Date: Wed, 04 Nov 2009 12:42:25 -0600 From: Alan Cox <alc@cs.rice.edu> To: Ed Schouten <ed@80386.nl> Cc: alc@freebsd.org, freebsd-hackers@freebsd.org, Alexander Best <alexbestms@math.uni-muenster.de> Subject: Re: mmap(2) with MAP_ANON honouring offset although it shouldn't Message-ID: <4AF1CB11.2090503@cs.rice.edu> In-Reply-To: <20091104183434.GB1293@hoeg.nl> References: <permail-200910211551041e86ffa80000182a-a_best01@message-id.uni-muenster.de> <ca3526250910211051v2fef55e7yda262a58df200751@mail.gmail.com> <20091103172452.GU1293@hoeg.nl> <200911040812.18712.jhb@freebsd.org> <20091104162646.GZ1293@hoeg.nl> <4AF1C707.6000706@cs.rice.edu> <20091104183434.GB1293@hoeg.nl>
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Ed Schouten wrote: > * Alan Cox <alc@cs.rice.edu> wrote: > >> For what it's worth, I believe that Solaris does the exact opposite. >> They provide MAP_ANONYMOUS for compatibility. It seems like a good >> idea for us to do the same. >> > > Something like this? > > Index: mman.h > =================================================================== > --- mman.h (revision 198919) > +++ mman.h (working copy) > @@ -82,6 +82,9 @@ > */ > #define MAP_FILE 0x0000 /* map from file (default) */ > #define MAP_ANON 0x1000 /* allocated from memory, swap space */ > +#ifndef _KERNEL > +#define MAP_ANONYMOUS MAP_ANON /* For compatibility. */ > +#endif /* !_KERNEL */ > > /* > * Extended flags > > Yes. If no one objects in the next day or so, then please commit this change. Alan
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