// mmap memory maps a DB's data file.
// Based on: https://github.com/edsrzf/mmap-go
func mmap(db *DB, sz int) error {
if !db.readOnly {
// Truncate the database to the size of the mmap.
if err := db.file.Truncate(int64(sz)); err != nil {
return fmt.Errorf("truncate: %s", err)
}
}
// Open a file mapping handle.
sizelo := uint32(sz >> 32)
sizehi := uint32(sz) & 0xffffffff
h, errno := syscall.CreateFileMapping(syscall.Handle(db.file.Fd()), nil, syscall.PAGE_READONLY, sizelo, sizehi, nil)
if h == 0 {
return os.NewSyscallError("CreateFileMapping", errno)
}
// Create the memory map.
addr, errno := syscall.MapViewOfFile(h, syscall.FILE_MAP_READ, 0, 0, uintptr(sz))
if addr == 0 {
return os.NewSyscallError("MapViewOfFile", errno)
}
// Close mapping handle.
if err := syscall.CloseHandle(syscall.Handle(h)); err != nil {
return os.NewSyscallError("CloseHandle", err)
}
// Convert to a byte array.
db.data = ((*[maxMapSize]byte)(unsafe.Pointer(addr)))
db.datasz = sz
return nil
}
func setDefaultSockopts(s, f, t int) error {
switch f {
case syscall.AF_INET6:
// Allow both IP versions even if the OS default is otherwise.
// Note that some operating systems never admit this option.
syscall.SetsockoptInt(s, syscall.IPPROTO_IPV6, syscall.IPV6_V6ONLY, 0)
}
if f == syscall.AF_UNIX ||
(f == syscall.AF_INET || f == syscall.AF_INET6) && t == syscall.SOCK_STREAM {
// Allow reuse of recently-used addresses.
err := syscall.SetsockoptInt(s, syscall.SOL_SOCKET, syscall.SO_REUSEADDR, 1)
if err != nil {
return os.NewSyscallError("setsockopt", err)
}
}
// Allow broadcast.
err := syscall.SetsockoptInt(s, syscall.SOL_SOCKET, syscall.SO_BROADCAST, 1)
if err != nil {
return os.NewSyscallError("setsockopt", err)
}
return nil
}
// If the ifindex is zero, interfaceMulticastAddrTable returns
// addresses for all network interfaces. Otherwise it returns
// addresses for a specific interface.
func interfaceMulticastAddrTable(ifindex int) ([]Addr, os.Error) {
var (
tab []byte
e int
msgs []syscall.RoutingMessage
ifmat []Addr
)
tab, e = syscall.RouteRIB(syscall.NET_RT_IFLIST2, ifindex)
if e != 0 {
return nil, os.NewSyscallError("route rib", e)
}
msgs, e = syscall.ParseRoutingMessage(tab)
if e != 0 {
return nil, os.NewSyscallError("route message", e)
}
for _, m := range msgs {
switch v := m.(type) {
case *syscall.InterfaceMulticastAddrMessage:
if ifindex == 0 || ifindex == int(v.Header.Index) {
ifma, err := newMulticastAddr(v)
if err != nil {
return nil, err
}
ifmat = append(ifmat, ifma...)
}
}
}
return ifmat, nil
}
// If the ifindex is zero, interfaceTable returns mappings of all
// network interfaces. Otheriwse it returns a mapping of a specific
// interface.
func interfaceTable(ifindex int) ([]Interface, error) {
tab, err := syscall.NetlinkRIB(syscall.RTM_GETLINK, syscall.AF_UNSPEC)
if err != nil {
return nil, os.NewSyscallError("netlink rib", err)
}
msgs, err := syscall.ParseNetlinkMessage(tab)
if err != nil {
return nil, os.NewSyscallError("netlink message", err)
}
var ift []Interface
for _, m := range msgs {
switch m.Header.Type {
case syscall.NLMSG_DONE:
goto done
case syscall.RTM_NEWLINK:
ifim := (*syscall.IfInfomsg)(unsafe.Pointer(&m.Data[0]))
if ifindex == 0 || ifindex == int(ifim.Index) {
attrs, err := syscall.ParseNetlinkRouteAttr(&m)
if err != nil {
return nil, os.NewSyscallError("netlink routeattr", err)
}
ifi := newLink(ifim, attrs)
ift = append(ift, ifi)
}
}
}
done:
return ift, nil
}
func (c *CloneParams) CloneFrozen() (int, error) {
pid := callClone(c)
// TODO: clone errors?
