| 1 | /* |
| 2 | * Copyright (C) 2013 - David Goulet <dgoulet@efficios.com> |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or modify it |
| 5 | * under the terms of the GNU General Public License, version 2 only, as |
| 6 | * published by the Free Software Foundation. |
| 7 | * |
| 8 | * This program is distributed in the hope that it will be useful, but WITHOUT |
| 9 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 10 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for |
| 11 | * more details. |
| 12 | * |
| 13 | * You should have received a copy of the GNU General Public License along with |
| 14 | * this program; if not, write to the Free Software Foundation, Inc., 51 |
| 15 | * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. |
| 16 | */ |
| 17 | |
| 18 | #define _LGPL_SOURCE |
| 19 | #include <assert.h> |
| 20 | #include <inttypes.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 <unistd.h> |
| 28 | #include <assert.h> |
| 29 | |
| 30 | #include <common/utils.h> |
| 31 | #include <common/mi-lttng.h> |
| 32 | #include <lttng/snapshot.h> |
| 33 | |
| 34 | #include "../command.h" |
| 35 | |
| 36 | static const char *opt_session_name; |
| 37 | static const char *opt_output_name; |
| 38 | static const char *opt_data_url; |
| 39 | static const char *opt_ctrl_url; |
| 40 | static const char *current_session_name; |
| 41 | static uint64_t opt_max_size; |
| 42 | |
| 43 | /* Stub for the cmd struct actions. */ |
| 44 | static int cmd_add_output(int argc, const char **argv); |
| 45 | static int cmd_del_output(int argc, const char **argv); |
| 46 | static int cmd_list_output(int argc, const char **argv); |
| 47 | static int cmd_record(int argc, const char **argv); |
| 48 | |
| 49 | static const char *indent4 = " "; |
| 50 | |
| 51 | enum { |
| 52 | OPT_HELP = 1, |
| 53 | OPT_LIST_OPTIONS, |
| 54 | OPT_MAX_SIZE, |
| 55 | OPT_LIST_COMMANDS, |
| 56 | }; |
| 57 | |
| 58 | static struct mi_writer *writer; |
| 59 | |
| 60 | static struct poptOption snapshot_opts[] = { |
| 61 | /* longName, shortName, argInfo, argPtr, value, descrip, argDesc */ |
| 62 | {"help", 'h', POPT_ARG_NONE, 0, OPT_HELP, 0, 0}, |
| 63 | {"session", 's', POPT_ARG_STRING, &opt_session_name, 0, 0, 0}, |
| 64 | {"ctrl-url", 'C', POPT_ARG_STRING, &opt_ctrl_url, 0, 0, 0}, |
| 65 | {"data-url", 'D', POPT_ARG_STRING, &opt_data_url, 0, 0, 0}, |
| 66 | {"name", 'n', POPT_ARG_STRING, &opt_output_name, 0, 0, 0}, |
| 67 | {"max-size", 'm', POPT_ARG_STRING, 0, OPT_MAX_SIZE, 0, 0}, |
| 68 | {"list-options", 0, POPT_ARG_NONE, NULL, OPT_LIST_OPTIONS, NULL, NULL}, |
| 69 | {"list-commands", 0, POPT_ARG_NONE, NULL, OPT_LIST_COMMANDS}, |
| 70 | {0, 0, 0, 0, 0, 0, 0} |
| 71 | }; |
| 72 | |
| 73 | static struct cmd_struct actions[] = { |
| 74 | { "add-output", cmd_add_output }, |
| 75 | { "del-output", cmd_del_output }, |
| 76 | { "list-output", cmd_list_output }, |
| 77 | { "record", cmd_record }, |
| 78 | { NULL, NULL } /* Array closure */ |
| 79 | }; |
| 80 | |
| 81 | /* |
| 82 | * Count and return the number of arguments in argv. |
| 83 | */ |
| 84 | static int count_arguments(const char **argv) |
| 85 | { |
| 86 | int i = 0; |
| 87 | |
| 88 | assert(argv); |
| 89 | |
| 90 | while (argv[i] != NULL) { |
| 91 | i++; |
| 92 | } |
| 93 | |
