| 1 | /* |
| 2 | * SPDX-License-Identifier: LGPL-2.1-or-later |
| 3 | * |
| 4 | * Copyright (C) 2013 Paul Woegerer <paul_woegerer@mentor.com> |
| 5 | * Copyright (C) 2015 Antoine Busque <abusque@efficios.com> |
| 6 | * Copyright (C) 2016 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
| 7 | */ |
| 8 | |
| 9 | #define _LGPL_SOURCE |
| 10 | #include <link.h> |
| 11 | #include <limits.h> |
| 12 | #include <stdio.h> |
| 13 | #include <stdint.h> |
| 14 | #include <stdlib.h> |
| 15 | #include <stdbool.h> |
| 16 | #include <sys/types.h> |
| 17 | #include <unistd.h> |
| 18 | |
| 19 | #include "common/elf.h" |
| 20 | #include "common/macros.h" |
| 21 | #include "lttng-tracer-core.h" |
| 22 | #include "lttng-ust-statedump.h" |
| 23 | #include "common/jhash.h" |
| 24 | #include "common/getenv.h" |
| 25 | #include "lib/lttng-ust/events.h" |
| 26 | |
| 27 | #define LTTNG_UST_TRACEPOINT_HIDDEN_DEFINITION |
| 28 | #define LTTNG_UST_TRACEPOINT_PROVIDER_HIDDEN_DEFINITION |
| 29 | |
| 30 | #define LTTNG_UST_TRACEPOINT_DEFINE |
| 31 | #include "ust_lib.h" /* Only define. */ |
| 32 | |
| 33 | #define LTTNG_UST_TRACEPOINT_CREATE_PROBES |
| 34 | #define LTTNG_UST_TP_SESSION_CHECK |
| 35 | #include "lttng-ust-statedump-provider.h" /* Define and create probes. */ |
| 36 | |
| 37 | struct dl_iterate_data { |
| 38 | int exec_found; |
| 39 | bool first; |
| 40 | bool cancel; |
| 41 | }; |
| 42 | |
| 43 | struct bin_info_data { |
| 44 | void *base_addr_ptr; |
| 45 | char resolved_path[PATH_MAX]; |
| 46 | char *dbg_file; |
| 47 | uint8_t *build_id; |
| 48 | uint64_t memsz; |
| 49 | size_t build_id_len; |
| 50 | int vdso; |
| 51 | uint32_t crc; |
| 52 | uint8_t is_pic; |
| 53 | uint8_t has_build_id; |
| 54 | uint8_t has_debug_link; |
| 55 | }; |
| 56 | |
| 57 | struct lttng_ust_dl_node { |
| 58 | struct bin_info_data bin_data; |
| 59 | struct cds_hlist_node node; |
| 60 | bool traced; |
| 61 | bool marked; |
| 62 | }; |
| 63 | |
| 64 | #define UST_DL_STATE_HASH_BITS 8 |
| 65 | #define UST_DL_STATE_TABLE_SIZE (1 << UST_DL_STATE_HASH_BITS) |
| 66 | static struct cds_hlist_head dl_state_table[UST_DL_STATE_TABLE_SIZE]; |
| 67 | |
| 68 | typedef void (*tracepoint_cb)(struct lttng_ust_session *session, void *priv); |
| 69 | |
| 70 | static |
| 71 | struct lttng_ust_dl_node *alloc_dl_node(const struct bin_info_data *bin_data) |
| 72 | { |
| 73 | struct lttng_ust_dl_node *e; |
| 74 | |
| 75 | e = zmalloc(sizeof(struct lttng_ust_dl_node)); |
| 76 | if (!e) |
| 77 | return NULL; |
| 78 | if (bin_data->dbg_file) { |
| 79 | e->bin_data.dbg_file = strdup(bin_data->dbg_file); |
| 80 | if (!e->bin_data.dbg_file) |
| 81 | goto error; |
| 82 | } |
| 83 | if (bin_data->build_id) { |
| 84 | e->bin_data.build_id = zmalloc(bin_data->build_id_len); |
| 85 | if (!e->bin_data.build_id) |
| 86 | goto error; |
| 87 | memcpy(e->bin_data.build_id, bin_data->build_id, |
| 88 | bin_data->build_id_len); |
| 89 | } |
| 90 | e->bin_data.base_addr_ptr = bin_data->base_addr_ptr; |
