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SSL_GET_RBIO(3) Library Functions Manual SSL_GET_RBIO(3)

SSL_get_rbio, SSL_get_wbio —
get BIO linked to an SSL object

#include <openssl/ssl.h>

BIO *
SSL_get_rbio(SSL *ssl);

BIO *
SSL_get_wbio(SSL *ssl);

SSL_get_rbio() and SSL_get_wbio() return pointers to the BIOs for the read or the write channel, which can be different. The reference count of the BIO is not incremented.

The following return values can occur:
No BIO was connected to the SSL object.
Any other pointer
The BIO linked to ssl.

BIO_new(3), ssl(3), SSL_set_bio(3)

SSL_get_rbio() and SSL_get_wbio() first appeared in SSLeay 0.6.0 and have been available since OpenBSD 2.4.
March 27, 2018 OpenBSD-current