| 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 <popt.h> |
| 20 | #include <stdio.h> |
| 21 | #include <stdlib.h> |
| 22 | #include <string.h> |
| 23 | #include <sys/stat.h> |
| 24 | #include <sys/types.h> |
| 25 | #include <unistd.h> |
| 26 | #include <inttypes.h> |
| 27 | #include <assert.h> |
| 28 | #include <ctype.h> |
| 29 | |
| 30 | #include <common/sessiond-comm/sessiond-comm.h> |
| 31 | #include <common/utils.h> |
| 32 | #include <common/mi-lttng.h> |
| 33 | |
| 34 | #include "../command.h" |
| 35 | #include "../utils.h" |
| 36 | |
| 37 | |
| 38 | static char *opt_channels; |
| 39 | static int opt_kernel; |
| 40 | static char *opt_session_name; |
| 41 | static int opt_userspace; |
| 42 | static struct lttng_channel chan; |
| 43 | static char *opt_output; |
| 44 | static int opt_buffer_uid; |
| 45 | static int opt_buffer_pid; |
| 46 | static int opt_buffer_global; |
| 47 | |
| 48 | static struct mi_writer *writer; |
| 49 | |
| 50 | enum { |
| 51 | OPT_HELP = 1, |
| 52 | OPT_DISCARD, |
| 53 | OPT_OVERWRITE, |
| 54 | OPT_SUBBUF_SIZE, |
| 55 | OPT_NUM_SUBBUF, |
| 56 | OPT_SWITCH_TIMER, |
| 57 | OPT_READ_TIMER, |
| 58 | OPT_USERSPACE, |
| 59 | OPT_LIST_OPTIONS, |
| 60 | OPT_TRACEFILE_SIZE, |
| 61 | OPT_TRACEFILE_COUNT, |
| 62 | }; |
| 63 | |
| 64 | static struct lttng_handle *handle; |
| 65 | |
| 66 | const char *output_mmap = "mmap"; |
| 67 | const char *output_splice = "splice"; |
| 68 | |
| 69 | static struct poptOption long_options[] = { |
| 70 | /* longName, shortName, argInfo, argPtr, value, descrip, argDesc */ |
| 71 | {"help", 'h', POPT_ARG_NONE, 0, OPT_HELP, 0, 0}, |
| 72 | {"session", 's', POPT_ARG_STRING, &opt_session_name, 0, 0, 0}, |
| 73 | {"kernel", 'k', POPT_ARG_VAL, &opt_kernel, 1, 0, 0}, |
| 74 | {"userspace", 'u', POPT_ARG_NONE, 0, OPT_USERSPACE, 0, 0}, |
| 75 | {"discard", 0, POPT_ARG_NONE, 0, OPT_DISCARD, 0, 0}, |
| 76 | {"overwrite", 0, POPT_ARG_NONE, 0, OPT_OVERWRITE, 0, 0}, |
| 77 | {"subbuf-size", 0, POPT_ARG_STRING, 0, OPT_SUBBUF_SIZE, 0, 0}, |
| 78 | {"num-subbuf", 0, POPT_ARG_INT, 0, OPT_NUM_SUBBUF, 0, 0}, |
| 79 | {"switch-timer", 0, POPT_ARG_INT, 0, OPT_SWITCH_TIMER, 0, 0}, |
| 80 | {"read-timer", 0, POPT_ARG_INT, 0, OPT_READ_TIMER, 0, 0}, |
| 81 | {"list-options", 0, POPT_ARG_NONE, NULL, OPT_LIST_OPTIONS, NULL, NULL}, |
| 82 | {"output", 0, POPT_ARG_STRING, &opt_output, 0, 0, 0}, |
| 83 | {"buffers-uid", 0, POPT_ARG_VAL, &opt_buffer_uid, 1, 0, 0}, |
| 84 | {"buffers-pid", 0, POPT_ARG_VAL, &opt_buffer_pid, 1, 0, 0}, |
| 85 | {"buffers-global", 0, POPT_ARG_VAL, &opt_buffer_global, 1, 0, 0}, |
| 86 | {"tracefile-size", 'C', POPT_ARG_INT, 0, OPT_TRACEFILE_SIZE, 0, 0}, |
| 87 | {"tracefile-count", 'W', POPT_ARG_INT, 0, OPT_TRACEFILE_COUNT, 0, 0}, |
| 88 | {0, 0, 0, 0, 0, 0, 0} |
