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Re: [PATCH v2] [BZ #10283] localedef: align fixed maps to SHMLBA
- From: Andreas Schwab <schwab at suse dot de>
- To: "Carlos O'Donell" <carlos at redhat dot com>
- Cc: Roland McGrath <roland at hack dot frob dot com>, David Miller <davem at davemloft dot net>, vapier at gentoo dot org, libc-alpha at sourceware dot org
- Date: Wed, 29 May 2013 09:46:26 +0200
- Subject: Re: [PATCH v2] [BZ #10283] localedef: align fixed maps to SHMLBA
- References: <20130528194042 dot 1EF7B2C074 at topped-with-meat dot com> <20130528 dot 130721 dot 1721261559877509450 dot davem at davemloft dot net> <51A51186 dot 7070904 at redhat dot com> <20130528 dot 132601 dot 2200516495498570890 dot davem at davemloft dot net> <51A524FE dot 7040202 at redhat dot com> <20130528231403 dot 2C6C32C05D at topped-with-meat dot com> <51A544A5 dot 5050001 at redhat dot com>
"Carlos O'Donell" <carlos@redhat.com> writes:
> http://pubs.opengroup.org/onlinepubs/9699919799/functions/mmap.html
> ~~~
> If MAP_FIXED is specified, the implementation may
> require that addr is a multiple of the page size.
> ~~~
> Thus addr must be aligned to N*<page size>, where N is implementation
> specific.
That does not follow from here. The important bits are here:
The mmap() function may fail if:
[EINVAL]
The addr argument (if MAP_FIXED was specified) or off is not a
multiple of the page size as returned by sysconf(), or is considered
^^^^^^^^^^
invalid by the implementation.
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Andreas.
--
Andreas Schwab, SUSE Labs, schwab@suse.de
GPG Key fingerprint = 0196 BAD8 1CE9 1970 F4BE 1748 E4D4 88E3 0EEA B9D7
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