| 1 | /* lttctl |
| 2 | * |
| 3 | * Linux Trace Toolkit Control |
| 4 | * |
| 5 | * Small program that controls LTTng through liblttctl. |
| 6 | * |
| 7 | * Copyright 2008 FUJITSU |
| 8 | * Zhao Lei <zhaolei@cn.fujitsu.com> |
| 9 | * Gui Jianfeng <guijianfeng@cn.fujitsu.com> |
| 10 | * Copyright 2009-2010 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
| 11 | * |
| 12 | * This program is free software; you can redistribute it and/or modify |
| 13 | * it under the terms of the GNU General Public License as published by |
| 14 | * the Free Software Foundation; either version 2 of the License, or |
| 15 | * (at your option) any later version. |
| 16 | * |
| 17 | * This program is distributed in the hope that it will be useful, |
| 18 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 20 | * GNU General Public License for more details. |
| 21 | * |
| 22 | * You should have received a copy of the GNU General Public License along |
| 23 | * with this program; if not, write to the Free Software Foundation, Inc., |
| 24 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. |
| 25 | */ |
| 26 | |
| 27 | #ifdef HAVE_CONFIG_H |
| 28 | #include <config.h> |
| 29 | #endif |
| 30 | |
| 31 | #include <liblttctl/lttctl.h> |
| 32 | #include <errno.h> |
| 33 | #include <stdio.h> |
| 34 | #include <stdlib.h> |
| 35 | #include <sys/wait.h> |
| 36 | #include <unistd.h> |
| 37 | #include <string.h> |
| 38 | #include <limits.h> |
| 39 | #define _GNU_SOURCE |
| 40 | #include <getopt.h> |
| 41 | |
| 42 | #define OPT_MAX (1024) |
| 43 | #define OPT_NAMELEN (256) |
| 44 | #define OPT_VALSTRINGLEN (256) |
| 45 | |
| 46 | enum opt_type { |
| 47 | CHANNEL, |
| 48 | }; |
| 49 | |
| 50 | struct channel_option { |
| 51 | char chan_name[OPT_NAMELEN]; |
| 52 | int enable; |
| 53 | int overwrite; |
| 54 | int bufnum; |
| 55 | int bufsize; |
| 56 | int switch_timer; |
| 57 | }; |
| 58 | |
| 59 | struct lttctl_option { |
| 60 | union { |
| 61 | struct channel_option chan_opt; |
| 62 | } opt_mode; |
| 63 | enum opt_type type; |
| 64 | struct lttctl_option *next; |
| 65 | }; |
| 66 | |
| 67 | struct lttctl_option *opt_head, *last_opt; |
| 68 | |
| 69 | static int opt_create; |
| 70 | static int opt_destroy; |
| 71 | static int opt_start; |
| 72 | static int opt_pause; |
| 73 | static int opt_help; |
| 74 | static const char *opt_transport; |
| 75 | static const char *opt_write; |
| 76 | static int opt_append; |
| 77 | static unsigned int opt_dump_threads; |
| 78 | static char channel_root_default[PATH_MAX]; |
| 79 | static const char *opt_channel_root; |
| 80 | static const char *opt_tracename; |
| 81 | |
| 82 | /* Args : |
| 83 | * |
| 84 | */ |
| 85 | static void show_arguments(void) |
| 86 | { |
| 87 | printf("Linux Trace Toolkit Trace Control " VERSION"\n"); |
| 88 | printf("\n"); |
| 89 | printf("Usage: lttctl [OPTION]... [TRACENAME]\n"); |
| 90 | printf("\n"); |
| 91 | printf("Examples:\n"); |
| 92 | printf(" lttctl -c trace1 " |
| 93 | "# Create a trace named trace1.\n"); |
| 94 | printf(" lttctl -s trace1 " |
| 95 | "# start a trace named trace1.\n"); |
| 96 | printf(" lttctl -p trace1 " |
| 97 | "# pause a trace named trace1.\n"); |
| 98 | printf(" lttctl -d trace1 " |
| 99 | "# Destroy a trace named trace1.\n"); |
| 100 | printf(" lttctl -C -w /tmp/trace1 trace1 " |
