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value of the max_bytes_{read,written}_per_iteration variables. I think
that setting them to an arbitrary high number should be enough to make
libdbus work with edge triggered epoll. Am i correct ? And how could i
change these variables ?

The alternative would be to call the (wrapped) dbus_watch_handle()
repeatedly until the fd is not readable/writable anymore, but that would
be an ugly hack to busyloop like that, considering it shouldn't be hard
to make libdbus work with edge triggered watches.