simple mmap() question

[Igor Tatarinov <ta...@prairie.NoDak.edu>]

Hi, I have a simple question: does
mmap(/dev/zero, RW, SHARED)
imply that any UNIX process will be able to do the same and corrupt the
contents of the resulting shared memory.

In other words, if I install and run two apaches on the same SUN box
will they screw up each others scoreboards?

thanks,
igor

Re: simple mmap() question

[Dean Gaudet <dg...@arctic.org>]

No, /dev/zero is a special case for mmap().  It is shared only via
filehandle or process memory inheritance.  But I can't find a reference in
the Single UNIX Specification which states this.

Dean

On Sat, 22 Nov 1997, Igor Tatarinov wrote:

> Hi, I have a simple question: does
> mmap(/dev/zero, RW, SHARED)
> imply that any UNIX process will be able to do the same and corrupt the
> contents of the resulting shared memory.
> 
> In other words, if I install and run two apaches on the same SUN box
> will they screw up each others scoreboards?
> 
> thanks,
> igor
>