Le Jeudi 30 Juin 2005 00:42, Bruce Korb a écrit :
> Michael Vergoz wrote:
> > Bruce,
> >
> > <snip>
> > ret = size; // ret = 0x2001
> > if((ret%_apr_mem_page_size) != 0) { // 0x0001
> > ret -= (ret%_apr_mem_page_size); // ret -= 0x0001 =
> > 0x2000 ret += _apr_mem_page_size*map->pager; // ret += 0x1000*PAGER }
> > // ret = 0x3000 :P
> > </snip>
> >
> > When you try to sync a file into memory (file to memory) apr_mem_map()
> > will also do a "pager" auto update...
>
> Hi Mike,
>
> You cannot extend mmapped files. The trailing page is just there to avoid
> a seg fault. :) - Bruce
Heh :)
Yes you can :P
You must unmap the current map, write padding, close descriptor, open file and
remap it. That the way with MAP_SHARED !!! (that also the way for
apr_mmap_create() because it specify map_shared only.) (that what my shm
implementation do).
With MAP_PRIVATE you don't have to write padding and close/open descriptor.
Michael
