| 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 _GNU_SOURCE |
| 19 | #define _LGPL_SOURCE |
| 20 | #include <assert.h> |
| 21 | #include <inttypes.h> |
| 22 | #include <popt.h> |
| 23 | #include <stdio.h> |
| 24 | #include <stdlib.h> |
| 25 | #include <string.h> |
| 26 | #include <sys/stat.h> |
| 27 | #include <sys/types.h> |
| 28 | #include <unistd.h> |
| 29 | #include <assert.h> |
| 30 | |
| 31 | #include <common/utils.h> |
| 32 | #include <common/mi-lttng.h> |
| 33 | #include <lttng/snapshot.h> |
| 34 | |
| 35 | #include "../command.h" |
| 36 | |
| 37 | static const char *opt_session_name; |
| 38 | static const char *opt_output_name; |
| 39 | static const char *opt_data_url; |
| 40 | static const char *opt_ctrl_url; |
| 41 | static const char *current_session_name; |
| 42 | static uint64_t opt_max_size; |
| 43 | |
| 44 | /* Stub for the cmd struct actions. */ |
| 45 | static int cmd_add_output(int argc, const char **argv); |
| 46 | static int cmd_del_output(int argc, const char **argv); |
| 47 | static int cmd_list_output(int argc, const char **argv); |
| 48 | static int cmd_record(int argc, const char **argv); |
| 49 | |
| 50 | static const char *indent4 = " "; |
| 51 | |
| 52 | enum { |
| 53 | OPT_HELP = 1, |
| 54 | OPT_LIST_OPTIONS, |
| 55 | OPT_MAX_SIZE, |
| 56 | OPT_LIST_COMMANDS, |
| 57 | }; |
| 58 | |
| 59 | static struct mi_writer *writer; |
| 60 | |
| 61 | static struct poptOption snapshot_opts[] = { |
| 62 | /* longName, shortName, argInfo, argPtr, value, descrip, argDesc */ |
| 63 | {"help", 'h', POPT_ARG_NONE, 0, OPT_HELP, 0, 0}, |
| 64 | {"session", 's', POPT_ARG_STRING, &opt_session_name, 0, 0, 0}, |
| 65 | {"ctrl-url", 'C', POPT_ARG_STRING, &opt_ctrl_url, 0, 0, 0}, |
| 66 | {"data-url", 'D', POPT_ARG_STRING, &opt_data_url, 0, 0, 0}, |
| 67 | {"name", 'n', POPT_ARG_STRING, &opt_output_name, 0, 0, 0}, |
| 68 | {"max-size", 'm', POPT_ARG_STRING, 0, OPT_MAX_SIZE, 0, 0}, |
| 69 | {"list-options", 0, POPT_ARG_NONE, NULL, OPT_LIST_OPTIONS, NULL, NULL}, |
| 70 | {"list-commands", 0, POPT_ARG_NONE, NULL, OPT_LIST_COMMANDS}, |
| 71 | {0, 0, 0, 0, 0, 0, 0} |
| 72 | }; |
| 73 | |
| 74 | static struct cmd_struct actions[] = { |
| 75 | { "add-output", cmd_add_output }, |
| 76 | { "del-output", cmd_del_output }, |
| 77 | { "list-output", cmd_list_output }, |
| 78 | { "record", cmd_record }, |
| 79 | { NULL, NULL } /* Array closure */ |
| 80 | }; |
| 81 | |
| 82 | /* |
| 83 | * usage |
| 84 | */ |
| 85 | static void usage(FILE *ofp) |
| 86 | { |
| 87 | fprintf(ofp, "usage: lttng snapshot [OPTION] ACTION\n"); |
| 88 | fprintf(ofp, "\n"); |
| 89 | fprintf(ofp, "Actions:\n"); |
| 90 | fprintf(ofp, " add-output [-m <SIZE>] [-s <NAME>] [-n <NAME>] <URL> | -C <URL> -D <URL>\n"); |
| 91 | fprintf(ofp, " Setup and add an snapshot output for a session.\n"); |
| 92 | fprintf(ofp, "\n"); |
| 93 | fprintf(ofp, " del-output ID | NAME [-s <NAME>]\n"); |
| 94 | fprintf(ofp, " Delete an output for a session using the ID.\n"); |
| 95 | fprintf(ofp, "\n"); |
