Stephen R. van den Berg wrote:

Is there a callback when main() returns with -1 and drops into the DefaultBackend?

If there is not, can we create one?

After an unsuccessful tour through the innards of Pike, looking for the spot where this happens; I decided to compromise by simply calling call_out(mycallback, 0).

It should be called whenever the DefaultBackend is started; it might be fooled by someone calling it only a few times earlier though.