Re: mmap alignment.

Subject: Re: mmap alignment.

From: Chris Sarcone <email@hidden>

Date: Mon, 13 Feb 2006 15:52:20 -0800

Delivered-to: email@hidden

Theo --

I'd like to mmap a 64k and have the resulting address be aligned on a 64k boundary. I'm trying with:
mmap((void *)65536, 65536, PROT_NONE, MAP_PRIVATE | MAP_ANON | MAP_NORESERVE | MAP_ALIGN, -1, 0);

Darwin does not appear to support MAP_ALIGN (A cursory glance at SUS does not reveal any requirement for it - though other OSes do support it). File an enhancement request via http://bugreporter.apple.com for this feature to be considered for a future OS release.

However, the return address is not modulo 64k. How do I accomplish what I want?

Over-allocate (128k) chunk and manually align perhaps?

-- Chris

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Follow-Ups:

Re: mmap alignment.
- From: Jim Magee <email@hidden>

References:

>mmap alignment. (From: Theo Schlossnagle <email@hidden>)