Wireshark-dev: Re: [Wireshark-dev] Use of MAP_ANON in epan/emem.c
From: Jaap Keuter <[email protected]>
Date: Tue, 20 Jun 2006 08:07:02 +0200 (CEST)
Hi,

I see that an OSX-10.3-PPC buildbot has appeared. Is this the *BSD
buildbot?

Thanx,
Jaap

On Sun, 18 Jun 2006, Jaap Keuter wrote:

> Hi,
>
> Oh I love those UNIX variants.... Yet another compatibility layer
> added :(
> In this respect would it be wise to have a *BSD buildbot?
>
> Thanx,
> Jaap
>
> On Fri, 16 Jun 2006, Guy Harris wrote:
>
> >
> > On Jun 16, 2006, at 6:11 PM, Guy Harris wrote:
> >
> > > The IRIX 6.5 man page for /dev/zero indicates you can mmap it to get
> > > anonymous pages.  Are there any UN*Xes we support that *don't* allow
> > > you to mmap /dev/zero to get anonymous pages?
> >
> > Yes - it appears that FreeBSD and OS X don't.
> >
> > > if so, we might want to use MAP_ANONYMOUS on systems that
> > > define it, otherwise use MAP_ANON on systems that define it (OS X
> > > 10.4 defines MAP_ANON but *NOT* MAP_ANONYMOUS, and that seems to be a
> > > general BSD characteristic - I don't find any definitions of
> > > MAP_ANONYMOUS in the sys/sys source directory of fairly recent
> > > {Free,Net,Open}BSD), otherwise use "/dev/zero".
> >
> > I've checked in a change to do that.  It allows Wireshark to build on
> > OS X (the change of MAP_ANON to MAP_ANONYMOUS probably broke
> > {Free,Open,Net,DragonFly}BSD builds as well), and it includes
> > untested code to handle systems that have neither MAP_ANONYMOUS nor
> > MAP_ANON - it assumes they have /dev/zero, opens that, and maps it.
>
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