| 96 | fprintf(ofp, " list-output [-s <NAME>]\n"); |
| 97 | fprintf(ofp, " List the output of a session.\n"); |
| 98 | fprintf(ofp, "\n"); |
| 99 | fprintf(ofp, " record [-m <SIZE>] [-s <NAME>] [-n <NAME>] [<URL> | -C <URL> -D <URL>]\n"); |
| 100 | fprintf(ofp, " Snapshot a session's buffer(s) for all domains. If an URL is\n"); |
| 101 | fprintf(ofp, " specified, it is used instead of a previously added output.\n"); |
| 102 | fprintf(ofp, " Specifying only a name or/a size will override the current output value.\n"); |
| 103 | fprintf(ofp, " For instance, you can record a snapshot with a custom maximum size\n"); |
| 104 | fprintf(ofp, " or with a different name.\n"); |
| 105 | fprintf(ofp, "\n"); |
| 106 | fprintf(ofp, "Options:\n"); |
| 107 | fprintf(ofp, " -h, --help Show this help\n"); |
| 108 | fprintf(ofp, " --list-options Simple listing of options\n"); |
| 109 | fprintf(ofp, " -s, --session NAME Apply to session name\n"); |
| 110 | fprintf(ofp, " -n, --name NAME Name of the output or snapshot\n"); |
| 111 | fprintf(ofp, " -m, --max-size SIZE Maximum bytes size of the snapshot {+k,+M,+G}\n"); |
| 112 | fprintf(ofp, " -C, --ctrl-url URL Set control path URL. (Must use -D also)\n"); |
| 113 | fprintf(ofp, " -D, --data-url URL Set data path URL. (Must use -C also)\n"); |
| 114 | fprintf(ofp, "\n"); |
| 115 | } |
| 116 | |
| 117 | /* |
| 118 | * Count and return the number of arguments in argv. |
| 119 | */ |
| 120 | static int count_arguments(const char **argv) |
| 121 | { |
| 122 | int i = 0; |
| 123 | |
| 124 | assert(argv); |
| 125 | |
| 126 | while (argv[i] != NULL) { |
| 127 | i++; |
| 128 | } |
| 129 | |
| 130 | return i; |
| 131 | } |
| 132 | |
| 133 | /* |
| 134 | * Create a snapshot output object from arguments using the given URL. |
| 135 | * |
| 136 | * Return a newly allocated object or NULL on error. |
| 137 | */ |
| 138 | static struct lttng_snapshot_output *create_output_from_args(const char *url) |
| 139 | { |
| 140 | int ret = 0; |
| 141 | struct lttng_snapshot_output *output = NULL; |
| 142 | |
| 143 | output = lttng_snapshot_output_create(); |
| 144 | if (!output) { |
| 145 | goto error_create; |
| 146 | } |
| 147 | |
| 148 | if (url) { |
| 149 | ret = lttng_snapshot_output_set_ctrl_url(url, output); |
| 150 | if (ret < 0) { |
| 151 | goto error; |
| 152 | } |
| 153 | } else if (opt_ctrl_url) { |
| 154 | ret = lttng_snapshot_output_set_ctrl_url(opt_ctrl_url, output); |
| 155 | if (ret < 0) { |
| 156 | goto error; |
| 157 | } |
| 158 | } |
| 159 | |
| 160 | if (opt_data_url) { |
| 161 | ret = lttng_snapshot_output_set_data_url(opt_data_url, output); |
| 162 | if (ret < 0) { |
| 163 | goto error; |
| 164 | } |
| 165 | } |
| 166 | |
| 167 | if (opt_max_size) { |
| 168 | ret = lttng_snapshot_output_set_size(opt_max_size, output); |
| 169 | if (ret < 0) { |
| 170 | goto error; |
| 171 | } |
| 172 | } |
| 173 | |
| 174 | if (opt_output_name) { |
| 175 | ret = lttng_snapshot_output_set_name(opt_output_name, output); |
