1 /* SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause) */ 2 3 /* 4 * Internal libbpf helpers. 5 * 6 * Copyright (c) 2019 Facebook 7 */ 8 9 #ifndef __LIBBPF_LIBBPF_INTERNAL_H 10 #define __LIBBPF_LIBBPF_INTERNAL_H 11 12 #include <stdlib.h> 13 #include <limits.h> 14 #include <errno.h> 15 #include <linux/err.h> 16 #include <fcntl.h> 17 #include <unistd.h> 18 #include <libelf.h> 19 #include "relo_core.h" 20 21 /* Android's libc doesn't support AT_EACCESS in faccessat() implementation 22 * ([0]), and just returns -EINVAL even if file exists and is accessible. 23 * See [1] for issues caused by this. 24 * 25 * So just redefine it to 0 on Android. 26 * 27 * [0] https://android.googlesource.com/platform/bionic/+/refs/heads/android13-release/libc/bionic/faccessat.cpp#50 28 * [1] https://github.com/libbpf/libbpf-bootstrap/issues/250#issuecomment-1911324250 29 */ 30 #ifdef __ANDROID__ 31 #undef AT_EACCESS 32 #define AT_EACCESS 0 33 #endif 34 35 /* make sure libbpf doesn't use kernel-only integer typedefs */ 36 #pragma GCC poison u8 u16 u32 u64 s8 s16 s32 s64 37 38 /* prevent accidental re-addition of reallocarray() */ 39 #pragma GCC poison reallocarray 40 41 #include "libbpf.h" 42 #include "btf.h" 43 44 #ifndef EM_BPF 45 #define EM_BPF 247 46 #endif 47 48 #ifndef R_BPF_64_64 49 #define R_BPF_64_64 1 50 #endif 51 #ifndef R_BPF_64_ABS64 52 #define R_BPF_64_ABS64 2 53 #endif 54 #ifndef R_BPF_64_ABS32 55 #define R_BPF_64_ABS32 3 56 #endif 57 #ifndef R_BPF_64_32 58 #define R_BPF_64_32 10 59 #endif 60 61 #ifndef SHT_LLVM_ADDRSIG 62 #define SHT_LLVM_ADDRSIG 0x6FFF4C03 63 #endif 64 65 /* if libelf is old and doesn't support mmap(), fall back to read() */ 66 #ifndef ELF_C_READ_MMAP 67 #define ELF_C_READ_MMAP ELF_C_READ 68 #endif 69 70 /* Older libelf all end up in this expression, for both 32 and 64 bit */ 71 #ifndef ELF64_ST_VISIBILITY 72 #define ELF64_ST_VISIBILITY(o) ((o) & 0x03) 73 #endif 74 75 #define BTF_INFO_ENC(kind, kind_flag, vlen) \ 76 ((!!(kind_flag) << 31) | ((kind) << 24) | ((vlen) & BTF_MAX_VLEN)) 77 #define BTF_TYPE_ENC(name, info, size_or_type) (name), (info), (size_or_type) 78 #define BTF_INT_ENC(encoding, bits_offset, nr_bits) \ 79 ((encoding) << 24 | (bits_offset) << 16 | (nr_bits)) 80 #define BTF_TYPE_INT_ENC(name, encoding, bits_offset, bits, sz) \ 81 BTF_TYPE_ENC(name, BTF_INFO_ENC(BTF_KIND_INT, 0, 0), sz), \ 82 BTF_INT_ENC(encoding, bits_offset, bits) 83 #define BTF_MEMBER_ENC(name, type, bits_offset) (name), (type), (bits_offset) 84 #define BTF_PARAM_ENC(name, type) (name), (type) 85 #define BTF_VAR_SECINFO_ENC(type, offset, size) (type), (offset), (size) 86 #define BTF_TYPE_FLOAT_ENC(name, sz) \ 87 BTF_TYPE_ENC(name, BTF_INFO_ENC(BTF_KIND_FLOAT, 0, 0), sz) 88 #define BTF_TYPE_DECL_TAG_ENC(value, type, component_idx) \ 89 BTF_TYPE_ENC(value, BTF_INFO_ENC(BTF_KIND_DECL_TAG, 0, 0), type), (component_idx) 90 #define BTF_TYPE_TYPE_TAG_ENC(value, type) \ 91 BTF_TYPE_ENC(value, BTF_INFO_ENC(BTF_KIND_TYPE_TAG, 0, 0), type) 92 93 #ifndef likely 94 #define likely(x) __builtin_expect(!!(x), 1) 95 #endif 96 #ifndef unlikely 97 #define unlikely(x) __builtin_expect(!!