| 101 | "# Create a trace named trace1, start it and\n" |
| 102 | " " |
| 103 | "# write non-overwrite channels' data to\n" |
| 104 | " " |
| 105 | "# /tmp/trace1, debugfs must be mounted for\n" |
| 106 | " " |
| 107 | "# auto-find\n"); |
| 108 | printf(" lttctl -D -w /tmp/trace1 trace1 " |
| 109 | "# Pause and destroy a trace named trace1 and\n" |
| 110 | " " |
| 111 | "# write overwrite channels' data to\n" |
| 112 | " " |
| 113 | "# /tmp/trace1, debugfs must be mounted for\n" |
| 114 | " " |
| 115 | "# auto-find\n"); |
| 116 | printf("\n"); |
| 117 | printf(" Basic options:\n"); |
| 118 | printf(" -c, --create\n"); |
| 119 | printf(" Create a trace.\n"); |
| 120 | printf(" -d, --destroy\n"); |
| 121 | printf(" Destroy a trace.\n"); |
| 122 | printf(" -s, --start\n"); |
| 123 | printf(" Start a trace.\n"); |
| 124 | printf(" -p, --pause\n"); |
| 125 | printf(" Pause a trace.\n"); |
| 126 | printf(" -h, --help\n"); |
| 127 | printf(" Show this help.\n"); |
| 128 | printf("\n"); |
| 129 | printf(" Advanced options:\n"); |
| 130 | printf(" --transport TRANSPORT\n"); |
| 131 | printf(" Set trace's transport. (ex. relay-locked or relay)\n"); |
| 132 | printf(" -o, --option OPTION\n"); |
| 133 | printf(" Set options, following operations are supported:\n"); |
| 134 | printf(" channel.<channelname>.enable=\n"); |
| 135 | printf(" channel.<channelname>.overwrite=\n"); |
| 136 | printf(" channel.<channelname>.bufnum=\n"); |
| 137 | printf(" channel.<channelname>.bufsize= (in bytes, rounded to " |
| 138 | "next power of 2)\n"); |
| 139 | printf(" <channelname> can be set to all for all channels\n"); |
| 140 | printf(" channel.<channelname>.switch_timer= (timer interval in " |
| 141 | "ms)\n"); |
| 142 | printf("\n"); |
| 143 | printf(" Integration options:\n"); |
| 144 | printf(" -C, --create_start\n"); |
| 145 | printf(" Create and start a trace.\n"); |
| 146 | printf(" -D, --pause_destroy\n"); |
| 147 | printf(" Pause and destroy a trace.\n"); |
| 148 | printf(" -w, --write PATH\n"); |
| 149 | printf(" Path for write trace datas.\n"); |
| 150 | printf(" For -c, -C, -d, -D options\n"); |
| 151 | printf(" -a, --append\n"); |
| 152 | printf(" Append to trace, For -w option\n"); |
| 153 | printf(" -n, --dump_threads NUMBER\n"); |
| 154 | printf(" Number of lttd threads, For -w option\n"); |
| 155 | printf(" --channel_root PATH\n"); |
| 156 | printf(" Set channels root path, For -w option." |
| 157 | " (ex. /mnt/debugfs/ltt)\n"); |
| 158 | printf("\n"); |
| 159 | printf(" Environment variables:\n"); |
| 160 | printf(" LTT_DAEMON\n"); |
| 161 | printf(" Complete path to the lttd binary (needs to be\n"); |
| 162 | printf(" specified if different than package build prefix).\n"); |
| 163 | printf("\n"); |
| 164 | } |
| 165 | |
| 166 | /* |
| 167 | * Separate option name to 3 fields |
| 168 | * Ex: |
| 169 | * Input: name = channel.cpu.bufsize |
| 170 | * Output: name1 = channel |
| 171 | * name2 = cpu |
| 172 | * name3 = bufsize |
| 173 | * Ret: 0 on success |
| 174 | * 1 on fail |
| 175 | * |
| 176 | * Note: |
| 177 | * Make sure that name1~3 longer than OPT_NAMELEN. |
| 178 | * name1~3 can be NULL to discard value |
| 179 | * |
| 180 | */ |
| 181 | static int separate_opt(const char *name, char *name1, char *name2, char *name3) |
| 182 | { |
