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path: root/src/pkg/net/fd_windows.go
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Diffstat (limited to 'src/pkg/net/fd_windows.go')
-rw-r--r--src/pkg/net/fd_windows.go644
1 files changed, 0 insertions, 644 deletions
diff --git a/src/pkg/net/fd_windows.go b/src/pkg/net/fd_windows.go
deleted file mode 100644
index 6d69e0624..000000000
--- a/src/pkg/net/fd_windows.go
+++ /dev/null
@@ -1,644 +0,0 @@
-// Copyright 2010 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-package net
-
-import (
- "errors"
- "io"
- "os"
- "runtime"
- "sync"
- "syscall"
- "time"
- "unsafe"
-)
-
-var (
- initErr error
- ioSync uint64
-)
-
-// CancelIo Windows API cancels all outstanding IO for a particular
-// socket on current thread. To overcome that limitation, we run
-// special goroutine, locked to OS single thread, that both starts
-// and cancels IO. It means, there are 2 unavoidable thread switches
-// for every IO.
-// Some newer versions of Windows has new CancelIoEx API, that does
-// not have that limitation and can be used from any thread. This
-// package uses CancelIoEx API, if present, otherwise it fallback
-// to CancelIo.
-
-var (
- canCancelIO bool // determines if CancelIoEx API is present
- skipSyncNotif bool
- hasLoadSetFileCompletionNotificationModes bool
-)
-
-func sysInit() {
- var d syscall.WSAData
- e := syscall.WSAStartup(uint32(0x202), &d)
- if e != nil {
- initErr = os.NewSyscallError("WSAStartup", e)
- }
- canCancelIO = syscall.LoadCancelIoEx() == nil
- if syscall.LoadGetAddrInfo() == nil {
- lookupPort = newLookupPort
- lookupIP = newLookupIP
- }
-
- hasLoadSetFileCompletionNotificationModes = syscall.LoadSetFileCompletionNotificationModes() == nil
- if hasLoadSetFileCompletionNotificationModes {
- // It's not safe to use FILE_SKIP_COMPLETION_PORT_ON_SUCCESS if non IFS providers are installed:
- // http://support.microsoft.com/kb/2568167
- skipSyncNotif = true
- protos := [2]int32{syscall.IPPROTO_TCP, 0}
- var buf [32]syscall.WSAProtocolInfo
- len := uint32(unsafe.Sizeof(buf))
- n, err := syscall.WSAEnumProtocols(&protos[0], &buf[0], &len)
- if err != nil {
- skipSyncNotif = false
- } else {
- for i := int32(0); i < n; i++ {
- if buf[i].ServiceFlags1&syscall.XP1_IFS_HANDLES == 0 {
- skipSyncNotif = false
- break
- }
- }
- }
- }
-}
-
-func closesocket(s syscall.Handle) error {
- return syscall.Closesocket(s)
-}
-
-func canUseConnectEx(net string) bool {
- switch net {
- case "udp", "udp4", "udp6", "ip", "ip4", "ip6":
- // ConnectEx windows API does not support connectionless sockets.
- return false
- }
- return syscall.LoadConnectEx() == nil
-}
-
-func dial(net string, ra Addr, dialer func(time.Time) (Conn, error), deadline time.Time) (Conn, error) {
- if !canUseConnectEx(net) {
- // Use the relatively inefficient goroutine-racing
- // implementation of DialTimeout.
- return dialChannel(net, ra, dialer, deadline)
- }
- return dialer(deadline)
-}
-
-// operation contains superset of data necessary to perform all async IO.
-type operation struct {
- // Used by IOCP interface, it must be first field
- // of the struct, as our code rely on it.
- o syscall.Overlapped
-
- // fields used by runtime.netpoll
- runtimeCtx uintptr
- mode int32
- errno int32
- qty uint32
-
- // fields used only by net package
- fd *netFD
- errc chan error
- buf syscall.WSABuf
- sa syscall.Sockaddr
- rsa *syscall.RawSockaddrAny
- rsan int32
- handle syscall.Handle
- flags uint32
-}
-
-func (o *operation) InitBuf(buf []byte) {
- o.buf.Len = uint32(len(buf))
- o.buf.Buf = nil
- if len(buf) != 0 {
- o.buf.Buf = &buf[0]
- }
-}
-
-// ioSrv executes net IO requests.
