Add logcat2hvc service to redirect logcat to hvc

Logcat2hvc service redirects logcat message to HVC (Hyperv Console)
device, this is a debug purpose service for CrosVM Celadon Windows.

Signed-off-by: Yadong Qi <[email protected]>
Tracked-On: OAM-114661

logcat2hvc/Android.bp

@@ -0,0 +1,21 @@
+//
+// Copyright (C) 2023 Intel Corporation
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at                                                                                                                                //
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+sh_binary {
+    name: "logcat2hvc",
+    src: "logcat2hvc",
+    init_rc: ["logcat2hvc.rc"],
+    required: ["logcat2hvc"],
+}

logcat2hvc/logcat2hvc

@@ -0,0 +1,12 @@
+#! /system/bin/sh
+
+# Start logcat then if logcat exits, restart from the most recently
+# logged log, such that duplicates are not sent when restarting.
+
+[ ! -c /dev/hvc0 ] && exit -1
+
+logcat "$@"
+
+while true; do
+    logcat -T1 "$@"
+done

logcat2hvc/logcat2hvc.rc

@@ -0,0 +1,8 @@
+service logcat2hvc /system/bin/logcat2hvc -b all -v threadtime -f /dev/hvc0 *:V
+    group system
+    oneshot
+
+#on property:logd.ready=true
+
+on init
+    start logcat2hvc