Systemd/src/basic/dlfcn-util.h

/* SPDX-License-Identifier: LGPL-2.1-or-later */
#pragma once

#include <dlfcn.h>

#include "macro.h"

DEFINE_TRIVIAL_CLEANUP_FUNC(void*, dlclose);

int dlsym_many_and_warn(void *dl, int level, ...);

/* Macro useful for putting together variable/symbol name pairs when calling dlsym_many_and_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) \
        &sym_##arg, STRINGIFY(arg)
license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 05:23:58 +01:00			`/* SPDX-License-Identifier: LGPL-2.1-or-later */`
util: add dlfcn-util.h This just adds a _cleanup_ helper call encapsulating dlclose(). This also means libsystemd-shared is linked against libdl now. I don't think this is much of an issue, since libdl is part of glibc anyway, and anything from exotic. It's not an optional part of the OS (think: NSS requires dynamic linking), hence this pulls in no deps and is almost certainly loaded into all process' memory anyway. [zj: use DEFINE_TRIVIAL_CLEANUP_FUNC().] 2020-06-04 11:25:46 +02:00			`#pragma once`

			`#include <dlfcn.h>`

			`#include "macro.h"`

			`DEFINE_TRIVIAL_CLEANUP_FUNC(void*, dlclose);`
dlfcn-util: add dlsym_many_and_warn() helper When we dlopen() some library we most likely will resolve more than a few symbols, hence add a helper that makes it easy. 2020-06-24 14:47:39 +02:00
			`int dlsym_many_and_warn(void *dl, int level, ...);`
dlfcn-util: add DLSYM_ARG() helper 2020-11-30 17:22:35 +01:00
			`/* Macro useful for putting together variable/symbol name pairs when calling dlsym_many_and_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) \`
			`&sym_##arg, STRINGIFY(arg)`