Date: Sat, 21 Aug 1999 11:10:14 -0700 From: Jason Thorpe <thorpej@nas.nasa.gov> To: Wes Peters <wes@softweyr.com> Cc: hackers@FreeBSD.ORG Subject: Re: mmap mapped segment length Message-ID: <199908211810.LAA13809@lestat.nas.nasa.gov>
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On Sat, 21 Aug 1999 02:10:47 -0600
Wes Peters <wes@softweyr.com> wrote:
> I discovered to my dismay today that the length field in the mmap call is
> a size_t, not an off_t. I was attempting to process a large (~50 MByte) file
> and found I was only processing the first 4 MBytes of it.
...first of all, I assume you mean GByte, not MByte.
The type of the "len" argument is specified by multiple standards. You could
change size_t to a 64-bit quantity, but then you have:
(1) A serious ABI incompatibility issue with the rest of the x86
world.
(2) You'd have to go to 64-bit arithmetic everywhere in the VM code
which could seriously impact performance.
> Is this intentional, or just an artifact of the implementation? Is there any
> reason NOT to change this to an off_t?
-- Jason R. Thorpe <thorpej@nas.nasa.gov>
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