-type ioSrv struct {
- req chan ioSrvReq
-}
-
-type ioSrvReq struct {
- o *operation
- submit func(o *operation) error // if nil, cancel the operation
-}
-
-// ProcessRemoteIO will execute submit IO requests on behalf
-// of other goroutines, all on a single os thread, so it can
-// cancel them later. Results of all operations will be sent
-// back to their requesters via channel supplied in request.
-// It is used only when the CancelIoEx API is unavailable.
-func (s *ioSrv) ProcessRemoteIO() {
- runtime.LockOSThread()
- defer runtime.UnlockOSThread()
- for r := range s.req {
- if r.submit != nil {
- r.o.errc <- r.submit(r.o)
- } else {
- r.o.errc <- syscall.CancelIo(r.o.fd.sysfd)
- }
- }
-}
-
-// ExecIO executes a single IO operation o. It submits and cancels
-// IO in the current thread for systems where Windows CancelIoEx API
-// is available. Alternatively, it passes the request onto
-// runtime netpoll and waits for completion or cancels request.
-func (s *ioSrv) ExecIO(o *operation, name string, submit func(o *operation) error) (int, error) {
- fd := o.fd
- // Notify runtime netpoll about starting IO.
- err := fd.pd.Prepare(int(o.mode))
- if err != nil {
- return 0, &OpError{name, fd.net, fd.laddr, err}
- }
- // Start IO.
- if canCancelIO {
- err = submit(o)
- } else {
- // Send request to a special dedicated thread,
- // so it can stop the IO with CancelIO later.
- s.req <- ioSrvReq{o, submit}
- err = <-o.errc
- }
- switch err {
- case nil:
- // IO completed immediately
- if o.fd.skipSyncNotif {
- // No completion message will follow, so return immediately.
- return int(o.qty), nil
- }
- // Need to get our completion message anyway.
- case syscall.ERROR_IO_PENDING:
- // IO started, and we have to wait for its completion.
- err = nil
- default:
- return 0, &OpError{name, fd.net, fd.laddr, err}
- }
- // Wait for our request to complete.
- err = fd.pd.Wait(int(o.mode))
- if err == nil {
- // All is good. Extract our IO results and return.
- if o.errno != 0 {
- err = syscall.Errno(o.errno)
- return 0, &OpError{name, fd.net, fd.laddr, err}
- }
- return int(o.qty), nil
- }
- // IO is interrupted by "close" or "timeout"
- netpollErr := err
- switch netpollErr {
- case errClosing, errTimeout:
- // will deal with those.
- default:
- panic("net: unexpected runtime.netpoll error: " + netpollErr.Error())
- }
- // Cancel our request.
- if canCancelIO {
- err := syscall.CancelIoEx(fd.sysfd, &o.o)
- // Assuming ERROR_NOT_FOUND is returned, if IO is completed.
- if err != nil && err != syscall.ERROR_NOT_FOUND {
- // TODO(brainman): maybe do something else, but panic.
- panic(err)
- }
- } else {
- s.req <- ioSrvReq{o, nil}
- <-o.errc
- }
- // Wait for cancellation to complete.
- fd.pd.WaitCanceled(int(o.mode))
- if o.errno != 0 {
- err = syscall.Errno(o.errno)
- if err == syscall.ERROR_OPERATION_ABORTED { // IO Canceled
- err = netpollErr
- }
- return 0, &OpError{name, fd.net, fd.laddr, err}
- }
- // We issued cancellation request. But, it seems, IO operation succeeded
- // before cancellation request run. We need to treat IO operation as
- // succeeded (the bytes are actually sent/recv from network).
- return int(o.qty), nil
-}
-
-// Start helper goroutines.
-var rsrv, wsrv *ioSrv
-var onceStartServer sync.Once
-
-func startServer() {
- rsrv = new(ioSrv)
- wsrv = new(ioSrv)
- if !canCancelIO {
- // Only CancelIo API is available. Lets start two special goroutines
- // locked to an OS thread, that both starts and cancels IO. One will
- // process read requests, while other will do writes.
- rsrv.req = make(chan ioSrvReq)
- go rsrv.ProcessRemoteIO()
- wsrv.req = make(chan ioSrvReq)
- go wsrv.ProcessRemoteIO()
- }
-}
-
-// Network file descriptor.
