mod_md v1.1.8: new configuration directive "MDBaseServer on|off" to allow/inhibit 
     management of the base server domains outside VirtualHosts. By default, this is "off", 
     e.g. mod_md will not manage certificates or perform https: redirections on the 
     base server.


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This tweaks accept() failure processing by having ap_unixd_accept
pass more errors up, and having the MPM's check against a macro
to see if they are in a whitelist of non ENETDOWN/EMFILE kind 
of potential process-wide errors.

Default behavior is still to exit.



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10112 is wasted because it is in my tree only.

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Such that it cleans up the buckets while they are consumed and bails out
appropriately on EOS.



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ap_regexec() wants NUL terminated strings, so use ap_regexec_len() instead.



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To determine whether or not HTML data are lower than 4 bytes, use a retain
buffer rather than assuming that all should be contained in a single bucket
with the next one being EOS (if any).



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Fixed gcc warnings in latest mod_md version.



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 - providers are case sensitive
 - description didn't match example / 2.2 didn't match 2.4.

Submitted by: Hank Ibell
Committed by: covener



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When listening sockets are disabled (too many connections) and the number of
workers / active connections comes back below the limit, we need to wake up
the listener to re-enable them.

Add a new connections_above_limit() helper to determine when this applies.



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mod_md v1.1.7 changes


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It's always updated under the timeout_mutex lock, or read for logging and
scoreboard updates (not critical).

For the read cases a volatile access is enough, while removing the atomic ops
for the already protected write cases saves cycles and context switches.



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Make sure the worker factor is at least one (w.r.t. WORKER_FACTOR_SCALE), and
use it to size the pollset appropriately (including K-A and lingering close
connections), in addition to the listening sockets.



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Even if the listener thread is not created yet (i.e. about to be), we must
still tell it to leave, and terminate the worker queue in any case.



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Make sure the compiler doesn't play games with our synchronization variables
by marking them volatile.



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xform


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Align mod_http2 with expected returned state from process_connection hooks in
async MPMs.
When the master connection is handled, enter CONN_STATE_LINGER in any case.



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Be more correct in comment about CONN_STATE_WRITE_COMPLETION.
We currently have/need no state to simply wait for readability on a socket,
so the previous comment was misleading. Write completion can't be used for
a simple "wait for read event and come back to process_connection hooks".



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Allow DONE as a successful ap_run_process_connection() return value, for
instance h2_conn_run() and h2_task_process_conn() uses it, third-party
modules may too...



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Align comment and fix typos.



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