If an error occurs during the operation of any OS/390 Native request, a SrvFileError object is answered back to your program. For example, to test if an open request has succeeded, you could code it as the following:
| file | (file := SrvBasicFileDescriptor open: 'FILEEX' mode: 'READ') isSrvFileError ifTrue: [Transcript cr; show: 'Open error code: ', file rc printString].
See OS/390 Native error codes for a description of the error codes associated with OS/390 Native.