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libbpf: Introduce a BPF_SNPRINTF helper macro

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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>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20210419155243.1632274-6-revest@chromium.org
This commit is contained in:
Florent Revest 2021-04-19 17:52:42 +02:00 committed by Alexei Starovoitov
parent 83cd92b464
commit 58c2b1f5e0
1 changed files with 18 additions and 0 deletions
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18
tools/lib/bpf/bpf_tracing.h
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@ -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