| 91 | memcpy(e->bin_data.resolved_path, bin_data->resolved_path, PATH_MAX); |
| 92 | e->bin_data.memsz = bin_data->memsz; |
| 93 | e->bin_data.build_id_len = bin_data->build_id_len; |
| 94 | e->bin_data.vdso = bin_data->vdso; |
| 95 | e->bin_data.crc = bin_data->crc; |
| 96 | e->bin_data.is_pic = bin_data->is_pic; |
| 97 | e->bin_data.has_build_id = bin_data->has_build_id; |
| 98 | e->bin_data.has_debug_link = bin_data->has_debug_link; |
| 99 | return e; |
| 100 | |
| 101 | error: |
| 102 | free(e->bin_data.build_id); |
| 103 | free(e->bin_data.dbg_file); |
| 104 | free(e); |
| 105 | return NULL; |
| 106 | } |
| 107 | |
| 108 | static |
| 109 | void free_dl_node(struct lttng_ust_dl_node *e) |
| 110 | { |
| 111 | free(e->bin_data.build_id); |
| 112 | free(e->bin_data.dbg_file); |
| 113 | free(e); |
| 114 | } |
| 115 | |
| 116 | /* Return 0 if same, nonzero if not. */ |
| 117 | static |
| 118 | int compare_bin_data(const struct bin_info_data *a, |
| 119 | const struct bin_info_data *b) |
| 120 | { |
| 121 | if (a->base_addr_ptr != b->base_addr_ptr) |
| 122 | return -1; |
| 123 | if (strcmp(a->resolved_path, b->resolved_path) != 0) |
| 124 | return -1; |
| 125 | if (a->dbg_file && !b->dbg_file) |
| 126 | return -1; |
| 127 | if (!a->dbg_file && b->dbg_file) |
| 128 | return -1; |
| 129 | if (a->dbg_file && strcmp(a->dbg_file, b->dbg_file) != 0) |
| 130 | return -1; |
| 131 | if (a->build_id && !b->build_id) |
| 132 | return -1; |
| 133 | if (!a->build_id && b->build_id) |
| 134 | return -1; |
| 135 | if (a->build_id_len != b->build_id_len) |
| 136 | return -1; |
| 137 | if (a->build_id && |
| 138 | memcmp(a->build_id, b->build_id, a->build_id_len) != 0) |
| 139 | return -1; |
| 140 | if (a->memsz != b->memsz) |
| 141 | return -1; |
| 142 | if (a->vdso != b->vdso) |
| 143 | return -1; |
| 144 | if (a->crc != b->crc) |
| 145 | return -1; |
| 146 | if (a->is_pic != b->is_pic) |
| 147 | return -1; |
| 148 | if (a->has_build_id != b->has_build_id) |
| 149 | return -1; |
| 150 | if (a->has_debug_link != b->has_debug_link) |
| 151 | return -1; |
| 152 | return 0; |
| 153 | } |
| 154 | |
| 155 | static |
| 156 | struct lttng_ust_dl_node *find_or_create_dl_node(struct bin_info_data *bin_data) |
| 157 | { |
| 158 | struct cds_hlist_head *head; |
| 159 | struct lttng_ust_dl_node *e; |
| 160 | unsigned int hash; |
| 161 | bool found = false; |
| 162 | |
| 163 | hash = jhash(&bin_data->base_addr_ptr, |
| 164 | sizeof(bin_data->base_addr_ptr), 0); |
| 165 | head = &dl_state_table[hash & (UST_DL_STATE_TABLE_SIZE - 1)]; |
| 166 | cds_hlist_for_each_entry_2(e, head, node) { |
| 167 | if (compare_bin_data(&e->bin_data, bin_data) != 0) |
| 168 | continue; |
| 169 | found = true; |
| 170 | break; |
| 171 | } |
| 172 | if (!found) { |
| 173 | /* Create */ |
| 174 | e = alloc_dl_node(bin_data); |
| 175 | if (!e) |
| 176 | return NULL; |
| 177 | cds_hlist_add_head(&e->node, head); |
| 178 | } |
| 179 | return e; |
| 180 | } |
| 181 | |
| 182 | static |
| 183 | void remove_dl_node(struct lttng_ust_dl_node *e) |
| 184 | { |
