code review 5136052: net: add shutdown: TCPConn.CloseWrite and CloseRead

src/pkg/net/fd_windows.go

 // 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 (
         "os"
         "runtime"
         "sync"
@@ skipping 294 matching lines @@
                 return os.EINVAL
         }
 
         fd.incref()
         syscall.Shutdown(fd.sysfd, syscall.SHUT_RDWR)
         fd.closing = true
         fd.decref()
         return nil
 }
 
+func (fd *netFD) CloseRead() os.Error {
+        if fd == nil || fd.sysfd == syscall.InvalidHandle {
+                return os.EINVAL
+        }
+        syscall.Shutdown(fd.sysfd, syscall.SHUT_RD)
+        return nil
+}
+
+func (fd *netFD) CloseWrite() os.Error {
+        if fd == nil || fd.sysfd == syscall.InvalidHandle {
+                return os.EINVAL
+        }
+        syscall.Shutdown(fd.sysfd, syscall.SHUT_WR)
+        return nil
+}
+
 // Read from network.
 
 type readOp struct {
         bufOp
 }
 
 func (o *readOp) Submit() (errno int) {
         var d, f uint32
         return syscall.WSARecv(syscall.Handle(o.fd.sysfd), &o.buf, 1, &d, &f, &o.o, nil)
 }
@@ skipping 212 matching lines @@
         return nil, os.NewSyscallError("dup", syscall.EWINDOWS)
 }
 
 func (fd *netFD) ReadMsg(p []byte, oob []byte) (n, oobn, flags int, sa syscall.Sockaddr, err os.Error) {
         return 0, 0, 0, nil, os.EAFNOSUPPORT
 }
 
 func (fd *netFD) WriteMsg(p []byte, oob []byte, sa syscall.Sockaddr) (n int, oobn int, err os.Error) {
         return 0, 0, os.EAFNOSUPPORT
 }