Lately Bruce Evans wrote:

> This change makes such opens bogusly time out after 1 second (unless
> there is already a writer).
> 
> There seems to be a race in fifo_open(): opens for read don't
> terminate the wait if the reader goes away before the opener looks.
> It is not clear if sendmail is affected by this race or one of its
> own.
> 
> Untested fix for this and rev.1.79, and for a similar race in blocking
> opens of named pipes for reading:

fixes issues with apsfilter manual duplexing for me. could somebody
please commit this patch?

cheers
  simon

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