This directive is used only if ServerType is standalone. 
PidFile file 
file is the name of the file to which the process id is
logged. It is either a full pathname, or a partial pathname
relative to ServerRoot. 
Only one PidFile directive is allowed in the configuration file.
PidFile logs/httpd.pid 
Compile Option: DEFAULT_PIDLOG
PidFile logs/pid This logs the process id to the file logs/pid in the ServerRoot directory.
PidFile /tmp/httpd-pid 
This logs the process id to the file /tmp/httpd-pid. 
PidFile /dev/null 
The server does not log its process id.
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