Legacy BIO callback invoked immediately before and after I/O operations (deprecated).
Synopsis
Declared in <openssl/bio.h>
typedef long(* BIO_callback_fn)(BIO*, int, char const*, int, long, long);Return Value
Post‐call return value (usually ret unchanged).
Parameters
Name |
Description |
b |
BIO performing the operation. |
oper |
BIO_CB_* operation code OR'd with BIO_CB_RETURN after the call. |
argp |
Pointer argument (buffer or ctrl pointer), or NULL. |
argi |
Integer argument for ctrl‐style operations. |
argl |
Long argument for ctrl‐style operations. |
ret |
Return value from the underlying operation (post‐call only). |
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