cmdOffset := unsafe.Sizeof(exem.FileHeader)
	if is64bit := exem.Magic == macho.Magic64; is64bit {
		// mach_header_64 has one extra uint32.
		cmdOffset += unsafe.Sizeof(exem.Magic)
	}
	if _, err := outf.Seek(int64(cmdOffset), 0); err != nil {
		return err
	}

	// Read the load commands, looking for the LC_UUID cmd. If/when we
	// locate it, overwrite it with a new value produced by
	// uuidFromGoBuildId.

	return syscall10X(fn, a1, a2, a3, a4, a5, a6, a7, a8, a9, 0)
}

//sys	readlen(fd int, buf *byte, nbuf int) (n int, err error) = SYS_read
//sys	Seek(fd int, offset int64, whence int) (newoffset int64, err error) = SYS_lseek
//sys	getcwd(buf []byte) (n int, err error)
//sys	sysctl(mib []_C_int, old *byte, oldlen *uintptr, new *byte, newlen uintptr) (err error)

	if _, err := f.Write(data); err != nil {
		t.Fatalf("failed to create and feed the file: %v", err)
	}
	if err := f.Sync(); err != nil {
		t.Fatalf("failed to save the file: %v", err)
	}
	if _, err := f.Seek(0, io.SeekStart); err != nil {
		t.Fatalf("failed to rewind the file: %v", err)
	}

	return f, data

	type opaResult struct {
		Result bool `json:"result"`
	}

	respBody := bytes.NewReader(opaRespBytes)

	var result opaResult
	if err = json.NewDecoder(respBody).Decode(&result); err != nil {
		respBody.Seek(0, 0)
		var resultAllow opaResultAllow
		if err = json.NewDecoder(respBody).Decode(&resultAllow); err != nil {
			return false, err
		}
		return resultAllow.Result.Allow, nil
	}

	return result.Result, nil

	type opaResult struct {
		Result bool `json:"result"`
	}

	respBody := bytes.NewReader(opaRespBytes)

	var result opaResult
	if err = json.NewDecoder(respBody).Decode(&result); err != nil {
		respBody.Seek(0, 0)
		var resultAllow opaResultAllow
		if err = json.NewDecoder(respBody).Decode(&resultAllow); err != nil {
			return false, err
		}
		return resultAllow.Result.Allow, nil
	}

	return result.Result, nil

	r := bytes.NewReader(buf)

	off, length := int64(0), r.Size()
	if rs != nil {
		off, length, err = rs.GetOffsetLength(r.Size())
		if err != nil {
			return nil, err
		}
	}
	r.Seek(off, io.SeekStart)

	return NewGetObjectReaderFromReader(io.LimitReader(r, length), ObjectInfo{
		Bucket:      bucket,
		Name:        object,
		Size:        r.Size(),
		IsLatest:    true,

		found := false
		for _, err := range errs {
			if strings.HasPrefix(err.Error(), str) {
				found = true
				break
			}
		}
		if !found {
			t.Errorf("did not find error %q", str)
			t.Logf("\tseek: %s\n\t  in:", str)
			for _, err := range errs {
				t.Logf("\t      %s", err.Error())
			}
		}
	}
}

func TestSimpleForward(t *testing.T) {
	pkgs, err := loadPkgs("./testdata/simple-fwd/aaa")

			fmt.Printf("%s\n", file)
		}

		f, err := os.Open(file)
		if err != nil {
			log.Fatal(err)
		}
		aro, err := archive.Parse(f, false)
		if err != nil || !isGoCompilerObjFile(aro) {
			f.Seek(0, io.SeekStart)
			ar.addFile(f)
			goto close
		}

		for _, e := range aro.Entries {
			if e.Type != archive.EntryGoObj || e.Name != "_go_.o" {
				continue
			}