| 89 | }; |
| 90 | |
| 91 | /* |
| 92 | * Set default attributes depending on those already defined from the command |
| 93 | * line. |
| 94 | */ |
| 95 | static void set_default_attr(struct lttng_domain *dom) |
| 96 | { |
| 97 | struct lttng_channel_attr default_attr; |
| 98 | |
| 99 | /* Set attributes */ |
| 100 | lttng_channel_set_default_attr(dom, &default_attr); |
| 101 | |
| 102 | if (chan.attr.overwrite == -1) { |
| 103 | chan.attr.overwrite = default_attr.overwrite; |
| 104 | } |
| 105 | if (chan.attr.subbuf_size == -1) { |
| 106 | chan.attr.subbuf_size = default_attr.subbuf_size; |
| 107 | } |
| 108 | if (chan.attr.num_subbuf == -1) { |
| 109 | chan.attr.num_subbuf = default_attr.num_subbuf; |
| 110 | } |
| 111 | if (chan.attr.switch_timer_interval == -1) { |
| 112 | chan.attr.switch_timer_interval = default_attr.switch_timer_interval; |
| 113 | } |
| 114 | if (chan.attr.read_timer_interval == -1) { |
| 115 | chan.attr.read_timer_interval = default_attr.read_timer_interval; |
| 116 | } |
| 117 | if ((int) chan.attr.output == -1) { |
| 118 | chan.attr.output = default_attr.output; |
| 119 | } |
| 120 | if (chan.attr.tracefile_count == -1) { |
| 121 | chan.attr.tracefile_count = default_attr.tracefile_count; |
| 122 | } |
| 123 | if (chan.attr.tracefile_size == -1) { |
| 124 | chan.attr.tracefile_size = default_attr.tracefile_size; |
| 125 | } |
| 126 | } |
| 127 | |
| 128 | /* |
| 129 | * Adding channel using the lttng API. |
| 130 | */ |
| 131 | static int enable_channel(char *session_name) |
| 132 | { |
| 133 | int ret = CMD_SUCCESS, warn = 0, error = 0, success = 0; |
| 134 | char *channel_name; |
| 135 | struct lttng_domain dom; |
| 136 | |
| 137 | memset(&dom, 0, sizeof(dom)); |
| 138 | |
| 139 | /* Create lttng domain */ |
| 140 | if (opt_kernel) { |
| 141 | dom.type = LTTNG_DOMAIN_KERNEL; |
| 142 | dom.buf_type = LTTNG_BUFFER_GLOBAL; |
| 143 | if (opt_buffer_uid || opt_buffer_pid) { |
| 144 | ERR("Buffer type not supported for domain -k"); |
| 145 | ret = CMD_ERROR; |
| 146 | goto error; |
| 147 | } |
| 148 | } else if (opt_userspace) { |
| 149 | dom.type = LTTNG_DOMAIN_UST; |
| 150 | if (opt_buffer_pid) { |
| 151 | dom.buf_type = LTTNG_BUFFER_PER_PID; |
| 152 | } else { |
| 153 | if (opt_buffer_global) { |
| 154 | ERR("Buffer type not supported for domain -u"); |
| 155 | ret = CMD_ERROR; |
| 156 | goto error; |
| 157 | } |
| 158 | dom.buf_type = LTTNG_BUFFER_PER_UID; |
| 159 | } |
| 160 | } else { |
| 161 | /* Checked by the caller. */ |
| 162 | assert(0); |
| 163 | } |
| 164 | |
| 165 | set_default_attr(&dom); |
| 166 | |
| 167 | if (chan.attr.tracefile_size == 0 && chan.attr.tracefile_count) { |
| 168 | ERR("Missing option --tracefile-size. " |
