if d == 0 {
		d = defaultTCPKeepAliveIdle
	} else if d < 0 {
		return nil
	}

	// The kernel expects seconds so round to next highest second.
	secs := int(roundDurationUp(d, time.Second))
	err := fd.pfd.SetsockoptInt(syscall.IPPROTO_TCP, syscall.TCP_KEEPALIVE, secs)
	runtime.KeepAlive(fd)
	return wrapSyscallError("setsockopt", err)
}

func setKeepAliveInterval(fd *netFD, d time.Duration) error {
	if d == 0 {

func PtraceGetRegs386(pid int, regsout *PtraceRegs386) error {
	return ptracePtr(PTRACE_GETREGS, pid, 0, unsafe.Pointer(regsout))
}

// PtraceSetRegs386 sets the registers used by 386 binaries.
func PtraceSetRegs386(pid int, regs *PtraceRegs386) error {
	return ptracePtr(PTRACE_SETREGS, pid, 0, unsafe.Pointer(regs))
}

// PtraceRegsAmd64 is the registers used by amd64 binaries.
type PtraceRegsAmd64 struct {
	R15      uint64
	R14      uint64

}

// PtraceSetRegsMips sets the registers used by mips binaries.
func PtraceSetRegsMips(pid int, regs *PtraceRegsMips) error {
	return ptracePtr(PTRACE_SETREGS, pid, 0, unsafe.Pointer(regs))
}

// PtraceRegsMips64 is the registers used by mips64 binaries.
type PtraceRegsMips64 struct {
	Regs     [32]uint64
	Lo       uint64
	Hi       uint64
	Epc      uint64
	Badvaddr uint64

		if e.ID != vid {
			continue
		}
		if e.regs[0] == r {
			// Already known and highest priority
			return
		}
		for j := 1; j < len(e.regs); j++ {
			if e.regs[j] == r {
				// Move from lower priority to top priority
				copy(e.regs[1:], e.regs[:j])
				e.regs[0] = r
				return
			}
		}
		copy(e.regs[1:], e.regs[:])
		e.regs[0] = r
		return
	}

	}

	// If seconds is negative, then perform correction.
	sign := ""
	if secs < 0 {
		sign = "-"             // Remember sign
		secs = -(secs + 1)     // Add a second to secs
		nsecs = -(nsecs - 1e9) // Take that second away from nsecs
	}
	return strings.TrimRight(fmt.Sprintf("%s%d.%09d", sign, secs, nsecs), "0")
}

// parsePAXRecord parses the input PAX record string into a key-value pair.

	STMG	R6, R15, 48(R15)		// Save non-volatile regs.
	BL	runtime·load_g(SB)		// Saved by racecall.
	CMPBNE	R2, $0, rest			// raceGetProcCmd?
	MOVD	g_m(g), R2			// R2 = thread.
	MOVD	m_p(R2), R2			// R2 = processor.
	MVC	$8, p_raceprocctx(R2), (R3)	// *R3 = ThreadState *.
	LMG	48(R15), R6, R15		// Restore non-volatile regs.
	BR	R14				// Return to C.
rest:	MOVD	g_m(g), R4			// R4 = current thread.

        then:
        timer.getElapsed() == "51.243 secs"
    }

    def testOnlySecondsEvenMs() {
        when:
        setTime(4000)

        then:
        timer.getElapsed() == "4.0 secs"
    }

    def testMinutesAndSeconds() {
        when:
        setTime(0, 32, 40, 322)

        then:
        timer.getElapsed() == "32 mins 40.322 secs"
    }

    def testHoursMinutesAndSeconds() {

	if d == 0 {
		d = defaultTCPKeepAliveIdle
	} else if d < 0 {
		return nil
	}

	// The kernel expects seconds so round to next highest second.
	secs := int(roundDurationUp(d, time.Second))
	err := fd.pfd.SetsockoptInt(syscall.IPPROTO_TCP, syscall.TCP_KEEPIDLE, secs)
	runtime.KeepAlive(fd)
	return wrapSyscallError("setsockopt", err)
}

func setKeepAliveInterval(fd *netFD, d time.Duration) error {
	if d == 0 {

// (in decreasing preference) that can be used to represent name.
func shortNameList(name string) []string {
	name = graph.ShortenFunctionName(name)
	seps := sepRE.FindAllStringIndex(name, -1)
	result := make([]string, 0, len(seps)+1)
	result = append(result, name)
	for _, sep := range seps {
		// Suffix starting just after sep
		if sep[1] < len(name) {
			result = append(result, name[sep[1]:])
		}
	}
	return result

	return ptracePtr(PTRACE_GETREGSET, pid, uintptr(addr), unsafe.Pointer(&iovec))
}

// PtraceSetRegSetArm64 sets the registers used by arm64 binaries.
func PtraceSetRegSetArm64(pid, addr int, regs *PtraceRegsArm64) error {
	iovec := Iovec{(*byte)(unsafe.Pointer(regs)), uint64(unsafe.Sizeof(*regs))}
	return ptracePtr(PTRACE_SETREGSET, pid, uintptr(addr), unsafe.Pointer(&iovec))