| 183 | char *p; |
| 184 | |
| 185 | if (!name) |
| 186 | return 1; |
| 187 | |
| 188 | /* segment1 */ |
| 189 | p = strchr(name, '.'); |
| 190 | if (!p) |
| 191 | return 1; |
| 192 | if (p - name >= OPT_NAMELEN) |
| 193 | return 1; |
| 194 | if (name1) { |
| 195 | memcpy(name1, name, p - name); |
| 196 | name1[p - name] = 0; |
| 197 | } |
| 198 | name = p + 1; |
| 199 | |
| 200 | /* segment2 */ |
| 201 | p = strchr(name, '.'); |
| 202 | if (!p) |
| 203 | return 1; |
| 204 | if (p - name >= OPT_NAMELEN) |
| 205 | return 1; |
| 206 | if (name2) { |
| 207 | memcpy(name2, name, p - name); |
| 208 | name2[p - name] = 0; |
| 209 | } |
| 210 | name = p + 1; |
| 211 | |
| 212 | /* segment3 */ |
| 213 | if (strlen(name) >= OPT_NAMELEN) |
| 214 | return 1; |
| 215 | if (name3) |
| 216 | strcpy(name3, name); |
| 217 | |
| 218 | return 0; |
| 219 | } |
| 220 | |
| 221 | static void init_channel_opt(struct channel_option *opt, char *opt_name) |
| 222 | { |
| 223 | if (opt && opt_name) { |
| 224 | opt->enable = -1; |
| 225 | opt->overwrite = -1; |
| 226 | opt->bufnum = -1; |
| 227 | opt->bufsize = -1; |
| 228 | opt->switch_timer = -1; |
| 229 | strcpy(opt->chan_name, opt_name); |
| 230 | } |
| 231 | } |
| 232 | |
| 233 | static struct lttctl_option *find_insert_channel_opt(char *opt_name) |
| 234 | { |
| 235 | struct lttctl_option *iter, *new_opt; |
| 236 | |
| 237 | if (!opt_head) { |
| 238 | opt_head = (struct lttctl_option *)malloc(sizeof(struct lttctl_option)); |
| 239 | init_channel_opt(&opt_head->opt_mode.chan_opt, opt_name); |
| 240 | opt_head->type = CHANNEL; |
| 241 | opt_head->next = NULL; |
| 242 | last_opt = opt_head; |
| 243 | return opt_head; |
| 244 | } |
| 245 | |
| 246 | for (iter = opt_head; iter; iter = iter->next) { |
| 247 | if (iter->type != CHANNEL) |
| 248 | continue; |
| 249 | if (!strcmp(iter->opt_mode.chan_opt.chan_name, opt_name)) |
| 250 | return iter; |
| 251 | } |
| 252 | |
| 253 | new_opt = (struct lttctl_option *)malloc(sizeof(struct lttctl_option)); |
| 254 | init_channel_opt(&new_opt->opt_mode.chan_opt, opt_name); |
| 255 | new_opt->type = CHANNEL; |
| 256 | new_opt->next = NULL; |
| 257 | last_opt->next = new_opt; |
| 258 | last_opt = new_opt; |
| 259 | return new_opt; |
| 260 | } |
| 261 | |
| 262 | int set_channel_opt(struct channel_option *opt, char *opt_name, char *opt_valstr) |
| 263 | { |
| 264 | int opt_val, ret; |
| 265 | |
| 266 | if (!strcmp("enable", opt_name)) { |
| 267 | if (opt_valstr[1] != 0) { |
| 268 | return -EINVAL; |
| 269 | } |
| 270 | if (opt_valstr[0] == 'Y' || opt_valstr[0] == 'y' |
| 271 | || opt_valstr[0] == '1') |
| 272 | opt_val = 1; |
| 273 | else if (opt_valstr[0] == 'N' || opt_valstr[0] == 'n' |
| 274 | || opt_valstr[0] == '0') |
| 275 | opt_val = 0; |
| 276 | else { |
| 277 | return -EINVAL; |
| 278 | } |
| 279 | |
| 280 | opt->enable = opt_val; |
| 281 | return 0; |
| 282 | } else if (!strcmp("overwrite", opt_name)) { |
| 283 | if (opt_valstr[1] != 0) { |
| 284 | return -EINVAL; |
| 285 | } |
| 286 | if (opt_valstr[0] == 'Y' || opt_valstr[0] == 'y' |
| 287 | || opt_valstr[0] == '1') |
| 288 | opt_val = 1; |
| 289 | else if (opt_valstr[0] == 'N' || opt_valstr[0] == 'n' |
| 290 | || opt_valstr[0] == '0') |
| 291 | opt_val = 0; |
| 292 | else { |
| 293 | return -EINVAL; |
| 294 | } |
