Mac Forum / Programming / CodeWarrior / November 2005

I am porting a CFM Carbon project from CW 8.3 to CW 9.5, and I am
getting errors that the ANSI write() and close() functions are
undefined.

In both CW8 and CW9, these functions are declared in MSL's unistd.h,
like so:
_MSL_IMP_EXP_C int _MSL_CDECL close(int) _MSL_CANT_THROW;
_MSL_IMP_EXP_C int _MSL_CDECL write(int , const void*, __std(size_t))
_MSL_CANT_THROW;    /*- mm 000607 -*/

It took me some time to figure out why these declarations were not
being included in CW9.  I finally traced the problem to the file
<cstdio>.  In CW8, the MSL file <cstdio> includes these lines:

#if _MSL_NEEDS_EXTRAS
    #include <extras.h>
#endif

However, in CW9, this has been replaced with:

#if _MSL_NEEDS_EXTRAS && (__dest_os == __win32_os || __dest_os ==
__wince_os)
    #include <extras_stdio_win32.h>
#endif

But I wonder, why was this change made in <cstdio>?  I know that
extras.h is not supposed to be used in Mach-O, but why isn't it
included for CFM anymore?  If I include <extras.h> in my code, the
compiler errors go away and the write and close functions, and
everything else in extras, are still defined in MSL_All_Carbon_Lib.  So
why aren't they still included in the headers?

Thanks,
Dan