Wireshark-dev: Re: [Wireshark-dev] [Wireshark-commits] rev 51169: / /trunk/epan/: app_mem_usage
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From: Jakub Zawadzki <darkjames-ws@xxxxxxxxxxxx>
Date: Tue, 6 Aug 2013 21:01:01 +0200
On Tue, Aug 06, 2013 at 02:18:38PM -0400, Evan Huus wrote:
> Or not quite. The question is why the feature test macro is for glibc
> 2.12 and 2008, when the function existed long before that...

I've used _XOPEN_SOURCE to avoid problems :)

But most likely because it's guarder with _POSIX_C_SOURCE >= 200809L (read: POSIX-1.2008).
So we need some glibc after POSIX-1.2008 was standarized.

According to feature_test_macros _POSIX_C_SOURCE >= 200809L should work with
glibc-2.10 (released 2009-05-09), but most likely for pread() it's not :)

man page about pread() being POSIX-1.2001 is little confusing, cause 
it was XSI extension, and since Issue 7 of pread() [1] was moved to base,
and _POSIX_C_SOURCE >= 200112L don't accept XSI extensions.

[1] http://pubs.opengroup.org/onlinepubs/9699919799/functions/pread.html#tag_16_474_14