libressl-SSL_set_bio(3)

libressl-SSL_set_bio3

Connect the ssl object with a bio

Usage

SSL Library (libssl, -lssl) libcrypto

#include <openssl/ssl.h>

void

SSL_set_bio(SSL *ssl, BIO *rbio, BIO *wbio);

Overview

SSL_set_bio() connects theBIO s rbio and wbio for the read and write operations of the TLS/SSL (encrypted) side of ssl.

The SSL engine inherits the behaviour of rbio and wbio, respectively. If a BIO is non-blocking, the ssl will also have non-blocking behaviour.

If there was already a BIO connected to ssl, BIO_free(3) will be called (for both the reading and writing side, if different).

History

SSL_set_bio() first appeared in SSLeay 0.6.0 and has been available since OpenBSD 2.4.

From libressl 4.4.0-1 in Arch Linux 2026-11-01. Parsed by carta from the page's mdoc source.