| 185 | cds_hlist_del(&e->node); |
| 186 | } |
| 187 | |
| 188 | /* |
| 189 | * Trace statedump event into all sessions owned by the caller thread |
| 190 | * for which statedump is pending. |
| 191 | */ |
| 192 | static |
| 193 | void trace_statedump_event(tracepoint_cb tp_cb, void *owner, void *priv) |
| 194 | { |
| 195 | struct cds_list_head *sessionsp; |
| 196 | struct lttng_ust_session_private *session_priv; |
| 197 | |
| 198 | sessionsp = lttng_get_sessions(); |
| 199 | cds_list_for_each_entry(session_priv, sessionsp, node) { |
| 200 | if (session_priv->owner != owner) |
| 201 | continue; |
| 202 | if (!session_priv->statedump_pending) |
| 203 | continue; |
| 204 | tp_cb(session_priv->pub, priv); |
| 205 | } |
| 206 | } |
| 207 | |
| 208 | static |
| 209 | void trace_bin_info_cb(struct lttng_ust_session *session, void *priv) |
| 210 | { |
| 211 | struct bin_info_data *bin_data = (struct bin_info_data *) priv; |
| 212 | |
| 213 | lttng_ust_tracepoint(lttng_ust_statedump, bin_info, |
| 214 | session, bin_data->base_addr_ptr, |
| 215 | bin_data->resolved_path, bin_data->memsz, |
| 216 | bin_data->is_pic, bin_data->has_build_id, |
| 217 | bin_data->has_debug_link); |
| 218 | } |
| 219 | |
| 220 | static |
| 221 | void trace_build_id_cb(struct lttng_ust_session *session, void *priv) |
| 222 | { |
| 223 | struct bin_info_data *bin_data = (struct bin_info_data *) priv; |
| 224 | |
| 225 | lttng_ust_tracepoint(lttng_ust_statedump, build_id, |
| 226 | session, bin_data->base_addr_ptr, |
| 227 | bin_data->build_id, bin_data->build_id_len); |
| 228 | } |
| 229 | |
| 230 | static |
| 231 | void trace_debug_link_cb(struct lttng_ust_session *session, void *priv) |
| 232 | { |
| 233 | struct bin_info_data *bin_data = (struct bin_info_data *) priv; |
| 234 | |
| 235 | lttng_ust_tracepoint(lttng_ust_statedump, debug_link, |
| 236 | session, bin_data->base_addr_ptr, |
| 237 | bin_data->dbg_file, bin_data->crc); |
| 238 | } |
| 239 | |
| 240 | static |
| 241 | void procname_cb(struct lttng_ust_session *session, void *priv) |
| 242 | { |
| 243 | char *procname = (char *) priv; |
| 244 | lttng_ust_tracepoint(lttng_ust_statedump, procname, session, procname); |
| 245 | } |
| 246 | |
| 247 | static |
| 248 | void trace_start_cb(struct lttng_ust_session *session, void *priv __attribute__((unused))) |
| 249 | { |
| 250 | lttng_ust_tracepoint(lttng_ust_statedump, start, session); |
| 251 | } |
| 252 | |
| 253 | static |
| 254 | void trace_end_cb(struct lttng_ust_session *session, void *priv __attribute__((unused))) |
| 255 | { |
| 256 | lttng_ust_tracepoint(lttng_ust_statedump, end, session); |
| 257 | } |
| 258 | |
| 259 | static |
| 260 | int get_elf_info(struct bin_info_data *bin_data) |
| 261 | { |
| 262 | struct lttng_ust_elf *elf; |
| 263 | int ret = 0, found; |
| 264 | |
| 265 | elf = lttng_ust_elf_create(bin_data->resolved_path); |
| 266 | if (!elf) { |
| 267 | ret = -1; |
| 268 | goto end; |
| 269 | } |
| 270 | |
| 271 | ret = lttng_ust_elf_get_memsz(elf, &bin_data->memsz); |
