[#BIO_dump_cb]
= BIO_dump_cb
:mrdocs:

Hex‐dump `len` bytes at `s` by invoking `cb` for each formatted chunk.

== Synopsis

Declared in `<openssl/bio.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
BIO_dump_cb(
    int(* cb)(void const*, size_t, void*),
    void* u,
    void const* s,
    int len);
----

== Return Value

1 on success, or 0 on error / callback abort.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *cb*
| Callback receiving dump text; return <=0 to abort.
| *u*
| Opaque user pointer forwarded to `cb.`
| *s*
| Bytes to dump.
| *len*
| Number of bytes at `s.`
|===


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