From 55944e5e40b1be2afc4855d8d2baf4b73d1876b5 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Wed, 10 Apr 2024 22:49:52 +0200 Subject: Adding upstream version 255.4. Signed-off-by: Daniel Baumann --- src/shared/dlfcn-util.h | 39 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 39 insertions(+) create mode 100644 src/shared/dlfcn-util.h (limited to 'src/shared/dlfcn-util.h') diff --git a/src/shared/dlfcn-util.h b/src/shared/dlfcn-util.h new file mode 100644 index 0000000..7d8cb4c --- /dev/null +++ b/src/shared/dlfcn-util.h @@ -0,0 +1,39 @@ +/* SPDX-License-Identifier: LGPL-2.1-or-later */ +#pragma once + +#include + +#include "macro.h" + +DEFINE_TRIVIAL_CLEANUP_FUNC_FULL(void*, dlclose, NULL); + +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) + +static inline void *safe_dlclose(void *p) { + if (!p) + return NULL; + + assert_se(dlclose(p) == 0); + return NULL; +} -- cgit v1.2.3