| 169 | "A file count without a size won't do anything."); |
| 170 | ret = CMD_ERROR; |
| 171 | goto error; |
| 172 | } |
| 173 | |
| 174 | if ((chan.attr.tracefile_size > 0) && |
| 175 | (chan.attr.tracefile_size < chan.attr.subbuf_size)) { |
| 176 | WARN("Tracefile size rounded up from (%" PRIu64 ") to subbuffer size (%" PRIu64 ")", |
| 177 | chan.attr.tracefile_size, chan.attr.subbuf_size); |
| 178 | chan.attr.tracefile_size = chan.attr.subbuf_size; |
| 179 | } |
| 180 | |
| 181 | /* Setting channel output */ |
| 182 | if (opt_output) { |
| 183 | if (!strncmp(output_mmap, opt_output, strlen(output_mmap))) { |
| 184 | chan.attr.output = LTTNG_EVENT_MMAP; |
| 185 | } else if (!strncmp(output_splice, opt_output, strlen(output_splice))) { |
| 186 | chan.attr.output = LTTNG_EVENT_SPLICE; |
| 187 | } else { |
| 188 | ERR("Unknown output type %s. Possible values are: %s, %s\n", |
| 189 | opt_output, output_mmap, output_splice); |
| 190 | ret = CMD_ERROR; |
| 191 | goto error; |
| 192 | } |
| 193 | } |
| 194 | |
| 195 | handle = lttng_create_handle(session_name, &dom); |
| 196 | if (handle == NULL) { |
| 197 | ret = -1; |
| 198 | goto error; |
| 199 | } |
| 200 | |
| 201 | /* Mi open channels element */ |
| 202 | if (lttng_opt_mi) { |
| 203 | assert(writer); |
| 204 | ret = mi_lttng_channels_open(writer); |
| 205 | if (ret) { |
| 206 | ret = CMD_ERROR; |
| 207 | goto error; |
| 208 | } |
| 209 | } |
| 210 | |
| 211 | /* Strip channel list (format: chan1,chan2,...) */ |
| 212 | channel_name = strtok(opt_channels, ","); |
| 213 | while (channel_name != NULL) { |
| 214 | /* Validate channel name's length */ |
| 215 | if (strlen(channel_name) >= NAME_MAX) { |
| 216 | ERR("Channel name is too long (max. %zu characters)", |
| 217 | sizeof(chan.name) - 1); |
| 218 | error = 1; |
| 219 | goto skip_enable; |
| 220 | } |
| 221 | |
| 222 | /* Copy channel name */ |
| 223 | strcpy(chan.name, channel_name); |
| 224 | |
| 225 | DBG("Enabling channel %s", channel_name); |
| 226 | |
| 227 | ret = lttng_enable_channel(handle, &chan); |
| 228 | if (ret < 0) { |
| 229 | success = 0; |
| 230 | switch (-ret) { |
| 231 | case LTTNG_ERR_KERN_CHAN_EXIST: |
| 232 | case LTTNG_ERR_UST_CHAN_EXIST: |
| 233 | case LTTNG_ERR_CHAN_EXIST: |
| 234 | WARN("Channel %s: %s (session %s)", channel_name, |
| 235 | lttng_strerror(ret), session_name); |
| 236 | warn = 1; |
| 237 | break; |
| 238 | case LTTNG_ERR_INVALID_CHANNEL_NAME: |
| 239 | ERR("Invalid channel name: \"%s\". " |
| 240 | "Channel names may not start with '.', and " |
| 241 | "may not contain '/'.", channel_name); |
| 242 | error = 1; |
| 243 | break; |
| 244 | default: |
| 245 | ERR("Channel %s: %s (session %s)", channel_name, |
| 246 | lttng_strerror(ret), session_name); |
| 247 | error = 1; |
