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From Bill Stoddard <>
Subject Re: patch to mod_arm4
Date Wed, 21 Sep 2005 21:28:59 GMT
Kai Engels wrote:
> Hello,
> I write to this address since I have made some changes to the mod_arm4 
> module which I hope you will find usefull.
> Patch it by unzipping the patch, changing into the mod_arm4 directory 
> and say
> patch -p1 < mod_arm4_20052009.patch
> Then change to the mod_arm4 source directory and say
> autoreconf -ivf
> ./configure
> make
> make install
> This should do the job. Check if apxs is in your PATH, otherwise use 
> "--with-apxs=path/where/apxs/is".
> --------------------------------------
> My changes are:
> 1. added a configure structure to the module
> 2.  added a new metric to each transaction which allows to measure the 
> amount of bytes sent during that transaction. I currently use the 
> variable "bytes_sent" from the request_rec structure. I also tried 
> "clength" but it seemed not to give as good results as "bytes sent". 
> Maybe you guys can give me a hint which of them better suites my needs 
> since I made my decision on "try and error" but was not sure what 
> exactly each variable contains.
> 3. Added the environment variable "ARM_CORRELATOR" with the current 
> stringified correlator to the "subprocess_env" table in order to be able 
> to hand over the correlator to other processes (e.g. cgi scripts, 
> databases etc.). The apache server transaction can then be identified as 
> parent transaction  by these processes (in case they interpret this 
> environment variable). I have currently instrumented sqlite and used the 
> same mechanism for this purpose.
> I did not fix yet all compiler warnings (since I am not sure what 
> "warning: dereferencing type-punned pointer will break strict-aliasing 
> rules" exactly means). How shall I handle future changes to this module 
> (e.g. above mentioned compiler warnings)? Send them to this list again?
> BTW: Is the arm4 module not listed on  Or did I just 
> not see it?
> Greetings
> Kai

mod_arm4 is not on  Thanks for the patch, I'll review it 'soon'. Bug me
if I don't get to 
it within a week.


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