C/C++ Programmer's Guide (G06.25+)

Compiler Pragmas

HP C/C++ Programmer’s Guide for NonStop Systems—429301-008

13-97

STDFILES

The STDFILES pragma controls the automatic opening of the three standard files:

stdin, stdout, and stderr. The STDFILES pragma allows the C library to

automatically open the three standard files. The NOSTDFILES pragma suppresses the

automatic opening of these files.

The pragma default settings are:

Usage Guidelines

•

For the native compilers, the STDFILES pragma can be entered only on the

compiler RUN command line. For the TNS compilers, the pragma can be specified

with the -W[no]stdfiles flag of the c89 utility.

•

The C compiler defaults to STDFILES if pragma SYSTYPE GUARDIAN is specified.

You cannot specify the STDFILES pragma if pragma SYSTYPE OSS is specified.

The compiler issues a warning.

•

The STDFILES pragma is effective only for compiling the module that contains the

main function. These pragmas have no meaning for other modules, and the

compiler issues a warning if the pragmas are used with other modules.

•

In a mixed-language program, the three standard files are not automatically

opened unless the module containing the main function is written in the C

programming language. If you need to open any of the three standard files for I/O

operations in the C language, explicitly open each file by calling the

fopen_std_file() function.

[NO]STDFILES

SYSTYPE GUARDIAN SYSTYPE OSS

TNS C compiler STDFILES N.A.

G-series TNS c89 utility STDFILES N.A.

TNS/R native C and C++ compilers STDFILES N.A.

Native c89 utility STDFILES N.A.

TNS/E native C and C++ compilers STDFILES N.A.