| 176 | if (ret < 0) { |
| 177 | goto error; |
| 178 | } |
| 179 | } |
| 180 | |
| 181 | return output; |
| 182 | |
| 183 | error: |
| 184 | lttng_snapshot_output_destroy(output); |
| 185 | error_create: |
| 186 | return NULL; |
| 187 | } |
| 188 | |
| 189 | static int mi_list_output(void) |
| 190 | { |
| 191 | int ret; |
| 192 | struct lttng_snapshot_output *s_iter; |
| 193 | struct lttng_snapshot_output_list *list; |
| 194 | |
| 195 | assert(writer); |
| 196 | |
| 197 | ret = lttng_snapshot_list_output(current_session_name, &list); |
| 198 | if (ret < 0) { |
| 199 | goto error; |
| 200 | } |
| 201 | |
| 202 | ret = mi_lttng_snapshot_output_session_name(writer, current_session_name); |
| 203 | if (ret) { |
| 204 | ret = CMD_ERROR; |
| 205 | goto end; |
| 206 | } |
| 207 | |
| 208 | while ((s_iter = lttng_snapshot_output_list_get_next(list)) != NULL) { |
| 209 | ret = mi_lttng_snapshot_list_output(writer, s_iter); |
| 210 | if (ret) { |
| 211 | ret = CMD_ERROR; |
| 212 | goto end; |
| 213 | } |
| 214 | } |
| 215 | |
| 216 | |
| 217 | /* Close snapshot snapshots element */ |
| 218 | ret = mi_lttng_writer_close_element(writer); |
| 219 | if (ret) { |
| 220 | ret = CMD_ERROR; |
| 221 | goto end; |
| 222 | } |
| 223 | |
| 224 | /* Close snapshot session element */ |
| 225 | ret = mi_lttng_writer_close_element(writer); |
| 226 | if (ret) { |
| 227 | ret = CMD_ERROR; |
| 228 | } |
| 229 | end: |
| 230 | lttng_snapshot_output_list_destroy(list); |
| 231 | error: |
| 232 | return ret; |
| 233 | } |
| 234 | |
| 235 | static int list_output(void) |
| 236 | { |
| 237 | int ret, output_seen = 0; |
| 238 | struct lttng_snapshot_output *s_iter; |
| 239 | struct lttng_snapshot_output_list *list; |
| 240 | |
| 241 | ret = lttng_snapshot_list_output(current_session_name, &list); |
| 242 | if (ret < 0) { |
| 243 | goto error; |
| 244 | } |
| 245 | |
| 246 | MSG("Snapshot output list for session %s", current_session_name); |
| 247 | |
| 248 | while ((s_iter = lttng_snapshot_output_list_get_next(list)) != NULL) { |
| 249 | MSG("%s[%" PRIu32 "] %s: %s (max-size: %" PRId64 ")", indent4, |
| 250 | lttng_snapshot_output_get_id(s_iter), |
| 251 | lttng_snapshot_output_get_name(s_iter), |
| 252 | lttng_snapshot_output_get_ctrl_url(s_iter), |
| 253 | lttng_snapshot_output_get_maxsize(s_iter)); |
| 254 | output_seen = 1; |
| 255 | } |
| 256 | |
| 257 | lttng_snapshot_output_list_destroy(list); |
| 258 | |
| 259 | if (!output_seen) { |
| 260 | MSG("%sNone", indent4); |
| 261 | } |
| 262 | |
| 263 | error: |
| 264 | return ret; |
| 265 | } |
| 266 | |
| 267 | /* |
| 268 | * Delete output by ID (machine interface version). |
| 269 | */ |
| 270 | static int mi_del_output(uint32_t id, const char *name) |
| 271 | { |
| 272 | int ret; |
| 273 | struct lttng_snapshot_output *output = NULL; |
| 274 | |
| 275 | assert(writer); |
| 276 | |
| 277 | output = lttng_snapshot_output_create(); |
| 278 | if (!output) { |
| 279 | ret = CMD_FATAL; |
| 280 | goto error; |
| 281 | } |
| 282 | |
