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(ssl: *mut SSL, out: *mut *const c_uchar, outlen: *mut c_uchar, inbuf: *const c_uchar, inlen: c_uint, arg: *mut c_void) -> c_int, arg: *mut c_void)