| 295 | |
| 296 | opt->overwrite = opt_val; |
| 297 | return 0; |
| 298 | |
| 299 | } else if (!strcmp("bufnum", opt_name)) { |
| 300 | ret = sscanf(opt_valstr, "%d", &opt_val); |
| 301 | if (ret != 1 || opt_val < 0) { |
| 302 | return -EINVAL; |
| 303 | } |
| 304 | |
| 305 | opt->bufnum = opt_val; |
| 306 | return 0; |
| 307 | } else if (!strcmp("bufsize", opt_name)) { |
| 308 | ret = sscanf(opt_valstr, "%d", &opt_val); |
| 309 | if (ret != 1 || opt_val < 0) { |
| 310 | return -EINVAL; |
| 311 | } |
| 312 | |
| 313 | opt->bufsize = opt_val; |
| 314 | return 0; |
| 315 | } else if (!strcmp("switch_timer", opt_name)) { |
| 316 | ret = sscanf(opt_valstr, "%d", &opt_val); |
| 317 | if (ret != 1 || opt_val < 0) { |
| 318 | return -EINVAL; |
| 319 | } |
| 320 | |
| 321 | opt->switch_timer = opt_val; |
| 322 | return 0; |
| 323 | } else { |
| 324 | return -EINVAL; |
| 325 | } |
| 326 | |
| 327 | } |
| 328 | |
| 329 | static int parst_opt(const char *optarg) |
| 330 | { |
| 331 | int ret; |
| 332 | char opt_name[OPT_NAMELEN * 3]; |
| 333 | char opt_valstr[OPT_VALSTRINGLEN]; |
| 334 | char *p; |
| 335 | |
| 336 | char name1[OPT_NAMELEN]; |
| 337 | char name2[OPT_NAMELEN]; |
| 338 | char name3[OPT_NAMELEN]; |
| 339 | |
| 340 | int opt_intval; |
| 341 | int opt_val; |
| 342 | unsigned int opt_uintval; |
| 343 | struct lttctl_option *opt; |
| 344 | |
| 345 | if (!optarg) { |
| 346 | fprintf(stderr, "Option empty\n"); |
| 347 | return -EINVAL; |
| 348 | } |
| 349 | |
| 350 | /* Get option name and val_str */ |
| 351 | p = strchr(optarg, '='); |
| 352 | if (!p) { |
| 353 | fprintf(stderr, "Option format error: %s\n", optarg); |
| 354 | return -EINVAL; |
| 355 | } |
| 356 | |
| 357 | if (p - optarg >= sizeof(opt_name)/sizeof(opt_name[0])) { |
| 358 | fprintf(stderr, "Option name too long: %s\n", optarg); |
| 359 | return -EINVAL; |
| 360 | } |
| 361 | |
| 362 | if (strlen(p+1) >= OPT_VALSTRINGLEN) { |
| 363 | fprintf(stderr, "Option value too long: %s\n", optarg); |
| 364 | return -EINVAL; |
| 365 | } |
| 366 | |
| 367 | memcpy(opt_name, optarg, p - optarg); |
| 368 | opt_name[p - optarg] = 0; |
| 369 | strcpy(opt_valstr, p+1); |
| 370 | |
| 371 | /* separate option name into 3 fields */ |
| 372 | ret = separate_opt(opt_name, name1, name2, name3); |
| 373 | if (ret != 0) { |
| 374 | fprintf(stderr, "Option name error1: %s\n", optarg); |
| 375 | return -EINVAL; |
| 376 | } |
| 377 | |
| 378 | if (!strcmp("channel", name1)) { |
| 379 | opt = find_insert_channel_opt(name2); |
| 380 | if ((ret = set_channel_opt(&opt->opt_mode.chan_opt, |
| 381 | name3, opt_valstr) != 0)) { |
| 382 | fprintf(stderr, "Option name error2: %s\n", optarg); |
| 383 | return ret; |
| 384 | } |
| 385 | } else { |
| 386 | fprintf(stderr, "Option name error3: %s\n", optarg); |
| 387 | return -EINVAL; |
| 388 | } |
| 389 | |
| 390 | return 0; |
| 391 | } |
| 392 | |
| 393 | /* parse_arguments |
| 394 | * |
| 395 | * Parses the command line arguments. |
| 396 | * |
| 397 | * Returns -1 if the arguments were correct, but doesn't ask for program |
| 398 | * continuation. Returns EINVAL if the arguments are incorrect, or 0 if OK. |
| 399 | */ |
| 400 | static int parse_arguments(int argc, char **argv) |
| 401 | { |
| 402 | int ret = 0; |
| 403 | |
| 404 | static struct option longopts[] = { |
