problem with readonly pinfo?

Matt Hargett
Thu Sep 18 18:09:00 GMT 2003

> On Wed, Sep 17, 2003 at 08:23:42PM +0200, Corinna Vinschen wrote:
> >On Wed, Sep 17, 2003 at 02:10:27PM -0400, Christopher Faylor wrote:
> >> On Wed, Sep 17, 2003 at 12:40:46PM -0400, Pierre A. Humblet wrote:
> >> >I was thinking about one event in catchem (sigproc) and the same kind
> >> >processing as what is done today. Don't know how compatible that is
> >> >your new implementation.
> >>
> >> That would be perfect for the old method.  I'm just blocking on a pipe
> >> If MSFT actually implemented overlapped reads for pipes this wouldn't
> >> an issue.  I don't know why they limited things in this fashion.
> >
> >Weird enough, they implemented overlapped IO for named pipes.  Just for
> >anonymous pipes (and therefore not on 9x/Me) it's not implemented.
> Yeah.  Have you ever tested overlapped I/O on regular pipes on NT?  I
> I have but I don't remember the results.  I've suspected that anonymous
> are just named pipes under the hood.

You are correct, if my memory serves me correctly. They're both implemented
in NPFS.SYS (named pipe file system). Filemon from can
monitor read/writes to named pipes, which is useful for debugging these

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