[RFC][PATCH][BZ 15846] Add error reporting (via errno) to getauxval().

[Ondřej Bílka]

On Tue, Dec 10, 2013 at 12:35:13AM -0800, Brooks Moses wrote:
> As discussed in the recent thread on my $EXEC_ORIGIN patch and in BZ way 
> of reporting an error condition.  It currently returns zero on error, 
> but this may also be a valid result for some auxv entries.  As there is 
> no clear invalid result for all current and future auxv entries, this 
> patch sets errno (following a suggestion in the BZ entry).
> 
> This is still an RFC because I haven't yet tested it; at present it's a 
> strawman to confirm that the proposed solution has consensus approval.
> 
In implementation you need to also clear errno otherwise it could
originate from previous getaddrinfo or such.