| 94 | return i; |
| 95 | } |
| 96 | |
| 97 | /* |
| 98 | * Create a snapshot output object from arguments using the given URL. |
| 99 | * |
| 100 | * Return a newly allocated object or NULL on error. |
| 101 | */ |
| 102 | static struct lttng_snapshot_output *create_output_from_args(const char *url) |
| 103 | { |
| 104 | int ret = 0; |
| 105 | struct lttng_snapshot_output *output = NULL; |
| 106 | |
| 107 | output = lttng_snapshot_output_create(); |
| 108 | if (!output) { |
| 109 | goto error_create; |
| 110 | } |
| 111 | |
| 112 | if (url) { |
| 113 | ret = lttng_snapshot_output_set_ctrl_url(url, output); |
| 114 | if (ret < 0) { |
| 115 | goto error; |
| 116 | } |
| 117 | } else if (opt_ctrl_url) { |
| 118 | ret = lttng_snapshot_output_set_ctrl_url(opt_ctrl_url, output); |
| 119 | if (ret < 0) { |
| 120 | goto error; |
| 121 | } |
| 122 | } |
| 123 | |
| 124 | if (opt_data_url) { |
| 125 | ret = lttng_snapshot_output_set_data_url(opt_data_url, output); |
| 126 | if (ret < 0) { |
| 127 | goto error; |
| 128 | } |
| 129 | } |
| 130 | |
| 131 | if (opt_max_size) { |
| 132 | ret = lttng_snapshot_output_set_size(opt_max_size, output); |
| 133 | if (ret < 0) { |
| 134 | goto error; |
| 135 | } |
| 136 | } |
| 137 | |
| 138 | if (opt_output_name) { |
| 139 | ret = lttng_snapshot_output_set_name(opt_output_name, output); |
| 140 | if (ret < 0) { |
| 141 | goto error; |
| 142 | } |
| 143 | } |
| 144 | |
| 145 | return output; |
| 146 | |
| 147 | error: |
| 148 | lttng_snapshot_output_destroy(output); |
| 149 | error_create: |
| 150 | return NULL; |
| 151 | } |
| 152 | |
| 153 | static int mi_list_output(void) |
| 154 | { |
| 155 | int ret; |
| 156 | struct lttng_snapshot_output *s_iter; |
| 157 | struct lttng_snapshot_output_list *list; |
| 158 | |
| 159 | assert(writer); |
| 160 | |
| 161 | ret = lttng_snapshot_list_output(current_session_name, &list); |
| 162 | if (ret < 0) { |
| 163 | goto error; |
| 164 | } |
| 165 | |
| 166 | ret = mi_lttng_snapshot_output_session_name(writer, current_session_name); |
| 167 | if (ret) { |
| 168 | ret = CMD_ERROR; |
| 169 | goto end; |
| 170 | } |
| 171 | |
| 172 | while ((s_iter = lttng_snapshot_output_list_get_next(list)) != NULL) { |
| 173 | ret = mi_lttng_snapshot_list_output(writer, s_iter); |
| 174 | if (ret) { |
| 175 | ret = CMD_ERROR; |
| 176 | goto end; |
| 177 | } |
| 178 | } |
| 179 | |
| 180 | |
| 181 | /* Close snapshot snapshots element */ |
| 182 | ret = mi_lttng_writer_close_element(writer); |
| 183 | if (ret) { |
| 184 | ret = CMD_ERROR; |
| 185 | goto end; |
| 186 | } |
| 187 | |
| 188 | /* Close snapshot session element */ |
| 189 | ret = mi_lttng_writer_close_element(writer); |
| 190 | if (ret) { |
| 191 | ret = CMD_ERROR; |
| 192 | } |
| 193 | end: |
| 194 | lttng_snapshot_output_list_destroy(list); |
| 195 | error: |
| 196 | return ret; |
| 197 | } |
| 198 | |
| 199 | static int list_output(void) |
| 200 | { |
| 201 | int ret, output_seen = 0; |
| 202 | struct lttng_snapshot_output *s_iter; |
| 203 | struct lttng_snapshot_output_list *list; |
| 204 | |
| 205 | ret = lttng_snapshot_list_output(current_session_name, &list); |
| 206 | if (ret < 0) { |
| 207 | goto error; |
| 208 | } |
| 209 | |
| 210 | MSG("Snapshot output list for session %s", current_session_name); |