c.CommWriter.Close()
c.stdhandles.Close()
c.comm = make(chan CommStatus)
go commReader(c.CommReader, c.comm)
var status syscall.WaitStatus
for {
wpid, err := syscall.Wait4(pid, &status, 0, nil) // TODO: rusage
if err != nil {
return -1, os.NewSyscallError("Wait4", err)
}
if wpid == pid {
break
}
}
if status.Stopped() && status.StopSignal() == syscall.SIGTRAP {
return pid, nil
}
if status.Exited() {
co, ok := <-c.comm
if ok {
return -1, childError(co)
}
return -1, fmt.Errorf("DAFUQ")
}
err := syscall.Kill(pid, syscall.SIGKILL)
if err != nil {
return -1, os.NewSyscallError("Kill", err)
}
return -1, fmt.Errorf("traps, signals, dafuq is this")
}
func newLookupPort(network, service string) (port int, err error) {
acquireThread()
defer releaseThread()
var stype int32
switch network {
case "tcp4", "tcp6":
stype = syscall.SOCK_STREAM
case "udp4", "udp6":
stype = syscall.SOCK_DGRAM
}
hints := syscall.AddrinfoW{
Family: syscall.AF_UNSPEC,
Socktype: stype,
Protocol: syscall.IPPROTO_IP,
}
var result *syscall.AddrinfoW
e := syscall.GetAddrInfoW(nil, syscall.StringToUTF16Ptr(service), &hints, &result)
if e != nil {
return 0, os.NewSyscallError("GetAddrInfoW", e)
}
defer syscall.FreeAddrInfoW(result)
if result == nil {
return 0, os.NewSyscallError("LookupPort", syscall.EINVAL)
}
addr := unsafe.Pointer(result.Addr)
switch result.Family {
case syscall.AF_INET:
a := (*syscall.RawSockaddrInet4)(addr)
return int(syscall.Ntohs(a.Port)), nil
case syscall.AF_INET6:
a := (*syscall.RawSockaddrInet6)(addr)
return int(syscall.Ntohs(a.Port)), nil
}
return 0, os.NewSyscallError("LookupPort", syscall.EINVAL)
}
// munmap Windows implementation
// Based on: https://github.com/edsrzf/mmap-go
// Based on: https://github.com/boltdb/bolt/bolt_windows.go
func munmap(b []byte) (err error) {
handleLock.Lock()
defer handleLock.Unlock()
addr := (uintptr)(unsafe.Pointer(&b[0]))
if err := syscall.UnmapViewOfFile(addr); err != nil {
return os.NewSyscallError("UnmapViewOfFile", err)
}
handle, ok := handleMap[addr]
if !ok {
// should be impossible; we would've seen the error above
return errors.New("unknown base address")
}
delete(handleMap, addr)
e := syscall.CloseHandle(syscall.Handle(handle))
if e != nil {
return os.NewSyscallError("CloseHandle", e)
}
file, ok := fileMap[addr]
if !ok {
// should be impossible; we would've seen the error above
return errors.New("unknown base address")
}
delete(fileMap, addr)
e = file.Close()
if e != nil {
return errors.New("close file" + e.Error())
}
return nil
}
// Must run within the I/O thread.
