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Date: Tue, 26 Jun 2001 22:40:32 -0700 (PDT)
Message-Id: <20010626.224032.52840623.Takaaki.Ota@am.sony.com>
To: cygwin AT cygwin DOT com
Subject: Re: pthreads works, sorta
From: Tak Ota <Takaaki DOT Ota AT am DOT sony DOT com>
In-Reply-To: <20010627012932.I19058@redhat.com>
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	<20010627012932 DOT I19058 AT redhat DOT com>
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How about using IsBadReadPtr in addition to IsBadWritePtr?

-Tak

On Wed, 27 Jun 2001 01:29:32 -0400, Christopher Faylor <cgf AT redhat DOT com> wrote:

> On Wed, Jun 27, 2001 at 01:10:35PM +1000, Robert Collins wrote:
> >> -----Original Message-----
> >> From: Greg Smith [mailto:gsmith AT nc DOT rr DOT com]
> > 
> >> 
> >> More experimenting with my home computer, dual pIII 850:
> >> 
> >> 1. 117  157 328
> >> 2. 822 1527 ---
> >> 3. 194  240 453
> >> 4. 169  181 516
> >> 
> >As usual, I write a missive, then solve the puzzle.
> >
> >try this:
> >
> >
> >int __stdcall
> >check_valid_pointer (void *pointer)
> >{
> >  if (!pointer || IsBadWritePtr(pointer, sizeof (verifyable_object)))
> >    return EFAULT;
> >  return 0;
> >}
> 
> This is not quite the same thing as VirtualQuery.  This verifies that the
> process can write to memory.  It doesn't verify that it is accessible.
> 
> Maybe that is not important but I would have to think about this.
> 
> Nice find, though, Rob.
> 
> cgf
> 
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