/usr/sbin/dtrace -q -Z -32 -n '
/*
# Program: Print response codes <responsecodes.d>
#
# Author: Matty <matty91 at gmail dot com>
#
# Current Version: 0.1a
#
# Revision History:
#  Version 0.1a
#
# Last Updated: 11-25-2005
#
# Purpose: Prints the aggregate values of response codes.
#
# Installation:
#   Copy the shell script to a suitable location
#
# CDDL HEADER START
#  The contents of this file are subject to the terms of the
#  Common Development and Distribution License, Version 1.0 only
#  (the "License").  You may not use this file except in compliance
#  with the License.
#
#  You can obtain a copy of the license at Docs/cddl1.txt
#  or http://www.opensolaris.org/os/licensing.
#  See the License for the specific language governing permissions
#  and limitations under the License.
# CDDL HEADER END
#
# Example:
#  $ responsecodes.d
#  Sampling response code data (Ctrl-C to stop):
#  Response Code  Count
#  404            4                  
#  200            22     
#
#
*/

dtrace:::BEGIN
{
    printf("Sampling response code data (Ctrl-C to stop and print):\n");
}

::apache_log_request:log-request
{
    this->responsecode = (int)*(uintptr_t *)copyin(arg0 + 68,sizeof(int));
    @responsecodes[this->responsecode] = count();
}

dtrace:::END
{
   printf("Response Code  Count\n"); 
   printa("%-13d  %-@19d\n",@responsecodes);

   trunc(@responsecodes);
}'