https://www.mirrorservice.org/sites/sourceware.org/pub/cygwin/x86_64/release/rbio/librbio1/?C=S;O=A
Index of /sites/sourceware.org/pub/cygwin/x86_64/release/rbio/librbio1
index of
https://docs.openssl.org/3.4/man3/SSL_get_rbio/
SSL_get_rbio - OpenSSL Documentation
sslgetdocumentation