check apache process [suspect spam source]

[kengheng <kengheng@xxxxxxxx>]

Recently I notice my mail server got a lot spam generated from httpd 
process, I using pstree to trace the spam httpd instance, below is the 
result

       |-httpd(28714)-+-httpd(5986)
       |              |-httpd(20355)
       |              
|-httpd(29153)---qmail-inject(9294)---qmail-queue(9299)
       |              |-httpd(1874)
       |              |-httpd(1960)
       |              |-httpd(3988)
       |              |-httpd(4790)
       |              
|-httpd(5662)---qmail-inject(9295)---qmail-queue(9298)

I would like to know how to refer to the access_log against the process 
id, eg |-httpd(29153)---qmail-inject(9294)---qmail-queue(9299) ?

Thanks.

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