-type netFD struct {
- // locking/lifetime of sysfd + serialize access to Read and Write methods
- fdmu fdMutex
-
- // immutable until Close
- sysfd syscall.Handle
- family int
- sotype int
- isConnected bool
- skipSyncNotif bool
- net string
- laddr Addr
- raddr Addr
-
- rop operation // read operation
- wop operation // write operation
-
- // wait server
- pd pollDesc
-}
-
-func newFD(sysfd syscall.Handle, family, sotype int, net string) (*netFD, error) {
- if initErr != nil {
- return nil, initErr
- }
- onceStartServer.Do(startServer)
- return &netFD{sysfd: sysfd, family: family, sotype: sotype, net: net}, nil
-}
-
-func (fd *netFD) init() error {
- if err := fd.pd.Init(fd); err != nil {
- return err
- }
- if hasLoadSetFileCompletionNotificationModes {
- // We do not use events, so we can skip them always.
- flags := uint8(syscall.FILE_SKIP_SET_EVENT_ON_HANDLE)
- // It's not safe to skip completion notifications for UDP:
- // http://blogs.technet.com/b/winserverperformance/archive/2008/06/26/designing-applications-for-high-performance-part-iii.aspx
- if skipSyncNotif && fd.net == "tcp" {
- flags |= syscall.FILE_SKIP_COMPLETION_PORT_ON_SUCCESS
- }
- err := syscall.SetFileCompletionNotificationModes(fd.sysfd, flags)
- if err == nil && flags&syscall.FILE_SKIP_COMPLETION_PORT_ON_SUCCESS != 0 {
- fd.skipSyncNotif = true
- }
- }
- fd.rop.mode = 'r'
- fd.wop.mode = 'w'
- fd.rop.fd = fd
- fd.wop.fd = fd
- fd.rop.runtimeCtx = fd.pd.runtimeCtx
- fd.wop.runtimeCtx = fd.pd.runtimeCtx
- if !canCancelIO {
- fd.rop.errc = make(chan error)
- fd.wop.errc = make(chan error)
- }
- return nil
-}
-
-func (fd *netFD) setAddr(laddr, raddr Addr) {
- fd.laddr = laddr
- fd.raddr = raddr
- runtime.SetFinalizer(fd, (*netFD).Close)
-}
-
-func (fd *netFD) connect(la, ra syscall.Sockaddr, deadline time.Time) error {
- // Do not need to call fd.writeLock here,
- // because fd is not yet accessible to user,
- // so no concurrent operations are possible.
- if err := fd.init(); err != nil {
- return err
- }
- if !deadline.IsZero() {
- fd.setWriteDeadline(deadline)
- defer fd.setWriteDeadline(noDeadline)
- }
- if !canUseConnectEx(fd.net) {
- return syscall.Connect(fd.sysfd, ra)
- }
- // ConnectEx windows API requires an unconnected, previously bound socket.
- if la == nil {
- switch ra.(type) {
- case *syscall.SockaddrInet4:
- la = &syscall.SockaddrInet4{}
- case *syscall.SockaddrInet6:
- la = &syscall.SockaddrInet6{}
- default:
- panic("unexpected type in connect")
- }
- if err := syscall.Bind(fd.sysfd, la); err != nil {
- return err
- }
- }
- // Call ConnectEx API.
- o := &fd.wop
- o.sa = ra
- _, err := wsrv.ExecIO(o, "ConnectEx", func(o *operation) error {
- return syscall.ConnectEx(o.fd.sysfd, o.sa, nil, 0, nil, &o.o)
- })
- if err != nil {
- return err
- }
- // Refresh socket properties.
- return syscall.Setsockopt(fd.sysfd, syscall.SOL_SOCKET, syscall.SO_UPDATE_CONNECT_CONTEXT, (*byte)(unsafe.Pointer(&fd.sysfd)), int32(unsafe.Sizeof(fd.sysfd)))
-}
-
-func (fd *netFD) destroy() {
- if fd.sysfd == syscall.InvalidHandle {
- return
- }
- // Poller may want to unregister fd in readiness notification mechanism,
- // so this must be executed before closesocket.
- fd.pd.Close()
- closesocket(fd.sysfd)
- fd.sysfd = syscall.InvalidHandle
- // no need for a finalizer anymore
- runtime.SetFinalizer(fd, nil)
-}
-
-// Add a reference to this fd.
-// Returns an error if the fd cannot be used.
-func (fd *netFD) incref() error {
- if !fd.fdmu.Incref() {
- return errClosing
- }
- return nil
-}
-
-// Remove a reference to this FD and close if we've been asked to do so
-// (and there are no references left).
-func (fd *netFD) decref() {
- if fd.fdmu.Decref() {
- fd.destroy()
- }
-}
-
-// Add a reference to this fd and lock for reading.
-// Returns an error if the fd cannot be used.
-func (fd *netFD) readLock() error {
- if !fd.fdmu.RWLock(true) {
- return errClosing
- }
- return nil
-}
-
-// Unlock for reading and remove a reference to this FD.