func (w *Watcher) startRead(watch *watch) error {
if e := syscall.CancelIo(watch.ino.handle); e != nil {
w.Error <- os.NewSyscallError("CancelIo", e)
w.deleteWatch(watch)
}
mask := toWindowsFlags(watch.mask)
for _, m := range watch.names {
mask |= toWindowsFlags(m)
}
if mask == 0 {
if e := syscall.CloseHandle(watch.ino.handle); e != nil {
w.Error <- os.NewSyscallError("CloseHandle", e)
}
delete(w.watches[watch.ino.volume], watch.ino.index)
return nil
}
e := syscall.ReadDirectoryChanges(watch.ino.handle, &watch.buf[0],
uint32(unsafe.Sizeof(watch.buf)), false, mask, nil, &watch.ov, 0)
if e != nil {
err := os.NewSyscallError("ReadDirectoryChanges", e)
if e == syscall.ERROR_ACCESS_DENIED && watch.mask&provisional == 0 {
// Watched directory was probably removed
if w.sendEvent(watch.path, watch.mask&FS_DELETE_SELF) {
if watch.mask&FS_ONESHOT != 0 {
watch.mask = 0
}
}
err = nil
}
w.deleteWatch(watch)
w.startRead(watch)
return err
}
return nil
}
func getIno(path string) (ino *inode, err error) {
pathp, e := syscall.UTF16PtrFromString(path)
if e != nil {
return nil, e
}
h, e := syscall.CreateFile(pathp,
syscall.FILE_LIST_DIRECTORY,
syscall.FILE_SHARE_READ|syscall.FILE_SHARE_WRITE|syscall.FILE_SHARE_DELETE,
nil, syscall.OPEN_EXISTING,
syscall.FILE_FLAG_BACKUP_SEMANTICS|syscall.FILE_FLAG_OVERLAPPED, 0)
if e != nil {
return nil, os.NewSyscallError("CreateFile", e)
}
var fi syscall.ByHandleFileInformation
if e = syscall.GetFileInformationByHandle(h, &fi); e != nil {
syscall.CloseHandle(h)
return nil, os.NewSyscallError("GetFileInformationByHandle", e)
}
ino = &inode{
handle: h,
volume: fi.VolumeSerialNumber,
index: uint64(fi.FileIndexHigh)<<32 | uint64(fi.FileIndexLow),
}
return ino, nil
}
func setDefaultSockopts(s, f, t int) error {
switch f {
case syscall.AF_INET6:
// Allow both IP versions even if the OS default is otherwise.
// Note that some operating systems never admit this option.
syscall.SetsockoptInt(s, syscall.IPPROTO_IPV6, syscall.IPV6_V6ONLY, 0)
}
if f == syscall.AF_UNIX ||
(f == syscall.AF_INET || f == syscall.AF_INET6) && t == syscall.SOCK_STREAM {
// Allow reuse of recently-used addresses.
err := syscall.SetsockoptInt(s, syscall.SOL_SOCKET, syscall.SO_REUSEADDR, 1)
if err != nil {
return os.NewSyscallError("setsockopt", err)
}
// Allow reuse of recently-used ports.
// This option is supported only in descendants of 4.4BSD,
// to make an effective multicast application and an application
// that requires quick draw possible.
err = syscall.SetsockoptInt(s, syscall.SOL_SOCKET, syscall.SO_REUSEPORT, 1)
if err != nil {
return os.NewSyscallError("setsockopt", err)
}
}
// Allow broadcast.
err := syscall.SetsockoptInt(s, syscall.SOL_SOCKET, syscall.SO_BROADCAST, 1)
if err != nil {
return os.NewSyscallError("setsockopt", err)
}
return nil
}
// Wrapper around the accept system call that marks the returned file
// descriptor as nonblocking and close-on-exec.
func accept(s int) (int, syscall.Sockaddr, error) {
ns, sa, err := accept4Func(s, syscall.SOCK_NONBLOCK|syscall.SOCK_CLOEXEC)
// On Linux the accept4 system call was introduced in 2.6.28
// kernel and on FreeBSD it was introduced in 10 kernel. If we
// get an ENOSYS error on both Linux and FreeBSD, or EINVAL
// error on Linux, fall back to using accept.
switch err {
case nil:
return ns, sa, nil
default: // errors other than the ones listed
return -1, sa, os.NewSyscallError("accept4", err)
case syscall.ENOSYS: // syscall missing
case syscall.EINVAL: // some Linux use this instead of ENOSYS
case syscall.EACCES: // some Linux use this instead of ENOSYS
case syscall.EFAULT: // some Linux use this instead of ENOSYS
}
// See ../syscall/exec_unix.go for description of ForkLock.
// It is probably okay to hold the lock across syscall.Accept
// because we have put fd.sysfd into non-blocking mode.