| 211 | |
| 212 | while ((s_iter = lttng_snapshot_output_list_get_next(list)) != NULL) { |
| 213 | MSG("%s[%" PRIu32 "] %s: %s (max-size: %" PRId64 ")", indent4, |
| 214 | lttng_snapshot_output_get_id(s_iter), |
| 215 | lttng_snapshot_output_get_name(s_iter), |
| 216 | lttng_snapshot_output_get_ctrl_url(s_iter), |
| 217 | lttng_snapshot_output_get_maxsize(s_iter)); |
| 218 | output_seen = 1; |
| 219 | } |
| 220 | |
| 221 | lttng_snapshot_output_list_destroy(list); |
| 222 | |
| 223 | if (!output_seen) { |
| 224 | MSG("%sNone", indent4); |
| 225 | } |
| 226 | |
| 227 | error: |
| 228 | return ret; |
| 229 | } |
| 230 | |
| 231 | /* |
| 232 | * Delete output by ID (machine interface version). |
| 233 | */ |
| 234 | static int mi_del_output(uint32_t id, const char *name) |
| 235 | { |
| 236 | int ret; |
| 237 | struct lttng_snapshot_output *output = NULL; |
| 238 | |
| 239 | assert(writer); |
| 240 | |
| 241 | output = lttng_snapshot_output_create(); |
| 242 | if (!output) { |
| 243 | ret = CMD_FATAL; |
| 244 | goto error; |
| 245 | } |
| 246 | |
| 247 | if (name) { |
| 248 | ret = lttng_snapshot_output_set_name(name, output); |
| 249 | } else if (id != UINT32_MAX) { |
| 250 | ret = lttng_snapshot_output_set_id(id, output); |
| 251 | } else { |
| 252 | ret = CMD_ERROR; |
| 253 | goto error; |
| 254 | } |
| 255 | if (ret < 0) { |
| 256 | ret = CMD_FATAL; |
| 257 | goto error; |
| 258 | } |
| 259 | |
| 260 | ret = lttng_snapshot_del_output(current_session_name, output); |
| 261 | if (ret < 0) { |
| 262 | goto error; |
| 263 | } |
| 264 | |
| 265 | ret = mi_lttng_snapshot_del_output(writer, id, name, current_session_name); |
| 266 | if (ret) { |
| 267 | ret = CMD_ERROR; |
| 268 | } |
| 269 | |
| 270 | error: |
| 271 | lttng_snapshot_output_destroy(output); |
| 272 | return ret; |
| 273 | } |
| 274 | |
| 275 | /* |
| 276 | * Delete output by ID. |
| 277 | */ |
| 278 | static int del_output(uint32_t id, const char *name) |
| 279 | { |
| 280 | int ret; |
| 281 | struct lttng_snapshot_output *output = NULL; |
| 282 | |
| 283 | output = lttng_snapshot_output_create(); |
| 284 | if (!output) { |
| 285 | ret = CMD_FATAL; |
| 286 | goto error; |
| 287 | } |
| 288 | |
| 289 | if (name) { |
| 290 | ret = lttng_snapshot_output_set_name(name, output); |
| 291 | } else if (id != UINT32_MAX) { |
| 292 | ret = lttng_snapshot_output_set_id(id, output); |
| 293 | } else { |
| 294 | ret = CMD_ERROR; |
| 295 | goto error; |
| 296 | } |
| 297 | if (ret < 0) { |
| 298 | ret = CMD_FATAL; |
| 299 | goto error; |
| 300 | } |
| 301 | |
| 302 | ret = lttng_snapshot_del_output(current_session_name, output); |
| 303 | if (ret < 0) { |
| 304 | goto error; |
| 305 | } |
| 306 | |
| 307 | if (id != UINT32_MAX) { |
| 308 | MSG("Snapshot output id %" PRIu32 " successfully deleted for session %s", |
| 309 | id, current_session_name); |
| 310 | } else { |
| 311 | MSG("Snapshot output %s successfully deleted for session %s", |
| 312 | name, current_session_name); |
| 313 | } |
| 314 | |
| 315 | error: |
| 316 | lttng_snapshot_output_destroy(output); |
| 317 | return ret; |
| 318 | } |
| 319 | |
| 320 | /* |
| 321 | * Add output from the user URL (machine interface). |
| 322 | */ |
| 323 | static int mi_add_output(const char *url) |
| 324 | { |
