res.Body.Close()

	// Force child to exit cleanly.
	Post(fmt.Sprintf("http://%s/quit", ln.Addr()), "", nil)
	child.Wait()

	rx := regexp.MustCompile(`\b(n64:)?sendfile(64)?\(`)
	out := buf.String()
	if !rx.MatchString(out) {
		t.Errorf("no sendfile system call found in:\n%s", out)
	}
}

func getBody(t *testing.T, testName string, req Request, client *Client) (*Response, []byte) {
	r, err := client.Do(&req)

//sys	pwrite(fd int, p []byte, offset int64) (n int, err error) = SYS_PWRITE64
//sys	Renameat(olddirfd int, oldpath string, newdirfd int, newpath string) (err error)
//sys	sendfile(outfd int, infd int, offset *int64, count int) (written int, err error) = SYS_SENDFILE64
//sys	setfsgid(gid int) (prev int, err error) = SYS_SETFSGID32
//sys	setfsuid(uid int) (prev int, err error) = SYS_SETFSUID32

//sys	Seek(fd int, offset int64, whence int) (off int64, err error) = SYS_LSEEK
//sys	Select(nfd int, r *FdSet, w *FdSet, e *FdSet, timeout *Timeval) (n int, err error)
//sys	sendfile(outfd int, infd int, offset *int64, count int) (written int, err error)
//sys	setfsgid(gid int) (prev int, err error)
//sys	setfsuid(uid int) (prev int, err error)

	// be interpreted as being cause for termination.
	if pid > 0 && pid != Getpid() {
		return ESRCH
	}
	ProcExit(128 + int32(signum))
	return nil
}

func Sendfile(outfd int, infd int, offset *int64, count int) (written int, err error) {
	return 0, ENOSYS
}

func StartProcess(argv0 string, argv []string, attr *ProcAttr) (pid int, handle uintptr, err error) {
	return 0, 0, ENOSYS

                    def relativePath = request.pathInfo.substring(path.length() + 1)
                    file = new File(srcFile, relativePath)
                }
                if (file.isFile()) {
                    sendFile(response, file, null, null, interaction.contentType)
                } else if (file.isDirectory()) {
                    sendDirectoryListing(response, file)
                } else {

//sys	pwrite(fd int, p []byte, offset int64) (n int, err error) = SYS_PWRITE64
//sys	Renameat(olddirfd int, oldpath string, newdirfd int, newpath string) (err error)
//sys	sendfile(outfd int, infd int, offset *int64, count int) (written int, err error) = SYS_SENDFILE64
//sys	Setfsgid(gid int) (err error) = SYS_SETFSGID32
//sys	Setfsuid(uid int) (err error) = SYS_SETFSUID32

		// Attempt to use splice/sendfile() optimization, A very specific behavior mentioned below is necessary.
		// See https://github.com/golang/go/blob/f7c5cbb82087c55aa82081e931e0142783700ce8/src/net/sendfile_linux.go#L20
		// Windows can lock up with this optimization, so we fall back to regular copy.
		sr, ok := rc.(*sendFileReader)
		if ok {
			// Sendfile sends in 4MiB chunks per sendfile syscall which is more than enough

        /**
         * Sends a 200 response with the contents of the given file as the response body.
         *
         * @return this
         */
        BuildableExpectedRequest sendFile(File file);

        /**
         * Sends a 200 response with the given text (UTF-8 encoded) as the response body.
         *
         * @return this
         */

	if e1 != 0 {
		err = errnoErr(e1)
	}
	return
}

// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT

func sendfile(outfd int, infd int, offset *int64, count int) (written int, err error) {
	r0, _, e1 := Syscall6(SYS_SENDFILE64, uintptr(outfd), uintptr(infd), uintptr(unsafe.Pointer(offset)), uintptr(count), 0, 0)
	written = int(r0)

	n = int(r0)
	if e1 != 0 {
		err = errnoErr(e1)
	}
	return
}

// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT

func sendfile(outfd int, infd int, offset *int64, count int) (written int, err error) {
	r0, _, e1 := Syscall6(SYS_SENDFILE, uintptr(outfd), uintptr(infd), uintptr(unsafe.Pointer(offset)), uintptr(count), 0, 0)
	written = int(r0)
	if e1 != 0 {