Golang syscall.NsecToTimeval函数代码示例

// Chtimes changes the access and modification times of the named
// file, similar to the Unix utime() or utimes() functions.
//
// The argument times are in nanoseconds, although the underlying
// filesystem may truncate or round the values to a more
// coarse time unit.
func Chtimes(name string, atime_ns int64, mtime_ns int64) Error {
	var utimes [2]syscall.Timeval
	utimes[0] = syscall.NsecToTimeval(atime_ns)
	utimes[1] = syscall.NsecToTimeval(mtime_ns)
	if e := syscall.Utimes(name, utimes[0:]); e != 0 {
		return &PathError{"chtimes", name, Errno(e)}
	}
	return nil
}

func setClock(t time.Time) error {
	tv := syscall.NsecToTimeval(t.UnixNano())
	if err := syscall.Settimeofday(&tv); err != nil {
		return errors.New("settimeofday: " + err.Error())
	}
	return nil
}

// WaitEvent can return dvb.ErrOverflow. If deadline is non zero time WaitEvent
// returns true if it doesn't receive any event up to deatline.
func (f API3) WaitEvent(ev *Event, deadline time.Time) (bool, error) {
	fd := f.Fd()
	if !deadline.IsZero() {
		timeout := deadline.Sub(time.Now())
		if timeout <= 0 {
			return true, nil
		}
		var r syscall.FdSet
		r.Bits[fd/64] = 1 << (fd % 64)
		tv := syscall.NsecToTimeval(int64(timeout))
		n, err := syscall.Select(int(fd+1), &r, nil, nil, &tv)
		if err != nil {
			return false, Error{"get", "event (select)", err}
		}
		if n == 0 {
			return true, nil
		}
	}
	_, _, e := syscall.Syscall(
		syscall.SYS_IOCTL,
		fd,
		_FE_GET_EVENT,
		uintptr(unsafe.Pointer(ev)),
	)
	if e != 0 {
		if e == syscall.EOVERFLOW {
			return false, dvb.ErrOverflow
		}
		return false, Error{"get", "event", e}
	}
	return false, nil
}

func (p *pollster) WaitFD(nsec int64) (fd int, mode int, err os.Error) {
	if p.nReady == 0 {
		var timeout *syscall.Timeval
		var tv syscall.Timeval
		timeout = nil
		if nsec > 0 {
			tv = syscall.NsecToTimeval(nsec)
			timeout = &tv
		}

		var n, e int
		var tmpReadFds, tmpWriteFds syscall.FdSet_t
		for {
			// Temporary syscall.FdSet_ts into which the values are copied
			// because select mutates the values.
			tmpReadFds = *p.readFds
			tmpWriteFds = *p.writeFds

			n, e = syscall.Select(p.maxFd+1, &tmpReadFds, &tmpWriteFds, nil, timeout)
			if e != syscall.EINTR {
				break
			}
		}
		if e != 0 {
			return -1, 0, os.NewSyscallError("select", e)
		}
		if n == 0 {
			return -1, 0, nil
		}

		p.nReady = n
		*p.readyReadFds = tmpReadFds
		*p.readyWriteFds = tmpWriteFds
		p.lastFd = 0
	}

	flag := false
	for i := p.lastFd; i < p.maxFd+1; i++ {
		if syscall.FDIsSet(i, p.readyReadFds) {
			flag = true
			mode = 'r'
			syscall.FDClr(i, p.readyReadFds)
		} else if syscall.FDIsSet(i, p.readyWriteFds) {
			flag = true
			mode = 'w'
			syscall.FDClr(i, p.readyWriteFds)
		}
		if flag {
			if !syscall.FDIsSet(i, p.repeatFds) {
				p.DelFD(i, mode)
			}
			p.nReady--
			p.lastFd = i
			return i, mode, nil
		}
	}

	// Will not reach here.  Just to shut up the compiler.
	return -1, 0, nil
}

func traceOne(addr *syscall.SockaddrInet4, ttl int) *ReturnArgs {
	cli, err := syscall.Socket(syscall.AF_INET, syscall.SOCK_DGRAM, syscall.IPPROTO_UDP)
	if err != nil {
		exitWithError(err)
	}
	srv, err := syscall.Socket(syscall.AF_INET, syscall.SOCK_RAW, syscall.IPPROTO_ICMP)
	if err != nil {
		exitWithError(err)
	}

	defer syscall.Close(cli)
	defer syscall.Close(srv)

