sysattr.Files = append(sysattr.Files, f.Fd())
	}

	pid, _, e := syscall.StartProcess(name, argv, sysattr)
	if e != nil {
		return nil, &PathError{Op: "fork/exec", Path: name, Err: e}
	}

	return newPIDProcess(pid), nil
}

func (p *Process) writeProcFile(file string, data string) error {
	f, e := OpenFile("/proc/"+itoa.Itoa(p.Pid)+"/"+file, O_WRONLY, 0)
	if e != nil {
		return e
	}
	defer f.Close()

	}

	// For Windows, syscall.StartProcess above already returned a process handle.
	if runtime.GOOS != "windows" {
		var ok bool
		h, ok = getPidfd(sysattr.Sys)
		if !ok {
			return newPIDProcess(pid), nil
		}
	}

	return newHandleProcess(pid, h), nil
}

func (p *Process) kill() error {
	return p.Signal(Kill)
}

// ProcessState stores information about a process, as reported by Wait.

		return newDoneProcess(pid), nil
	} else if err != nil {
		// Ignore other errors from pidfdFind, as the callers
		// do not expect them. Fall back to using the PID.
		return newPIDProcess(pid), nil
	}
	// Use the handle.
	return newHandleProcess(pid, h), nil
}

func (p *ProcessState) userTime() time.Duration {
	return time.Duration(p.rusage.Utime.Nano()) * time.Nanosecond
}

	// (or during closeHandle), not directly! handle is immutable.
	//
	// On Windows, it is a handle from OpenProcess.
	// On Linux, it is a pidfd.
	// It is unused on other GOOSes.
	handle uintptr
}

func newPIDProcess(pid int) *Process {
	p := &Process{
		Pid:  pid,
		mode: modePID,
	}
	runtime.SetFinalizer(p, (*Process).Release)
	return p
}

func newHandleProcess(pid int, handle uintptr) *Process {