-func (fd *netFD) readUnlock() {
- if fd.fdmu.RWUnlock(true) {
- fd.destroy()
- }
-}
-
-// Add a reference to this fd and lock for writing.
-// Returns an error if the fd cannot be used.
-func (fd *netFD) writeLock() error {
- if !fd.fdmu.RWLock(false) {
- return errClosing
- }
- return nil
-}
-
-// Unlock for writing and remove a reference to this FD.
-func (fd *netFD) writeUnlock() {
- if fd.fdmu.RWUnlock(false) {
- fd.destroy()
- }
-}
-
-func (fd *netFD) Close() error {
- if !fd.fdmu.IncrefAndClose() {
- return errClosing
- }
- // unblock pending reader and writer
- fd.pd.Evict()
- fd.decref()
- return nil
-}
-
-func (fd *netFD) shutdown(how int) error {
- if err := fd.incref(); err != nil {
- return err
- }
- defer fd.decref()
- err := syscall.Shutdown(fd.sysfd, how)
- if err != nil {
- return &OpError{"shutdown", fd.net, fd.laddr, err}
- }
- return nil
-}
-
-func (fd *netFD) closeRead() error {
- return fd.shutdown(syscall.SHUT_RD)
-}
-
-func (fd *netFD) closeWrite() error {
- return fd.shutdown(syscall.SHUT_WR)
-}
-
-func (fd *netFD) Read(buf []byte) (int, error) {
- if err := fd.readLock(); err != nil {
- return 0, err
- }
- defer fd.readUnlock()
- o := &fd.rop
- o.InitBuf(buf)
- n, err := rsrv.ExecIO(o, "WSARecv", func(o *operation) error {
- return syscall.WSARecv(o.fd.sysfd, &o.buf, 1, &o.qty, &o.flags, &o.o, nil)
- })
- if err == nil && n == 0 {
- err = io.EOF
- }
- if raceenabled {
- raceAcquire(unsafe.Pointer(&ioSync))
- }
- return n, err
-}
-
-func (fd *netFD) readFrom(buf []byte) (n int, sa syscall.Sockaddr, err error) {
- if len(buf) == 0 {
- return 0, nil, nil
- }
- if err := fd.readLock(); err != nil {
- return 0, nil, err
- }
- defer fd.readUnlock()
- o := &fd.rop
- o.InitBuf(buf)
- n, err = rsrv.ExecIO(o, "WSARecvFrom", func(o *operation) error {
- if o.rsa == nil {
- o.rsa = new(syscall.RawSockaddrAny)
- }
- o.rsan = int32(unsafe.Sizeof(*o.rsa))
- return syscall.WSARecvFrom(o.fd.sysfd, &o.buf, 1, &o.qty, &o.flags, o.rsa, &o.rsan, &o.o, nil)
- })
- if err != nil {
- return 0, nil, err
- }
- sa, _ = o.rsa.Sockaddr()
- return
-}
-
-func (fd *netFD) Write(buf []byte) (int, error) {
- if err := fd.writeLock(); err != nil {
- return 0, err
- }
- defer fd.writeUnlock()
- if raceenabled {
- raceReleaseMerge(unsafe.Pointer(&ioSync))
- }
- o := &fd.wop
- o.InitBuf(buf)
- return wsrv.ExecIO(o, "WSASend", func(o *operation) error {
- return syscall.WSASend(o.fd.sysfd, &o.buf, 1, &o.qty, 0, &o.o, nil)
- })
-}
-
-func (fd *netFD) writeTo(buf []byte, sa syscall.Sockaddr) (int, error) {
- if len(buf) == 0 {
- return 0, nil
- }
- if err := fd.writeLock(); err != nil {
- return 0, err
- }
- defer fd.writeUnlock()
- o := &fd.wop
- o.InitBuf(buf)
- o.sa = sa
- return wsrv.ExecIO(o, "WSASendto", func(o *operation) error {
- return syscall.WSASendto(o.fd.sysfd, &o.buf, 1, &o.qty, 0, o.sa, &o.o, nil)
- })
-}
-
-func (fd *netFD) acceptOne(rawsa []syscall.RawSockaddrAny, o *operation) (*netFD, error) {
- // Get new socket.
- s, err := sysSocket(fd.family, fd.sotype, 0)
- if err != nil {
- return nil, &OpError{"socket", fd.net, fd.laddr, err}
- }
-
- // Associate our new socket with IOCP.
