1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
|
/* SPDX-License-Identifier: LGPL-2.1-or-later */
#pragma once
#include <dlfcn.h>
#include "macro.h"
static inline void* safe_dlclose(void *dl) {
if (!dl)
return NULL;
assert_se(dlclose(dl) == 0);
return NULL;
}
static inline void dlclosep(void **dlp) {
safe_dlclose(*dlp);
}
int dlsym_many_or_warn_sentinel(void *dl, int log_level, ...) _sentinel_;
int dlopen_many_sym_or_warn_sentinel(void **dlp, const char *filename, int log_level, ...) _sentinel_;
#define dlsym_many_or_warn(dl, log_level, ...) \
dlsym_many_or_warn_sentinel(dl, log_level, __VA_ARGS__, NULL)
#define dlopen_many_sym_or_warn(dlp, filename, log_level, ...) \
dlopen_many_sym_or_warn_sentinel(dlp, filename, log_level, __VA_ARGS__, NULL)
#define DLSYM_PROTOTYPE(symbol) \
extern typeof(symbol)* sym_##symbol
#define DLSYM_FUNCTION(symbol) \
typeof(symbol)* sym_##symbol = NULL
/* Macro useful for putting together variable/symbol name pairs when calling dlsym_many_or_warn(). Assumes
* that each library symbol to resolve will be placed in a variable with the "sym_" prefix, i.e. a symbol
* "foobar" is loaded into a variable "sym_foobar". */
#define DLSYM_ARG(arg) \
({ assert_cc(__builtin_types_compatible_p(typeof(sym_##arg), typeof(&arg))); &sym_##arg; }), STRINGIFY(arg)
/* libbpf is a bit confused about type-safety and API compatibility. Provide a macro that can tape over that mess. Sad. */
#define DLSYM_ARG_FORCE(arg) \
&sym_##arg, STRINGIFY(arg)
|