| 325 | int ret; |
| 326 | struct lttng_snapshot_output *output = NULL; |
| 327 | char name[NAME_MAX]; |
| 328 | const char *n_ptr; |
| 329 | |
| 330 | if (!url && (!opt_data_url || !opt_ctrl_url)) { |
| 331 | ret = CMD_ERROR; |
| 332 | goto error; |
| 333 | } |
| 334 | |
| 335 | output = create_output_from_args(url); |
| 336 | if (!output) { |
| 337 | ret = CMD_FATAL; |
| 338 | goto error; |
| 339 | } |
| 340 | |
| 341 | /* This call, if successful, populates the id of the output object. */ |
| 342 | ret = lttng_snapshot_add_output(current_session_name, output); |
| 343 | if (ret < 0) { |
| 344 | goto error; |
| 345 | } |
| 346 | |
| 347 | n_ptr = lttng_snapshot_output_get_name(output); |
| 348 | if (*n_ptr == '\0') { |
| 349 | int pret; |
| 350 | pret = snprintf(name, sizeof(name), DEFAULT_SNAPSHOT_NAME "-%" PRIu32, |
| 351 | lttng_snapshot_output_get_id(output)); |
| 352 | if (pret < 0) { |
| 353 | PERROR("snprintf add output name"); |
| 354 | } |
| 355 | n_ptr = name; |
| 356 | } |
| 357 | |
| 358 | ret = mi_lttng_snapshot_add_output(writer, current_session_name, n_ptr, |
| 359 | output); |
| 360 | if (ret) { |
| 361 | ret = CMD_ERROR; |
| 362 | } |
| 363 | |
| 364 | error: |
| 365 | lttng_snapshot_output_destroy(output); |
| 366 | return ret; |
| 367 | } |
| 368 | |
| 369 | /* |
| 370 | * Add output from the user URL. |
| 371 | */ |
| 372 | static int add_output(const char *url) |
| 373 | { |
| 374 | int ret; |
| 375 | struct lttng_snapshot_output *output = NULL; |
| 376 | char name[NAME_MAX]; |
| 377 | const char *n_ptr; |
| 378 | |
| 379 | if (!url && (!opt_data_url || !opt_ctrl_url)) { |
| 380 | ret = CMD_ERROR; |
| 381 | goto error; |
| 382 | } |
| 383 | |
| 384 | output = create_output_from_args(url); |
| 385 | if (!output) { |
| 386 | ret = CMD_FATAL; |
| 387 | goto error; |
| 388 | } |
| 389 | |
| 390 | /* This call, if successful, populates the id of the output object. */ |
| 391 | ret = lttng_snapshot_add_output(current_session_name, output); |
| 392 | if (ret < 0) { |
| 393 | goto error; |
| 394 | } |
| 395 | |
| 396 | n_ptr = lttng_snapshot_output_get_name(output); |
| 397 | if (*n_ptr == '\0') { |
| 398 | int pret; |
| 399 | pret = snprintf(name, sizeof(name), DEFAULT_SNAPSHOT_NAME "-%" PRIu32, |
| 400 | lttng_snapshot_output_get_id(output)); |
| 401 | if (pret < 0) { |
| 402 | PERROR("snprintf add output name"); |
| 403 | } |
| 404 | n_ptr = name; |
| 405 | } |
| 406 | |
| 407 | MSG("Snapshot output successfully added for session %s", |
| 408 | current_session_name); |
| 409 | MSG(" [%" PRIu32 "] %s: %s (max-size: %" PRId64 ")", |
| 410 | lttng_snapshot_output_get_id(output), n_ptr, |
| 411 | lttng_snapshot_output_get_ctrl_url(output), |
| 412 | lttng_snapshot_output_get_maxsize(output)); |
| 413 | error: |
| 414 | lttng_snapshot_output_destroy(output); |
| 415 | return ret; |
| 416 | } |
| 417 | |
| 418 | static int cmd_add_output(int argc, const char **argv) |
| 419 | { |
| 420 | int ret; |
| 421 | |
| 422 | if (argc < 2 && (!opt_data_url || !opt_ctrl_url)) { |
| 423 | ret = CMD_ERROR; |
| 424 | goto end; |
| 425 | } |
| 426 | |
| 427 | if (lttng_opt_mi) { |
| 428 | ret = mi_add_output(argv[1]); |
| 429 | } else { |
| 430 | ret = add_output(argv[1]); |
| 431 | } |
| 432 | |
| 433 | end: |