| 405 | {"create", no_argument, NULL, 'c'}, |
| 406 | {"destroy", no_argument, NULL, 'd'}, |
| 407 | {"start", no_argument, NULL, 's'}, |
| 408 | {"pause", no_argument, NULL, 'p'}, |
| 409 | {"help", no_argument, NULL, 'h'}, |
| 410 | {"transport", required_argument, NULL, 2}, |
| 411 | {"option", required_argument, NULL, 'o'}, |
| 412 | {"create_start", no_argument, NULL, 'C'}, |
| 413 | {"pause_destroy", no_argument, NULL, 'D'}, |
| 414 | {"write", required_argument, NULL, 'w'}, |
| 415 | {"append", no_argument, NULL, 'a'}, |
| 416 | {"dump_threads", required_argument, NULL, 'n'}, |
| 417 | {"channel_root", required_argument, NULL, 3}, |
| 418 | { NULL, 0, NULL, 0 }, |
| 419 | }; |
| 420 | |
| 421 | /* |
| 422 | * Enable all channels in default |
| 423 | * To make novice users happy |
| 424 | */ |
| 425 | parst_opt("channel.all.enable=1"); |
| 426 | |
| 427 | opterr = 1; /* Print error message on getopt_long */ |
| 428 | while (1) { |
| 429 | int c; |
| 430 | c = getopt_long(argc, argv, "cdspho:CDw:an:", longopts, NULL); |
| 431 | if (-1 == c) { |
| 432 | /* parse end */ |
| 433 | break; |
| 434 | } |
| 435 | switch (c) { |
| 436 | case 'c': |
| 437 | opt_create = 1; |
| 438 | break; |
| 439 | case 'd': |
| 440 | opt_destroy = 1; |
| 441 | break; |
| 442 | case 's': |
| 443 | opt_start = 1; |
| 444 | break; |
| 445 | case 'p': |
| 446 | opt_pause = 1; |
| 447 | break; |
| 448 | case 'h': |
| 449 | opt_help = 1; |
| 450 | break; |
| 451 | case 2: |
| 452 | if (!opt_transport) { |
| 453 | opt_transport = optarg; |
| 454 | } else { |
| 455 | fprintf(stderr, |
| 456 | "Please specify only 1 transport\n"); |
| 457 | return -EINVAL; |
| 458 | } |
| 459 | break; |
| 460 | case 'o': |
| 461 | ret = parst_opt(optarg); |
| 462 | if (ret) |
| 463 | return ret; |
| 464 | break; |
| 465 | case 'C': |
| 466 | opt_create = 1; |
| 467 | opt_start = 1; |
| 468 | break; |
| 469 | case 'D': |
| 470 | opt_pause = 1; |
| 471 | opt_destroy = 1; |
| 472 | break; |
| 473 | case 'w': |
| 474 | if (!opt_write) { |
| 475 | opt_write = optarg; |
| 476 | } else { |
| 477 | fprintf(stderr, |
| 478 | "Please specify only 1 write dir\n"); |
| 479 | return -EINVAL; |
| 480 | } |
| 481 | break; |
| 482 | case 'a': |
| 483 | opt_append = 1; |
| 484 | break; |
| 485 | case 'n': |
| 486 | if (opt_dump_threads) { |
| 487 | fprintf(stderr, |
| 488 | "Please specify only 1 dump threads\n"); |
| 489 | return -EINVAL; |
| 490 | } |
| 491 | |
| 492 | ret = sscanf(optarg, "%u", &opt_dump_threads); |
| 493 | if (ret != 1) { |
| 494 | fprintf(stderr, |
| 495 | "Dump threads not positive number\n"); |
| 496 | return -EINVAL; |
| 497 | } |
| 498 | break; |
| 499 | case 3: |
| 500 | if (!opt_channel_root) { |
| 501 | opt_channel_root = optarg; |
| 502 | } else { |
| 503 | fprintf(stderr, |
| 504 | "Please specify only 1 channel root\n"); |
| 505 | return -EINVAL; |
| 506 | } |
| 507 | break; |
| 508 | case '?': |
| 509 | return -EINVAL; |
| 510 | default: |
| 511 | break; |
| 512 | }; |
| 513 | }; |
| 514 | |
| 515 | /* Don't check args when user needs help */ |
| 516 | if (opt_help) |
| 517 | return 0; |
| 518 | |
| 519 | /* Get tracename */ |
| 520 | if (optind < argc - 1) { |
| 521 | fprintf(stderr, "Please specify only 1 trace name\n"); |
| 522 | return -EINVAL; |
| 523 | } |