// However, a call to the File method will put it back into
// blocking mode. We can't take that risk, so no use of ForkLock here.
ns, sa, err = acceptFunc(s)
if err == nil {
syscall.CloseOnExec(ns)
}
if err != nil {
return -1, nil, os.NewSyscallError("accept", err)
}
if err = syscall.SetNonblock(ns, true); err != nil {
closeFunc(ns)
return -1, nil, os.NewSyscallError("setnonblock", err)
}
return ns, sa, nil
}
// Wrapper around the socket system call that marks the returned file
// descriptor as nonblocking and close-on-exec.
func sysSocket(family, sotype, proto int) (int, error) { // 创建socket套接字
s, err := socketFunc(family, sotype|syscall.SOCK_NONBLOCK|syscall.SOCK_CLOEXEC, proto)
// On Linux the SOCK_NONBLOCK and SOCK_CLOEXEC flags were
// introduced in 2.6.27 kernel and on FreeBSD both flags were
// introduced in 10 kernel. If we get an EINVAL error on Linux
// or EPROTONOSUPPORT error on FreeBSD, fall back to using
// socket without them.
switch err {
case nil:
return s, nil
default:
return -1, os.NewSyscallError("socket", err)
case syscall.EPROTONOSUPPORT, syscall.EINVAL:
}
// See ../syscall/exec_unix.go for description of ForkLock.
syscall.ForkLock.RLock()
s, err = socketFunc(family, sotype, proto)
if err == nil {
syscall.CloseOnExec(s)
}
syscall.ForkLock.RUnlock()
if err != nil {
return -1, os.NewSyscallError("socket", err)
}
if err = syscall.SetNonblock(s, true); err != nil {
closeFunc(s)
return -1, os.NewSyscallError("setnonblock", err)
}
return s, nil
}
// If the ifindex is zero, interfaceAddrTable returns addresses
// for all network interfaces. Otherwise it returns addresses
// for a specific interface.
func interfaceAddrTable(ifindex int) ([]Addr, os.Error) {
var (
tab []byte
e int
err os.Error
ifat []Addr
msgs []syscall.NetlinkMessage
)
tab, e = syscall.NetlinkRIB(syscall.RTM_GETADDR, syscall.AF_UNSPEC)
if e != 0 {
return nil, os.NewSyscallError("netlink rib", e)
}
msgs, e = syscall.ParseNetlinkMessage(tab)
if e != 0 {
return nil, os.NewSyscallError("netlink message", e)
}
ifat, err = addrTable(msgs, ifindex)
if err != nil {
return nil, err
}
return ifat, nil
}
func mmap(fd uintptr, off int64, l, inprot int) (sli []byte, err error) {
flProtect := uint32(syscall.PAGE_READONLY)
dwDesiredAccess := uint32(syscall.FILE_MAP_READ)
switch {
case inprot&WRITE != 0:
flProtect = syscall.PAGE_READWRITE
dwDesiredAccess = syscall.FILE_MAP_WRITE
case inprot&RDWR != 0:
flProtect = syscall.PAGE_READWRITE
dwDesiredAccess = syscall.FILE_MAP_WRITE
}
h, errno := syscall.CreateFileMapping(syscall.Handle(fd), nil, flProtect, 0, uint32(l), nil)
if h == 0 {
return nil, os.NewSyscallError("CreateFileMapping", errno)
}
addr, errno := syscall.MapViewOfFile(h, dwDesiredAccess, uint32(off>>32), uint32(off&0xFFFFFFFF), uintptr(l))
if addr == 0 {
return nil, os.NewSyscallError("MapViewOfFile", errno)
}
handleLock.Lock()
handleMap[addr] = h
handleLock.Unlock()
var header = struct {
d uintptr
l, c int
}{addr, l, l}
sli = *(*[]byte)(unsafe.Pointer(&header))
return sli, nil
}
// If the ifindex is zero, interfaceAddrTable returns addresses
// for all network interfaces. Otherwise it returns addresses
// for a specific interface.
func interfaceAddrTable(ifindex int) ([]Addr, error) {
tab, err := syscall.RouteRIB(syscall.NET_RT_IFLIST, ifindex)
if err != nil {
return nil, os.NewSyscallError("route rib", err)
}
msgs, err := syscall.ParseRoutingMessage(tab)
if err != nil {
return nil, os.NewSyscallError("route message", err)
}
var ifat []Addr
for _, m := range msgs {
switch v := m.(type) {
case *syscall.InterfaceAddrMessage:
if ifindex == 0 || ifindex == int(v.Header.Index) {
ifa, err := newAddr(v)
if err != nil {
return nil, err
}
if ifa != nil {
ifat = append(ifat, ifa)
}
}
}
}
return ifat, nil
}
func mmap(hfile uintptr, off int64, len int) (uintptr, error) {
flProtect := uint32(syscall.PAGE_READONLY)
dwDesiredAccess := uint32(syscall.FILE_MAP_READ)
flProtect = syscall.PAGE_READWRITE
dwDesiredAccess = syscall.FILE_MAP_WRITE
// The maximum size is the area of the file, starting from 0,
// that we wish to allow to be mappable. It is the sum of
// the length the user requested, plus the offset where that length
// is starting from. This does not map the data into memory.