	// set ttl, stolen from somewhere else...
	// https://github.com/aeden/traceroute/blob/master/traceroute.go#L195
	if err := syscall.SetsockoptInt(cli, syscall.SOL_IP, syscall.IP_TTL, ttl); err != nil {
		exitWithError(err)
	}

	// set timeout, stolen from somewhere else...
	// https://github.com/aeden/traceroute/blob/master/traceroute.go#L197
	tv := syscall.NsecToTimeval(1e6 * TIMEOUT)
	if err := syscall.SetsockoptTimeval(srv, syscall.SOL_SOCKET, syscall.SO_RCVTIMEO, &tv); err != nil {
		exitWithError(err)
	}
	if err := syscall.Bind(srv, toAddr(HOST, RECV_PORT)); err != nil {
		exitWithError(err)
	}

	rr := &ReturnArgs{}
	start := time.Now()
	if err := syscall.Sendto(cli, makeICMP(), 0, addr); err != nil {
		return rr
	}

	buf := make([]byte, 512)
	_, from, err := syscall.Recvfrom(srv, buf, 0)
	if err != nil {
		return rr
	}

	rr.elapsed = float64(time.Since(start).Nanoseconds()) / 1e6
	t, c := parseICMP(buf)
	if t == 3 && c == 3 { // Destination port unreachable, type==3 && code==3
		rr.done = true
	} else if t != 11 { // Time Exceeded, type==11 && code in (0,1)
		return rr
	}
	rr.ok = true
	rr.ip = toStr(from)
	addrs, err := net.LookupAddr(rr.ip)
	if err != nil {
		rr.addr = rr.ip
	} else {
		rr.addr = addrs[0]
	}
	return rr
}

// Select wraps syscall.Select with Go types
func Select(n int, r, w, e *FDSet, timeout time.Duration) error {
	var timeval *syscall.Timeval
	if timeout >= 0 {
		t := syscall.NsecToTimeval(timeout.Nanoseconds())
		timeval = &t
	}

	return sysSelect(n, r, w, e, timeval)
}

// Traceroute executes traceroute to given destination, using options from TracerouteOptions
// and sending updates to chan c
//
// Outbound packets are UDP packets and inbound packets are ICMP.
//
// Returns an error or nil if no error occurred
func Traceroute(dest *net.IPAddr, options *TracerouteOptions, c chan TraceUpdate) (err error) {
	var destAddr [4]byte
	copy(destAddr[:], dest.IP.To4())
	socketAddr, err := getSocketAddr()
	if err != nil {
		return
	}

	timeoutMs := (int64)(options.TimeoutMs)
	tv := syscall.NsecToTimeval(1000 * 1000 * timeoutMs)

	ttl := 1
	for {
		// Set up receiving socket
		recvSocket, err := syscall.Socket(syscall.AF_INET, syscall.SOCK_RAW, syscall.IPPROTO_ICMP)
		if err != nil {
			log.Fatal("Cannot setup receive socket, please run as root or with CAP_NET_RAW permissions")
			return err
		}
		// Set up sending socket
		sendSocket, err := syscall.Socket(syscall.AF_INET, syscall.SOCK_DGRAM, syscall.IPPROTO_UDP)
		if err != nil {
			log.Fatal("Cannot setup sending socket")
			return err
		}

		start := time.Now()
		syscall.SetsockoptInt(sendSocket, 0x0, syscall.IP_TTL, ttl)
		syscall.SetsockoptTimeval(recvSocket, syscall.SOL_SOCKET, syscall.SO_RCVTIMEO, &tv)
		syscall.Bind(recvSocket, &syscall.SockaddrInet4{Port: options.Port, Addr: socketAddr})
		syscall.Sendto(sendSocket, []byte{0x0}, 0, &syscall.SockaddrInet4{Port: options.Port, Addr: destAddr})

		var p = make([]byte, options.PacketSize)
		n, from, err := syscall.Recvfrom(recvSocket, p, 0)
		elapsed := time.Since(start)
		if err == nil {
			currAddr := from.(*syscall.SockaddrInet4).Addr
			hop := TraceUpdate{Success: true, Address: currAddr, N: n, ElapsedTime: elapsed, TTL: ttl}
			currHost, err := net.LookupAddr(hop.addressString())
			if err == nil {
				hop.Host = currHost[0]
			}
			// Send update
			c <- hop
			ttl += 1
			// We reached the destination
			if ttl > options.MaxTTL || currAddr == destAddr {
				ttl = 1
			}
		} else {
			c <- TraceUpdate{Success: false, TTL: ttl}
			ttl += 1
		}
		syscall.Close(recvSocket)
		syscall.Close(sendSocket)
	}
}

