ECHILD      = syscall.Errno(0xa)
	EDOM        = syscall.Errno(0x21)
	EEXIST      = syscall.Errno(0x11)
	EFAULT      = syscall.Errno(0xe)
	EFBIG       = syscall.Errno(0x1b)
	EINTR       = syscall.Errno(0x4)
	EINVAL      = syscall.Errno(0x16)
	EIO         = syscall.Errno(0x5)
	EISDIR      = syscall.Errno(0x15)
	EMFILE      = syscall.Errno(0x18)
	EMLINK      = syscall.Errno(0x1f)
	ENFILE      = syscall.Errno(0x17)

// Errno values.
const (
	errnoERROR_IO_PENDING = 997
)

var (
	errERROR_IO_PENDING error = syscall.Errno(errnoERROR_IO_PENDING)
	errERROR_EINVAL     error = syscall.EINVAL
)

// errnoErr returns common boxed Errno values, to prevent
// allocations at runtime.
func errnoErr(e syscall.Errno) error {
	switch e {
	case 0:
		return errERROR_EINVAL
	case errnoERROR_IO_PENDING: