DosSysCtl

Syntax

DosSysCtl(ULONG func, ULONG p);

Remarks

It is not declared in the headers but it is in the standard import libraries (DOSCALLS.876). The DosSysCtl function may be used for detecting whether we're being debugged or not.

Check also Query the DosError() state.

Sample Code

APIRET APIENTRY DosSysCtl(ULONG func, ULONG p);

        ULONG SavedDosError = 1;
        DosSysCtl((ULONG)27, (ULONG)&SavedDosError);
        DosError(0L);    //FERR_DISABLEHARDERROR
...
        DosError(SavedDosError);