| 248 | break; |
| 249 | } |
| 250 | } else { |
| 251 | MSG("%s channel %s enabled for session %s", |
| 252 | get_domain_str(dom.type), channel_name, session_name); |
| 253 | success = 1; |
| 254 | } |
| 255 | |
| 256 | skip_enable: |
| 257 | if (lttng_opt_mi) { |
| 258 | /* Mi print the channel element and leave it open */ |
| 259 | ret = mi_lttng_channel(writer, &chan, 1); |
| 260 | if (ret) { |
| 261 | ret = CMD_ERROR; |
| 262 | goto error; |
| 263 | } |
| 264 | |
| 265 | /* Individual Success ? */ |
| 266 | ret = mi_lttng_writer_write_element_bool(writer, |
| 267 | mi_lttng_element_command_success, success); |
| 268 | if (ret) { |
| 269 | ret = CMD_ERROR; |
| 270 | goto error; |
| 271 | } |
| 272 | |
| 273 | /* Close channel element */ |
| 274 | ret = mi_lttng_writer_close_element(writer); |
| 275 | if (ret) { |
| 276 | ret = CMD_ERROR; |
| 277 | goto error; |
| 278 | } |
| 279 | } |
| 280 | |
| 281 | /* Next channel */ |
| 282 | channel_name = strtok(NULL, ","); |
| 283 | } |
| 284 | |
| 285 | if (lttng_opt_mi) { |
| 286 | /* Close channels element */ |
| 287 | ret = mi_lttng_writer_close_element(writer); |
| 288 | if (ret) { |
| 289 | ret = CMD_ERROR; |
| 290 | goto error; |
| 291 | } |
| 292 | } |
| 293 | |
| 294 | ret = CMD_SUCCESS; |
| 295 | |
| 296 | error: |
| 297 | /* If more important error happen bypass the warning */ |
| 298 | if (!ret && warn) { |
| 299 | ret = CMD_WARNING; |
| 300 | } |
| 301 | /* If more important error happen bypass the warning */ |
| 302 | if (!ret && error) { |
| 303 | ret = CMD_ERROR; |
| 304 | } |
| 305 | |
| 306 | lttng_destroy_handle(handle); |
| 307 | |
| 308 | return ret; |
| 309 | } |
| 310 | |
| 311 | /* |
| 312 | * Default value for channel configuration. |
| 313 | */ |
| 314 | static void init_channel_config(void) |
| 315 | { |
| 316 | /* |
| 317 | * Put -1 everywhere so we can identify those set by the command line and |
| 318 | * those needed to be set by the default values. |
| 319 | */ |
| 320 | memset(&chan.attr, -1, sizeof(chan.attr)); |
| 321 | chan.attr.extended.ptr = NULL; |
| 322 | } |
| 323 | |
| 324 | /* |
| 325 | * Add channel to trace session |
| 326 | */ |
| 327 | int cmd_enable_channels(int argc, const char **argv) |
| 328 | { |
| 329 | int opt, ret = CMD_SUCCESS, command_ret = CMD_SUCCESS, success = 1; |
| 330 | static poptContext pc; |
| 331 | char *session_name = NULL; |
| 332 | char *opt_arg = NULL; |
| 333 | |
| 334 | init_channel_config(); |
| 335 | |
| 336 | pc = poptGetContext(NULL, argc, argv, long_options, 0); |
| 337 | poptReadDefaultConfig(pc, 0); |
| 338 | |
| 339 | while ((opt = poptGetNextOpt(pc)) != -1) { |
| 340 | switch (opt) { |
| 341 | case OPT_HELP: |
| 342 | SHOW_HELP(); |
| 343 | goto end; |
| 344 | case OPT_DISCARD: |
