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 <rev...@chromium.org>
---
tools/lib/bpf/bpf_tracing.h | 18 ++++++++++++++++++
1 file changed, 18 insertions(+)
diff --git a/tools/lib/bpf/bpf_tracing.h b/tools/lib/bpf/bpf_tracing.h
index d9a4c3f77ff4..e5c6ede6060b 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)
__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\"") \
+ unsigned long long ___param[___bpf_narg(args)]; \
+ static const char ___fmt[] = fmt; \
+ int __ret; \
+ ___bpf_fill(___param, args); \
+ _Pragma("GCC diagnostic pop") \
+ __ret = bpf_snprintf(out, out_size, ___fmt, \
+ ___param, sizeof(___param)); \
+ __ret; \
+ })
+
#endif
--
2.31.0.291.g576ba9dcdaf-goog