| 434 | return ret; |
| 435 | } |
| 436 | |
| 437 | static int cmd_del_output(int argc, const char **argv) |
| 438 | { |
| 439 | int ret; |
| 440 | char *name; |
| 441 | long id; |
| 442 | |
| 443 | if (argc < 2) { |
| 444 | ret = CMD_ERROR; |
| 445 | goto end; |
| 446 | } |
| 447 | |
| 448 | errno = 0; |
| 449 | id = strtol(argv[1], &name, 10); |
| 450 | if (id == 0 && errno == 0) { |
| 451 | if (lttng_opt_mi) { |
| 452 | ret = mi_del_output(UINT32_MAX, name); |
| 453 | } else { |
| 454 | ret = del_output(UINT32_MAX, name); |
| 455 | } |
| 456 | } else if (errno == 0 && *name == '\0') { |
| 457 | if (lttng_opt_mi) { |
| 458 | ret = mi_del_output(id, NULL); |
| 459 | } else { |
| 460 | ret = del_output(id, NULL); |
| 461 | } |
| 462 | } else { |
| 463 | ERR("Argument %s not recognized", argv[1]); |
| 464 | ret = -1; |
| 465 | goto end; |
| 466 | } |
| 467 | |
| 468 | end: |
| 469 | return ret; |
| 470 | } |
| 471 | |
| 472 | static int cmd_list_output(int argc, const char **argv) |
| 473 | { |
| 474 | int ret; |
| 475 | |
| 476 | if (lttng_opt_mi) { |
| 477 | ret = mi_list_output(); |
| 478 | } else { |
| 479 | ret = list_output(); |
| 480 | } |
| 481 | |
| 482 | return ret; |
| 483 | } |
| 484 | |
| 485 | /* |
| 486 | * Do a snapshot record with the URL if one is given (machine interface). |
| 487 | */ |
| 488 | static int mi_record(const char *url) |
| 489 | { |
| 490 | int ret; |
| 491 | struct lttng_snapshot_output *output = NULL; |
| 492 | |
| 493 | output = create_output_from_args(url); |
| 494 | if (!output) { |
| 495 | ret = CMD_FATAL; |
| 496 | goto error; |
| 497 | } |
| 498 | |
| 499 | ret = lttng_snapshot_record(current_session_name, output, 0); |
| 500 | if (ret < 0) { |
| 501 | ret = CMD_ERROR; |
| 502 | goto error; |
| 503 | } |
| 504 | |
| 505 | ret = mi_lttng_snapshot_record(writer, current_session_name, url, |
| 506 | opt_ctrl_url, opt_data_url); |
| 507 | if (ret) { |
| 508 | ret = CMD_ERROR; |
| 509 | } |
| 510 | |
| 511 | error: |
| 512 | lttng_snapshot_output_destroy(output); |
| 513 | return ret; |
| 514 | } |
| 515 | |
| 516 | /* |
| 517 | * Do a snapshot record with the URL if one is given. |
| 518 | */ |
| 519 | static int record(const char *url) |
| 520 | { |
| 521 | int ret; |
| 522 | struct lttng_snapshot_output *output = NULL; |
| 523 | |
| 524 | output = create_output_from_args(url); |
| 525 | if (!output) { |
| 526 | ret = CMD_FATAL; |
| 527 | goto error; |
| 528 | } |
| 529 | |
| 530 | ret = lttng_snapshot_record(current_session_name, output, 0); |
| 531 | if (ret < 0) { |
| 532 | if (ret == -LTTNG_ERR_MAX_SIZE_INVALID) { |
| 533 | ERR("Invalid snapshot size. Cannot fit at least one packet per stream."); |
| 534 | } |
| 535 | goto error; |
| 536 | } |
| 537 | |
| 538 | MSG("Snapshot recorded successfully for session %s", current_session_name); |
| 539 | |
| 540 | if (url) { |
| 541 | MSG("Snapshot written at: %s", url); |
| 542 | } else if (opt_ctrl_url) { |
| 543 | MSG("Snapshot written to ctrl: %s, data: %s", opt_ctrl_url, |
| 544 | opt_data_url); |
| 545 | } |
| 546 | |
| 547 | error: |
| 548 | lttng_snapshot_output_destroy(output); |
| 549 | return ret; |
| 550 | } |
| 551 | |
| 552 | static int cmd_record(int argc, const char **argv) |
| 553 | { |
| 554 | int ret; |
| 555 | |
