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The pages on this site contain documentation for very old MS-DOS software, purely for historical purposes. If you're looking for up-to-date documentation, particularly for programming, you should not rely on the information found here, as it will be woefully out of date.

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  Variable:  _osmajor, _osminor, _osmode, _osversion
 
  Include:   <stdlib.h>
             <dos.h>     (_osversion only)
 
  Syntax:    extern unsigned char _near _cdecl _osmajor;
             extern unsigned char _near _cdecl _osminor;
             extern unsigned char _near _cdecl _osmode;
             extern unsigned _near _cdecl _osversion;
 
     The _osmajor and _osminor variables specify the version number of
     DOS or OS/2 currently in use. They are declared in STDLIB.H. The
     _osversion variable, declared in DOS.H, provides the complete
     version number. The _osmajor variable holds the major version
     number, and the _osminor variable stores the minor version number.
     Thus, under DOS version 3.20, _osmajor is 3 and _osminor is 20.
 
     These variables are useful when you want a program to run on
     different versions of DOS. For example, you can test the _osmajor
     variable before making a call to sopen; if the major version
     number is earlier (less) than 3, open should be used instead of
     sopen.
 
     The _osmode variable indicates whether your program is running in
     real mode (DOS) or protected mode (OS/2). It contains the constant
     value DOS_MODE if the program is running in real mode, or OS2_MODE
     if it is running in protected mode.