| 283 | if (name) { |
| 284 | ret = lttng_snapshot_output_set_name(name, output); |
| 285 | } else if (id != UINT32_MAX) { |
| 286 | ret = lttng_snapshot_output_set_id(id, output); |
| 287 | } else { |
| 288 | ret = CMD_ERROR; |
| 289 | goto error; |
| 290 | } |
| 291 | if (ret < 0) { |
| 292 | ret = CMD_FATAL; |
| 293 | goto error; |
| 294 | } |
| 295 | |
| 296 | ret = lttng_snapshot_del_output(current_session_name, output); |
| 297 | if (ret < 0) { |
| 298 | goto error; |
| 299 | } |
| 300 | |
| 301 | ret = mi_lttng_snapshot_del_output(writer, id, name, current_session_name); |
| 302 | if (ret) { |
| 303 | ret = CMD_ERROR; |
| 304 | } |
| 305 | |
| 306 | error: |
| 307 | lttng_snapshot_output_destroy(output); |
| 308 | return ret; |
| 309 | } |
| 310 | |
| 311 | /* |
| 312 | * Delete output by ID. |
| 313 | */ |
| 314 | static int del_output(uint32_t id, const char *name) |
| 315 | { |
| 316 | int ret; |
| 317 | struct lttng_snapshot_output *output = NULL; |
| 318 | |
| 319 | output = lttng_snapshot_output_create(); |
| 320 | if (!output) { |
| 321 | ret = CMD_FATAL; |
| 322 | goto error; |
| 323 | } |
| 324 | |
| 325 | if (name) { |
| 326 | ret = lttng_snapshot_output_set_name(name, output); |
| 327 | } else if (id != UINT32_MAX) { |
| 328 | ret = lttng_snapshot_output_set_id(id, output); |
| 329 | } else { |
| 330 | ret = CMD_ERROR; |
| 331 | goto error; |
| 332 | } |
| 333 | if (ret < 0) { |
| 334 | ret = CMD_FATAL; |
| 335 | goto error; |
| 336 | } |
| 337 | |
| 338 | ret = lttng_snapshot_del_output(current_session_name, output); |
| 339 | if (ret < 0) { |
| 340 | goto error; |
| 341 | } |
| 342 | |
| 343 | if (id != UINT32_MAX) { |
| 344 | MSG("Snapshot output id %" PRIu32 " successfully deleted for session %s", |
| 345 | id, current_session_name); |
| 346 | } else { |
| 347 | MSG("Snapshot output %s successfully deleted for session %s", |
| 348 | name, current_session_name); |
| 349 | } |
| 350 | |
| 351 | error: |
| 352 | lttng_snapshot_output_destroy(output); |
| 353 | return ret; |
| 354 | } |
| 355 | |
| 356 | /* |
| 357 | * Add output from the user URL (machine interface). |
| 358 | */ |
| 359 | static int mi_add_output(const char *url) |
| 360 | { |
| 361 | int ret; |
| 362 | struct lttng_snapshot_output *output = NULL; |
| 363 | char name[NAME_MAX]; |
| 364 | const char *n_ptr; |
| 365 | |
| 366 | if (!url && (!opt_data_url || !opt_ctrl_url)) { |
| 367 | ret = CMD_ERROR; |
| 368 | goto error; |
| 369 | } |
| 370 | |
| 371 | output = create_output_from_args(url); |
| 372 | if (!output) { |
| 373 | ret = CMD_FATAL; |
| 374 | goto error; |
| 375 | } |
| 376 | |
| 377 | /* This call, if successful, populates the id of the output object. */ |
| 378 | ret = lttng_snapshot_add_output(current_session_name, output); |
| 379 | if (ret < 0) { |
| 380 | goto error; |
| 381 | } |
| 382 | |
| 383 | n_ptr = lttng_snapshot_output_get_name(output); |
| 384 | if (*n_ptr == '\0') { |
| 385 | int pret; |
| 386 | pret = snprintf(name, sizeof(name), DEFAULT_SNAPSHOT_NAME "-%" PRIu32, |
