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model.4 (2010 09)

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model(4) model(4)
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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 imple-
mentation 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These typedef declarations have been replaced by the header file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.
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
cc(1), cpp(1), inttypes(5), magic(4).
HP-UX 11i Version 3: September 2010 − 1 − Hewlett-Packard Company 1

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