| 345 | chan.attr.overwrite = 0; |
| 346 | DBG("Channel set to discard"); |
| 347 | break; |
| 348 | case OPT_OVERWRITE: |
| 349 | chan.attr.overwrite = 1; |
| 350 | DBG("Channel set to overwrite"); |
| 351 | break; |
| 352 | case OPT_SUBBUF_SIZE: |
| 353 | { |
| 354 | uint64_t rounded_size; |
| 355 | int order; |
| 356 | |
| 357 | /* Parse the size */ |
| 358 | opt_arg = poptGetOptArg(pc); |
| 359 | if (utils_parse_size_suffix(opt_arg, &chan.attr.subbuf_size) < 0 || !chan.attr.subbuf_size) { |
| 360 | ERR("Wrong value in --subbuf-size parameter: %s", opt_arg); |
| 361 | ret = CMD_ERROR; |
| 362 | goto end; |
| 363 | } |
| 364 | |
| 365 | order = get_count_order_u64(chan.attr.subbuf_size); |
| 366 | assert(order >= 0); |
| 367 | rounded_size = 1ULL << order; |
| 368 | if (rounded_size < chan.attr.subbuf_size) { |
| 369 | ERR("The subbuf size (%" PRIu64 ") is rounded and overflows!", |
| 370 | chan.attr.subbuf_size); |
| 371 | ret = CMD_ERROR; |
| 372 | goto end; |
| 373 | } |
| 374 | |
| 375 | if (rounded_size != chan.attr.subbuf_size) { |
| 376 | WARN("The subbuf size (%" PRIu64 ") is rounded to the next power of 2 (%" PRIu64 ")", |
| 377 | chan.attr.subbuf_size, rounded_size); |
| 378 | chan.attr.subbuf_size = rounded_size; |
| 379 | } |
| 380 | |
| 381 | /* Should now be power of 2 */ |
| 382 | assert(!((chan.attr.subbuf_size - 1) & chan.attr.subbuf_size)); |
| 383 | |
| 384 | DBG("Channel subbuf size set to %" PRIu64, chan.attr.subbuf_size); |
| 385 | break; |
| 386 | } |
| 387 | case OPT_NUM_SUBBUF: |
| 388 | { |
| 389 | uint64_t rounded_size; |
| 390 | int order; |
| 391 | |
| 392 | errno = 0; |
| 393 | opt_arg = poptGetOptArg(pc); |
| 394 | chan.attr.num_subbuf = strtoull(opt_arg, NULL, 0); |
| 395 | if (errno != 0 || !chan.attr.num_subbuf || !isdigit(opt_arg[0])) { |
| 396 | ERR("Wrong value in --num-subbuf parameter: %s", opt_arg); |
| 397 | ret = CMD_ERROR; |
| 398 | goto end; |
| 399 | } |
| 400 | |
| 401 | order = get_count_order_u64(chan.attr.num_subbuf); |
| 402 | assert(order >= 0); |
| 403 | rounded_size = 1ULL << order; |
| 404 | if (rounded_size < chan.attr.num_subbuf) { |
| 405 | ERR("The number of subbuffers (%" PRIu64 ") is rounded and overflows!", |
| 406 | chan.attr.num_subbuf); |
| 407 | ret = CMD_ERROR; |
| 408 | goto end; |
| 409 | } |
| 410 | |
| 411 | if (rounded_size != chan.attr.num_subbuf) { |
| 412 | WARN("The number of subbuffers (%" PRIu64 ") is rounded to the next power of 2 (%" PRIu64 ")", |
| 413 | chan.attr.num_subbuf, rounded_size); |
| 414 | chan.attr.num_subbuf = rounded_size; |
| 415 | } |
| 416 | |
| 417 | /* Should now be power of 2 */ |
| 418 | assert(!((chan.attr.num_subbuf - 1) & chan.attr.num_subbuf)); |
| 419 | |
| 420 | DBG("Channel subbuf num set to %" PRIu64, chan.attr.num_subbuf); |
