model(4)                                                           model(4)
                               TO BE OBSOLETED



 NAME    [Toc]    [Back]
      model - HP-UX machine identification

 SYNOPSIS    [Toc]    [Back]
      #include <model.h>

 DESCRIPTION    [Toc]    [Back]
      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.

      These typedef declarations have been replaced by the header file
      inttypes.h

           int8, u_int8                  Signed and unsigned 8-bit integral
                                         type.



 Hewlett-Packard Company            - 1 -   HP-UX 11i Version 2: August 2003






 model(4)                                                           model(4)
                               TO BE OBSOLETED



           int16, u_int16                Signed and unsigned 16-bit integral
                                         type.
           int32, u_int32                Signed and unsigned 32-bit integral
                                         type.
           machptr, u_machptr            Signed and unsigned integral type
                                         large enough to hold a pointer.

      To port code to use inttypes.h instead of model.h, these are the
      corresponding definitions contained in intypes.h

           int8_t, uint8_t               Signed and unsigned 8-bit integral
                                         types.
           int16_t, uint16_t             Signed and unsigned 16-bit integral
                                         types.
           int32_t, uint32_t             Signed and unsigned 32-bit integral
                                         types.
           intptr_t, uintptr_T           Signed and unsigned integral large
                                         enough to hold a pointer.

      Certain C preprocessor conditional compilation variables are defined
      to aid in implementation-dependent code.  See cpp(1).

 SEE ALSO    [Toc]    [Back]
      cc(1), cpp(1), inttypes(5), magic(4).


 Hewlett-Packard Company            - 2 -   HP-UX 11i Version 2: August 2003