diff options
| author | Daniel Borkmann <daniel@iogearbox.net> | 2023-07-19 16:08:55 +0200 |
|---|---|---|
| committer | Alexei Starovoitov <ast@kernel.org> | 2023-07-19 10:07:28 -0700 |
| commit | 4e9c2d9af5612a6992260b3c7d3047c40265861e (patch) | |
| tree | 8114f060617832ef932dbaccf3bdbb265e3cd37a /tools/lib/bpf/libbpf_common.h | |
| parent | 55cc3768473e139483be8f17796b50d21788953f (diff) | |
libbpf: Add helper macro to clear opts structs
Add a small and generic LIBBPF_OPTS_RESET() helper macros which clears an
opts structure and reinitializes its .sz member to place the structure
size. Additionally, the user can pass option-specific data to reinitialize
via varargs.
I found this very useful when developing selftests, but it is also generic
enough as a macro next to the existing LIBBPF_OPTS() which hides the .sz
initialization, too.
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/r/20230719140858.13224-6-daniel@iogearbox.net
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Diffstat (limited to 'tools/lib/bpf/libbpf_common.h')
| -rw-r--r-- | tools/lib/bpf/libbpf_common.h | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/tools/lib/bpf/libbpf_common.h b/tools/lib/bpf/libbpf_common.h index 9a7937f339df..b7060f254486 100644 --- a/tools/lib/bpf/libbpf_common.h +++ b/tools/lib/bpf/libbpf_common.h @@ -70,4 +70,20 @@ }; \ }) +/* Helper macro to clear and optionally reinitialize libbpf options struct + * + * Small helper macro to reset all fields and to reinitialize the common + * structure size member. Values provided by users in struct initializer- + * syntax as varargs can be provided as well to reinitialize options struct + * specific members. + */ +#define LIBBPF_OPTS_RESET(NAME, ...) \ + do { \ + memset(&NAME, 0, sizeof(NAME)); \ + NAME = (typeof(NAME)) { \ + .sz = sizeof(NAME), \ + __VA_ARGS__ \ + }; \ + } while (0) + #endif /* __LIBBPF_LIBBPF_COMMON_H */ |