This call returns the current mode of the processor, whether the processor is running in the DOS mode or the OS/2 mode. This allows an application to determine whether a dynamic link call is valid or not.
- MachineMode (PBYTE) - output: Address of the value to indicate the current processor mode. This value may be:
- 0 - DOS (real) mode
- 1 - OS/2 (protected) mode.
- rc (USHORT) - return
Return code description is:
- 0 NO_ERROR
All dynamic link calls are available to an application if the MachineMode value indicates the program is in OS/2 mode. This method provides a self-tailoring application that allows the application to adapt to the execution environment by limiting or enhancing the functions it provides.
If the MachineMode value indicates the program is in DOS mode (or real), the application is limited to a subset of dynamic link calls listed in the Family API.
#define INCL_DOSMISC USHORT rc = DosGetMachineMode(MachineMode); PBYTE MachineMode; /* Processor mode (returned) */ USHORT rc; /* return code /*/
EXTRN DosGetMachineMode:FAR INCL_DOSMISC EQU 1 PUSH@ BYTE MachineMode ;Processor mode (returned) CALL DosGetMachineMode
Text based on http://www.edm2.com/index.php/DosGetMachineMode