(x), 0) 98 #endif 99 #ifndef min 100 # define min(x, y) ((x) < (y) ? (x) : (y)) 101 #endif 102 #ifndef max 103 # define max(x, y) ((x) < (y) ? (y) : (x)) 104 #endif 105 #ifndef offsetofend 106 # define offsetofend(TYPE, FIELD) \ 107 (offsetof(TYPE, FIELD) + sizeof(((TYPE *)0)->FIELD)) 108 #endif 109 #ifndef __alias 110 #define __alias(symbol) __attribute__((alias(#symbol))) 111 #endif 112 113 /* Check whether a string `str` has prefix `pfx`, regardless if `pfx` is 114 * a string literal known at compilation time or char * pointer known only at 115 * runtime. 116 */ 117 #define str_has_pfx(str, pfx) \ 118 (strncmp(str, pfx, __builtin_constant_p(pfx) ? sizeof(pfx) - 1 : strlen(pfx)) == 0) 119 120 /* suffix check */ 121 static inline bool str_has_sfx(const char *str, const char *sfx) 122 { 123 size_t str_len = strlen(str); 124 size_t sfx_len = strlen(sfx); 125 126 if (sfx_len > str_len) 127 return false; 128 return strcmp(str + str_len - sfx_len, sfx) == 0; 129 } 130 131 /* Symbol versioning is different between static and shared library. 132 * Properly versioned symbols are needed for shared library, but 133 * only the symbol of the new version is needed for static library. 134 * Starting with GNU C 10, use symver attribute instead of .symver assembler 135 * directive, which works better with GCC LTO builds. 136 */ 137 #if defined(SHARED) && defined(__GNUC__) && __GNUC__ >= 10 138 139 #define DEFAULT_VERSION(internal_name, api_name, version) \ 140 __attribute__((symver(#api_name "@@" #version))) 141 #define COMPAT_VERSION(internal_name, api_name, version) \ 142 __attribute__((symver(#api_name "@" #version))) 143 144 #elif defined(SHARED) 145 146 #define COMPAT_VERSION(internal_name, api_name, version) \ 147 asm(".symver " #internal_name "," #api_name "@" #version); 148 #define DEFAULT_VERSION(internal_name, api_name, version) \ 149 asm(".symver " #internal_name "," #api_name "@@" #version); 150 151 #else /* !SHARED */ 152 153 #define COMPAT_VERSION(internal_name, api_name, version) 154 #define DEFAULT_VERSION(internal_name, api_name, version) \ 155 extern typeof(internal_name) api_name \ 156 __attribute__((alias(#internal_name))); 157 158 #endif 159 160 extern void libbpf_print(enum libbpf_print_level level, 161 const char *format, ...) 162 __attribute__((format(printf, 2, 3))); 163 164 #define __pr(level, fmt, ...) \ 165 do { \ 166 libbpf_print(level, "libbpf: " fmt, ##__VA_ARGS__); \ 167 } while (0) 168 169 #define pr_warn(fmt, ...) __pr(LIBBPF_WARN, fmt, ##__VA_ARGS__) 170 #define pr_info(fmt, ...) __pr(LIBBPF_INFO, fmt, ##__VA_ARGS__) 171 #define pr_debug(fmt, ...) __pr(LIBBPF_DEBUG, fmt, ##__VA_ARGS__) 172 173 #ifndef __has_builtin 174 #define __has_builtin(x) 0 175 #endif 176 177 struct bpf_link { 178 int (*detach)(struct bpf_link *link); 179 void (*dealloc)(struct bpf_link *link); 180 char *pin_path; /* NULL, if not pinned */ 181 int fd; /* hook FD, -1 if not applicable */ 182 bool disconnected; 183 }; 184 185 /* 186 * Re-implement glibc's reallocarray() for libbpf internal-only use. 187 * reallocarray(), unfortunately, is not available in all versions of glibc, 188 * so requires extra feature detection and using reallocarray() stub from 189 * <tools/libc_compat.h> and COMPAT_NEED_REALLOCARRAY. All this complicates 190 * build of libbpf unnecessarily and is just a maintenance burden. Instead, 191 * it's trivial to implement libbpf-specific internal version and use it 192 * throughout libbpf. 