C/C++ Programmer's Guide (G06.27+, H06.08+, J06.03+)

• Working Paper for Draft Proposed International Standard for Information Systems–Programming
Language C++. X3, Information Processing Systems. 2 Dec 1996. X3J16/96-0225
WG21/N1043 (the standard on which the NonStop VERSION2 of the Standard C++ Library
is based).
• International Standard ISO/IEC 14882:1998(E) Programming Languages -- C++ (the 1998
standard on which the NonStop VERSION3 of the Standard C++ Library is based).
• International Standard ISO/IEC 14882:2003(E) Programming Languages -- C++ (a newer
standard).
HP includes several extensions to ISO/ANSI standard C that make C an effective language for
writing applications that execute under the HP NonStop OS. Some of these features are:
• Access to several types of physical files
There is an extensive set of I/O library routines that enable you to access many different types
of physical files, including:
◦ C disk files, which are odd-unstructured files and have a file code of 180
◦ EDIT disk files, which have a file code of 101
◦ Processes
◦ Terminals
◦ $RECEIVE
• Two file-reference models
There are two sets of input and output routines; each set has its own method of tracking,
maintaining, and referring to a file. These methods are called file-reference models, they are:
◦ The ANSI model, which uses FILE pointers to identify files
◦ The alternate or UNIX-style model, which uses file descriptors to identify files
With two file-reference models available, you can select the model whose I/O services
best suit the needs of your application. For more details, see Chapter 4: Using the C
Run-Time Library.
• Access to Guardian system procedures
Call procedures in the Guardian system library using the cextdecs header file in the Guardian
environment or the cextdecs.h header file in the OSS environment and PC environment.
• Access to Open System Services system calls and library calls
Call routines that are part of the Open System Services library.
• Access to procedures written in other languages
TNS programs can call procedures written in C, C++, TNS COBOL, FORTRAN, D-series
Pascal, and TAL. Native programs can call procedures written in C, C++, native COBOL,
and pTAL.
• Access to a NonStop SQL/MP database or a NonStop SQL/MX database
Your TNS/R native C or C++ program can interface to a NonStop SQL/MP or NonStop
SQL/MX database using embedded SQL.
• Fault-tolerant programs
Write fault-tolerant process pairs using the active backup programming model.
44 Introduction to HP C and C++ for NonStop Systems