| 556 | if (argc == 2) { |
| 557 | /* With a given URL */ |
| 558 | if (lttng_opt_mi) { |
| 559 | ret = mi_record(argv[1]); |
| 560 | } else { |
| 561 | ret = record(argv[1]); |
| 562 | } |
| 563 | } else { |
| 564 | if (lttng_opt_mi) { |
| 565 | ret = mi_record(NULL); |
| 566 | } else { |
| 567 | ret = record(NULL); |
| 568 | } |
| 569 | } |
| 570 | |
| 571 | return ret; |
| 572 | } |
| 573 | |
| 574 | static int handle_command(const char **argv) |
| 575 | { |
| 576 | int ret = CMD_SUCCESS, i = 0, argc, command_ret = CMD_SUCCESS; |
| 577 | struct cmd_struct *cmd; |
| 578 | |
| 579 | if (argv == NULL || (!opt_ctrl_url && opt_data_url) || |
| 580 | (opt_ctrl_url && !opt_data_url)) { |
| 581 | command_ret = CMD_ERROR; |
| 582 | goto end; |
| 583 | } |
| 584 | |
| 585 | argc = count_arguments(argv); |
| 586 | |
| 587 | cmd = &actions[i]; |
| 588 | while (cmd->func != NULL) { |
| 589 | /* Find command */ |
| 590 | if (strcmp(argv[0], cmd->name) == 0) { |
| 591 | if (lttng_opt_mi) { |
| 592 | /* Action element */ |
| 593 | ret = mi_lttng_writer_open_element(writer, |
| 594 | mi_lttng_element_command_action); |
| 595 | if (ret) { |
| 596 | ret = CMD_ERROR; |
| 597 | goto end; |
| 598 | } |
| 599 | |
| 600 | /* Name of the action */ |
| 601 | ret = mi_lttng_writer_write_element_string(writer, |
| 602 | config_element_name, argv[0]); |
| 603 | if (ret) { |
| 604 | ret = CMD_ERROR; |
| 605 | goto end; |
| 606 | } |
| 607 | |
| 608 | /* Open output element */ |
| 609 | ret = mi_lttng_writer_open_element(writer, |
| 610 | mi_lttng_element_command_output); |
| 611 | if (ret) { |
| 612 | ret = CMD_ERROR; |
| 613 | goto end; |
| 614 | } |
| 615 | } |
| 616 | |
| 617 | command_ret = cmd->func(argc, argv); |
| 618 | |
| 619 | if (lttng_opt_mi) { |
| 620 | /* Close output and action element */ |
| 621 | ret = mi_lttng_close_multi_element(writer, 2); |
| 622 | if (ret) { |
| 623 | ret = CMD_ERROR; |
| 624 | goto end; |
| 625 | } |
| 626 | } |
| 627 | goto end; |
| 628 | } |
| 629 | i++; |
| 630 | cmd = &actions[i]; |
| 631 | } |
| 632 | |
| 633 | ret = CMD_UNDEFINED; |
| 634 | |
| 635 | end: |
| 636 | /* Overwrite ret if an error occurred in cmd->func() */ |
| 637 | ret = command_ret ? command_ret : ret; |
| 638 | return ret; |
| 639 | } |
| 640 | /* |
| 641 | * The 'snapshot <cmd> <options>' first level command |
| 642 | */ |
| 643 | int cmd_snapshot(int argc, const char **argv) |
| 644 | { |
| 645 | int opt, ret = CMD_SUCCESS, command_ret = CMD_SUCCESS, success = 1; |
| 646 | char *session_name = NULL; |
| 647 | static poptContext pc; |
| 648 | |
| 649 | pc = poptGetContext(NULL, argc, argv, snapshot_opts, 0); |
| 650 | poptReadDefaultConfig(pc, 0); |
| 651 | |
| 652 | /* Mi check */ |
| 653 | if (lttng_opt_mi) { |
| 654 | writer = mi_lttng_writer_create(fileno(stdout), lttng_opt_mi); |
| 655 | if (!writer) { |
| 656 | ret = -LTTNG_ERR_NOMEM; |
| 657 | goto end; |
| 658 | } |
| 659 | |
| 660 | /* Open command element */ |
| 661 | ret = mi_lttng_writer_command_open(writer, |
| 662 | mi_lttng_element_command_snapshot); |
| 663 | if (ret) { |
| 664 | ret = CMD_ERROR; |
| 665 | goto end; |
| 666 | } |
| 667 | |
| 668 | /* Open output element */ |
| 669 | ret = mi_lttng_writer_open_element(writer, |
| 670 | mi_lttng_element_command_output); |