| 272 | if (ret) { |
| 273 | goto end; |
| 274 | } |
| 275 | |
| 276 | found = 0; |
| 277 | ret = lttng_ust_elf_get_build_id(elf, &bin_data->build_id, |
| 278 | &bin_data->build_id_len, |
| 279 | &found); |
| 280 | if (ret) { |
| 281 | goto end; |
| 282 | } |
| 283 | bin_data->has_build_id = !!found; |
| 284 | found = 0; |
| 285 | ret = lttng_ust_elf_get_debug_link(elf, &bin_data->dbg_file, |
| 286 | &bin_data->crc, |
| 287 | &found); |
| 288 | if (ret) { |
| 289 | goto end; |
| 290 | } |
| 291 | bin_data->has_debug_link = !!found; |
| 292 | |
| 293 | bin_data->is_pic = lttng_ust_elf_is_pic(elf); |
| 294 | |
| 295 | end: |
| 296 | lttng_ust_elf_destroy(elf); |
| 297 | return ret; |
| 298 | } |
| 299 | |
| 300 | static |
| 301 | void trace_baddr(struct bin_info_data *bin_data, void *owner) |
| 302 | { |
| 303 | trace_statedump_event(trace_bin_info_cb, owner, bin_data); |
| 304 | |
| 305 | if (bin_data->has_build_id) |
| 306 | trace_statedump_event(trace_build_id_cb, owner, bin_data); |
| 307 | |
| 308 | if (bin_data->has_debug_link) |
| 309 | trace_statedump_event(trace_debug_link_cb, owner, bin_data); |
| 310 | } |
| 311 | |
| 312 | static |
| 313 | int extract_baddr(struct bin_info_data *bin_data) |
| 314 | { |
| 315 | int ret = 0; |
| 316 | struct lttng_ust_dl_node *e; |
| 317 | |
| 318 | if (!bin_data->vdso) { |
| 319 | ret = get_elf_info(bin_data); |
| 320 | if (ret) { |
| 321 | goto end; |
| 322 | } |
| 323 | } else { |
| 324 | bin_data->memsz = 0; |
| 325 | bin_data->has_build_id = 0; |
| 326 | bin_data->has_debug_link = 0; |
| 327 | } |
| 328 | |
| 329 | e = find_or_create_dl_node(bin_data); |
| 330 | if (!e) { |
| 331 | ret = -1; |
| 332 | goto end; |
| 333 | } |
| 334 | e->marked = true; |
| 335 | end: |
| 336 | free(bin_data->build_id); |
| 337 | bin_data->build_id = NULL; |
| 338 | free(bin_data->dbg_file); |
| 339 | bin_data->dbg_file = NULL; |
| 340 | return ret; |
| 341 | } |
| 342 | |
| 343 | static |
| 344 | void trace_statedump_start(void *owner) |
| 345 | { |
| 346 | trace_statedump_event(trace_start_cb, owner, NULL); |
| 347 | } |
| 348 | |
| 349 | static |
| 350 | void trace_statedump_end(void *owner) |
| 351 | { |
| 352 | trace_statedump_event(trace_end_cb, owner, NULL); |
| 353 | } |
| 354 | |
| 355 | static |
| 356 | void iter_begin(struct dl_iterate_data *data) |
| 357 | { |
| 358 | unsigned int i; |
| 359 | |
| 360 | /* |
| 361 | * UST lock nests within dynamic loader lock. |
| 362 | * |
| 363 | * Hold this lock across handling of the module listing to |
| 364 | * protect memory allocation at early process start, due to |
| 365 | * interactions with libc-wrapper lttng malloc instrumentation. |
| 366 | */ |
| 367 | if (ust_lock()) { |
| 368 | data->cancel = true; |
| 369 | return; |
| 370 | } |
| 371 | |
| 372 | /* Ensure all entries are unmarked. */ |
| 373 | for (i = 0; i < UST_DL_STATE_TABLE_SIZE; i++) { |
| 374 | struct cds_hlist_head *head; |
| 375 | struct lttng_ust_dl_node *e; |
| 376 | |
| 377 | head = &dl_state_table[i]; |
