> Here is a much more precise answer to the question. Thanks to Nick Carbone
> in the C group for the response.
> z/OS is sitting at the XPG 4.2 branding level achieved back in MVS 5.2.2.
> You mention UNIX 95. I suppose that could be considered equiavalent to XPG
> 4.2. Since then, we have implemented some UNIX 98 (XPG Issue 5), some C99
> (ISO/IEC 9899:1999), and some UNIX 03 (XPG Issue 6) functions over the
> years. We are designed for full support of C99 in R7. We are neither UNIX
> 98 nor UNIX 03 compliant at this time.
>
> The pertinent feature test macros added since XPG 4.2 are:
>
> _XOPEN_SOURCE 500 exposes some UNIX 98 (automatically turns on the
> other feature test macros to bring in XPG 4.2 interfaces)
> _ISOC99_SOURCE exposes some C99 (does not automatically turn on
> any other feature test macro)
> _UNIX03_SOURCE exposes some UNIX 03 (which includes IEEE POSIX
> 1003.1:2001) (does not turn on any other feature test macro)
>
> The C/C++ Run-Time Library Reference should indicate the level of
standards
> implemented. If information there is unclear, incorrect, or otherwise
> insufficient, this person can contact me directly and I will take care of
> the issues.
Dear Don Ault，
Thank you very very much for your wonderful reply!!!
I care about the shell and utilities difference between Unix95 and Unix03
for zOS Unix. I've gone through Unix95 and Unix03 shell and utilities
standard publication and my question is:* Is there any detailed documents
about "what's new/difference" about a shell or utility (eg. sed)?* I mean
the shell and utility description of Unix03/Unix95 standard publication is
too long (more than 30 pages) and the change history is too short (less than
10 lines). I just want to know the detailed difference between different
Unix standards about a shell and utility. Any suggestions are welcome and
appreciated!
Thank you!
Best Regards,
Xie Bo
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