r1831394 is the right follow to r1830800 to preserve "inherited" slotmems in
children processes.

While at it, comment on the expectations from mod_proxy_balancer w.r.t.
slotmem_attach() implementations, and eventually how we could improve the API
later (w/o backporting to 2.4.x).



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The caller might (and actually balancer_child_init() does) rely on
slotmem_attach() to not mangle the passed in/out slotmem pointer on
failure.



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Don't call slotmem_attach() if the slot is already initialized/reused, that
used to work previously because the returned error status is ignored, but
r1830800 changed the function to forcibly reset the returned slot pointer to
NULL first.

There is no point to call slotmem_attach() in this case, the slot is already
initialized because it's either inherited/fork()ed on Unixes, or on Windows
the attachment happened in post_config/slotmem_create() already.

One case where slotmem_attach() would fail is when balancers are defined
globally (main server) and some virtualhosts don't have/use any mod_proxy
configuration/directive. In this case their proxy server config is a pointer
copy of the main server thus their slots are already initialized in both
post_config and child_init hooks. While the case was already handled in
the balancer_post_config(), it did not in balancer_child_init() where we
relied on slotmem_attach() to be a noop.



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  logno. Free EVP_PKEY in engine case.  Never try reading ECDH/DH
  parameters from engine ids.


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I had to disable -Werror in maintainer mode for this file in darwin :/



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engine.

* modules/ssl/ssl_util.c (modssl_is_engine_id): Renamed
  from modssl_is_engine_key.
  
* modules/ssl/ssl_engine_config.c (ssl_cmd_SSLCertificateKeyFile):
  Adjust accordingly.
  (ssl_cmd_SSLCertificateFile): Also allow ENGINE cert ids.

* modules/ssl/ssl_engine_pphrase.c (modssl_load_engine_keypair):
  Rename from modssl_load_engine_key; load certificate if
  cert id is passed.

* modules/ssl/ssl_engine_init.c (ssl_init_server_certs): Optionally
  load the certificate from the engine as well.

* docs/manual/: Update manual.


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related to PR60296 investigation

RMM corruption is really nasty, so abort on locking failures.





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Use apr_pstrmemdup instead of apr_pstrndup when possible.

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Use apr_pstrmemdup instead of apr_pstrndup when possible.
Avoid scanning the first 2 bytes when looking for the | delimiter. it is known to be "${".
Avoid comma separated statements, it is not that usual.

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to cache serialized EVP_PKEYs not any char * blobs), and document.

* modules/ssl/ssl_util.c (ssl_asn1_table_set): Take the EVP_PKEY and
  serialize internally.  Use ap_realloc.  Return the ssl_asn1_t *
  pointer.  Don't call apr_hash_set() for unchanged pointer case.

* modules/ssl/ssl_engine_pphrase.c (ssl_load_encrypted_pkey):
  Adjust for the above.

* modules/ssl/ssl_private.h: Adjust as above, add docs.


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  second argument.

* modules/ssl/ssl_engine_pphrase.c (ssl_load_encrypted_pkey): Adjust
  accordingly.


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  Remove modssl_read_encrypted_pkey() and helpers, added in r1804087
  but never used.


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consistency.


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  Simplify code, no functional change.


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for PKCS#11 URIs only, and PIN entry is not threaded through
SSLPassPhraseDialog config yet.

* modules/ssl/ssl_util.c (modssl_is_engine_key): New function.

* modules/ssl/ssl_engine_config.c (ssl_cmd_SSLCertificateKeyFile):
  Use it, skip check for file existence for engine keys.

* modules/ssl/ssl_engine_pphrase.c (modssl_load_engine_pkey):
  New function.

* modules/ssl/ssl_engine_init.c (ssl_init_server_certs):
  For engine keys, load via modssl_load_engine_pkey.

Submitted by: Anderson Sasaki <ansasaki redhat.com>, jorton


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Modifying the number of proxy balancers or balancer members on restart
could have prevented the server to load, notably on Windows.  PR 62308.

The generation number integrated in the SHM filename allows to create a
new/resized SHM while the previous is still in use by previous generation
gracefully shutting down (Windows prevents SHM/file to be removed in this
case, but even on Unix(es) an unlinked file might not be re-openable while
an inode exists). The generation number is added/incremented only if the
size requirement changed, such that unrelated restarts continue to share
SHMs between generations.

The cleanup handling is also simplified because both the parent process and
the Windows child process need to cleanup everything on exit. This translates
to cleanup_slotmem() being always registered but in the dry load state
(AP_SQ_MS_CREATE_PRE_CONFIG), for both cases still.



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  config_vars.mk.


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  for a DSO build.


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Proposed by: Ewald Dieterich <ewald mailbox.org>
Reviewed by: ylavic



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Also adds a comment and a CHANGES entry.


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mod_http2: restoring the v1.10.16 keepalive timeout behavioud of mod_http2 (to be verified).



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mod_http2: adding an abort function to slave connections' pools, so out-of-memory
     events lead to a control process abort, as on HTTP/1.x connections.



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Use below pending_data logic for EOS bucket.
This closes #48


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