| 378 | cds_hlist_for_each_entry_2(e, head, node) |
| 379 | assert(!e->marked); |
| 380 | } |
| 381 | } |
| 382 | |
| 383 | static |
| 384 | void trace_lib_load(const struct bin_info_data *bin_data, void *ip) |
| 385 | { |
| 386 | lttng_ust_tracepoint(lttng_ust_lib, load, |
| 387 | ip, bin_data->base_addr_ptr, bin_data->resolved_path, |
| 388 | bin_data->memsz, bin_data->has_build_id, |
| 389 | bin_data->has_debug_link); |
| 390 | |
| 391 | if (bin_data->has_build_id) { |
| 392 | lttng_ust_tracepoint(lttng_ust_lib, build_id, |
| 393 | ip, bin_data->base_addr_ptr, bin_data->build_id, |
| 394 | bin_data->build_id_len); |
| 395 | } |
| 396 | |
| 397 | if (bin_data->has_debug_link) { |
| 398 | lttng_ust_tracepoint(lttng_ust_lib, debug_link, |
| 399 | ip, bin_data->base_addr_ptr, bin_data->dbg_file, |
| 400 | bin_data->crc); |
| 401 | } |
| 402 | } |
| 403 | |
| 404 | static |
| 405 | void trace_lib_unload(const struct bin_info_data *bin_data, void *ip) |
| 406 | { |
| 407 | lttng_ust_tracepoint(lttng_ust_lib, unload, ip, bin_data->base_addr_ptr); |
| 408 | } |
| 409 | |
| 410 | static |
| 411 | void iter_end(struct dl_iterate_data *data, void *ip) |
| 412 | { |
| 413 | unsigned int i; |
| 414 | |
| 415 | if (data->cancel) |
| 416 | goto end; |
| 417 | /* |
| 418 | * Iterate on hash table. |
| 419 | * For each marked, traced, do nothing. |
| 420 | * For each marked, not traced, trace lib open event. traced = true. |
| 421 | * For each unmarked, traced, trace lib close event. remove node. |
| 422 | * For each unmarked, not traced, remove node. |
| 423 | */ |
| 424 | for (i = 0; i < UST_DL_STATE_TABLE_SIZE; i++) { |
| 425 | struct cds_hlist_head *head; |
| 426 | struct lttng_ust_dl_node *e; |
| 427 | |
| 428 | head = &dl_state_table[i]; |
| 429 | cds_hlist_for_each_entry_2(e, head, node) { |
| 430 | if (e->marked) { |
| 431 | if (!e->traced) { |
| 432 | trace_lib_load(&e->bin_data, ip); |
| 433 | e->traced = true; |
| 434 | } |
| 435 | e->marked = false; |
| 436 | } else { |
| 437 | if (e->traced) |
| 438 | trace_lib_unload(&e->bin_data, ip); |
| 439 | remove_dl_node(e); |
| 440 | free_dl_node(e); |
| 441 | } |
| 442 | } |
| 443 | } |
| 444 | end: |
| 445 | ust_unlock(); |
| 446 | } |
| 447 | |
| 448 | static |
| 449 | int extract_bin_info_events(struct dl_phdr_info *info, size_t size __attribute__((unused)), void *_data) |
| 450 | { |
| 451 | int j, ret = 0; |
| 452 | struct dl_iterate_data *data = _data; |
| 453 | |
| 454 | if (data->first) { |
| 455 | iter_begin(data); |
| 456 | data->first = false; |
| 457 | } |
| 458 | |
| 459 | if (data->cancel) |
| 460 | goto end; |
| 461 | |
| 462 | for (j = 0; j < info->dlpi_phnum; j++) { |
| 463 | struct bin_info_data bin_data; |
| 464 | |
| 465 | if (info->dlpi_phdr[j].p_type != PT_LOAD) |
| 466 | continue; |
| 467 | |
| 468 | memset(&bin_data, 0, sizeof(bin_data)); |
| 469 | |
| 470 | /* Calculate virtual memory address of the loadable segment */ |
| 471 | bin_data.base_addr_ptr = (void *) info->dlpi_addr + |
