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Subject: RE: pthreads works, sorta
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Date: Wed, 27 Jun 2001 15:33:27 +1000
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Thread-Topic: pthreads works, sorta
Thread-Index: AcD+ymCmIReYs/HXQvST/Nyrk3jZBQAADCOw
From: "Robert Collins" <robert DOT collins AT itdomain DOT com DOT au>
To: "Tak Ota" <Takaaki DOT Ota AT am DOT sony DOT com>, <cygwin AT cygwin DOT com>
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I'm not sure you can get write but not read memory in win32. Can you? If
you can, then yes checking both should be done.

Rob
 

> -----Original Message-----
> From: Tak Ota [mailto:Takaaki DOT Ota AT am DOT sony DOT com]
> Sent: Wednesday, June 27, 2001 3:41 PM
> To: cygwin AT cygwin DOT com
> Subject: Re: pthreads works, sorta
> 
> 
> 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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