| 387 | lttng_snapshot_output_get_id(output)); |
| 388 | if (pret < 0) { |
| 389 | PERROR("snprintf add output name"); |
| 390 | } |
| 391 | n_ptr = name; |
| 392 | } |
| 393 | |
| 394 | ret = mi_lttng_snapshot_add_output(writer, current_session_name, n_ptr, |
| 395 | output); |
| 396 | if (ret) { |
| 397 | ret = CMD_ERROR; |
| 398 | } |
| 399 | |
| 400 | error: |
| 401 | lttng_snapshot_output_destroy(output); |
| 402 | return ret; |
| 403 | } |
| 404 | |
| 405 | /* |
| 406 | * Add output from the user URL. |
| 407 | */ |
| 408 | static int add_output(const char *url) |
| 409 | { |
| 410 | int ret; |
| 411 | struct lttng_snapshot_output *output = NULL; |
| 412 | char name[NAME_MAX]; |
| 413 | const char *n_ptr; |
| 414 | |
| 415 | if (!url && (!opt_data_url || !opt_ctrl_url)) { |
| 416 | ret = CMD_ERROR; |
| 417 | goto error; |
| 418 | } |
| 419 | |
| 420 | output = create_output_from_args(url); |
| 421 | if (!output) { |
| 422 | ret = CMD_FATAL; |
| 423 | goto error; |
| 424 | } |
| 425 | |
| 426 | /* This call, if successful, populates the id of the output object. */ |
| 427 | ret = lttng_snapshot_add_output(current_session_name, output); |
| 428 | if (ret < 0) { |
| 429 | goto error; |
| 430 | } |
| 431 | |
| 432 | n_ptr = lttng_snapshot_output_get_name(output); |
| 433 | if (*n_ptr == '\0') { |
| 434 | int pret; |
| 435 | pret = snprintf(name, sizeof(name), DEFAULT_SNAPSHOT_NAME "-%" PRIu32, |
| 436 | lttng_snapshot_output_get_id(output)); |
| 437 | if (pret < 0) { |
| 438 | PERROR("snprintf add output name"); |
| 439 | } |
| 440 | n_ptr = name; |
| 441 | } |
| 442 | |
| 443 | MSG("Snapshot output successfully added for session %s", |
| 444 | current_session_name); |
| 445 | MSG(" [%" PRIu32 "] %s: %s (max-size: %" PRId64 ")", |
| 446 | lttng_snapshot_output_get_id(output), n_ptr, |
| 447 | lttng_snapshot_output_get_ctrl_url(output), |
| 448 | lttng_snapshot_output_get_maxsize(output)); |
| 449 | error: |
| 450 | lttng_snapshot_output_destroy(output); |
| 451 | return ret; |
| 452 | } |
| 453 | |
| 454 | static int cmd_add_output(int argc, const char **argv) |
| 455 | { |
| 456 | int ret; |
| 457 | |
| 458 | if (argc < 2 && (!opt_data_url || !opt_ctrl_url)) { |
| 459 | usage(stderr); |
| 460 | ret = CMD_ERROR; |
| 461 | goto end; |
| 462 | } |
| 463 | |
| 464 | if (lttng_opt_mi) { |
| 465 | ret = mi_add_output(argv[1]); |
| 466 | } else { |
| 467 | ret = add_output(argv[1]); |
| 468 | } |
| 469 | |
| 470 | end: |
| 471 | return ret; |
| 472 | } |
| 473 | |
| 474 | static int cmd_del_output(int argc, const char **argv) |
| 475 | { |
| 476 | int ret; |
| 477 | char *name; |
| 478 | long id; |
| 479 | |
| 480 | if (argc < 2) { |
| 481 | usage(stderr); |
| 482 | ret = CMD_ERROR; |
| 483 | goto end; |
| 484 | } |
| 485 | |
| 486 | errno = 0; |
| 487 | id = strtol(argv[1], &name, 10); |
| 488 | if (id == 0 && errno == 0) { |
| 489 | if (lttng_opt_mi) { |
| 490 | ret = mi_del_output(UINT32_MAX, name); |
| 491 | } else { |