| 472 | info->dlpi_phdr[j].p_vaddr; |
| 473 | |
| 474 | if ((info->dlpi_name == NULL || info->dlpi_name[0] == 0)) { |
| 475 | /* |
| 476 | * Only the first phdr without a dlpi_name |
| 477 | * encountered is considered as the program |
| 478 | * executable. The rest are vdsos. |
| 479 | */ |
| 480 | if (!data->exec_found) { |
| 481 | ssize_t path_len; |
| 482 | data->exec_found = 1; |
| 483 | |
| 484 | /* |
| 485 | * Use /proc/self/exe to resolve the |
| 486 | * executable's full path. |
| 487 | */ |
| 488 | path_len = readlink("/proc/self/exe", |
| 489 | bin_data.resolved_path, |
| 490 | PATH_MAX - 1); |
| 491 | if (path_len <= 0) |
| 492 | break; |
| 493 | |
| 494 | bin_data.resolved_path[path_len] = '\0'; |
| 495 | bin_data.vdso = 0; |
| 496 | } else { |
| 497 | snprintf(bin_data.resolved_path, |
| 498 | PATH_MAX - 1, "[vdso]"); |
| 499 | bin_data.vdso = 1; |
| 500 | } |
| 501 | } else { |
| 502 | /* |
| 503 | * For regular dl_phdr_info entries check if |
| 504 | * the path to the binary really exists. If not, |
| 505 | * treat as vdso and use dlpi_name as 'path'. |
| 506 | */ |
| 507 | if (!realpath(info->dlpi_name, |
| 508 | bin_data.resolved_path)) { |
| 509 | snprintf(bin_data.resolved_path, |
| 510 | PATH_MAX - 1, "[%s]", |
| 511 | info->dlpi_name); |
| 512 | bin_data.vdso = 1; |
| 513 | } else { |
| 514 | bin_data.vdso = 0; |
| 515 | } |
| 516 | } |
| 517 | |
| 518 | ret = extract_baddr(&bin_data); |
| 519 | break; |
| 520 | } |
| 521 | end: |
| 522 | return ret; |
| 523 | } |
| 524 | |
| 525 | static |
| 526 | void ust_dl_table_statedump(void *owner) |
| 527 | { |
| 528 | unsigned int i; |
| 529 | |
| 530 | if (ust_lock()) |
| 531 | goto end; |
| 532 | |
| 533 | /* Statedump each traced table entry into session for owner. */ |
| 534 | for (i = 0; i < UST_DL_STATE_TABLE_SIZE; i++) { |
| 535 | struct cds_hlist_head *head; |
| 536 | struct lttng_ust_dl_node *e; |
| 537 | |
| 538 | head = &dl_state_table[i]; |
| 539 | cds_hlist_for_each_entry_2(e, head, node) { |
| 540 | if (e->traced) |
| 541 | trace_baddr(&e->bin_data, owner); |
| 542 | } |
| 543 | } |
| 544 | |
| 545 | end: |
| 546 | ust_unlock(); |
| 547 | } |
| 548 | |
| 549 | void lttng_ust_dl_update(void *ip) |
| 550 | { |
| 551 | struct dl_iterate_data data; |
| 552 | |
| 553 | if (lttng_ust_getenv("LTTNG_UST_WITHOUT_BADDR_STATEDUMP")) |
| 554 | return; |
| 555 | |
| 556 | /* |
| 557 | * Fixup lttng-ust TLS when called from dlopen/dlclose |
| 558 | * instrumentation. |
| 559 | */ |
| 560 | lttng_ust_fixup_tls(); |
| 561 | |
| 562 | data.exec_found = 0; |
| 563 | data.first = true; |
| 564 | data.cancel = false; |
| 565 | /* |
| 566 | * Iterate through the list of currently loaded shared objects and |
| 567 | * generate tables entries for loadable segments using |
| 568 | * extract_bin_info_events. |
| 569 | * Removed libraries are detected by mark-and-sweep: marking is |
| 570 | * done in the iteration over libraries, and sweeping is |
| 571 | * performed by iter_end(). |
| 572 | */ |
