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authorFlorent Revest <revest@chromium.org>2021-04-19 17:52:42 +0200
committerAlexei Starovoitov <ast@kernel.org>2021-04-19 15:27:37 -0700
commit58c2b1f5e0121efd698b6ec8e45e47e58ca9caee (patch)
tree475dde78e141faf599494af6e047d4fa17fe1435 /tools/lib/bpf
parent83cd92b46484aa8f64cdc0bff8ac6940d1f78519 (diff)
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: 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
Diffstat (limited to 'tools/lib/bpf')
-rw-r--r--tools/lib/bpf/bpf_tracing.h18
1 files changed, 18 insertions, 0 deletions
diff --git a/tools/lib/bpf/bpf_tracing.h b/tools/lib/bpf/bpf_tracing.h
index 1c2e91ee041d..8c954ebc0c7c 100644
--- a/tools/lib/bpf/bpf_tracing.h
+++ b/tools/lib/bpf/bpf_tracing.h
@@ -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