| /* SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause) */ |
| |
| /* |
| * Common user-facing libbpf helpers. |
| * |
| * Copyright (c) 2019 Facebook |
| */ |
| |
| #ifndef __LIBBPF_LIBBPF_COMMON_H |
| #define __LIBBPF_LIBBPF_COMMON_H |
| |
| #ifndef LIBBPF_API |
| #define LIBBPF_API __attribute__((visibility("default"))) |
| #endif |
| |
| /* Helper macro to declare and initialize libbpf options struct |
| * |
| * This dance with uninitialized declaration, followed by memset to zero, |
| * followed by assignment using compound literal syntax is done to preserve |
| * ability to use a nice struct field initialization syntax and **hopefully** |
| * have all the padding bytes initialized to zero. It's not guaranteed though, |
| * when copying literal, that compiler won't copy garbage in literal's padding |
| * bytes, but that's the best way I've found and it seems to work in practice. |
| * |
| * Macro declares opts struct of given type and name, zero-initializes, |
| * including any extra padding, it with memset() and then assigns initial |
| * values provided by users in struct initializer-syntax as varargs. |
| */ |
| #define DECLARE_LIBBPF_OPTS(TYPE, NAME, ...) \ |
| struct TYPE NAME = ({ \ |
| memset(&NAME, 0, sizeof(struct TYPE)); \ |
| (struct TYPE) { \ |
| .sz = sizeof(struct TYPE), \ |
| __VA_ARGS__ \ |
| }; \ |
| }) |
| |
| #endif /* __LIBBPF_LIBBPF_COMMON_H */ |