mmap() w/o MAP_ANON

[Ben Lindstrom]

On Thu, 11 Apr 2002, Nicolas Williams wrote:

> Er, shouldn't it be
>
> #ifdef MAP_ANON
> address = mmap(NULL, size, PROT_WRITE|PROT_READ, MAP_ANON|MAP_SHARED,
>       -1, 0);
> #else
> address = mmap(NULL, size, PROT_WRITE|PROT_READ, MAP_PRIVATE,
>       open("/dev/zero",...), 0);
> #endif
>
Yes and no..  MAP_PRIVATE must be MAP_SHARED  so all children can see
the information written.  But otherwises yes.  Since it does not have a
MAP_ANON we need to provide a FD to something.

- Ben

> ?
>
> Nico
>
> On Wed, Apr 10, 2002 at 08:41:45PM -0700, Tim Rice wrote:
> >
> > Would this work in monitor_mm.c ?
> > #ifdef MAP_ANON
> > address = mmap(NULL, size, PROT_WRITE|PROT_READ, MAP_ANON|MAP_SHARED,
> > 	-1, 0);
> > #else
> > address = mmap(NULL, size, PROT_WRITE|PROT_READ, MAP_SHARED,
> > 	-1, 0);
> > #endif
> >
> > Many systems have mmap() but no MAP_ANON/MAP_ANONYMOUS
> > Ie. SCO 5.0.x, UnixWare 2.x, Solaris < 8
> >
> > Is MAP_ANON needed or do we just #undef HAVE_MMAP on systems that
> > don't have it?
> >
> > --
> > Tim Rice				Multitalents	(707) 887-1469
> > tim at multitalents.net
> >
> >
> > _______________________________________________
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