193 */ 194 static inline void *libbpf_reallocarray(void *ptr, size_t nmemb, size_t size) 195 { 196 size_t total; 197 198 #if __has_builtin(__builtin_mul_overflow) 199 if (unlikely(__builtin_mul_overflow(nmemb, size, &total))) 200 return NULL; 201 #else 202 if (size == 0 || nmemb > ULONG_MAX / size) 203 return NULL; 204 total = nmemb * size; 205 #endif 206 return realloc(ptr, total); 207 } 208 209 /* Copy up to sz - 1 bytes from zero-terminated src string and ensure that dst 210 * is zero-terminated string no matter what (unless sz == 0, in which case 211 * it's a no-op). It's conceptually close to FreeBSD's strlcpy(), but differs 212 * in what is returned. Given this is internal helper, it's trivial to extend 213 * this, when necessary. Use this instead of strncpy inside libbpf source code. 214 */ 215 static inline void libbpf_strlcpy(char *dst, const char *src, size_t sz) 216 { 217 size_t i; 218 219 if (sz == 0) 220 return; 221 222 sz--; 223 for (i = 0; i < sz && src[i]; i++) 224 dst[i] = src[i]; 225 dst[i] = '\0'; 226 } 227 228 __u32 get_kernel_version(void); 229 230 struct btf; 231 struct btf_type; 232 233 struct btf_type *btf_type_by_id(const struct btf *btf, __u32 type_id); 234 const char *btf_kind_str(const struct btf_type *t); 235 const struct btf_type *skip_mods_and_typedefs(const struct btf *btf, __u32 id, __u32 *res_id); 236 237 static inline enum btf_func_linkage btf_func_linkage(const struct btf_type *t) 238 { 239 return (enum btf_func_linkage)(int)btf_vlen(t); 240 } 241 242 static inline __u32 btf_type_info(int kind, int vlen, int kflag) 243 { 244 return (kflag << 31) | (kind << 24) | vlen; 245 } 246 247 enum map_def_parts { 248 MAP_DEF_MAP_TYPE = 0x001, 249 MAP_DEF_KEY_TYPE = 0x002, 250 MAP_DEF_KEY_SIZE = 0x004, 251 MAP_DEF_VALUE_TYPE = 0x008, 252 MAP_DEF_VALUE_SIZE = 0x010, 253 MAP_DEF_MAX_ENTRIES = 0x020, 254 MAP_DEF_MAP_FLAGS = 0x040, 255 MAP_DEF_NUMA_NODE = 0x080, 256 MAP_DEF_PINNING = 0x100, 257 MAP_DEF_INNER_MAP = 0x200, 258 MAP_DEF_MAP_EXTRA = 0x400, 259 260 MAP_DEF_ALL = 0x7ff, /* combination of all above */ 261 }; 262 263 struct btf_map_def { 264 enum map_def_parts parts; 265 __u32 map_type; 266 __u32 key_type_id; 267 __u32 key_size; 268 __u32 value_type_id; 269 __u32 value_size; 270 __u32 max_entries; 271 __u32 map_flags; 272 __u32 numa_node; 273 __u32 pinning; 274 __u64 map_extra; 275 }; 276 277 int parse_btf_map_def(const char *map_name, struct btf *btf, 278 const struct btf_type *def_t, bool strict, 279 struct btf_map_def *map_def, struct btf_map_def *inner_def); 280 281 void *libbpf_add_mem(void **data, size_t *cap_cnt, size_t elem_sz, 282 size_t cur_cnt, size_t max_cnt, size_t add_cnt); 283 int libbpf_ensure_mem(void **data, size_t *cap_cnt, size_t elem_sz, size_t need_cnt); 284 285 static inline bool libbpf_is_mem_zeroed(const char *p, ssize_t len) 286 { 287 while (len > 0) { 288 if (*p) 289 return false; 290 p++; 291 len--; 292 } 293 return true; 294 } 295 296 static inline bool libbpf_validate_opts(const char *opts, 297 size_t opts_sz, size_t user_sz, 298 const char *type_name) 299 { 300 if (user_sz < sizeof(size_t)) { 301 pr_warn("%s size (%zu) is too small\n", type_name, user_sz); 302 return false; 303 } 304 if (!libbpf_is_mem_zeroed(opts + opts_sz, (ssize_t)user_sz - opts_sz)) { 305 pr_warn("%s has non-zero extra bytes\n", type_name); 306 return false; 307 } 308 return true; 309 } 310 311 #define OPTS_VALID(opts, type) \ 312 (!