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Date: Fri, 16 Mar 2012 01:19:18 -0700
From: Paul Eggert <eggert@cs.ucla.edu>
Organization: UCLA Computer Science Department
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To: "H.J. Lu" <hjl.tools@gmail.com>
CC: LKML <linux-kernel@vger.kernel.org>, "H. Peter Anvin" <hpa@zytor.com>,
        GNU C Library <libc-alpha@sourceware.org>
Subject: x32 and width of blksize_t, suseconds_t
References: <20120315192515.GA6585@intel.com> <20120315195000.7E3BE2C0A3@topped-with-meat.com> <CAMe9rOpXRcO6a4cFEU=s1Gjzzt87zvyzuLhAWupc2pOX6az6ig@mail.gmail.com> <4F625570.7050003@cs.ucla.edu> <CAMe9rOpvnhPmpmsLedmOjjYB9SghZiov-cOUi+wrYvKaP+c9pQ@mail.gmail.com> <4F6267B1.3090805@cs.ucla.edu> <CAMe9rOrRdj_ns=rkonB2BwgmZa3KHBHTQQCv0bkH8PQ2UMXtHw@mail.gmail.com> <4F62F152.1040909@cs.ucla.edu>
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Come to think of it, the proposed x32 patch may have issues
with blksize_t and suseconds_t as well.  POSIX says that an x32
implementation must support at least one programming environment
(presumably settable via a feature test macro) where blksize_t
and suseconds_t are no wider than 'long'; see
<http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/sys_types.h.html>.
But if I understand things correctly, x32 glibc would
define these to be 'long long'.  This issue affects system
calls such as 'stat' and 'select'.