maxSizeHigh := uint32((off + int64(len)) >> 32)
maxSizeLow := uint32((off + int64(len)) & 0xFFFFFFFF)
// TODO: Do we need to set some security attributes? It might help portability.
h, errno := syscall.CreateFileMapping(syscall.Handle(hfile), nil, flProtect, maxSizeHigh, maxSizeLow, nil)
if h == 0 {
return 0, os.NewSyscallError("CreateFileMapping", errno)
}
// Actually map a view of the data into memory. The view's size
// is the length the user requested.
fileOffsetHigh := uint32(off >> 32)
fileOffsetLow := uint32(off & 0xFFFFFFFF)
addr, errno := syscall.MapViewOfFile(h, dwDesiredAccess, fileOffsetHigh, fileOffsetLow, uintptr(len))
if addr == 0 {
return 0, os.NewSyscallError("MapViewOfFile", errno)
}
return addr, nil
}
// readEvents reads from the inotify file descriptor, converts the
// received events into Event objects and sends them via the Event channel
func (w *Watcher) readEvents() {
var (
buf [syscall.SizeofInotifyEvent * 4096]byte // Buffer for a maximum of 4096 raw events
n int // Number of bytes read with read()
errno int // Syscall errno
)
for {
n, errno = syscall.Read(w.fd, buf[0:])
// See if there is a message on the "done" channel
_, done := <-w.done
// If EOF or a "done" message is received
if n == 0 || done {
errno := syscall.Close(w.fd)
if errno == -1 {
w.Error <- os.NewSyscallError("close", errno)
}
close(w.Event)
close(w.Error)
return
}
if n < 0 {
w.Error <- os.NewSyscallError("read", errno)
continue
}
if n < syscall.SizeofInotifyEvent {
w.Error <- os.NewError("inotify: short read in readEvents()")
continue
}
var offset uint32 = 0
// We don't know how many events we just read into the buffer
// While the offset points to at least one whole event...
for offset <= uint32(n-syscall.SizeofInotifyEvent) {
// Point "raw" to the event in the buffer
raw := (*syscall.InotifyEvent)(unsafe.Pointer(&buf[offset]))
event := new(Event)
event.Mask = uint32(raw.Mask)
event.Cookie = uint32(raw.Cookie)
nameLen := uint32(raw.Len)
// If the event happened to the watched directory or the watched file, the kernel
// doesn't append the filename to the event, but we would like to always fill the
// the "Name" field with a valid filename. We retrieve the path of the watch from
// the "paths" map.
event.Name = w.paths[int(raw.Wd)]
if nameLen > 0 {
// Point "bytes" at the first byte of the filename
bytes := (*[syscall.PathMax]byte)(unsafe.Pointer(&buf[offset+syscall.SizeofInotifyEvent]))
// The filename is padded with NUL bytes. TrimRight() gets rid of those.
event.Name += "/" + strings.TrimRight(string(bytes[0:nameLen]), "\000")
}
// Send the event on the events channel
w.Event <- event
// Move to the next event in the buffer
offset += syscall.SizeofInotifyEvent + nameLen
}
}
}
// If the ifindex is zero, interfaceTable returns mappings of all
// network interfaces. Otherwise it returns a mapping of a specific
// interface.
func interfaceTable(ifindex int) ([]Interface, error) { // 如果ifindex为0，返回所有网络接口
tab, err := syscall.NetlinkRIB(syscall.RTM_GETLINK, syscall.AF_UNSPEC) // 获得netlink rib
if err != nil {
return nil, os.NewSyscallError("netlinkrib", err)
}
msgs, err := syscall.ParseNetlinkMessage(tab) // 解析netlink信息
if err != nil {
return nil, os.NewSyscallError("parsenetlinkmessage", err)
}
var ift []Interface
loop:
for _, m := range msgs { // 遍历获取的netlink信息
switch m.Header.Type {
case syscall.NLMSG_DONE:
break loop
case syscall.RTM_NEWLINK:
ifim := (*syscall.IfInfomsg)(unsafe.Pointer(&m.Data[0]))
if ifindex == 0 || ifindex == int(ifim.Index) {
attrs, err := syscall.ParseNetlinkRouteAttr(&m)
if err != nil {
return nil, os.NewSyscallError("parsenetlinkrouteattr", err)
}
ift = append(ift, *newLink(ifim, attrs)) // 加入到Interface Slice中
if ifindex == int(ifim.Index) {
break loop
}
}
}
}
return ift, nil
}
func mmap(f *os.File, offset int64, length int) (out []byte, err error) {
// Open a file mapping handle.