- netfd, err := newFD(s, fd.family, fd.sotype, fd.net)
- if err != nil {
- closesocket(s)
- return nil, &OpError{"accept", fd.net, fd.laddr, err}
- }
- if err := netfd.init(); err != nil {
- fd.Close()
- return nil, err
- }
-
- // Submit accept request.
- o.handle = s
- o.rsan = int32(unsafe.Sizeof(rawsa[0]))
- _, err = rsrv.ExecIO(o, "AcceptEx", func(o *operation) error {
- return syscall.AcceptEx(o.fd.sysfd, o.handle, (*byte)(unsafe.Pointer(&rawsa[0])), 0, uint32(o.rsan), uint32(o.rsan), &o.qty, &o.o)
- })
- if err != nil {
- netfd.Close()
- return nil, err
- }
-
- // Inherit properties of the listening socket.
- err = syscall.Setsockopt(s, syscall.SOL_SOCKET, syscall.SO_UPDATE_ACCEPT_CONTEXT, (*byte)(unsafe.Pointer(&fd.sysfd)), int32(unsafe.Sizeof(fd.sysfd)))
- if err != nil {
- netfd.Close()
- return nil, &OpError{"Setsockopt", fd.net, fd.laddr, err}
- }
-
- return netfd, nil
-}
-
-func (fd *netFD) accept() (*netFD, error) {
- if err := fd.readLock(); err != nil {
- return nil, err
- }
- defer fd.readUnlock()
-
- o := &fd.rop
- var netfd *netFD
- var err error
- var rawsa [2]syscall.RawSockaddrAny
- for {
- netfd, err = fd.acceptOne(rawsa[:], o)
- if err == nil {
- break
- }
- // Sometimes we see WSAECONNRESET and ERROR_NETNAME_DELETED is
- // returned here. These happen if connection reset is received
- // before AcceptEx could complete. These errors relate to new
- // connection, not to AcceptEx, so ignore broken connection and
- // try AcceptEx again for more connections.
- operr, ok := err.(*OpError)
- if !ok {
- return nil, err
- }
- errno, ok := operr.Err.(syscall.Errno)
- if !ok {
- return nil, err
- }
- switch errno {
- case syscall.ERROR_NETNAME_DELETED, syscall.WSAECONNRESET:
- // ignore these and try again
- default:
- return nil, err
- }
- }
-
- // Get local and peer addr out of AcceptEx buffer.
- var lrsa, rrsa *syscall.RawSockaddrAny
- var llen, rlen int32
- syscall.GetAcceptExSockaddrs((*byte)(unsafe.Pointer(&rawsa[0])),
- 0, uint32(o.rsan), uint32(o.rsan), &lrsa, &llen, &rrsa, &rlen)
- lsa, _ := lrsa.Sockaddr()
- rsa, _ := rrsa.Sockaddr()
-
- netfd.setAddr(netfd.addrFunc()(lsa), netfd.addrFunc()(rsa))
- return netfd, nil
-}
-
-func skipRawSocketTests() (skip bool, skipmsg string, err error) {
- // From http://msdn.microsoft.com/en-us/library/windows/desktop/ms740548.aspx:
- // Note: To use a socket of type SOCK_RAW requires administrative privileges.
- // Users running Winsock applications that use raw sockets must be a member of
- // the Administrators group on the local computer, otherwise raw socket calls
- // will fail with an error code of WSAEACCES. On Windows Vista and later, access
- // for raw sockets is enforced at socket creation. In earlier versions of Windows,
- // access for raw sockets is enforced during other socket operations.
- s, err := syscall.Socket(syscall.AF_INET, syscall.SOCK_RAW, 0)
- if err == syscall.WSAEACCES {
- return true, "skipping test; no access to raw socket allowed", nil
- }
- if err != nil {
- return true, "", err
- }
- defer syscall.Closesocket(s)
- return false, "", nil
-}
-
-// Unimplemented functions.
-
-func (fd *netFD) dup() (*os.File, error) {
- // TODO: Implement this
- return nil, os.NewSyscallError("dup", syscall.EWINDOWS)
-}
-
-var errNoSupport = errors.New("address family not supported")
-
-func (fd *netFD) readMsg(p []byte, oob []byte) (n, oobn, flags int, sa syscall.Sockaddr, err error) {
- return 0, 0, 0, nil, errNoSupport
-}
-
-func (fd *netFD) writeMsg(p []byte, oob []byte, sa syscall.Sockaddr) (n int, oobn int, err error) {
- return 0, 0, errNoSupport
-}
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