| 492 | ret = del_output(UINT32_MAX, name); |
| 493 | } |
| 494 | } else if (errno == 0 && *name == '\0') { |
| 495 | if (lttng_opt_mi) { |
| 496 | ret = mi_del_output(id, NULL); |
| 497 | } else { |
| 498 | ret = del_output(id, NULL); |
| 499 | } |
| 500 | } else { |
| 501 | ERR("Argument %s not recognized", argv[1]); |
| 502 | ret = -1; |
| 503 | goto end; |
| 504 | } |
| 505 | |
| 506 | end: |
| 507 | return ret; |
| 508 | } |
| 509 | |
| 510 | static int cmd_list_output(int argc, const char **argv) |
| 511 | { |
| 512 | int ret; |
| 513 | |
| 514 | if (lttng_opt_mi) { |
| 515 | ret = mi_list_output(); |
| 516 | } else { |
| 517 | ret = list_output(); |
| 518 | } |
| 519 | |
| 520 | return ret; |
| 521 | } |
| 522 | |
| 523 | /* |
| 524 | * Do a snapshot record with the URL if one is given (machine interface). |
| 525 | */ |
| 526 | static int mi_record(const char *url) |
| 527 | { |
| 528 | int ret; |
| 529 | struct lttng_snapshot_output *output = NULL; |
| 530 | |
| 531 | output = create_output_from_args(url); |
| 532 | if (!output) { |
| 533 | ret = CMD_FATAL; |
| 534 | goto error; |
| 535 | } |
| 536 | |
| 537 | ret = lttng_snapshot_record(current_session_name, output, 0); |
| 538 | if (ret < 0) { |
| 539 | ret = CMD_ERROR; |
| 540 | goto error; |
| 541 | } |
| 542 | |
| 543 | ret = mi_lttng_snapshot_record(writer, current_session_name, url, |
| 544 | opt_ctrl_url, opt_data_url); |
| 545 | if (ret) { |
| 546 | ret = CMD_ERROR; |
| 547 | } |
| 548 | |
| 549 | error: |
| 550 | lttng_snapshot_output_destroy(output); |
| 551 | return ret; |
| 552 | } |
| 553 | |
| 554 | /* |
| 555 | * Do a snapshot record with the URL if one is given. |
| 556 | */ |
| 557 | static int record(const char *url) |
| 558 | { |
| 559 | int ret; |
| 560 | struct lttng_snapshot_output *output = NULL; |
| 561 | |
| 562 | output = create_output_from_args(url); |
| 563 | if (!output) { |
| 564 | ret = CMD_FATAL; |
| 565 | goto error; |
| 566 | } |
| 567 | |
| 568 | ret = lttng_snapshot_record(current_session_name, output, 0); |
| 569 | if (ret < 0) { |
| 570 | if (ret == -LTTNG_ERR_MAX_SIZE_INVALID) { |
| 571 | ERR("Invalid snapshot size. Cannot fit at least one packet per stream."); |
| 572 | } |
| 573 | goto error; |
| 574 | } |
| 575 | |
| 576 | MSG("Snapshot recorded successfully for session %s", current_session_name); |
| 577 | |
| 578 | if (url) { |
| 579 | MSG("Snapshot written at: %s", url); |
| 580 | } else if (opt_ctrl_url) { |
| 581 | MSG("Snapshot written to ctrl: %s, data: %s", opt_ctrl_url, |
| 582 | opt_data_url); |
| 583 | } |
| 584 | |
| 585 | error: |
| 586 | lttng_snapshot_output_destroy(output); |
| 587 | return ret; |
| 588 | } |
| 589 | |
| 590 | static int cmd_record(int argc, const char **argv) |
| 591 | { |
| 592 | int ret; |
| 593 | |
| 594 | if (argc == 2) { |
| 595 | /* With a given URL */ |
| 596 | if (lttng_opt_mi) { |
| 597 | ret = mi_record(argv[1]); |
| 598 | } else { |
| 599 | ret = record(argv[1]); |
| 600 | } |
| 601 | } else { |