| 524 | if (optind > argc - 1) { |
| 525 | fprintf(stderr, "Please specify trace name\n"); |
| 526 | return -EINVAL; |
| 527 | } |
| 528 | opt_tracename = argv[optind]; |
| 529 | |
| 530 | /* |
| 531 | * Check arguments |
| 532 | */ |
| 533 | if (!opt_create && !opt_start && !opt_destroy && !opt_pause) { |
| 534 | fprintf(stderr, |
| 535 | "Please specify a option of " |
| 536 | "create, destroy, start, or pause\n"); |
| 537 | return -EINVAL; |
| 538 | } |
| 539 | |
| 540 | if ((opt_create || opt_start) && (opt_destroy || opt_pause)) { |
| 541 | fprintf(stderr, |
| 542 | "Create and start conflict with destroy and pause\n"); |
| 543 | return -EINVAL; |
| 544 | } |
| 545 | |
| 546 | if (opt_create) { |
| 547 | if (!opt_transport) |
| 548 | opt_transport = "relay"; |
| 549 | } |
| 550 | |
| 551 | if (opt_transport) { |
| 552 | if (!opt_create) { |
| 553 | fprintf(stderr, |
| 554 | "Transport option must be combine with create" |
| 555 | " option\n"); |
| 556 | return -EINVAL; |
| 557 | } |
| 558 | } |
| 559 | |
| 560 | if (opt_write) { |
| 561 | if (!opt_create && !opt_destroy) { |
| 562 | fprintf(stderr, |
| 563 | "Write option must be combine with create or" |
| 564 | " destroy option\n"); |
| 565 | return -EINVAL; |
| 566 | } |
| 567 | |
| 568 | if (!opt_channel_root) |
| 569 | if (getdebugfsmntdir(channel_root_default) == 0) { |
| 570 | strcat(channel_root_default, "/ltt"); |
| 571 | opt_channel_root = channel_root_default; |
| 572 | } else { |
| 573 | fprintf(stderr, |
| 574 | "Channel_root is necessary for -w" |
| 575 | " option, but neither --channel_root" |
| 576 | " option\n" |
| 577 | "specified, nor debugfs's mount dir" |
| 578 | " found, mount debugfs also failed\n"); |
| 579 | return -EINVAL; |
| 580 | } |
| 581 | |
| 582 | if (opt_dump_threads == 0) |
| 583 | opt_dump_threads = 1; |
| 584 | } |
| 585 | |
| 586 | if (opt_append) { |
| 587 | if (!opt_write) { |
| 588 | fprintf(stderr, |
| 589 | "Append option must be combine with write" |
| 590 | " option\n"); |
| 591 | return -EINVAL; |
| 592 | } |
| 593 | } |
| 594 | |
| 595 | if (opt_dump_threads) { |
| 596 | if (!opt_write) { |
| 597 | fprintf(stderr, |
| 598 | "Dump_threads option must be combine with write" |
| 599 | " option\n"); |
| 600 | return -EINVAL; |
| 601 | } |
| 602 | } |
| 603 | |
| 604 | if (opt_channel_root) { |
| 605 | if (!opt_write) { |
| 606 | fprintf(stderr, |
| 607 | "Channel_root option must be combine with write" |
| 608 | " option\n"); |
| 609 | return -EINVAL; |
| 610 | } |
| 611 | } |
| 612 | |
| 613 | return 0; |
| 614 | } |
| 615 | |
| 616 | static void show_info(void) |
| 617 | { |
| 618 | printf("Linux Trace Toolkit Trace Control " VERSION"\n"); |
| 619 | printf("\n"); |
| 620 | if (opt_tracename != NULL) { |
| 621 | printf("Controlling trace : %s\n", opt_tracename); |
| 622 | printf("\n"); |
| 623 | } |
| 624 | } |
| 625 | |
| 626 | static int lttctl_channel_setup(struct channel_option *opt) |
| 627 | { |
| 628 | int ret; |
| 629 | |
| 630 | if (opt->enable != -1) { |
| 631 | if ((ret = lttctl_set_channel_enable(opt_tracename, |
| 632 | opt->chan_name, |
| 633 | opt->enable)) != 0) |
| 634 | return ret; |
| 635 | } |
| 636 | if (opt->overwrite != -1) { |
| 637 | if ((ret = lttctl_set_channel_overwrite(opt_tracename, |
| 638 | opt->chan_name, |