| 573 | dl_iterate_phdr(extract_bin_info_events, &data); |
| 574 | if (data.first) |
| 575 | iter_begin(&data); |
| 576 | iter_end(&data, ip); |
| 577 | } |
| 578 | |
| 579 | /* |
| 580 | * Generate a statedump of base addresses of all shared objects loaded |
| 581 | * by the traced application, as well as for the application's |
| 582 | * executable itself. |
| 583 | */ |
| 584 | static |
| 585 | int do_baddr_statedump(void *owner) |
| 586 | { |
| 587 | if (lttng_ust_getenv("LTTNG_UST_WITHOUT_BADDR_STATEDUMP")) |
| 588 | return 0; |
| 589 | lttng_ust_dl_update(LTTNG_UST_CALLER_IP()); |
| 590 | ust_dl_table_statedump(owner); |
| 591 | return 0; |
| 592 | } |
| 593 | |
| 594 | static |
| 595 | int do_procname_statedump(void *owner) |
| 596 | { |
| 597 | if (lttng_ust_getenv("LTTNG_UST_WITHOUT_PROCNAME_STATEDUMP")) |
| 598 | return 0; |
| 599 | |
| 600 | trace_statedump_event(procname_cb, owner, lttng_ust_sockinfo_get_procname(owner)); |
| 601 | return 0; |
| 602 | } |
| 603 | |
| 604 | /* |
| 605 | * Generate a statedump of a given traced application. A statedump is |
| 606 | * delimited by start and end events. For a given (process, session) |
| 607 | * pair, begin/end events are serialized and will match. However, in a |
| 608 | * session, statedumps from different processes may be |
| 609 | * interleaved. The vpid context should be used to identify which |
| 610 | * events belong to which process. |
| 611 | * |
| 612 | * Grab the ust_lock outside of the RCU read-side lock because we |
| 613 | * perform synchronize_rcu with the ust_lock held, which can trigger |
| 614 | * deadlocks otherwise. |
| 615 | */ |
| 616 | int do_lttng_ust_statedump(void *owner) |
| 617 | { |
| 618 | ust_lock_nocheck(); |
| 619 | trace_statedump_start(owner); |
| 620 | ust_unlock(); |
| 621 | |
| 622 | do_procname_statedump(owner); |
| 623 | do_baddr_statedump(owner); |
| 624 | |
| 625 | ust_lock_nocheck(); |
| 626 | trace_statedump_end(owner); |
| 627 | ust_unlock(); |
| 628 | |
| 629 | return 0; |
| 630 | } |
| 631 | |
| 632 | void lttng_ust_statedump_init(void) |
| 633 | { |
| 634 | lttng_ust__tracepoints__init(); |
| 635 | lttng_ust__tracepoints__ptrs_init(); |
| 636 | lttng_ust__events_init__lttng_ust_statedump(); |
| 637 | lttng_ust_dl_update(LTTNG_UST_CALLER_IP()); |
| 638 | } |
| 639 | |
| 640 | static |
| 641 | void ust_dl_state_destroy(void) |
| 642 | { |
| 643 | unsigned int i; |
| 644 | |
| 645 | for (i = 0; i < UST_DL_STATE_TABLE_SIZE; i++) { |
| 646 | struct cds_hlist_head *head; |
| 647 | struct lttng_ust_dl_node *e, *tmp; |
| 648 | |
| 649 | head = &dl_state_table[i]; |
| 650 | cds_hlist_for_each_entry_safe_2(e, tmp, head, node) |
| 651 | free_dl_node(e); |
| 652 | CDS_INIT_HLIST_HEAD(head); |
| 653 | } |
| 654 | } |
| 655 | |
| 656 | void lttng_ust_statedump_destroy(void) |
| 657 | { |
| 658 | lttng_ust__events_exit__lttng_ust_statedump(); |
| 659 | lttng_ust__tracepoints__ptrs_destroy(); |
| 660 | lttng_ust__tracepoints__destroy(); |
| 661 | ust_dl_state_destroy(); |
| 662 | } |