The following attempts to show the relation of the various constants
 used for mapping APR Status codes.

       0

  20,000     APR_OS_START_ERROR

         + APR_OS_ERRSPACE_SIZE (50,000)

  70,000      APR_OS_START_STATUS

         + APR_OS_ERRSPACE_SIZE - APR_UTIL_ERRSPACE_SIZE (30,000)

 100,000      APR_UTIL_START_STATUS

         + APR_UTIL_ERRSPACE_SIZE (20,000)

 120,000      APR_OS_START_USERERR

         + 10 x APR_OS_ERRSPACE_SIZE (50,000 * 10)

 620,000      APR_OS_START_CANONERR

         + APR_OS_ERRSPACE_SIZE (50,000)

 670,000      APR_OS_START_EAIERR

         + APR_OS_ERRSPACE_SIZE (50,000)

 720,000      APR_OS_START_SYSERR