The HPFOPEN intrinsic is the recommended intrinsic for creating and opening
files on an MPE/iX-based computer system. HPFOPEN is designed to be more
flexible and extendible than the FOPEN intrinsic. In addition, HPFOPEN's
available options are a superset of the options available through FOPEN. For
example, mapped access is available through HPFOPEN but not through FOPEN.
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 | NOTE:
One HPFOPEN option, the file privilege option, when used to set a new file's
privilege level to other than 3 (least-privileged, or user level),
disallows all subsequent access of that file by the FOPEN intrinsic. (For
compatibility reasons, FOPEN can only access a file whose file privilege level
is three.) |
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You should use the FOPEN intrinsic only if you are planning to
migrate your application between MPE/iX-based systems and MPE V/E-based
systems. HPFOPEN is not supported on an MPE V/E-based system.
The examples in this chapter illustrate the use of the HPFOPEN intrinsic. The
HPFOPEN intrinsic uses an itemnum, item pair convention for optional parameter
passing. The itemnum and item parameters are paired, where the nth itemnum is
immediately followed in the parameter list by the nth item. The itemnum
parameter passes by value an integer that the intrinsic uses to define the
meaning and expected data type of the value passed by reference in the
corresponding item parameter.
For details on HPFOPEN and FOPEN parameters, refer to the respective intrinsics
descriptions in the MPE/iX Intrinsics Reference Manual (32650-90028).
