libgo: update to Go 1.8 release candidate 1

    
    Compiler changes:
      * Change map assignment to use mapassign and assign value directly.
      * Change string iteration to use decoderune, faster for ASCII strings.
      * Change makeslice to take int, and use makeslice64 for larger values.
      * Add new noverflow field to hmap struct used for maps.
    
    Unresolved problems, to be fixed later:
      * Commented out test in go/types/sizes_test.go that doesn't compile.
      * Commented out reflect.TestStructOf test for padding after zero-sized field.
    
    Reviewed-on: https://go-review.googlesource.com/35231

gotools/:
	Updates for Go 1.8rc1.
	* Makefile.am (go_cmd_go_files): Add bug.go.
	(s-zdefaultcc): Write defaultPkgConfig.
	* Makefile.in: Rebuild.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@244456 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 22 insertions, 3 deletions

diff --git a/libgo/go/net/unixsock_posix.go b/libgo/go/net/unixsock_posix.go
index 5f0999c4c27..a8f892e6c46 100644
--- a/libgo/go/net/unixsock_posix.go
+++ b/libgo/go/net/unixsock_posix.go
@@ -94,6 +94,10 @@ func (a *UnixAddr) sockaddr(family int) (syscall.Sockaddr, error) {
 	return &syscall.SockaddrUnix{Name: a.Name}, nil
 }
 
+func (a *UnixAddr) toLocal(net string) sockaddr {
+	return a
+}
+
 func (c *UnixConn) readFrom(b []byte) (int, *UnixAddr, error) {
 	var addr *UnixAddr
 	n, sa, err := c.fd.readFrom(b)
@@ -173,9 +177,12 @@ func (ln *UnixListener) close() error {
 	// is at least compatible with the auto-remove
 	// sequence in ListenUnix. It's only non-Go
 	// programs that can mess us up.
-	if ln.path[0] != '@' && ln.unlink {
-		syscall.Unlink(ln.path)
-	}
+	// Even if there are racy calls to Close, we want to unlink only for the first one.
+	ln.unlinkOnce.Do(func() {
+		if ln.path[0] != '@' && ln.unlink {
+			syscall.Unlink(ln.path)
+		}
+	})
 	return ln.fd.Close()
 }
 
@@ -187,6 +194,18 @@ func (ln *UnixListener) file() (*os.File, error) {
 	return f, nil
 }
 
+// SetUnlinkOnClose sets whether the underlying socket file should be removed
+// from the file system when the listener is closed.
+//
+// The default behavior is to unlink the socket file only when package net created it.
+// That is, when the listener and the underlying socket file were created by a call to
+// Listen or ListenUnix, then by default closing the listener will remove the socket file.
+// but if the listener was created by a call to FileListener to use an already existing
+// socket file, then by default closing the listener will not remove the socket file.
+func (l *UnixListener) SetUnlinkOnClose(unlink bool) {
+	l.unlink = unlink
+}
+
 func listenUnix(ctx context.Context, network string, laddr *UnixAddr) (*UnixListener, error) {
 	fd, err := unixSocket(ctx, network, laddr, nil, "listen")
 	if err != nil {