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 */
str_has_sfx(const char * str,const char * sfx)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 */
libbpf_reallocarray(void * ptr,size_t nmemb,size_t size)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 */
libbpf_strlcpy(char * dst,const char * src,size_t sz)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
btf_func_linkage(const struct btf_type * t)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
btf_type_info(int kind,int vlen,int kflag)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
libbpf_is_mem_zeroed(const char * p,ssize_t len)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
libbpf_validate_opts(const char * opts,size_t opts_sz,size_t user_sz,const char * type_name)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 */
libbpf_err(int ret)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 */
libbpf_err_errno(int ret)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 */
libbpf_err_ptr(int err)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 */
libbpf_ptr(void * ret)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
str_is_empty(const char * s)539 static inline bool str_is_empty(const char *s)
540 {
541 return !s || !s[0];
542 }
543
is_ldimm64_insn(struct bpf_insn * insn)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 */
ensure_good_fd(int fd)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
is_pow_of_2(size_t x)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