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Date: Thu, 29 Jul 2010 09:38:59 -0700
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From: Garrett Cooper <yanegomi@gmail.com>
To: Garrett Wollman <wollman@csail.mit.edu>
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Cc: alc@freebsd.org, standards@freebsd.org
Subject: Re: POSIX compliance issue with mmap(2)
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On Thu, Jul 29, 2010 at 8:20 AM, Garrett Wollman <wollman@csail.mit.edu> wr=
ote:
> <<On Wed, 28 Jul 2010 23:47:03 -0700, Garrett Cooper <yanegomi@gmail.com>=
 said:
>
>> =A0 =A0 According to the page noted below [1], mmap(2) should fail if th=
e
>> value isn't page-aligned:
>
>> [EINVAL]
>> =A0 =A0 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.
>
> This may be a bug in the standard (since this is a "shall fail"
> condition, and there's no reason it has to fail if the application
> didn't specify MAP_FIXED).

There are a number of opengroup manpages I've seen use the `shall
fail' tort in the ERRORs sections -- some being connect(2), open(2),
etc. I'll see if I can get clarification on whether or not there is
any wiggle room if it states "shall fail if".

Thanks,
-Garrett