_element_command_output); |
| 1107 | if (ret) { |
| 1108 | LTTNG_THROW_ERROR( |
| 1109 | lttng::format("Failed to open MI element: element_name=`{}`", |
| 1110 | mi_lttng_element_command_output)); |
| 1111 | } |
| 1112 | } |
| 1113 | |
| 1114 | /* Close the MI command context when leaving the function, no matter the result. */ |
| 1115 | const auto close_mi_on_exit = lttng::make_scope_exit([&success]() noexcept { |
| 1116 | if (!lttng_opt_mi) { |
| 1117 | return; |
| 1118 | } |
| 1119 | |
| 1120 | /* Close output element. */ |
| 1121 | if (mi_lttng_writer_close_element(writer.get())) { |
| 1122 | ERR_FMT("Failed to close MI output element"); |
| 1123 | return; |
| 1124 | } |
| 1125 | |
| 1126 | if (mi_lttng_writer_write_element_bool( |
| 1127 | writer.get(), mi_lttng_element_command_success, success)) { |
| 1128 | ERR_FMT("Failed to write MI element: element_name=`{}`, value={}", |
| 1129 | mi_lttng_element_command_success, |
| 1130 | success); |
| 1131 | return; |
| 1132 | } |
| 1133 | |
| 1134 | /* Command element close. */ |
| 1135 | if (mi_lttng_writer_command_close(writer.get())) { |
| 1136 | ERR_FMT("Failed to close MI command element"); |
| 1137 | return; |
| 1138 | } |
| 1139 | }); |
| 1140 | |
| 1141 | arg_event_list = poptGetArg(pc.get()); |
| 1142 | if (arg_event_list == nullptr && opt_enable_all == 0) { |
| 1143 | ERR("Missing event name pattern(s)"); |
| 1144 | return CMD_ERROR; |
| 1145 | } |
| 1146 | |
| 1147 | if (opt_enable_all) { |
| 1148 | patterns.emplace_back("*"); |
| 1149 | } else { |
| 1150 | std::stringstream event_list_arg_stream(arg_event_list); |
| 1151 | |
| 1152 | for (std::string line; std::getline(event_list_arg_stream, line, ',');) { |
| 1153 | patterns.emplace_back(std::move(line)); |
| 1154 | } |
| 1155 | } |
| 1156 | |
| 1157 | leftover = poptGetArg(pc.get()); |
| 1158 | if (leftover) { |
| 1159 | ERR("Unknown argument: %s", leftover); |
| 1160 | return CMD_ERROR; |
| 1161 | } |
| 1162 | |
| 1163 | if (!opt_session_name) { |
| 1164 | const auto rc_file_session_name = |
| 1165 | lttng::make_unique_wrapper<char, lttng::free>(get_session_name()); |
| 1166 | |
| 1167 | if (!rc_file_session_name) { |
| 1168 | return CMD_ERROR; |
| 1169 | } |
| 1170 | |
| 1171 | session_name = rc_file_session_name.get(); |
| 1172 | } else { |
| 1173 | session_name = opt_session_name; |
| 1174 | } |
| 1175 | |
| 1176 | command_ret = enable_events(session_name, patterns); |
| 1177 | if (command_ret) { |
| 1178 | return CMD_ERROR; |
| 1179 | } |
| 1180 | |
| 1181 | return CMD_SUCCESS; |
| 1182 | } |