Add init fragment for hostapd on Android

This fragment defines how the Android init system should start hostapd
as a standalone service. Previously, hostapd was fork/exec'd from
Android's netd. This left hostapd with some dangling file descriptors
and a process parent minimally interested in acting as init for child
processes.

Signed-off-by: Christopher Wiley <wiley@google.com>

hostapd/Android.mk

@@ -995,6 +995,7 @@ endif
 LOCAL_CFLAGS := $(L_CFLAGS)
 LOCAL_SRC_FILES := $(OBJS)
 LOCAL_C_INCLUDES := $(INCLUDES)
+LOCAL_INIT_RC := hostapd.android.rc
 include $(BUILD_EXECUTABLE)
 
 endif # ifeq ($(WPA_BUILD_HOSTAPD),true)

hostapd/hostapd.android.rc

@@ -0,0 +1,20 @@
+#
+# init.rc fragment for hostapd on Android
+# Copyright (c) 2002-2016, Jouni Malinen <j@w1.fi>
+#
+# This software may be distributed under the terms of the BSD license.
+# See README for more details.
+#
+
+on post-fs-data
+    mkdir /data/misc/wifi/hostapd 0770 wifi wifi
+
+service hostapd /system/bin/hostapd \
+        -e /data/misc/wifi/entropy.bin \
+        /data/misc/wifi/hostapd.conf
+    class main
+    user wifi
+    writepid /data/misc/wifi/hostapd.pid
+    group wifi
+    disabled
+    oneshot