| 421 | break; |
| 422 | } |
| 423 | case OPT_SWITCH_TIMER: |
| 424 | { |
| 425 | unsigned long v; |
| 426 | |
| 427 | errno = 0; |
| 428 | opt_arg = poptGetOptArg(pc); |
| 429 | v = strtoul(opt_arg, NULL, 0); |
| 430 | if (errno != 0 || !isdigit(opt_arg[0])) { |
| 431 | ERR("Wrong value in --switch-timer parameter: %s", opt_arg); |
| 432 | ret = CMD_ERROR; |
| 433 | goto end; |
| 434 | } |
| 435 | if (v != (uint32_t) v) { |
| 436 | ERR("32-bit overflow in --switch-timer parameter: %s", opt_arg); |
| 437 | ret = CMD_ERROR; |
| 438 | goto end; |
| 439 | } |
| 440 | chan.attr.switch_timer_interval = (uint32_t) v; |
| 441 | DBG("Channel switch timer interval set to %d", chan.attr.switch_timer_interval); |
| 442 | break; |
| 443 | } |
| 444 | case OPT_READ_TIMER: |
| 445 | { |
| 446 | unsigned long v; |
| 447 | |
| 448 | errno = 0; |
| 449 | opt_arg = poptGetOptArg(pc); |
| 450 | v = strtoul(opt_arg, NULL, 0); |
| 451 | if (errno != 0 || !isdigit(opt_arg[0])) { |
| 452 | ERR("Wrong value in --read-timer parameter: %s", opt_arg); |
| 453 | ret = CMD_ERROR; |
| 454 | goto end; |
| 455 | } |
| 456 | if (v != (uint32_t) v) { |
| 457 | ERR("32-bit overflow in --read-timer parameter: %s", opt_arg); |
| 458 | ret = CMD_ERROR; |
| 459 | goto end; |
| 460 | } |
| 461 | chan.attr.read_timer_interval = (uint32_t) v; |
| 462 | DBG("Channel read timer interval set to %d", chan.attr.read_timer_interval); |
| 463 | break; |
| 464 | } |
| 465 | case OPT_USERSPACE: |
| 466 | opt_userspace = 1; |
| 467 | break; |
| 468 | case OPT_TRACEFILE_SIZE: |
| 469 | opt_arg = poptGetOptArg(pc); |
| 470 | if (utils_parse_size_suffix(opt_arg, &chan.attr.tracefile_size) < 0) { |
| 471 | ERR("Wrong value in --tracefile-size parameter: %s", opt_arg); |
| 472 | ret = CMD_ERROR; |
| 473 | goto end; |
| 474 | } |
| 475 | DBG("Maximum tracefile size set to %" PRIu64, |
| 476 | chan.attr.tracefile_size); |
| 477 | break; |
| 478 | case OPT_TRACEFILE_COUNT: |
| 479 | { |
| 480 | unsigned long v; |
| 481 | |
| 482 | errno = 0; |
| 483 | opt_arg = poptGetOptArg(pc); |
| 484 | v = strtoul(opt_arg, NULL, 0); |
| 485 | if (errno != 0 || !isdigit(opt_arg[0])) { |
| 486 | ERR("Wrong value in --tracefile-count parameter: %s", opt_arg); |
| 487 | ret = CMD_ERROR; |
| 488 | goto end; |
| 489 | } |
| 490 | if (v != (uint32_t) v) { |
| 491 | ERR("32-bit overflow in --tracefile-count parameter: %s", opt_arg); |
| 492 | ret = CMD_ERROR; |
| 493 | goto end; |
| 494 | } |
| 495 | chan.attr.tracefile_count = (uint32_t) v; |
| 496 | DBG("Maximum tracefile count set to %" PRIu64, |
| 497 | chan.attr.tracefile_count); |
| 498 | break; |
| 499 | } |
| 500 | case OPT_LIST_OPTIONS: |
| 501 | list_cmd_options(stdout, long_options); |
