74 lines
2.7 KiB
C
74 lines
2.7 KiB
C
/* 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
|
|
|
|
#include <string.h>
|
|
#include "libbpf_version.h"
|
|
|
|
#ifndef LIBBPF_API
|
|
#define LIBBPF_API __attribute__((visibility("default")))
|
|
#endif
|
|
|
|
#define LIBBPF_DEPRECATED(msg) __attribute__((deprecated(msg)))
|
|
|
|
/* Mark a symbol as deprecated when libbpf version is >= {major}.{minor} */
|
|
#define LIBBPF_DEPRECATED_SINCE(major, minor, msg) \
|
|
__LIBBPF_MARK_DEPRECATED_ ## major ## _ ## minor \
|
|
(LIBBPF_DEPRECATED("libbpf v" # major "." # minor "+: " msg))
|
|
|
|
#define __LIBBPF_CURRENT_VERSION_GEQ(major, minor) \
|
|
(LIBBPF_MAJOR_VERSION > (major) || \
|
|
(LIBBPF_MAJOR_VERSION == (major) && LIBBPF_MINOR_VERSION >= (minor)))
|
|
|
|
/* Add checks for other versions below when planning deprecation of API symbols
|
|
* with the LIBBPF_DEPRECATED_SINCE macro.
|
|
*/
|
|
#if __LIBBPF_CURRENT_VERSION_GEQ(1, 0)
|
|
#define __LIBBPF_MARK_DEPRECATED_1_0(X) X
|
|
#else
|
|
#define __LIBBPF_MARK_DEPRECATED_1_0(X)
|
|
#endif
|
|
|
|
/* This set of internal macros allows to do "function overloading" based on
|
|
* number of arguments provided by used in backwards-compatible way during the
|
|
* transition to libbpf 1.0
|
|
* It's ugly but necessary evil that will be cleaned up when we get to 1.0.
|
|
* See bpf_prog_load() overload for example.
|
|
*/
|
|
#define ___libbpf_cat(A, B) A ## B
|
|
#define ___libbpf_select(NAME, NUM) ___libbpf_cat(NAME, NUM)
|
|
#define ___libbpf_nth(_1, _2, _3, _4, _5, _6, N, ...) N
|
|
#define ___libbpf_cnt(...) ___libbpf_nth(__VA_ARGS__, 6, 5, 4, 3, 2, 1)
|
|
#define ___libbpf_overload(NAME, ...) ___libbpf_select(NAME, ___libbpf_cnt(__VA_ARGS__))(__VA_ARGS__)
|
|
|
|
/* 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 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 */
|