// setSocketTimeout sets the receive and send timeouts on the given socket.
func setSocketTimeout(fd int, timeout time.Duration) error {
	tv := syscall.NsecToTimeval(timeout.Nanoseconds())
	for _, opt := range []int{syscall.SO_RCVTIMEO, syscall.SO_SNDTIMEO} {
		if err := syscall.SetsockoptTimeval(fd, syscall.SOL_SOCKET, opt, &tv); err != nil {
			return os.NewSyscallError("setsockopt", err)
		}
	}
	return nil
}

func (f *AzukiFile) Utimens(a *time.Time, m *time.Time) fuse.Status {
	tv := make([]syscall.Timeval, 2)
	if a == nil {
		tv[0].Usec = _UTIME_OMIT
	} else {
		n := a.UnixNano()
		tv[0] = syscall.NsecToTimeval(n)
	}

	if m == nil {
		tv[1].Usec = _UTIME_OMIT
	} else {
		n := a.UnixNano()
		tv[1] = syscall.NsecToTimeval(n)
	}

	err := syscall.Futimes(int(f.File.Fd()), tv)
	return fuse.ToStatus(err)
}

func Hop(port, ttl int, IP_addr net.IP) (*Hop_ret, error) {

	ret_addr := net.IPv4(0, 0, 0, 0)
	success := false
	// make sockets
	send_udp_s, err := syscall.Socket(syscall.AF_INET, syscall.SOCK_DGRAM, syscall.IPPROTO_UDP)
	if err != nil {
		return nil, err
	}
	recv_icmp_s, err := syscall.Socket(syscall.AF_INET, syscall.SOCK_RAW, syscall.IPPROTO_ICMP)
	if err != nil {
		return nil, err
	}

	//editing TTL value for outgoing IPv4 packets
	if err := syscall.SetsockoptInt(send_udp_s, syscall.SOL_IP, syscall.IP_TTL, ttl); err != nil {
		return nil, err
	}
	tv := syscall.NsecToTimeval(1000 * 1000 * TIME_OUT_MS)
	syscall.SetsockoptTimeval(recv_icmp_s, syscall.SOL_SOCKET, syscall.SO_RCVTIMEO, &tv)

	defer syscall.Close(send_udp_s)
	defer syscall.Close(recv_icmp_s)

	//connect sockets
	if err := syscall.Bind(recv_icmp_s, &syscall.SockaddrInet4{Port: port, Addr: [4]byte{137, 224, 226, 47}}); err != nil {
		return nil, err
	}

	//send udp-packet
	var IP [4]byte
	copy(IP[:], IP_addr.To4())
	if err := syscall.Sendto(send_udp_s, []byte{0x42, 0x42}, 0, &syscall.SockaddrInet4{Port: 1337, Addr: IP}); err != nil {
		return nil, err
	}

	//receive ICMP
	recv_buffer := make([]byte, 4096)
	_, _, err = syscall.Recvfrom(recv_icmp_s, recv_buffer, 0)
	if err == nil {
		header, err := ipv4.ParseHeader(recv_buffer)
		if err != nil {
			log.Errorf("%q", err)
		}
		success = true
		ret_addr = header.Src
	} else {
		//time out
		success = false
		ret_addr = net.IPv4(0, 0, 0, 0)
		//log.Errorf("%q", err)
	}
	//resolve (timeout) errors, retry or return false...
	return &Hop_ret{Addr: ret_addr, TTL: ttl, success: success}, nil
}

// This implementation should work for all systems that implement the utimes syscall
func (e *entry) SetMtime(mtime time.Time) error {
	tvMtime := syscall.NsecToTimeval(mtime.UnixNano())
	tvAtime := syscall.NsecToTimeval(time.Now().UnixNano())

	resolvedPath := resolveSymlink(e.realPath())

	err := syscall.Utimes(resolvedPath, []syscall.Timeval{tvAtime, tvMtime})

	if err != nil {
		return err
	}

	e.fileInfo, err = os.Stat(resolvedPath)

	if err != nil {
		return err
	}

	return nil
}

// Take a shared lock on an object.
func (ioctx *IOContext) LockShared(oid, name, cookie, tag, desc string, duration time.Duration, flags *byte) (int, error) {
	c_oid := C.CString(oid)
	c_name := C.CString(name)
	c_cookie := C.CString(cookie)
	c_tag := C.CString(tag)
	c_desc := C.CString(desc)

	var c_duration C.struct_timeval
	if duration != 0 {
		tv := syscall.NsecToTimeval(time.Now().Add(duration).UnixNano())
		c_duration = C.struct_timeval{tv_sec: C.__time_t(tv.Sec), tv_usec: C.__suseconds_t(tv.Usec)}
	}

	var c_flags C.uint8_t
	if flags != nil {
		c_flags = C.uint8_t(*flags)
	}

	defer C.free(unsafe.Pointer(c_oid))
	defer C.free(unsafe.Pointer(c_name))
	defer C.free(unsafe.Pointer(c_cookie))
	defer C.free(unsafe.Pointer(c_tag))
	defer C.free(unsafe.Pointer(c_desc))

	ret := C.rados_lock_shared(
		ioctx.ioctx,
		c_oid,
		c_name,
		c_cookie,
		c_tag,
		c_desc,
		&c_duration,
		c_flags)

	// 0 on success, negative error code on failure
	// -EBUSY if the lock is already held by another (client, cookie) pair
	// -EEXIST if the lock is already held by the same (client, cookie) pair

	switch ret {
	case 0:
		return int(ret), nil
	case -16: // EBUSY
		return int(ret), nil
	case -17: // EEXIST
		return int(ret), nil
	default:
		return int(ret), RadosError(int(ret))
	}
}

// SetSocketTimeout sets the send and receive timeout for each socket in the
// netlink handle. Although the socket timeout has granularity of one
// microsecond, the effective granularity is floored by the kernel timer tick,
// which default value is four milliseconds.
func (h *Handle) SetSocketTimeout(to time.Duration) error {
	if to < time.Microsecond {
		return fmt.Errorf("invalid timeout, minimul value is %s", time.Microsecond)
	}
	tv := syscall.NsecToTimeval(to.Nanoseconds())
	for _, sh := range h.sockets {
		fd := sh.Socket.GetFd()
		err := syscall.SetsockoptTimeval(fd, syscall.SOL_SOCKET, syscall.SO_RCVTIMEO, &tv)
		if err != nil {
			return err
		}
		err = syscall.SetsockoptTimeval(fd, syscall.SOL_SOCKET, syscall.SO_SNDTIMEO, &tv)
		if err != nil {
			return err
		}
	}
	return nil
}

func main() {
	lsFiles := exec.Command("git", "ls-files", "-z")

	out, err := lsFiles.Output()
	if err != nil {
		fmt.Fprint(os.Stderr, err)
		os.Exit(1)
	}

	files := strings.Split(strings.TrimRight(string(out), "\x00"), "\x00")
	for _, file := range files {
		gitLog := exec.Command(
			"/bin/sh", "-c",
			fmt.Sprintf(`git log -n 1 --date=rfc2822 "%s" | head -n 3 | tail -n 1`, file),
		)

		out, err := gitLog.Output()

		if err != nil {
			fmt.Fprint(os.Stderr, err)
			os.Exit(1)
		}

		mStr := strings.TrimSpace(strings.TrimLeft(string(out), "Date:"))
		mTime, err := time.Parse(rfc2822, mStr)

		if err != nil {
			fmt.Fprintf(os.Stderr, "%s on %s", err, file)
			os.Exit(1)
		}

		mTimeval := syscall.NsecToTimeval(mTime.UnixNano())
		times := []syscall.Timeval{
			mTimeval,
			mTimeval,
		}
		syscall.Utimes(file, times)

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

func waitWithTimeout(socket int, timeout time.Duration) (state SocketState, err error) {
	wfdset := &syscall.FdSet{}

	FD_ZERO(wfdset)
	FD_SET(wfdset, socket)

	timeval := syscall.NsecToTimeval(int64(timeout))

	syscall.Select(socket+1, nil, wfdset, nil, &timeval)

	errcode, err := syscall.GetsockoptInt(socket, syscall.SOL_SOCKET, syscall.SO_ERROR)
	if err != nil {
		state = SocketError
		return
	}

	if errcode == int(syscall.EHOSTUNREACH) {
		state = SocketNotReached
		return
	}

	if errcode == int(syscall.ECONNREFUSED) {
		state = SocketPortClosed
		return
	}

	if errcode != 0 {
		state = SocketError
		err = fmt.Errorf("Connect Error: %v", errcode)
		return
	}

	if FD_ISSET(wfdset, socket) {
		state = SocketConnected
	} else {
		state = SocketTimedOut
	}
	return
}