Messages in this thread |  | | Date | Sat, 17 Nov 2001 16:38:56 -0200 (BRST) | From | Rik van Riel <> | Subject | Re: mmap not working? |
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On Sat, 17 Nov 2001, Rogier Wolff wrote:
> The SGI manpage says: > > All implementations interpret an addr value of > zero as granting the system complete freedom in selecting pa, subject to > constraints described below. A non-zero value of addr is taken to be a > suggestion of a process address near which the mapping should be placed. ^^^^^^^^^^
The key word here is "suggestion". There is absolutely no requirement that the OS actually uses this address.
> which hints at a possible non-alignment. It also mentions that > "offset" should be page-aligned, which I disagree with here: > everything has been set up to "do the right thing" when the mapping is > possible with an unaligned offset.
I don't know what MMU your machine has, but on most (if not all) machines an mmap() is only possible when it's page-aligned.
regards,
Rik -- Shortwave goes a long way: irc.starchat.net #swl
http://www.surriel.com/ http://distro.conectiva.com/
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