// with mode 0o777 mkdir honors system umask.
	mkdirAll(pathutil.Dir(filePath), 0o777, s.drivePath) // don't need to fail here

	w, err := s.openFileDirect(filePath, os.O_CREATE|os.O_WRONLY|os.O_EXCL)
	if err != nil {
		return err
	}
	_, err = w.Write(alignedBuf)
	w.Close()
	if err != nil {
		if isSysErrInvalidArg(err) {
			err = errUnsupportedDisk
		}
	}
	return err
}

	WSAENOPROTOOPT            Errno = 10042
	WSAECONNABORTED           Errno = 10053
	WSAECONNRESET             Errno = 10054
)

const (
	// Invented values to support what package os expects.
	O_RDONLY   = 0x00000
	O_WRONLY   = 0x00001
	O_RDWR     = 0x00002
	O_CREAT    = 0x00040
	O_EXCL     = 0x00080
	O_NOCTTY   = 0x00100
	O_TRUNC    = 0x00200
	O_NONBLOCK = 0x00800
	O_APPEND   = 0x00400
	O_SYNC     = 0x01000

}

func Chown(path string, uid int, gid int) (err error) {
	return Fchownat(AT_FDCWD, path, uid, gid, 0)
}

func Creat(path string, mode uint32) (fd int, err error) {
	return Open(path, O_CREAT|O_WRONLY|O_TRUNC, mode)
}

//sys	utimes(path string, times *[2]Timeval) (err error)

func Utimes(path string, tv []Timeval) error {
	if len(tv) != 2 {
		return EINVAL
	}

		// we need to ensure that only the temporary copy is affected.
		s, err := os.Open(src)
		if err != nil {
			return err
		}
		defer s.Close()
		d, err := os.OpenFile(dst, os.O_WRONLY|os.O_CREATE|os.O_EXCL, perm)
		if err != nil {
			return err
		}
		_, err = io.Copy(d, s)
		if err != nil {
			d.Close()
			return err
		}
		return d.Close()
	})
	if err != nil {

		AssertNotRebuilt(t, "new .a file", target)
		AssertRebuilt(t, "new .a file", shlib)
	})
}

func appendFile(t *testing.T, path, content string) {
	t.Helper()
	f, err := os.OpenFile(path, os.O_WRONLY|os.O_APPEND, 0660)
	if err != nil {
		t.Fatalf("os.OpenFile failed: %v", err)
	}
	defer func() {
		err := f.Close()
		if err != nil {
			t.Fatalf("f.Close failed: %v", err)
		}
	}()

	src, err := os.Open(os.Args[0])
	if err != nil {
		t.Fatalf("cannot open binary %q, %v", os.Args[0], err)
	}
	defer src.Close()

	dst, err := os.OpenFile(tmpBinary, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0755)
	if err != nil {
		t.Fatalf("cannot create temporary binary %q, %v", tmpBinary, err)
	}
	if _, err := io.Copy(dst, src); err != nil {

			panic(msg)
		}
	}
	file := c.fileName(id, "a")

	// Copy file to cache directory.
	mode := os.O_WRONLY | os.O_CREATE
	f, err := os.OpenFile(file, mode, 0666)
	if err != nil {
		return err
	}
	_, err = f.WriteString(entry)
	if err == nil {
		// Truncate the file only *after* writing it.

	O_NONBLOCK                      = 0x04
	O_RDONLY                        = 0x02
	O_RDWR                          = 0x03
	O_SYNC                          = 0x0100
	O_TRUNC                         = 0x10
	O_WRONLY                        = 0x01
	O_NOCTTY                        = 0x20
	OPOST                           = 0x0001
	ONLCR                           = 0x0004
	PARENB                          = 0x0200

		})
	}
	return containerPorts
}

func customizeVMEnvironment(ctx resource.Context, cfg echo.Config, clusterEnv string, istiodAddr netip.AddrPort) error {
	f, err := os.OpenFile(clusterEnv, os.O_APPEND|os.O_WRONLY, os.ModeAppend)
	if err != nil {
		return fmt.Errorf("failed opening %s: %v", clusterEnv, err)
	}
	defer f.Close()

	if cfg.VMEnvironment != nil {
		for k, v := range cfg.VMEnvironment {

	O_SEARCH                      = 0x200000
	O_SIOCGIFCONF                 = -0x3ff796ec
	O_SIOCGLIFCONF                = -0x3fef9688
	O_SYNC                        = 0x10
	O_TRUNC                       = 0x200
	O_WRONLY                      = 0x1
	O_XATTR                       = 0x4000
	PARENB                        = 0x100
	PAREXT                        = 0x100000
	PARMRK                        = 0x8