sizelo := uint32(length >> 32)
sizehi := uint32(length) & 0xffffffff
sharedHandle, errno := openSharedFile(f)
if errno != nil {
return nil, os.NewSyscallError("CreateFile", errno)
}
h, errno := syscall.CreateFileMapping(syscall.Handle(sharedHandle.Fd()), nil, syscall.PAGE_READONLY, sizelo, sizehi, nil)
if h == 0 {
return nil, os.NewSyscallError("CreateFileMapping", errno)
}
// Create the memory map.
addr, errno := syscall.MapViewOfFile(h, syscall.FILE_MAP_READ, 0, 0, uintptr(length))
if addr == 0 {
return nil, os.NewSyscallError("MapViewOfFile", errno)
}
handleLock.Lock()
handleMap[addr] = h
fileMap[addr] = sharedHandle
handleLock.Unlock()
// Convert to a byte array.
hdr := (*reflect.SliceHeader)(unsafe.Pointer(&out))
hdr.Data = uintptr(unsafe.Pointer(addr))
hdr.Len = length
hdr.Cap = length
return
}
func newSplicePair() (p *Pair, err error) {
p = &Pair{}
p.r, p.w, err = os.Pipe()
if err != nil {
return nil, err
}
errNo := syscall.Errno(0)
for _, f := range []*os.File{p.r, p.w} {
_, errNo = fcntl(f.Fd(), syscall.F_SETFL, syscall.O_NONBLOCK)
if errNo != 0 {
p.Close()
return nil, os.NewSyscallError("fcntl setfl", errNo)
}
}
p.size, errNo = fcntl(p.r.Fd(), F_GETPIPE_SZ, 0)
if errNo == syscall.EINVAL {
p.size = DefaultPipeSize
return p, nil
}
if errNo != 0 {
p.Close()
return nil, os.NewSyscallError("fcntl getsize", errNo)
}
return p, nil
}
func newLookupIP(name string) (addrs []IP, err error) {
acquireThread()
defer releaseThread()
hints := syscall.AddrinfoW{
Family: syscall.AF_UNSPEC,
Socktype: syscall.SOCK_STREAM,
Protocol: syscall.IPPROTO_IP,
}
var result *syscall.AddrinfoW
e := syscall.GetAddrInfoW(syscall.StringToUTF16Ptr(name), nil, &hints, &result)
if e != nil {
return nil, os.NewSyscallError("GetAddrInfoW", e)
}
defer syscall.FreeAddrInfoW(result)
addrs = make([]IP, 0, 5)
for ; result != nil; result = result.Next {
addr := unsafe.Pointer(result.Addr)
switch result.Family {
case syscall.AF_INET:
a := (*syscall.RawSockaddrInet4)(addr).Addr
addrs = append(addrs, IPv4(a[0], a[1], a[2], a[3]))
case syscall.AF_INET6:
a := (*syscall.RawSockaddrInet6)(addr).Addr
addrs = append(addrs, IP{a[0], a[1], a[2], a[3], a[4], a[5], a[6], a[7], a[8], a[9], a[10], a[11], a[12], a[13], a[14], a[15]})
default:
return nil, os.NewSyscallError("LookupIP", syscall.EWINDOWS)
}
}
return addrs, nil
}
// If the ifindex is zero, interfaceTable returns mappings of all
// network interfaces. Otheriwse it returns a mapping of a specific
// interface.
func interfaceTable(ifindex int) ([]Interface, error) {
var ift []Interface
tab, err := syscall.RouteRIB(syscall.NET_RT_IFLIST, ifindex)
if err != nil {
return nil, os.NewSyscallError("route rib", err)
}
msgs, err := syscall.ParseRoutingMessage(tab)
if err != nil {
return nil, os.NewSyscallError("route message", err)
}
for _, m := range msgs {
switch v := m.(type) {
case *syscall.InterfaceMessage:
if ifindex == 0 || ifindex == int(v.Header.Index) {
ifi, err := newLink(v)
if err != nil {
return nil, err
}
ift = append(ift, ifi...)
