[Bug 214735] Patch to add ENODATA

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=214735

            Bug ID: 214735
           Summary: Patch to add ENODATA
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: bin
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: wjw at digiware.nl

For porting Ceph to FreeBSD I'm in dire need of ENODATA as the equivalent of
ENOATTR.
The text of the opengroup on this is included at the end, in an excerpt of
Email on hackers@

This would require the following patch.

*** /usr/include/errno.h        Mon Oct  3 02:05:43 2016
--- /usr/srcs/head/src/sys/sys/errno.h  Sun Aug 21 18:25:05 2016
***************
*** 164,170 ****
  #define       ECANCELED       85              /* Operation canceled */
  #define       EILSEQ          86              /* Illegal byte sequence */
  #define       ENOATTR         87              /* Attribute not found */
- #define       ENODATA         87              /* Attribute not found */

  #define       EDOOFUS         88              /* Programming error */
  #endif /* _POSIX_SOURCE */
--- 164,169 ----

> According the standard is ENODATA an extention of errno.h defines...
>
> http://pubs.opengroup.org/onlinepubs/9699919799/
>
> The Open Group Base Specifications Issue 7
> IEEE Std 1003.1, 2013 Edition
>
> [ENODATA]
>      [OB XSR] [Option Start]
>      No message available. No message is available on the STREAM head
> read queue. [Option End]
>
> [XSR] [Option Start] XSI STREAMS [Option End]
> The functionality described is optional. The functionality described is
> also an extension to the ISO C standard.
>
> Where applicable, functions are marked with the XSR margin legend in the
> SYNOPSIS section. Where additional semantics apply to a function, the
> material is identified by use of the XSR margin legend.
>
> [OB] [Option Start] Obsolescent [Option End]
> The functionality described may be removed in a future version of this
> volume of POSIX.1-2008. Strictly Conforming POSIX Applications and
> Strictly Conforming XSI Applications shall not use obsolescent features.
>
> Where applicable, the material is identified by use of the OB margin legend.
> ----
>
> The OB part makes a bit strange to ask for definition, but would it be
> possible to add ENODATA to our headers?
> The alternative question is: why would we not?

Well, it's defined for STREAMS and FreeBSD (and BSDs in general) don't
implement STREAMS.  OTOH, if Ceph has (ab)used it for their own internal
errors then we could perhaps add our own ENODATA.  Do you want to make a
patch to do so?

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