Function openssl_sys::SSL_CTX_set_alpn_select_cb

pub unsafe extern fn SSL_CTX_set_alpn_select_cb(
    ssl: *mut SSL_CTX, 
    cb: extern fn(_: *mut SSL, _: *mut *const c_uchar, _: *mut c_uchar, _: *const c_uchar, _: c_uint, _: *mut c_void) -> c_int, 
    arg: *mut c_void
)