t.Errorf("Fchmodat: failed to change mode: expected %v, got %v", 0444, fi.Mode())
	}

	err = syscall.Fchmodat(_AT_FDCWD, "symlink1", 0444, _AT_SYMLINK_NOFOLLOW)
	if err != syscall.EOPNOTSUPP {
		t.Fatalf("Fchmodat: unexpected error: %v, expected EOPNOTSUPP", err)
	}
}

func TestMain(m *testing.M) {
	if os.Getenv("GO_DEATHSIG_PARENT") == "1" {
		deathSignalParent()
	} else if os.Getenv("GO_DEATHSIG_CHILD") == "1" {

	case oserror.ErrExist:
		return e == EEXIST || e == ENOTEMPTY
	case oserror.ErrNotExist:
		return e == ENOENT
	case errorspkg.ErrUnsupported:
		return e == ENOSYS || e == ENOTSUP || e == EOPNOTSUPP
	}
	return false
}

func (e Errno) Temporary() bool {
	return e == EINTR || e == EMFILE || e == ENFILE || e.Timeout()
}

func (e Errno) Timeout() bool {

	ENOTNAM         = syscall.Errno(0x76)
	ENOTRECOVERABLE = syscall.Errno(0x83)
	ENOTSOCK        = syscall.Errno(0x58)
	ENOTSUP         = syscall.Errno(0x5f)
	ENOTUNIQ        = syscall.Errno(0x4c)
	EOPNOTSUPP      = syscall.Errno(0x5f)
	EOVERFLOW       = syscall.Errno(0x4b)
	EOWNERDEAD      = syscall.Errno(0x82)
	EPFNOSUPPORT    = syscall.Errno(0x60)
	EPROTO          = syscall.Errno(0x47)

	ENOTNAM         = syscall.Errno(0x76)
	ENOTRECOVERABLE = syscall.Errno(0x83)
	ENOTSOCK        = syscall.Errno(0x58)
	ENOTSUP         = syscall.Errno(0x5f)
	ENOTUNIQ        = syscall.Errno(0x4c)
	EOPNOTSUPP      = syscall.Errno(0x5f)
	EOVERFLOW       = syscall.Errno(0x4b)
	EOWNERDEAD      = syscall.Errno(0x82)
	EPFNOSUPPORT    = syscall.Errno(0x60)
	EPROTO          = syscall.Errno(0x47)

	ENOTNAM         = syscall.Errno(0x76)
	ENOTRECOVERABLE = syscall.Errno(0x83)
	ENOTSOCK        = syscall.Errno(0x58)
	ENOTSUP         = syscall.Errno(0x5f)
	ENOTUNIQ        = syscall.Errno(0x4c)
	EOPNOTSUPP      = syscall.Errno(0x5f)
	EOVERFLOW       = syscall.Errno(0x4b)
	EOWNERDEAD      = syscall.Errno(0x82)
	EPFNOSUPPORT    = syscall.Errno(0x60)
	EPROTO          = syscall.Errno(0x47)

		if err == ENOSYS {
			// fchmodat2 isn't available. If the flags are known to be valid,
			// return EOPNOTSUPP to indicate that fchmodat doesn't support them.
			if flags&^(_AT_SYMLINK_NOFOLLOW|_AT_EMPTY_PATH) != 0 {
				return EINVAL
			} else if flags&(_AT_SYMLINK_NOFOLLOW|_AT_EMPTY_PATH) != 0 {
				return EOPNOTSUPP
			}
		}
		return err
	}
	return fchmodat(dirfd, path, mode)
}

	EDESTADDRREQ       = Errno(1106)
	EMSGSIZE           = Errno(1107)
	EPROTOTYPE         = Errno(1108)
	ENOPROTOOPT        = Errno(1109)
	EPROTONOSUPPORT    = Errno(1110)
	ESOCKTNOSUPPORT    = Errno(1111)
	EOPNOTSUPP         = Errno(1112)
	EPFNOSUPPORT       = Errno(1113)
	EAFNOSUPPORT       = Errno(1114)
	EADDRINUSE         = Errno(1115)
	EADDRNOTAVAIL      = Errno(1116)
	ENETDOWN           = Errno(1117)