}
}
}
return ift, nil
}
// getNeighbors sends a request to netlink to retrieve all neighbors using
// the specified address family.
func getNeighbors(family Family) ([]*Neighbor, error) {
// Request neighbors belonging to a specific family from netlink
tab, err := syscall.NetlinkRIB(syscall.RTM_GETNEIGH, int(family))
if err != nil {
return nil, os.NewSyscallError("netlink rib", err)
}
// Parse netlink information into individual messages
msgs, err := syscall.ParseNetlinkMessage(tab)
if err != nil {
return nil, os.NewSyscallError("netlink message", err)
}
// Check messages for information
var nn []*Neighbor
for _, m := range msgs {
// Ignore any messages which don't indicate a new neighbor
if m.Header.Type != syscall.RTM_NEWNEIGH {
continue
}
// Attempt to parse an individual neighbor from a message
n, err := newNeighbor(&m)
if err != nil {
return nil, err
}
nn = append(nn, n)
}
return nn, nil
}
func (p *pollster) AddFD(fd int, mode int, repeat bool) os.Error {
var kmode int
if mode == 'r' {
kmode = syscall.EVFILT_READ
} else {
kmode = syscall.EVFILT_WRITE
}
var events [1]syscall.Kevent_t
ev := &events[0]
// EV_ADD - add event to kqueue list
// EV_ONESHOT - delete the event the first time it triggers
flags := syscall.EV_ADD
if !repeat {
flags |= syscall.EV_ONESHOT
}
syscall.SetKevent(ev, fd, kmode, flags)
n, e := syscall.Kevent(p.kq, &events, nil, nil)
if e != 0 {
return os.NewSyscallError("kevent", e)
}
if n != 1 || (ev.Flags&syscall.EV_ERROR) == 0 || int(ev.Ident) != fd || int(ev.Filter) != kmode {
return os.NewSyscallError("kqueue phase error", e)
}
if ev.Data != 0 {
return os.Errno(int(ev.Data))
}
return nil
}
// First return value is whether the pollServer should be woken up.
// This version always returns false.
func (p *pollster) AddFD(fd int, mode int, repeat bool) (bool, error) {
// pollServer is locked.
var kmode int
if mode == 'r' {
kmode = syscall.EVFILT_READ
} else {
kmode = syscall.EVFILT_WRITE
}
ev := &p.kbuf[0]
// EV_ADD - add event to kqueue list
// EV_ONESHOT - delete the event the first time it triggers
flags := syscall.EV_ADD
if !repeat {
flags |= syscall.EV_ONESHOT
}
syscall.SetKevent(ev, fd, kmode, flags)
n, err := syscall.Kevent(p.kq, p.kbuf[:], nil, nil)
if err != nil {
return false, os.NewSyscallError("kevent", err)
}
if n != 1 || (ev.Flags&syscall.EV_ERROR) == 0 || int(ev.Ident) != fd || int(ev.Filter) != kmode {
return false, os.NewSyscallError("kqueue phase error", err)
}
if ev.Data != 0 {
return false, syscall.Errno(int(ev.Data))
}
return false, nil
}
// adapterAddresses returns a list of IP adapter and address
// structures. The structure contains an IP adapter and flattened
// multiple IP addresses including unicast, anycast and multicast
// addresses.
