DosSysCtl

Legacy Function Warning
It is recommended to use a newer replacement for this function.
Replacement:
Remarks:	This page list the older version of the function for reference.

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);