(opts) || libbpf_validate_opts((const char *)opts, \ 313 offsetofend(struct type, \ 314 type##__last_field), \ 315 (opts)->sz, #type)) 316 #define OPTS_HAS(opts, field) \ 317 ((opts) && opts->sz >= offsetofend(typeof(*(opts)), field)) 318 #define OPTS_GET(opts, field, fallback_value) \ 319 (OPTS_HAS(opts, field) ? (opts)->field : fallback_value) 320 #define OPTS_SET(opts, field, value) \ 321 do { \ 322 if (OPTS_HAS(opts, field)) \ 323 (opts)->field = value; \ 324 } while (0) 325 326 #define OPTS_ZEROED(opts, last_nonzero_field) \ 327 ({ \ 328 ssize_t __off = offsetofend(typeof(*(opts)), last_nonzero_field); \ 329 !(opts) || libbpf_is_mem_zeroed((const void *)opts + __off, \ 330 (opts)->sz - __off); \ 331 }) 332 333 enum kern_feature_id { 334 /* v4.14: kernel support for program & map names. */ 335 FEAT_PROG_NAME, 336 /* v5.2: kernel support for global data sections. */ 337 FEAT_GLOBAL_DATA, 338 /* BTF support */ 339 FEAT_BTF, 340 /* BTF_KIND_FUNC and BTF_KIND_FUNC_PROTO support */ 341 FEAT_BTF_FUNC, 342 /* BTF_KIND_VAR and BTF_KIND_DATASEC support */ 343 FEAT_BTF_DATASEC, 344 /* BTF_FUNC_GLOBAL is supported */ 345 FEAT_BTF_GLOBAL_FUNC, 346 /* BPF_F_MMAPABLE is supported for arrays */ 347 FEAT_ARRAY_MMAP, 348 /* kernel support for expected_attach_type in BPF_PROG_LOAD */ 349 FEAT_EXP_ATTACH_TYPE, 350 /* bpf_probe_read_{kernel,user}[_str] helpers */ 351 FEAT_PROBE_READ_KERN, 352 /* BPF_PROG_BIND_MAP is supported */ 353 FEAT_PROG_BIND_MAP, 354 /* Kernel support for module BTFs */ 355 FEAT_MODULE_BTF, 356 /* BTF_KIND_FLOAT support */ 357 FEAT_BTF_FLOAT, 358 /* BPF perf link support */ 359 FEAT_PERF_LINK, 360 /* BTF_KIND_DECL_TAG support */ 361 FEAT_BTF_DECL_TAG, 362 /* BTF_KIND_TYPE_TAG support */ 363 FEAT_BTF_TYPE_TAG, 364 /* memcg-based accounting for BPF maps and progs */ 365 FEAT_MEMCG_ACCOUNT, 366 /* BPF cookie (bpf_get_attach_cookie() BPF helper) support */ 367 FEAT_BPF_COOKIE, 368 /* BTF_KIND_ENUM64 support and BTF_KIND_ENUM kflag support */ 369 FEAT_BTF_ENUM64, 370 /* Kernel uses syscall wrapper (CONFIG_ARCH_HAS_SYSCALL_WRAPPER) */ 371 FEAT_SYSCALL_WRAPPER, 372 /* BPF multi-uprobe link support */ 373 FEAT_UPROBE_MULTI_LINK, 374 __FEAT_CNT, 375 }; 376 377 int probe_memcg_account(void); 378 bool kernel_supports(const struct bpf_object *obj, enum kern_feature_id feat_id); 379 int bump_rlimit_memlock(void); 380 381 int parse_cpu_mask_str(const char *s, bool **mask, int *mask_sz); 382 int parse_cpu_mask_file(const char *fcpu, bool **mask, int *mask_sz); 383 int libbpf__load_raw_btf(const char *raw_types, size_t types_len, 384 const char *str_sec, size_t str_len); 385 int btf_load_into_kernel(struct btf *btf, char *log_buf, size_t log_sz, __u32 log_level); 386 387 struct btf *btf_get_from_fd(int btf_fd, struct btf *base_btf); 388 void btf_get_kernel_prefix_kind(enum bpf_attach_type attach_type, 389 const char **prefix, int *kind); 390 391 struct btf_ext_info { 392 /* 393 * info points to the individual info section (e.g. func_info and 394 * line_info) from the .BTF.ext. It does not include the __u32 rec_size. 395 */ 396 void *info; 397 __u32 rec_size; 398 __u32 len; 399 /* optional (maintained internally by libbpf) mapping between .BTF.ext 400 * section and corresponding ELF section. This is used to join 401 * information like CO-RE relocation records with corresponding BPF 402 * programs defined in ELF sections 403 */ 404 __u32 *sec_idxs; 405 int sec_cnt; 406 }; 407 408 #define for_each_btf_ext_sec(seg, sec) \ 409 for (sec = (seg)->info; \ 410 (void *)sec < (seg)->info + (seg)->len; \ 411 sec = (void *)sec + sizeof(struct btf_ext_info_sec) + \ 412 (seg)->rec_size * sec->num_info) 413 414 #define for_each_btf_ext_rec(seg, sec, i, rec) \ 415 for (i = 0, rec = (void *)&(sec)->data; \ 416 i < (sec)->num_info; \ 417 i++, rec = (void *)rec + (seg)->rec_size) 418 419 /* 420 * The .BTF.ext ELF section layout defined as 421 * struct btf_ext_header 422 * func_info subsection 423 * 424 * The func_info subsection layout: 425 * record size for struct bpf_func_info in the func_info subsection 426 * struct btf_sec_func_info for section #1 427 * a list of bpf_func_info records for section #1 428 * where struct bpf_func_info mimics one in include/uapi/linux/bpf.h 429 * but may not be identical 430 * struct btf_sec_func_info for section #2 431 * a list of bpf_func_info records for section #2 432 * ...... 433 * 434 * Note that the bpf_func_info record size in .BTF.ext may not 435 * be the same as the one defined in include/uapi/linux/bpf.h. 436 * The loader should ensure that record_size meets minimum 437 * requirement and pass the record as is to the kernel. The 438 * kernel will handle the func_info properly based on its contents. 439 */ 440 struct btf_ext_header { 441 __u16 magic; 442 __u8 version; 443 __u8 flags; 444 __u32 hdr_len; 445 446 /* All offsets are in bytes relative to the end of this header */ 447 __u32 func_info_off; 448 __u32 func_info_len; 449 __u32 line_info_off; 450 __u32 line_info_len; 451 452 /* optional part of .BTF.ext header */ 453 __u32 core_relo_off; 454 __u32 core_relo_len; 455 }; 456 457 struct btf_ext { 458 union { 459 struct btf_ext_header *hdr; 460 void *data; 461 }; 462 struct btf_ext_info func_info; 463 struct btf_ext_info line_info; 464 struct btf_ext_info core_relo_info; 465 __u32 data_size; 466 }; 467 468 struct btf_ext_info_sec { 469 __u32 sec_name_off; 470 __u32 num_info; 471 /* Followed by num_info * record_size number of bytes */ 472 __u8 data[]; 473 }; 474 475 /* The minimum bpf_func_info checked by the loader */ 476 struct bpf_func_info_min { 477 __u32 insn_off; 478 __u32 type_id; 479 }; 480 481 /* The minimum bpf_line_info checked by the loader */ 482 struct bpf_line_info_min { 483 __u32 insn_off; 484 __u32 file_name_off; 485 __u32 line_off; 486 __u32 line_col; 487 }; 488 489 490 typedef int (*type_id_visit_fn)(__u32 *type_id, void *ctx); 491 typedef int (*str_off_visit_fn)(__u32 *str_off, void *ctx); 492 int btf_type_visit_type_ids(struct btf_type *t, type_id_visit_fn visit, void *ctx); 493 int btf_type_visit_str_offs(struct btf_type *t, str_off_visit_fn visit, void *ctx); 494 int btf_ext_visit_type_ids(struct btf_ext *btf_ext, type_id_visit_fn visit, void *ctx); 495 int btf_ext_visit_str_offs(struct btf_ext *btf_ext, str_off_visit_fn visit, void *ctx); 496 __s32 btf__find_by_name_kind_own(const struct btf *btf, const char *type_name, 497 __u32 kind); 498 499 typedef int (*kallsyms_cb_t)(unsigned long long sym_addr, char sym_type, 500 const char *sym_name, void *ctx); 501 502 int libbpf_kallsyms_parse(kallsyms_cb_t cb, void *arg); 503 504 /* handle direct returned errors */ 505 static inline int libbpf_err(int ret) 506 { 507 if (ret < 0) 508 errno = -ret; 509 return ret; 510 } 511 512 /* handle errno-based (e.g., syscall or libc) errors according to libbpf's 513 * strict mode settings 514 */ 515 static inline int libbpf_err_errno(int ret) 516 { 517 /* errno is already assumed to be set on error */ 518 return ret < 0 ? -errno : ret; 519 } 520 521 /* handle error for pointer-returning APIs, err is assumed to be < 0 always */ 522 static inline void *libbpf_err_ptr(int err) 523 { 524 /* set errno on error, this doesn't break anything */ 525 errno = -err; 526 return NULL; 527 } 528 529 /* handle pointer-returning APIs' error handling */ 530 static inline void *libbpf_ptr(void *ret) 531 { 532 /* set errno on error, this doesn't break anything */ 533 if (IS_ERR(ret)) 534 errno = -PTR_ERR(ret); 535 536 return IS_ERR(ret) ? NULL : ret; 537 } 538 539 static inline bool str_is_empty(const char *s) 540 { 541 return !s || !s[0]; 542 } 543 544 static inline bool is_ldimm64_insn(struct bpf_insn *insn) 545 { 546 return insn->code == (BPF_LD | BPF_IMM | BPF_DW); 547 } 548 549 /* if fd is stdin, stdout, or stderr, dup to a fd greater than 2 550 * Takes ownership of the fd passed in, and closes it if calling 551 * fcntl(fd, F_DUPFD_CLOEXEC, 3). 552 */ 553 static inline int ensure_good_fd(int fd) 554 { 555 int old_fd = fd, saved_errno; 556 557 if (fd < 0) 558 return fd; 559 if (fd < 3) { 560 fd = fcntl(fd, F_DUPFD_CLOEXEC, 3); 561 saved_errno = errno; 562 close(old_fd); 563 errno = saved_errno; 564 if (fd < 0) { 565 pr_warn("failed to dup FD %d to FD > 2: %d\n", old_fd, -saved_errno); 566 errno = saved_errno; 567 } 568 } 569 return fd; 570 } 571 572 /* The following two functions are exposed to bpftool */ 573 int bpf_core_add_cands(struct bpf_core_cand *local_cand, 574 size_t local_essent_len, 575 const struct btf *targ_btf, 576 const char *targ_btf_name, 577 int targ_start_id, 578 struct bpf_core_cand_list *cands); 579 void bpf_core_free_cands(struct bpf_core_cand_list *cands); 580 581 struct usdt_manager *usdt_manager_new(struct bpf_object *obj); 582 void usdt_manager_free(struct usdt_manager *man); 583 struct bpf_link * usdt_manager_attach_usdt(struct usdt_manager *man, 584 const struct bpf_program *prog, 585 pid_t pid, const char *path, 586 const char *usdt_provider, const char *usdt_name, 587 __u64 usdt_cookie); 588 589 static inline bool is_pow_of_2(size_t x) 590 { 591 return x && (x & (x - 1)) == 0; 592 } 593 594 #define PROG_LOAD_ATTEMPTS 5 595 int sys_bpf_prog_load(union bpf_attr *attr, unsigned int size, int attempts); 596 597 bool glob_match(const char *str, const char *pat); 598 599 long elf_find_func_offset(Elf *elf, const char *binary_path, const char *name); 600 long elf_find_func_offset_from_file(const char *binary_path, const char *name); 601 602 struct elf_fd { 603 Elf *elf; 604 int fd; 605 }; 606 607 int elf_open(const char *binary_path, struct elf_fd *elf_fd); 608 void elf_close(struct elf_fd *elf_fd); 609 610 int elf_resolve_syms_offsets(const char *binary_path, int cnt, 611 const char **syms, unsigned long **poffsets); 612 int elf_resolve_pattern_offsets(const char *binary_path, const char *pattern, 613 unsigned long **poffsets, size_t *pcnt); 614 615 #endif /* __LIBBPF_LIBBPF_INTERNAL_H */ 616