Function execve

crates/vm/src/stdlib/posix.rs:1319–1365

(
        path: OsPath,
        argv: Either<PyListRef, PyTupleRef>,
        env: ArgMapping,
        vm: &VirtualMachine,
    )

    #[pyfunction]
    fn execve(
        path: OsPath,
        argv: Either<PyListRef, PyTupleRef>,
        env: ArgMapping,
        vm: &VirtualMachine,
    ) -> PyResult<()> {
        let path = path.into_cstring(vm)?;

        let argv = vm.extract_elements_with(argv.as_ref(), |obj| {
            OsPath::try_from_object(vm, obj)?.into_cstring(vm)
        })?;
        let argv: Vec<&CStr> = argv.iter().map(|entry| entry.as_c_str()).collect();

        let first = argv
            .first()
            .ok_or_else(|| vm.new_value_error("execve() arg 2 must not be empty"))?;

        if first.to_bytes().is_empty() {
            return Err(vm.new_value_error("execve() arg 2 first element cannot be empty"));
        }

        let env = crate::stdlib::os::envobj_to_dict(env, vm)?;
        let env = env
            .into_iter()
            .map(|(k, v)| -> PyResult<_> {
                let (key, value) = (
                    OsPath::try_from_object(vm, k)?.into_bytes(),
                    OsPath::try_from_object(vm, v)?.into_bytes(),
                );

                if key.is_empty() || memchr::memchr(b'=', &key).is_some() {
                    return Err(vm.new_value_error("illegal environment variable name"));
                }

                let mut entry = key;
                entry.push(b'=');
                entry.extend_from_slice(&value);

                CString::new(entry).map_err(|err| err.into_pyexception(vm))
            })
            .collect::<Result<Vec<_>, _>>()?;

        let env: Vec<&CStr> = env.iter().map(|entry| entry.as_c_str()).collect();

        unistd::execve(&path, &argv, &env).map_err(|err| err.into_pyexception(vm))?;
        Ok(())
    }

    #[pyfunction]
    fn getppid(vm: &VirtualMachine) -> PyObjectRef {