National Instruments 320685D-01 ユーザーズマニュアル

Chapter 5

UNIX Compiler/Linker Issues

LabWindows/CVI Programmer Reference Manual

5-4

©

 National Instruments Corporation

The C library that comes with Sun Solaris 1 (SunOS 4.1.x) does not comply with the ANSI C 
standard as follows:

•

Some ANSI C functions are missing from the library.

•

Some library functions have different behavior than the ANSI standard specifies.

LabWindows/CVI corrects these problems by adding a library, 

libcfix.a

, that 

replaces and supplements the Sun Solaris library as necessary. The 

 section contains more information about how LabWindows/CVI provides an 

ANSI C library on Solaris 1.

Although the Sun Solaris libraries provide the ANSI C family of functions for formatted input 
and output (

scanf

, 

printf

, and others), LabWindows/CVI provides special versions of 

these functions for the following reasons:

•

The LabWindows/CVI versions of these functions provide run-time error checking not 
available with Sun Solaris versions.

•

The Sun Solaris 1 version of these functions do not comply fully with the ANSI C 
standard.

•

The Sun Solaris versions of these functions do not work with the LabWindows/CVI 
implementation of the long double data type.

For standalone executables, these functions come in a separate static library, 

libcviprintf.a

, in the 

lib

 subdirectory of the LabWindows/CVI installation directory. 

When you create an executable in LabWindows/CVI, LabWindows/CVI links your program 
to this static library.

If your program calls any functions from the LabWindows/CVI libraries, you must call 

InitCVIRTE

 to initialize the libraries from the executable. This function takes three 

arguments. The first and third arguments to this function must always be 0 for UNIX 
applications. The second must be the same value as the second parameter of your 

main

 

function. 

InitCVIRTE

 returns 0 if it fails. 

You do not have to call 

InitCVIRTE

 when you run your program in the LabWindows/CVI 

development environment because LabWindows/CVI always initializes the libraries. 
However, if you do not call 

InitCVIRTE

, your executable cannot work. For this reason, 

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