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

5-10

©

 National Instruments Corporation

Under the ANSI C standard, the programmer who implements the library chooses how certain 
functions behave. As a result, two implementations of a function can behave differently and 
still conform to the ANSI standard. Because LabWindows/CVI now uses the Sun Solaris C 
library, incompatibilities arise from the following sources:

•

Differences between LabWindows/CVI and the ANSI standard

•

Differences between LabWindows/CVI and the Sun Solaris standard

This section outlines these incompatibilities.

The following incompatibilities exist between LabWindows/CVI and ANSI C:

•

LabWindows/CVI for Solaris 1 defines 

size_t

 as a signed integer instead of an 

unsigned integer as the ANSI C standard requires. National Instruments uses the 
signed integer definition to make LabWindows/CVI compatible with the Sun Solaris 
header files.

•

LabWindows/CVI for Solaris 1 uses the Sun Solaris version of the ANSI function 

strftime

, which incorrectly interprets the "

%W

" control string as the one-based week 

number instead of the zero-based week number as ANSI specifies.

•

In LabWindows/CVI for Solaris 1, 

ungetc

 works improperly in certain cases:

-fsetpos

 fails to erase all memory of pushback characters by 

ungetc

.

-ungetc

 does not clear the end-of-file indicator on success.

-ungetc

 fails in certain cases after reading to the end of a file.

•

In LabWindows/CVI for Solaris 1, signal handlers you install with the 

signal

 function 

remain installed after invocation of the handler. The ANSI standard specifies that these 
handlers be removed before they are invoked.

•

In standalone executables LabWindows/CVI creates for Solaris 1, the function 

abort

 

and the macro 

assert

 do not terminate the program if you install a signal handler for the 

SIGABRT

 signal and the handler returns rather than calling 

longjmp

. The ANSI standard 

specifies that the program terminate in these cases.

•

Under some versions of Sun Solaris 2 (for example, Solaris 2.5), the ANSI function 

setlocale

 does not work properly when running programs in the LabWindows/CVI 

development environment. LabWindows/CVI links programs in the development 
environment to the Sun Solaris static library 

libc.a

, which contains a limited version 

00ProRef.book : 06chap05.fm  Page 10  Monday, March 9, 1998  3:23 PM