Messages in this thread Patch in this message | | | From | Florent Revest <> | Subject | [PATCH bpf-next 4/5] libbpf: Introduce a BPF_SNPRINTF helper macro | Date | Wed, 10 Mar 2021 23:02:10 +0100 |
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Similarly to BPF_SEQ_PRINTF, this macro turns variadic arguments into an array of u64, making it more natural to call the bpf_snprintf helper.
Signed-off-by: Florent Revest <revest@chromium.org> --- tools/lib/bpf/bpf_tracing.h | 15 +++++++++++++++ 1 file changed, 15 insertions(+)
diff --git a/tools/lib/bpf/bpf_tracing.h b/tools/lib/bpf/bpf_tracing.h index f6a2deb3cd5b..89e82da9b8a0 100644 --- a/tools/lib/bpf/bpf_tracing.h +++ b/tools/lib/bpf/bpf_tracing.h @@ -457,4 +457,19 @@ static __always_inline typeof(name(0)) ____##name(struct pt_regs *ctx, ##args) ___ret; \ }) +/* + * BPF_SNPRINTF wraps the bpf_snprintf helper with variadic arguments instead of + * an array of u64. + */ +#define BPF_SNPRINTF(out, out_size, fmt, args...) \ + ({ \ + _Pragma("GCC diagnostic push") \ + _Pragma("GCC diagnostic ignored \"-Wint-conversion\"") \ + ___bpf_build_param(args); \ + _Pragma("GCC diagnostic pop") \ + int ___ret = bpf_snprintf(out, out_size, fmt, \ + ___param, sizeof(___param)); \ + ___ret; \ + }) + #endif -- 2.30.1.766.gb4fecdf3b7-goog
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