| 639 | opt->overwrite)) != 0) |
| 640 | return ret; |
| 641 | } |
| 642 | if (opt->bufnum != -1) { |
| 643 | if ((ret = lttctl_set_channel_subbuf_num(opt_tracename, |
| 644 | opt->chan_name, |
| 645 | opt->bufnum)) != 0) |
| 646 | return ret; |
| 647 | } |
| 648 | if (opt->bufsize != -1) { |
| 649 | if ((ret = lttctl_set_channel_subbuf_size(opt_tracename, |
| 650 | opt->chan_name, |
| 651 | opt->bufsize)) != 0) |
| 652 | return ret; |
| 653 | } |
| 654 | if (opt->switch_timer != -1) { |
| 655 | if ((ret = lttctl_set_channel_switch_timer(opt_tracename, |
| 656 | opt->chan_name, opt->switch_timer)) != 0) |
| 657 | return ret; |
| 658 | } |
| 659 | |
| 660 | return 0; |
| 661 | } |
| 662 | |
| 663 | static int lttctl_create_trace(void) |
| 664 | { |
| 665 | int ret; |
| 666 | int i; |
| 667 | struct lttctl_option *opt; |
| 668 | |
| 669 | ret = lttctl_setup_trace(opt_tracename); |
| 670 | if (ret) |
| 671 | goto setup_trace_fail; |
| 672 | |
| 673 | for (opt = opt_head; opt; opt = opt->next) { |
| 674 | if (opt->type != CHANNEL) |
| 675 | continue; |
| 676 | ret = lttctl_channel_setup(&opt->opt_mode.chan_opt); |
| 677 | if (ret) |
| 678 | goto set_option_fail;; |
| 679 | } |
| 680 | |
| 681 | ret = lttctl_set_trans(opt_tracename, opt_transport); |
| 682 | if (ret) |
| 683 | goto set_option_fail; |
| 684 | |
| 685 | ret = lttctl_alloc_trace(opt_tracename); |
| 686 | if (ret) |
| 687 | goto alloc_trace_fail; |
| 688 | |
| 689 | return 0; |
| 690 | |
| 691 | alloc_trace_fail: |
| 692 | set_option_fail: |
| 693 | lttctl_destroy_trace(opt_tracename); |
| 694 | setup_trace_fail: |
| 695 | return ret; |
| 696 | } |
| 697 | |
| 698 | /* |
| 699 | * Start a lttd daemon to write trace data |
| 700 | * Dump overwrite channels on overwrite!=0 |
| 701 | * Dump normal(non-overwrite) channels on overwrite=0 |
| 702 | * |
| 703 | * When called for overwrite mode, wait for lttd to return, so we are sure that |
| 704 | * trace session teardown is not executed before lttd can grab the buffer data. |
| 705 | * |
| 706 | * ret: 0 on success |
| 707 | * !0 on fail |
| 708 | */ |
| 709 | static int lttctl_daemon(int overwrite) |
| 710 | { |
| 711 | pid_t pid; |
| 712 | int status; |
| 713 | |
| 714 | pid = fork(); |
| 715 | if (pid < 0) { |
| 716 | perror("Error in forking for lttd daemon"); |
| 717 | return errno; |
| 718 | } |
| 719 | |
| 720 | if (pid == 0) { |
| 721 | /* child */ |
| 722 | char *argv[16]; |
| 723 | int argc = 0; |
| 724 | char channel_path[PATH_MAX]; |
| 725 | char thread_num[16]; |
| 726 | |
| 727 | /* prog path */ |
| 728 | argv[argc] = getenv("LTT_DAEMON"); |
| 729 | if (argv[argc] == NULL) |
| 730 | argv[argc] = PACKAGE_BIN_DIR "/lttd"; |
| 731 | argc++; |
| 732 | |
| 733 | /* -t option */ |
| 734 | argv[argc] = "-t"; |
| 735 | argc++; |
| 736 | /* |
| 737 | * we allow modify of opt_write's content in new process |
| 738 | * for get rid of warning of assign char * to const char * |
| 739 | */ |
| 740 | argv[argc] = (char *)opt_write; |
| 741 | argc++; |
| 742 | |
| 743 | /* -c option */ |
| 744 | strcpy(channel_path, opt_channel_root); |
| 745 | strcat(channel_path, "/"); |
| 746 | strcat(channel_path, opt_tracename); |
| 747 | argv[argc] = "-c"; |
| 748 | argc++; |
| 749 | argv[argc] = channel_path; |
| 750 | argc++; |
| 751 | |
