Function openssl_sys::SSL_CTX_add_custom_ext
pub unsafe extern "C" fn SSL_CTX_add_custom_ext(ctx: *mut ::SSL_CTX, ext_type: c_uint, context: c_uint, add_cb: SSL_custom_ext_add_cb_ex, free_cb: SSL_custom_ext_free_cb_ex, add_arg: *mut c_void, parse_cb: SSL_custom_ext_parse_cb_ex, parse_arg: *mut c_void) -> c_int
The portability is definied by:
#[cfg(ossl111)]