| 602 | if (lttng_opt_mi) { |
| 603 | ret = mi_record(NULL); |
| 604 | } else { |
| 605 | ret = record(NULL); |
| 606 | } |
| 607 | } |
| 608 | |
| 609 | return ret; |
| 610 | } |
| 611 | |
| 612 | static int handle_command(const char **argv) |
| 613 | { |
| 614 | int ret = CMD_SUCCESS, i = 0, argc, command_ret = CMD_SUCCESS; |
| 615 | struct cmd_struct *cmd; |
| 616 | |
| 617 | if (argv == NULL || (!opt_ctrl_url && opt_data_url) || |
| 618 | (opt_ctrl_url && !opt_data_url)) { |
| 619 | usage(stderr); |
| 620 | command_ret = CMD_ERROR; |
| 621 | goto end; |
| 622 | } |
| 623 | |
| 624 | argc = count_arguments(argv); |
| 625 | |
| 626 | cmd = &actions[i]; |
| 627 | while (cmd->func != NULL) { |
| 628 | /* Find command */ |
| 629 | if (strcmp(argv[0], cmd->name) == 0) { |
| 630 | if (lttng_opt_mi) { |
| 631 | /* Action element */ |
| 632 | ret = mi_lttng_writer_open_element(writer, |
| 633 | mi_lttng_element_command_action); |
| 634 | if (ret) { |
| 635 | ret = CMD_ERROR; |
| 636 | goto end; |
| 637 | } |
| 638 | |
| 639 | /* Name of the action */ |
| 640 | ret = mi_lttng_writer_write_element_string(writer, |
| 641 | config_element_name, argv[0]); |
| 642 | if (ret) { |
| 643 | ret = CMD_ERROR; |
| 644 | goto end; |
| 645 | } |
| 646 | |
| 647 | /* Open output element */ |
| 648 | ret = mi_lttng_writer_open_element(writer, |
| 649 | mi_lttng_element_command_output); |
| 650 | if (ret) { |
| 651 | ret = CMD_ERROR; |
| 652 | goto end; |
| 653 | } |
| 654 | } |
| 655 | |
| 656 | command_ret = cmd->func(argc, argv); |
| 657 | |
| 658 | if (lttng_opt_mi) { |
| 659 | /* Close output and action element */ |
| 660 | ret = mi_lttng_close_multi_element(writer, 2); |
| 661 | if (ret) { |
| 662 | ret = CMD_ERROR; |
| 663 | goto end; |
| 664 | } |
| 665 | } |
| 666 | goto end; |
| 667 | } |
| 668 | i++; |
| 669 | cmd = &actions[i]; |
| 670 | } |
| 671 | |
| 672 | ret = CMD_UNDEFINED; |
| 673 | |
| 674 | end: |
| 675 | /* Overwrite ret if an error occurred in cmd->func() */ |
| 676 | ret = command_ret ? command_ret : ret; |
| 677 | return ret; |
| 678 | } |
| 679 | /* |
| 680 | * The 'snapshot <cmd> <options>' first level command |
| 681 | */ |
| 682 | int cmd_snapshot(int argc, const char **argv) |
| 683 | { |
| 684 | int opt, ret = CMD_SUCCESS, command_ret = CMD_SUCCESS, success = 1; |
| 685 | char *session_name = NULL; |
| 686 | static poptContext pc; |
| 687 | |
| 688 | pc = poptGetContext(NULL, argc, argv, snapshot_opts, 0); |
| 689 | poptReadDefaultConfig(pc, 0); |
| 690 | |
| 691 | /* Mi check */ |
| 692 | if (lttng_opt_mi) { |
| 693 | writer = mi_lttng_writer_create(fileno(stdout), lttng_opt_mi); |
| 694 | if (!writer) { |
| 695 | ret = -LTTNG_ERR_NOMEM; |
| 696 | goto end; |
| 697 | } |
| 698 | |
| 699 | /* Open command element */ |
| 700 | ret = mi_lttng_writer_command_open(writer, |
| 701 | mi_lttng_element_command_snapshot); |
| 702 | if (ret) { |
| 703 | ret = CMD_ERROR; |
| 704 | goto end; |
| 705 | } |
| 706 | |
| 707 | /* Open output element */ |
