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