func adapterAddresses() ([]*windows.IpAdapterAddresses, error) {
var b []byte
l := uint32(15000) // recommended initial size
for {
b = make([]byte, l)
err := windows.GetAdaptersAddresses(syscall.AF_UNSPEC, windows.GAA_FLAG_INCLUDE_PREFIX, 0, (*windows.IpAdapterAddresses)(unsafe.Pointer(&b[0])), &l)
if err == nil {
if l == 0 {
return nil, nil
}
break
}
if err.(syscall.Errno) != syscall.ERROR_BUFFER_OVERFLOW {
return nil, os.NewSyscallError("getadaptersaddresses", err)
}
if l <= uint32(len(b)) {
return nil, os.NewSyscallError("getadaptersaddresses", err)
}
}
var aas []*windows.IpAdapterAddresses
for aa := (*windows.IpAdapterAddresses)(unsafe.Pointer(&b[0])); aa != nil; aa = aa.Next {
aas = append(aas, aa)
}
return aas, nil
}
func initSecurityAttributes() (*syscall.SecurityAttributes, error) {
// create security descriptor
sd := make([]byte, 4096)
if res, _, err := procInitializeSecurityDescriptor.Call(
uintptr(unsafe.Pointer(&sd[0])),
SECURITY_DESCRIPTOR_REVISION); int(res) == 0 {
return nil, os.NewSyscallError("InitializeSecurityDescriptor", err)
}
// configure security descriptor
present := 1
defaulted := 0
if res, _, err := procSetSecurityDescriptorDacl.Call(
uintptr(unsafe.Pointer(&sd[0])),
uintptr(present),
uintptr(unsafe.Pointer(nil)), // acl
uintptr(defaulted)); int(res) == 0 {
return nil, os.NewSyscallError("SetSecurityDescriptorDacl", err)
}
var sa syscall.SecurityAttributes
sa.Length = uint32(unsafe.Sizeof(sa))
sa.SecurityDescriptor = uintptr(unsafe.Pointer(&sd[0]))
return &sa, nil
}
func (process *jobProcess) Wait() (int, error) {
s, e := syscall.WaitForSingleObject(syscall.Handle(process.processHandle), syscall.INFINITE)
switch s {
case syscall.WAIT_OBJECT_0:
break
case syscall.WAIT_FAILED:
return -1, os.NewSyscallError("WaitForSingleObject", e)
default:
return -1, errors.New("os: unexpected result from WaitForSingleObject")
}
var ec uint32
e = syscall.GetExitCodeProcess(syscall.Handle(process.processHandle), &ec)
if e != nil {
return -1, os.NewSyscallError("GetExitCodeProcess", e)
}
var u syscall.Rusage
e = syscall.GetProcessTimes(syscall.Handle(process.processHandle), &u.CreationTime, &u.ExitTime, &u.KernelTime, &u.UserTime)
if e != nil {
return -1, os.NewSyscallError("GetProcessTimes", e)
}
// NOTE(brainman): It seems that sometimes process is not dead
// when WaitForSingleObject returns. But we do not know any
// other way to wait for it. Sleeping for a while seems to do
// the trick sometimes. So we will sleep and smell the roses.
defer time.Sleep(5 * time.Millisecond)
defer syscall.CloseHandle(syscall.Handle(process.processHandle))
return int(ec), nil
}
// interfaceMulticastAddrTable returns addresses for a specific
// interface.
func interfaceMulticastAddrTable(ifi *Interface) ([]Addr, error) {
tab, err := syscall.RouteRIB(syscall.NET_RT_IFLIST2, ifi.Index)
if err != nil {
return nil, os.NewSyscallError("route rib", err)
}
msgs, err := syscall.ParseRoutingMessage(tab)
if err != nil {
return nil, os.NewSyscallError("route message", err)
}
var ifmat []Addr
for _, m := range msgs {
switch m := m.(type) {
case *syscall.InterfaceMulticastAddrMessage:
if ifi.Index == int(m.Header.Index) {
ifma, err := newMulticastAddr(ifi, m)
if err != nil {
return nil, err
}
if ifma != nil {
ifmat = append(ifmat, ifma)
}
}
}
}
return ifmat, nil
}
// enable raw mode and gather metrics, like number of columns
func (l *LineReader) raw() {
// STD_OUTPUT_HANDLE
h, errno := syscall.GetStdHandle(-11)
t.h = uintptr(h)
if int32(t.h) == -1 {
err := os.Errno(errno)
panic(err)
}
ok, _, e := syscall.Syscall(procGetConsoleMode, 2,
t.h, uintptr(unsafe.Pointer(&t.origTerm)), 0)
if ok == 0 {
err := os.NewSyscallError("GetConsoleMode", int(e))
panic(err)
}
raw := t.origTerm
raw &^= _ENABLE_LINE_INPUT | _ENABLE_ECHO_INPUT | _ENABLE_PROCESSED_INPUT | _ENABLE_WINDOW_INPUT
ok, _, e = syscall.Syscall(procSetConsoleMode, 2, t.h, uintptr(raw), 0)
if ok == 0 {
err := os.NewSyscallError("SetConsoleMode", int(e))
panic(err)
}
win := t.getConsoleInfo()
t.cols = int(win.dwSize.x)
t.rows = int(win.dwSize.y)
t.buf = new(buffer)
}