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83 lines
3.0 KiB
83 lines
3.0 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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#include "libbpf_version.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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/* Mark a symbol as deprecated when libbpf version is >= {major}.{minor} */ |
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#define LIBBPF_DEPRECATED_SINCE(major, minor, msg) \ |
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__LIBBPF_MARK_DEPRECATED_ ## major ## _ ## minor \ |
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(LIBBPF_DEPRECATED("libbpf v" # major "." # minor "+: " msg)) |
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#define __LIBBPF_CURRENT_VERSION_GEQ(major, minor) \ |
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(LIBBPF_MAJOR_VERSION > (major) || \ |
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(LIBBPF_MAJOR_VERSION == (major) && LIBBPF_MINOR_VERSION >= (minor))) |
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/* Add checks for other versions below when planning deprecation of API symbols |
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* with the LIBBPF_DEPRECATED_SINCE macro. |
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*/ |
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#if __LIBBPF_CURRENT_VERSION_GEQ(0, 6) |
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#define __LIBBPF_MARK_DEPRECATED_0_6(X) X |
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#else |
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#define __LIBBPF_MARK_DEPRECATED_0_6(X) |
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#endif |
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#if __LIBBPF_CURRENT_VERSION_GEQ(0, 7) |
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#define __LIBBPF_MARK_DEPRECATED_0_7(X) X |
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#else |
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#define __LIBBPF_MARK_DEPRECATED_0_7(X) |
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#endif |
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#if __LIBBPF_CURRENT_VERSION_GEQ(0, 8) |
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#define __LIBBPF_MARK_DEPRECATED_0_8(X) X |
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#else |
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#define __LIBBPF_MARK_DEPRECATED_0_8(X) |
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#endif |
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/* This set of internal macros allows to do "function overloading" based on |
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* number of arguments provided by used in backwards-compatible way during the |
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* transition to libbpf 1.0 |
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* It's ugly but necessary evil that will be cleaned up when we get to 1.0. |
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* See bpf_prog_load() overload for example. |
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*/ |
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#define ___libbpf_cat(A, B) A ## B |
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#define ___libbpf_select(NAME, NUM) ___libbpf_cat(NAME, NUM) |
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#define ___libbpf_nth(_1, _2, _3, _4, _5, _6, N, ...) N |
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#define ___libbpf_cnt(...) ___libbpf_nth(__VA_ARGS__, 6, 5, 4, 3, 2, 1) |
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#define ___libbpf_overload(NAME, ...) ___libbpf_select(NAME, ___libbpf_cnt(__VA_ARGS__))(__VA_ARGS__) |
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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 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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