//sys	Rename(from string, to string) (err error)
//sys	Rmdir(path string) (err error)
//sys	Seek(fd int, offset int64, whence int) (newoffset int64, err error) = lseek
//sys	sendfile(outfd int, infd int, offset *int64, count int) (written int, err error) = libsendfile.sendfile
//sysnb	Setegid(egid int) (err error)
//sysnb	Seteuid(euid int) (err error)
//sysnb	Setgid(gid int) (err error)
//sysnb	Setpgid(pid int, pgid int) (err error)

	var ts *Timespec
	if timeout != nil {
		ts = &Timespec{Sec: timeout.Sec, Nsec: timeout.Usec * 1000}
	}
	return pselect6(nfd, r, w, e, ts, nil)
}

//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)
//sys	Shutdown(fd int, how int) (err error)

	return &TCPAddr{loopbackIP(net), a.Port, a.Zone}
}

func (c *TCPConn) readFrom(r io.Reader) (int64, error) {
	if n, err, handled := spliceFrom(c.fd, r); handled {
		return n, err
	}
	if n, err, handled := sendFile(c.fd, r); handled {
		return n, err
	}
	return genericReadFrom(c, r)
}

func (c *TCPConn) writeTo(w io.Writer) (int64, error) {
	if n, err, handled := spliceTo(w, c.fd); handled {
		return n, err
	}

//sys	Renameat(olddirfd int, oldpath string, newdirfd int, newpath string) (err error)
//sys	Seek(fd int, offset int64, whence int) (off int64, err error) = SYS_LSEEK
//sys	sendfile(outfd int, infd int, offset *int64, count int) (written int, err error)
//sys	Setfsgid(gid int) (err error)
//sys	Setfsuid(uid int) (err error)
//sysnb	setrlimit(resource int, rlim *Rlimit) (err error) = SYS_SETRLIMIT

	if len(fds) == 0 {
		return poll(nil, 0, timeout)
	}
	return poll(&fds[0], len(fds), timeout)
}

func Sendfile(outfd int, infd int, offset *int64, count int) (written int, err error) {
	if raceenabled {
		raceReleaseMerge(unsafe.Pointer(&ioSync))
	}
	return sendfile(outfd, infd, offset, count)
}

/*
 * Exposed directly
 */
//sys	Access(path string, mode uint32) (err error)

//sys getdents(fd int, buf []byte) (n int, err error)

func Getdirentries(fd int, buf []byte, basep *uintptr) (n int, err error) {
	return getdents(fd, buf)
}

// TODO, see golang.org/issue/5847
func sendfile(outfd int, infd int, offset *int64, count int) (written int, err error) {
	return -1, ENOSYS
}

/*
 * Exposed directly
 */
//sys	Access(path string, mode uint32) (err error)

//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) (err error)
//sys	Setfsuid(uid int) (err error)
//sysnb	setrlimit(resource int, rlim *Rlimit) (err error) = SYS_SETRLIMIT

//sys	Renameat(olddirfd int, oldpath string, newdirfd int, newpath string) (err error) = SYS_RENAMEAT2
//sys	Seek(fd int, offset int64, whence int) (off int64, err error) = SYS_LSEEK
//sys	sendfile(outfd int, infd int, offset *int64, count int) (written int, err error)
//sys	Setfsgid(gid int) (err error)
//sys	Setfsuid(uid int) (err error)
//sys	Shutdown(fd int, how int) (err error)

	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