| 708 | ret = mi_lttng_writer_open_element(writer, |
| 709 | mi_lttng_element_command_output); |
| 710 | if (ret) { |
| 711 | ret = CMD_ERROR; |
| 712 | goto end; |
| 713 | } |
| 714 | } |
| 715 | |
| 716 | while ((opt = poptGetNextOpt(pc)) != -1) { |
| 717 | switch (opt) { |
| 718 | case OPT_HELP: |
| 719 | usage(stdout); |
| 720 | goto end; |
| 721 | case OPT_LIST_OPTIONS: |
| 722 | list_cmd_options(stdout, snapshot_opts); |
| 723 | goto end; |
| 724 | case OPT_LIST_COMMANDS: |
| 725 | list_commands(actions, stdout); |
| 726 | goto end; |
| 727 | case OPT_MAX_SIZE: |
| 728 | { |
| 729 | uint64_t val; |
| 730 | const char *opt = poptGetOptArg(pc); |
| 731 | |
| 732 | if (utils_parse_size_suffix((char *) opt, &val) < 0) { |
| 733 | ERR("Unable to handle max-size value %s", opt); |
| 734 | ret = CMD_ERROR; |
| 735 | goto end; |
| 736 | } |
| 737 | |
| 738 | opt_max_size = val; |
| 739 | |
| 740 | break; |
| 741 | } |
| 742 | default: |
| 743 | usage(stderr); |
| 744 | ret = CMD_UNDEFINED; |
| 745 | goto end; |
| 746 | } |
| 747 | } |
| 748 | |
| 749 | if (!opt_session_name) { |
| 750 | session_name = get_session_name(); |
| 751 | if (session_name == NULL) { |
| 752 | ret = CMD_ERROR; |
| 753 | goto end; |
| 754 | } |
| 755 | current_session_name = session_name; |
| 756 | } else { |
| 757 | current_session_name = opt_session_name; |
| 758 | } |
| 759 | |
| 760 | command_ret = handle_command(poptGetArgs(pc)); |
| 761 | if (command_ret) { |
| 762 | switch (-command_ret) { |
| 763 | case LTTNG_ERR_EPERM: |
| 764 | ERR("The session needs to be set in no output mode (--no-output)"); |
| 765 | break; |
| 766 | case LTTNG_ERR_SNAPSHOT_NODATA: |
| 767 | WARN("%s", lttng_strerror(command_ret)); |
| 768 | break; |
| 769 | default: |
| 770 | ERR("%s", lttng_strerror(command_ret)); |
| 771 | break; |
| 772 | } |
| 773 | success = 0; |
| 774 | } |
| 775 | |
| 776 | if (lttng_opt_mi) { |
| 777 | /* Close output element */ |
| 778 | ret = mi_lttng_writer_close_element(writer); |
| 779 | if (ret) { |
| 780 | ret = CMD_ERROR; |
| 781 | goto end; |
| 782 | } |
| 783 | |
| 784 | /* Success ? */ |
| 785 | ret = mi_lttng_writer_write_element_bool(writer, |
| 786 | mi_lttng_element_command_success, success); |
| 787 | if (ret) { |
| 788 | ret = CMD_ERROR; |
| 789 | goto end; |
| 790 | } |
| 791 | |
| 792 | /* Command element close */ |
| 793 | ret = mi_lttng_writer_command_close(writer); |
| 794 | if (ret) { |
| 795 | ret = CMD_ERROR; |
| 796 | goto end; |
| 797 | } |
| 798 | } |
| 799 | |
| 800 | end: |
| 801 | /* Mi clean-up */ |
| 802 | if (writer && mi_lttng_writer_destroy(writer)) { |
| 803 | /* Preserve original error code */ |
| 804 | ret = ret ? ret : -LTTNG_ERR_MI_IO_FAIL; |
| 805 | } |
| 806 | |
| 807 | if (!opt_session_name) { |
| 808 | free(session_name); |
| 809 | } |
| 810 | |
| 811 | /* Overwrite ret if an error occured during handle_command */ |
| 812 | ret = command_ret ? command_ret : ret; |
| 813 | poptFreeContext(pc); |
| 814 | return ret; |
| 815 | } |