| 502 | goto end; |
| 503 | default: |
| 504 | ret = CMD_UNDEFINED; |
| 505 | goto end; |
| 506 | } |
| 507 | } |
| 508 | |
| 509 | ret = print_missing_or_multiple_domains(opt_kernel + opt_userspace); |
| 510 | if (ret) { |
| 511 | ret = CMD_ERROR; |
| 512 | goto end; |
| 513 | } |
| 514 | |
| 515 | /* Mi check */ |
| 516 | if (lttng_opt_mi) { |
| 517 | writer = mi_lttng_writer_create(fileno(stdout), lttng_opt_mi); |
| 518 | if (!writer) { |
| 519 | ret = -LTTNG_ERR_NOMEM; |
| 520 | goto end; |
| 521 | } |
| 522 | |
| 523 | /* Open command element */ |
| 524 | ret = mi_lttng_writer_command_open(writer, |
| 525 | mi_lttng_element_command_enable_channels); |
| 526 | if (ret) { |
| 527 | ret = CMD_ERROR; |
| 528 | goto end; |
| 529 | } |
| 530 | |
| 531 | /* Open output element */ |
| 532 | ret = mi_lttng_writer_open_element(writer, |
| 533 | mi_lttng_element_command_output); |
| 534 | if (ret) { |
| 535 | ret = CMD_ERROR; |
| 536 | goto end; |
| 537 | } |
| 538 | } |
| 539 | |
| 540 | opt_channels = (char*) poptGetArg(pc); |
| 541 | if (opt_channels == NULL) { |
| 542 | ERR("Missing channel name.\n"); |
| 543 | ret = CMD_ERROR; |
| 544 | success = 0; |
| 545 | goto mi_closing; |
| 546 | } |
| 547 | |
| 548 | if (!opt_session_name) { |
| 549 | session_name = get_session_name(); |
| 550 | if (session_name == NULL) { |
| 551 | command_ret = CMD_ERROR; |
| 552 | success = 0; |
| 553 | goto mi_closing; |
| 554 | } |
| 555 | } else { |
| 556 | session_name = opt_session_name; |
| 557 | } |
| 558 | |
| 559 | command_ret = enable_channel(session_name); |
| 560 | if (command_ret) { |
| 561 | success = 0; |
| 562 | } |
| 563 | |
| 564 | mi_closing: |
| 565 | /* Mi closing */ |
| 566 | if (lttng_opt_mi) { |
| 567 | /* Close output element */ |
| 568 | ret = mi_lttng_writer_close_element(writer); |
| 569 | if (ret) { |
| 570 | goto end; |
| 571 | } |
| 572 | |
| 573 | /* Success ? */ |
| 574 | ret = mi_lttng_writer_write_element_bool(writer, |
| 575 | mi_lttng_element_command_success, success); |
| 576 | if (ret) { |
| 577 | goto end; |
| 578 | } |
| 579 | |
| 580 | /* Command element close */ |
| 581 | ret = mi_lttng_writer_command_close(writer); |
| 582 | if (ret) { |
| 583 | goto end; |
| 584 | } |
| 585 | } |
| 586 | |
| 587 | end: |
| 588 | /* Mi clean-up */ |
| 589 | if (writer && mi_lttng_writer_destroy(writer)) { |
| 590 | /* Preserve original error code */ |
| 591 | ret = ret ? ret : LTTNG_ERR_MI_IO_FAIL; |
| 592 | } |
| 593 | |
| 594 | if (!opt_session_name && session_name) { |
| 595 | free(session_name); |
| 596 | } |
| 597 | |
| 598 | /* Overwrite ret if an error occurred when enable_channel */ |
| 599 | ret = command_ret ? command_ret : ret; |
| 600 | poptFreeContext(pc); |
| 601 | return ret; |
| 602 | } |