| 671 | if (ret) { |
| 672 | ret = CMD_ERROR; |
| 673 | goto end; |
| 674 | } |
| 675 | } |
| 676 | |
| 677 | while ((opt = poptGetNextOpt(pc)) != -1) { |
| 678 | switch (opt) { |
| 679 | case OPT_HELP: |
| 680 | SHOW_HELP(); |
| 681 | goto end; |
| 682 | case OPT_LIST_OPTIONS: |
| 683 | list_cmd_options(stdout, snapshot_opts); |
| 684 | goto end; |
| 685 | case OPT_LIST_COMMANDS: |
| 686 | list_commands(actions, stdout); |
| 687 | goto end; |
| 688 | case OPT_MAX_SIZE: |
| 689 | { |
| 690 | uint64_t val; |
| 691 | const char *opt = poptGetOptArg(pc); |
| 692 | |
| 693 | if (utils_parse_size_suffix((char *) opt, &val) < 0) { |
| 694 | ERR("Unable to handle max-size value %s", opt); |
| 695 | ret = CMD_ERROR; |
| 696 | goto end; |
| 697 | } |
| 698 | |
| 699 | opt_max_size = val; |
| 700 | |
| 701 | break; |
| 702 | } |
| 703 | default: |
| 704 | ret = CMD_UNDEFINED; |
| 705 | goto end; |
| 706 | } |
| 707 | } |
| 708 | |
| 709 | if (!opt_session_name) { |
| 710 | session_name = get_session_name(); |
| 711 | if (session_name == NULL) { |
| 712 | ret = CMD_ERROR; |
| 713 | goto end; |
| 714 | } |
| 715 | current_session_name = session_name; |
| 716 | } else { |
| 717 | current_session_name = opt_session_name; |
| 718 | } |
| 719 | |
| 720 | command_ret = handle_command(poptGetArgs(pc)); |
| 721 | if (command_ret) { |
| 722 | switch (-command_ret) { |
| 723 | case LTTNG_ERR_EPERM: |
| 724 | ERR("The session needs to be set in no output mode (--no-output)"); |
| 725 | break; |
| 726 | case LTTNG_ERR_SNAPSHOT_NODATA: |
| 727 | WARN("%s", lttng_strerror(command_ret)); |
| 728 | |
| 729 | /* A warning is fine since the user has no control on |
| 730 | * whether or not applications (or the kernel) have |
| 731 | * produced any event between the start of the tracing |
| 732 | * session and the recording of the snapshot. MI wise |
| 733 | * the command is not a success since nothing was |
| 734 | * recorded. |
| 735 | */ |
| 736 | command_ret = 0; |
| 737 | break; |
| 738 | default: |
| 739 | ERR("%s", lttng_strerror(command_ret)); |
| 740 | break; |
| 741 | } |
| 742 | success = 0; |
| 743 | } |
| 744 | |
| 745 | if (lttng_opt_mi) { |
| 746 | /* Close output element */ |
| 747 | ret = mi_lttng_writer_close_element(writer); |
| 748 | if (ret) { |
| 749 | ret = CMD_ERROR; |
| 750 | goto end; |
| 751 | } |
| 752 | |
| 753 | /* Success ? */ |
| 754 | ret = mi_lttng_writer_write_element_bool(writer, |
| 755 | mi_lttng_element_command_success, success); |
| 756 | if (ret) { |
| 757 | ret = CMD_ERROR; |
| 758 | goto end; |
| 759 | } |
| 760 | |
| 761 | /* Command element close */ |
| 762 | ret = mi_lttng_writer_command_close(writer); |
| 763 | if (ret) { |
| 764 | ret = CMD_ERROR; |
| 765 | goto end; |
| 766 | } |
| 767 | } |
| 768 | |
| 769 | end: |
| 770 | /* Mi clean-up */ |
| 771 | if (writer && mi_lttng_writer_destroy(writer)) { |
| 772 | /* Preserve original error code */ |
| 773 | ret = ret ? ret : -LTTNG_ERR_MI_IO_FAIL; |
| 774 | } |
| 775 | |
| 776 | if (!opt_session_name) { |
| 777 | free(session_name); |
| 778 | } |
| 779 | |
| 780 | /* Overwrite ret if an error occurred during handle_command */ |
| 781 | ret = command_ret ? command_ret : ret; |
| 782 | poptFreeContext(pc); |
| 783 | return ret; |
| 784 | } |