how to make on property:xxx=* get act only when property changed?

[yf...@mobvoi.com]

In my init.project.rc file, I observe a property by doing this:

on property:persist.sys.test=*

    start testservice

my purpose is to run testservice each time when persist.sys.test changed, but testservice will also get act when system reboots. Is there any way I can make this as what I want?

[Yafei Liu]

I'v read the init.c and found out if form like "=*", each time property is set, the target will triger.

I'v modifid the code to add a new trigger to ensure being called when property is actually chaned, since this won't be merged by google, I did not borth uploading it. Any one who is interested this could ask me for a patch

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