Calling sd_bus_process with second parameter as sd_bus_message** will
put a new message in to that pointer. The man page says that the caller
should unref it ,however, I found out that if you do that it will get
garbage collected before a callback registed with sd_bus_call_async
will get a chance to access it.
Even passing NULL to the second parameter will corrupt callbacks.
Is this documentation issue? Is it correct to refernce the new message
with sd_bus_process and when not touch its refrence count until the
callback has a chance to access it? Does the callback get a new
reference so it should unrefrence it twice?
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