HPUX model[4]

 model(4)                                                           model(4)





 NAME
      model - HP-UX machine identification

 SYNOPSIS
      #include <model.h>

 DESCRIPTION
      There are certain inevitable distinctions between HP-UX
      implementations due to hardware differences.  Where such distinctions
      exist, conditional compilation or other definitions can be used to
      isolate the differences.  Flags and typedefs to resolve these
      distinctions are collected in the <model.h> header file which contains
      constants identifying various HP-UX implementations.

      For example, header file model.h contains the following constants
      whose values are defined in <sys/magic.h>:

           #define   HP_S_500   HP9000_ID
           #define   HP_S_200   HP98x6_ID
           #define   HP_S_300   CPU_HP_MC68020
           #define   HP_S_800   CPU_PA_RISC1_0
           #define   HP_S_700   CPU_PA_RISC1_1

      Other such constants are added as appropriate when HP-UX extends to
      other machines in subsequent releases.

      In addition, model.h has a statement defining the preprocessor
      constant MYSYS to represent the specific implementation for which
      compilation is desired.  MYSYS is always equal to one of the constants
      above.

      Conditional compilation can be used to adapt a single file for
      execution on more than one HP-UX implementation if the file contains
      implementation- or architecture-dependent features.  For example, the
      code segment:

           #if MYSYS==HP_S_400
               <statements>
           #endif

      causes statements following the if statement to be compiled only if
      the system processor is an HP 9000 Series 400 machine.

      model.h also contains typedefs for several predefined types to enhance
      portability of certain types of code and files.

           int8, u_int8             Signed and unsigned 8-bit integers.
           int16, u_int16           Signed and unsigned 16-bit integers.
           int32, u_int32           Signed and unsigned 32-bit integers.
           machptr, u_machptr       Signed and unsigned integers large
                                    enough to hold a pointer.



 Hewlett-Packard Company            - 1 -     HP-UX Release 9.0: August 1992






 model(4)                                                           model(4)





      Certain C preprocessor conditional compilation variables are defined
      to aid in implementation-dependent code.  See cpp(1).
 SEE ALSO
      cc(1), cpp(1), magic(4).


















































 Hewlett-Packard Company            - 2 -     HP-UX Release 9.0: August 1992