| 752 | /* -N option */ |
| 753 | sprintf(thread_num, "%u", opt_dump_threads); |
| 754 | argv[argc] = "-N"; |
| 755 | argc++; |
| 756 | argv[argc] = thread_num; |
| 757 | argc++; |
| 758 | |
| 759 | /* -a option */ |
| 760 | if (opt_append) { |
| 761 | argv[argc] = "-a"; |
| 762 | argc++; |
| 763 | } |
| 764 | |
| 765 | /* -d option */ |
| 766 | argv[argc] = "-d"; |
| 767 | argc++; |
| 768 | |
| 769 | /* overwrite option */ |
| 770 | if (overwrite) { |
| 771 | argv[argc] = "-f"; |
| 772 | argc++; |
| 773 | } else { |
| 774 | argv[argc] = "-n"; |
| 775 | argc++; |
| 776 | } |
| 777 | |
| 778 | argv[argc] = NULL; |
| 779 | |
| 780 | execvp(argv[0], argv); |
| 781 | |
| 782 | perror("Error in executing the lttd daemon"); |
| 783 | exit(errno); |
| 784 | } |
| 785 | |
| 786 | /* parent */ |
| 787 | if (waitpid(pid, &status, 0) == -1) { |
| 788 | perror("Error in waitpid\n"); |
| 789 | return errno; |
| 790 | } |
| 791 | |
| 792 | if (!WIFEXITED(status)) { |
| 793 | fprintf(stderr, "lttd process interrupted\n"); |
| 794 | return status; |
| 795 | } |
| 796 | |
| 797 | if (WEXITSTATUS(status)) |
| 798 | fprintf(stderr, "lttd process running failed\n"); |
| 799 | |
| 800 | /* |
| 801 | * FIXME |
| 802 | * This is a temporary hack to ensure that the lttd daemon grabs |
| 803 | * handles on the debugfs buffer files before we destroy the trace |
| 804 | * session. Properly handling this will imply separating the "flush" |
| 805 | * from the "destroy" operation at kernel-level in LTTng. |
| 806 | */ |
| 807 | if (overwrite) |
| 808 | sleep(2); |
| 809 | |
| 810 | return WEXITSTATUS(status); |
| 811 | } |
| 812 | |
| 813 | int main(int argc, char **argv) |
| 814 | { |
| 815 | int ret; |
| 816 | |
| 817 | ret = parse_arguments(argc, argv); |
| 818 | /* If user needs show help, we disregard other options */ |
| 819 | if (opt_help) { |
| 820 | show_arguments(); |
| 821 | return 0; |
| 822 | } |
| 823 | |
| 824 | /* exit program if arguments wrong */ |
| 825 | if (ret) |
| 826 | return 1; |
| 827 | |
| 828 | show_info(); |
| 829 | |
| 830 | ret = lttctl_init(); |
| 831 | if (ret != 0) |
| 832 | return ret; |
| 833 | |
| 834 | if (opt_create) { |
| 835 | printf("lttctl: Creating trace\n"); |
| 836 | ret = lttctl_create_trace(); |
| 837 | if (ret) |
| 838 | goto op_fail; |
| 839 | |
| 840 | if (opt_write) { |
| 841 | printf("lttctl: Forking lttd\n"); |
| 842 | ret = lttctl_daemon(0); |
| 843 | if (ret) |
| 844 | goto op_fail; |
| 845 | } |
| 846 | } |
| 847 | |
| 848 | if (opt_start) { |
| 849 | printf("lttctl: Starting trace\n"); |
| 850 | ret = lttctl_start(opt_tracename); |
| 851 | if (ret) |
| 852 | goto op_fail; |
| 853 | } |
| 854 | |
| 855 | if (opt_pause) { |
| 856 | printf("lttctl: Pausing trace\n"); |
| 857 | ret = lttctl_pause(opt_tracename); |
| 858 | if (ret) |
| 859 | goto op_fail; |
| 860 | } |
| 861 | |
| 862 | if (opt_destroy) { |
| 863 | if (opt_write) { |
| 864 | printf("lttctl: Forking lttd\n"); |
| 865 | ret = lttctl_daemon(1); |
| 866 | if (ret) |
| 867 | goto op_fail; |
| 868 | } |
| 869 | |
| 870 | printf("lttctl: Destroying trace\n"); |
| 871 | ret = lttctl_destroy_trace(opt_tracename); |
| 872 | if (ret) |
| 873 | goto op_fail; |
| 874 | } |
| 875 | |
| 876 | op_fail: |
| 877 | lttctl_destroy(); |
| 878 | |
| 879 | return ret; |
| 880 | } |