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Message-ID: <033d01c199de$4578ab10$0200a8c0@lifelesswks>
From: "Robert Collins" <robert DOT collins AT itdomain DOT com DOT au>
To: "Corinna Vinschen" <cygwin AT cygwin DOT com>
References: <200201101259 DOT g0ACxFN12728 AT dymwsm10 DOT mailwatch DOT com> <20020110144551 DOT J12057 AT cygbert DOT vinschen DOT de>
Subject: Re: ksh on cygwin
Date: Fri, 11 Jan 2002 00:54:06 +1100
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----- Original Message -----
From: "Corinna Vinschen" <cygwin AT cygwin DOT com>
> > - getpagesize() should return a value compatible with mmap(), that
is dwAllocGranularity (65536) instead of dwPageSize (1024).
>
> We discussed that months ago.  I think we're not going to change that
> (it's 4096, not 1024, btw.).  It will result in dubious problems
> when a process mmaps a file.  For instance, the latest gcc expects to
> be able to read over the end of an mmaped file if the size is not a
> multiple of getpagesize().  Now think of a file which is
coincidentally
> exactly 1 page long...

I'm not sure what you are implying. unless getpagesize returns 1, the
behaviour for gcc will be consistent for all larger sizes. If it's 4k,
then a file that is 4k will behave the same way as a 64K file if the
pagesize returned is 64k.

You seem to be implying that something bad happens when the file size ==
the returned page size.

What is that bad thing?

Rob


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