libgo: Update to October 24 version of master library.

From-SVN: r204466

libgo/go/net/file_unix.go

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build darwin freebsd linux netbsd openbsd
+// +build darwin dragonfly freebsd linux netbsd openbsd
 
 package net
 
@@ -12,14 +12,11 @@ import (
 )
 
 func newFileFD(f *os.File) (*netFD, error) {
-	syscall.ForkLock.RLock()
-	fd, err := syscall.Dup(int(f.Fd()))
+	fd, err := dupCloseOnExec(int(f.Fd()))
 	if err != nil {
-		syscall.ForkLock.RUnlock()
 		return nil, os.NewSyscallError("dup", err)
 	}
-	syscall.CloseOnExec(fd)
-	syscall.ForkLock.RUnlock()
+
 	if err = syscall.SetNonblock(fd, true); err != nil {
 		closesocket(fd)
 		return nil, err
@@ -70,6 +67,10 @@ func newFileFD(f *os.File) (*netFD, error) {
 		closesocket(fd)
 		return nil, err
 	}
+	if err := netfd.init(); err != nil {
+		netfd.Close()
+		return nil, err
+	}
 	netfd.setAddr(laddr, raddr)
 	return netfd, nil
 }