Apache Portable Runtime
APR Error Space
Error Codes
 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
 
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