Commit 58c2b1f5 authored by Florent Revest's avatar Florent Revest Committed by Alexei Starovoitov
Browse files

libbpf: Introduce a BPF_SNPRINTF helper macro 



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: default avatarFlorent Revest <revest@chromium.org>
Signed-off-by: default avatarAlexei Starovoitov <ast@kernel.org>
Acked-by: default avatarAndrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20210419155243.1632274-6-revest@chromium.org
parent 83cd92b4

tools/lib/bpf/bpf_tracing.h

+18 −0
Original line number Diff line number Diff line
@@ -447,4 +447,22 @@ static __always_inline typeof(name(0)) ____##name(struct pt_regs *ctx, ##args) 
		       ___param, sizeof(___param));		\

})



/*

 * BPF_SNPRINTF wraps the bpf_snprintf helper with variadic arguments instead of

 * an array of u64.

 */

#define BPF_SNPRINTF(out, out_size, fmt, args...)		\

({								\

	static const char ___fmt[] = fmt;			\

	unsigned long long ___param[___bpf_narg(args)];		\

								\

	_Pragma("GCC diagnostic push")				\

	_Pragma("GCC diagnostic ignored \"-Wint-conversion\"")	\

	___bpf_fill(___param, args);				\

	_Pragma("GCC diagnostic pop")				\

								\

	bpf_snprintf(out, out_size, ___fmt,			\

		     ___param, sizeof(___param));		\

})



#endif