// For example:
//
//	_, _, err := syscall.Syscall(...)
//	if errors.Is(err, fs.ErrNotExist) ...
type Errno uintptr

func (e Errno) Error() string {
	if 0 <= int(e) && int(e) < len(errorstr) {
		s := errorstr[e]
		if s != "" {
			return s
		}
	}
	return "errno " + itoa.Itoa(int(e))
}

func (e Errno) Is(target error) bool {
	switch target {
	case oserror.ErrPermission:

//
//	var err = nil
//	if errno != 0 {
//		err = errno
//	}
type Errno uint32

func (e Errno) Error() string {
	if 0 <= int(e) && int(e) < len(errorstr) {
		s := errorstr[e]
		if s != "" {
			return s
		}
	}
	return "errno " + itoa.Itoa(int(e))
}

func (e Errno) Is(target error) bool {
	switch target {
	case oserror.ErrPermission:

	EXDEV           Errno = 75
	ENOTCAPABLE     Errno = 76
	// needed by src/net/error_unix_test.go
	EOPNOTSUPP = ENOTSUP
)

// TODO: Auto-generate some day. (Hard-coded in binaries so not likely to change.)
var errorstr = [...]string{
	E2BIG:           "Argument list too long",
	EACCES:          "Permission denied",
	EADDRINUSE:      "Address already in use",
	EADDRNOTAVAIL:   "Address not available",