what is _XOPEN_SOURCE=500 needed for?

[Daniel Stone]

On Fri, May 27, 2005 at 11:50:47PM -0700, Josh Triplett wrote:
> The optimal solution to this problem would probably be to rewrite the
> macros in Xpoll.h to use the portable macros FD_SET, FD_CLEAR, FD_ISSET,
> and FD_ZERO.  Attempting to look at the insides of struct fd_set, and in
> particular assuming that it has a member fds_bits, is non-portable;
> defining _*_SOURCE just lets it use this non-portable behavior on some
> additional platforms.

Alan, Mathieu, Eric A, others: is this portable to your OS?
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