Apache Portable Runtime Utility Library
Status Value Tests
For any particular error condition, more than one of these tests may match. This is because platform-specific error codes may not always match the semantics of the POSIX codes these tests (and the corresponding APR error codes) are named after. A notable example are the APR_STATUS_IS_ENOENT and APR_STATUS_IS_ENOTDIR tests on Win32 platforms. The programmer should always be aware of this and adjust the order of the tests accordingly.