Re: What's wrong on this mmap() ?

Hi, On Fri, Sep 23, 2011 at 1:50 PM, Andrea Gasparini <gaspa@yattaweb.it> wrote:

Hi, I'm having some problem understanding how mmap really works.

I have a (dummy) driver that allocate some memory (4k), and gives it to a userspace through mmap() - the usual remap_pfn_pages found in every example.

The userspace can read the memory correctly, but can't write to it. (though it maps with PROT_WRITE) As the manpage says: PROT_WRITE - Pages may be written.

Aerhm. If opened with O_RDRW and mapped with MAP_SHARED it works as expected :) Sorry for the silly question. Bye! -- - Andrea Gasparini - ----------------------------------------------- -------- https://launchpad.net/~gaspa --------- ----- HomePage: http://gaspa.yattaweb.it ------