Function check

crates/openshell-driver-vm/src/runtime.rs:1364–1370

(ret: i32, func: &'static str)

}

fn check(ret: i32, func: &'static str) -> Result<(), String> {
    if ret < 0 {
        Err(format!("{func} failed with error code {ret}"))
    } else {
        Ok(())
    }
}

fn c_string_array(strings: &[&str]) -> Result<(Vec<CString>, Vec<*const libc::c_char>), String> {
    let owned: Vec<CString> = strings