Implement a "graceful-stop" for the prefork MPM (might aswell do the hard one
first). 

General approach is to send SIGUSR1 to all children (which will de-listen, and
exit when finished), and to gather all children as they exit. 

We don't use a sleep(timeout) for the timeout implementation, because this
would lead to a rut of defunct children until the timeout had expired.

set_graceful_shutdown stolen from Ken Coar. See <3E84B1EC.3050007@Golux.Com>
(28 Mar 2003).



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Make the neccessary changes to mpm_common and main to support a graceful-stop
command line argument. 



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Remove the note about WINCH on certain platforms. As of r239430, this is no
longer the case and USR1 will be used on all platforms.



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for the same port, switch them so that the bind to [::] is attempted
first.

Submitted by: colm, jorton


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(open_listeners): Simplify using the new macros; no functional change.


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A very minor, but particularly annoying whitespace fix. It took me 15 minutes
to try and parse what was going on :-)



git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@240089 13f79535-47bb-0310-9956-ffa450edef68

Update the documentation for the ScriptSock directive to match the
.PID extension.



git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@240049 13f79535-47bb-0310-9956-ffa450edef68

Append the .PID to the ScriptSock filename. This change ensures that multiple
running instances of httpd will not clobber each others script sockets. 

Because a different socket will be created for each instance, this change also
unlinks the script-socket on exit, to prevent pollution. 

unlink() happens from within the parent process, since the change in userid's
means the cgid process likely won't have the correct permissions.



git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@240044 13f79535-47bb-0310-9956-ffa450edef68

nit: Consistently CamelCase "ScriptSock".



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Implement "de-listening" in the worker MPM. Fixes PR28167.  Comments in CHANGES
file also cover r239710-1. 



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Correct the function prototype/declaration 



git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@239732 13f79535-47bb-0310-9956-ffa450edef68

Implement "de-listening" for graceful restarts with the prefork MPM. With this
change;

  1.) httpd -k graceful sends SIGUSR1 to the parent pid, which in turn
      sends SIGUSR1 to all of the active children,

  2.) Active children each close their copy of listener fd's.

This means that the listening sockets are freed for re-use. In the ordinary
case, this makes no difference. However if for example admin changes "Listen
80" to "Listen 81" in the config, this rev makes port 80 immediately available
(no waiting for the graceful children to die).



git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@239711 13f79535-47bb-0310-9956-ffa450edef68

Provide a function for closing all of the listeners. 

  * This is useful for properly implementing a graceful stop and restart
    where we want child processess to be able to carry on serving a request 
    but "de-listen" from a port. So that another instance entirely can be 
    started in our place, or to unbind from a "Listen" directive an admin 
    has removed from the configuration.



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Remove over-zealous and invalid use of <indent></indent> in the Caching
User-guide.



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A first take at a User-Guide for caching. Covers mod_cache and mod_file_cache,
and tries to place the caching modules in context.



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cache header files.



git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@239436 13f79535-47bb-0310-9956-ffa450edef68

graceful restart signal. Frees up SIGWINCH for implementing graceful stop.
See <20050727114058.GA3390@stdlib.net> and subsequent thread on httpd-dev.



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Enhance CacheEnable/CacheDisable to control caching on a per-protocol, per-host
and per-path basis. Makes Cache(En|Dis)able useful for forward proxy servers.



git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@239421 13f79535-47bb-0310-9956-ffa450edef68

remove some unused variables and re-name cache_select_url() to simply 
cache_select()



git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@239420 13f79535-47bb-0310-9956-ffa450edef68

Improve the cache hit/miss ratio by canonicalising the url key. hostname's
are matched case-insensitively, port-based vhosts are catered for and the
scheme included for future multi-scheme caching compatibility.



git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@239407 13f79535-47bb-0310-9956-ffa450edef68

to allow inclusion of mod_disk_cache.h in htcacheclean.c.


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mod_disk_cache.h, an all-round better solution, but for now just fix the
bug.



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