ueventd.rc: Document the different rule formats for /dev and /sys nodes
This was causing some confusion during shark bringup and we weren't able
to find docs online, so let's add some hints at the top of the file in
case it comes up again.
Change-Id: Ica2cd8a0fb28efb99077fdc98673dbbdd6f58ff6
Signed-off-by: Kevin Cernekee <cernekee@google.com>
diff --git a/rootdir/ueventd.rc b/rootdir/ueventd.rc
index 9cf9ed9..951b22d 100644
--- a/rootdir/ueventd.rc
+++ b/rootdir/ueventd.rc
@@ -1,6 +1,13 @@
subsystem adf
devname uevent_devname
+# ueventd can only set permissions on device nodes and their associated
+# sysfs attributes, not on arbitrary paths.
+#
+# format for /dev rules: devname mode uid gid
+# format for /sys rules: nodename attr mode uid gid
+# shortcut: "mtd@NN" expands to "/dev/mtd/mtdNN"
+
/dev/null 0666 root root
/dev/zero 0666 root root
/dev/full 0666 root root