Re: [Qemu-devel] [5778] Use MAP_ANON also for FreeBSD (Juergen Lock)

[Christoph Hellwig]

On Sun, Nov 23, 2008 at 10:03:10AM +0000, Jamie Lokier wrote:
> Blue Swirl wrote:
> > -#ifdef __OpenBSD__ /* no need (?) for a dummy file on OpenBSD */
> > +/* no need (?) for a dummy file on OpenBSD/FreeBSD */
> > +#if defined(__OpenBSD__) || defined(__FreeBSD__)
> >      int map_anon = MAP_ANON;
> >  #else
> >      int map_anon = 0;
> 
> How about, simply:
> 
> #ifdef MAP_ANON
> 
> (Btw, on some OSes it has the name MAP_ANONYMOUS, so in my own
> portable code I look for both.)

I'm pretty sure there are OSes around that have MAP_ANON/MAP_ANONYMOUS
but don't support it in combination with MAP_SHARED.