[fpc-pascal] Negative RTL Error Codes in Some Platforms

[Bihar Anwar]

On June 10, 2010 6:12:42 PM, Tomas Hajny wrote:


>OK, this is a slightly different story then. Win32 API function FindFirst
>(and thus also the Delphi function FindFirst provided in SysUtils) returns
>the "search handle" (positive value) in case of a success and -1 in case
>of an error. The implementation for OS/2 and DOS passes the error
>information directly (rather than relying on a subsequent call to
>GetLastError, which is again a Win32 API call and not directly
>transferable, or using GetLastOSError and relying on the fact that no
>other OS API has been used by the RTL in the meantime), but it needs to
>use a negative value in order to differentiate from possitive values
>meaning success. The same logic is then in turn also used for FindNext
>(although that one does never return search handles even on Windows).

Thanks Tomas, that explanation even makes me understand this FPC decision better.