Revert "Revert "Remove a misleading "flush" function.""

This reverts commit 47da17740520f3d6ba952c65593f8660b89b8abf.

Reason for revert: Fixed the test broken by the original commit

Bug: 139192244
Bug: 140336855

Test: m -> flash -> boot
Test: atest CtsJvmtiAttachingHostTestCases

Change-Id: I4c67ad8709652c4710ef24564e0240f74f817f8c

1 files changed, 0 insertions, 34 deletions

diff --git a/core/java/android/net/LocalSocketImpl.java b/core/java/android/net/LocalSocketImpl.java
index fe7632c25445..b066a15106af 100644
--- a/core/java/android/net/LocalSocketImpl.java
+++ b/core/java/android/net/LocalSocketImpl.java
@@ -157,40 +157,6 @@ class LocalSocketImpl
                 write_native(b, myFd);
             }
         }
-
-        /**
-         * Wait until the data in sending queue is emptied. A polling version
-         * for flush implementation.
-         * @throws IOException
-         *             if an i/o error occurs.
-         */
-        @Override
-        public void flush() throws IOException {
-            FileDescriptor myFd = fd;
-            if (myFd == null) throw new IOException("socket closed");
-
-            // Loop until the output buffer is empty.
-            Int32Ref pending = new Int32Ref(0);
-            while (true) {
-                try {
-                    // See linux/net/unix/af_unix.c
-                    Os.ioctlInt(myFd, OsConstants.TIOCOUTQ, pending);
-                } catch (ErrnoException e) {
-                    throw e.rethrowAsIOException();
-                }
-
-                if (pending.value <= 0) {
-                    // The output buffer is empty.
-                    break;
-                }
-
-                try {
-                    Thread.sleep(10);
-                } catch (InterruptedException ie) {
-                    break;
-                }
-            }
-        }
     }
 
     private native int read_native(FileDescriptor fd) throws IOException;