To fix races with graceful restarts (PR 62044).

This commit does:
1/ use a constant file name for all systems (no generation suffix which
   makes a new SHM to be created for each restart, losing previous data)
2/ maintain the list of the created SHMs accross restarts (ap_pglobal list)
3/ not unlink the files on restart anymore (otherwise we can't reuse them)
4/ not attach existing SHMs in slotmem_create() anymore (not suitable since
   those are necessarily crash remainders)
5/ add type/sizes consistency check for persisted slots on restoration
6/ unlink the files only on stop/exit or before creating them (crash recovery)

We could possibly avoid 6/ (since we don't need to re-open files now) if we
remove the file just after the SHM is created.  This would at least work for
systems with "unlink semantic" (i.e. unlink succeeds even if some descriptors
are opened, the "real" thing happening when the last one desciptor closed), but
this wouldn't work for other systems so I kept the code generic for now.



git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1822509 13f79535-47bb-0310-9956-ffa450edef68

Will follow up with an alternate fix.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1822505 13f79535-47bb-0310-9956-ffa450edef68

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1822503 13f79535-47bb-0310-9956-ffa450edef68

mod_http2: discourage gzip/brotli content encoding on http2-status responses as
     they are inserted into the reponse when filters are already done.



git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1822502 13f79535-47bb-0310-9956-ffa450edef68

core: adding defines to allow interworking with honggfuzz without
     further patches.



git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1822500 13f79535-47bb-0310-9956-ffa450edef68

80 colums.



git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1822367 13f79535-47bb-0310-9956-ffa450edef68

Export ap_queue_*() fonctions, so that they are accessible from MPMs, but
don't provide "mpm_fdqueue.h" in the API (include/).



git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1822366 13f79535-47bb-0310-9956-ffa450edef68

all platforms. Keep persisted filename as-was.

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1822341 13f79535-47bb-0310-9956-ffa450edef68

  since mk_password_hash() can use crypt().


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1822305 13f79535-47bb-0310-9956-ffa450edef68

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1822108 13f79535-47bb-0310-9956-ffa450edef68

but require user interaction until apu changes HAVE_CRYPTO default.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1821768 13f79535-47bb-0310-9956-ffa450edef68

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1821767 13f79535-47bb-0310-9956-ffa450edef68

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1821766 13f79535-47bb-0310-9956-ffa450edef68

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1821727 13f79535-47bb-0310-9956-ffa450edef68

Make the allocation and zero-ing in ap_queue_init() => ap_queue_create().



git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1821660 13f79535-47bb-0310-9956-ffa450edef68

Either error matters, simplify code.



git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1821659 13f79535-47bb-0310-9956-ffa450edef68

Be explicit in the naming about what's push/pop-ed.



git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1821651 13f79535-47bb-0310-9956-ffa450edef68

Free idle pools while stopping.



git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1821650 13f79535-47bb-0310-9956-ffa450edef68

Cosmetics, 80 cols, no functional change.



git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1821649 13f79535-47bb-0310-9956-ffa450edef68

Fix typo in comment.



git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1821648 13f79535-47bb-0310-9956-ffa450edef68

The code is not part of the API.



git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1821647 13f79535-47bb-0310-9956-ffa450edef68

The implemention wants APR_HAS_THREADS too.



git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1821644 13f79535-47bb-0310-9956-ffa450edef68

Use common [mpm_]fdqueue.



git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1821639 13f79535-47bb-0310-9956-ffa450edef68

Prepare mpm_worker to use common fdqueue.



git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1821635 13f79535-47bb-0310-9956-ffa450edef68

Clear recycled_pools_count in ap_free_idle_pools().



git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1821632 13f79535-47bb-0310-9956-ffa450edef68

Rename ap_queue_info_get_idlers() to ap_queue_info_num_idlers().



git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1821629 13f79535-47bb-0310-9956-ffa450edef68

Style, no functional change.



git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1821627 13f79535-47bb-0310-9956-ffa450edef68

Opacify fdqueue types.



git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1821626 13f79535-47bb-0310-9956-ffa450edef68

And now it's mpm_fdqueue, with minimal #includes.



git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1821625 13f79535-47bb-0310-9956-ffa450edef68

This first step moves the files server/mpm/event/fdqueue.[ch] to
server/mpm_fdqueue.[ch] (untouched for now, simple svn move).

Will follow up with the necessary changes to mpm_unix.* for common code.



git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1821624 13f79535-47bb-0310-9956-ffa450edef68

Instead of copying event/fdqueue.c code into existing mpm_unix.c, losing all
contributors (blame, since r89781 ...), will restart the series by svn-moving
event/fdqueue.[ch] to server/mpm_fdqueue.[ch] first.

The code is not really unix specific either, so this sounds better.



git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1821619 13f79535-47bb-0310-9956-ffa450edef68

Use common fdqueue.



git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1821608 13f79535-47bb-0310-9956-ffa450edef68

Prepare mpm_worker to use common fdqueue.



git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1821607 13f79535-47bb-0310-9956-ffa450edef68

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1821606 13f79535-47bb-0310-9956-ffa450edef68

Clear recycled_pools_count in ap_free_idle_pools().



git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1821605 13f79535-47bb-0310-9956-ffa450edef68

Don't crash (in listener) if we can't create the ptrans allocator.



git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1821595 13f79535-47bb-0310-9956-ffa450edef68

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1821582 13f79535-47bb-0310-9956-ffa450edef68

replace mod_socache_redis.dsp as original was corrupted


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1821581 13f79535-47bb-0310-9956-ffa450edef68

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1821562 13f79535-47bb-0310-9956-ffa450edef68

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1821561 13f79535-47bb-0310-9956-ffa450edef68