[LC++]Best way to get sigaction header code included?

[Dr Mark H Phillips]

Hi Torsten,

Thanks again for your help!

On Tue, 2003-02-18 at 20:22, Torsten Rennett wrote:
>
> read about "Feature Test Macros", e.g. in the libc-Info
> (Node: Introduction -> Using the Library -> Feature Test Macros).
> IIRC you have to set '-D_POSIX_SOURCE=1' or '-D_POSIX_C_SOURCE=199506L'.
> 
> '__USE_POSIX' and '__EXTENSIONS__' are internally used macros, note the
> double underscore!  (You've got it from a lookup in the header files,
> right?)  Do not use that, it's far from portable. 

Thanks for this advice.  The info reference was very useful.  In the end
I found that putting:

#ifdef LINUX
#undef  _GNU_SOURCE
#define _GNU_SOURCE
#endif
#ifdef SUNOS
#undef  _XOPEN_SOURCE
#define _XOPEN_SOURCE 500
#endif

seemed to be the best solution.  These automatically set
POSIX_C_SOURCE=199506L as well as a few other settings.

Cheers,

Mark.

-- 
Dr Mark H Phillips
Research Analyst (Mathematician)

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