Re: hurd translator
On Fri, Dec 07, 2001 at 03:26:04PM +0100, Neal H Walfield wrote:
> > This is not something that can be done this way in Unix, so a program would
> > not expect it to work the way it is written above, so in the Unix world this
> > is not a useful feature to have.
>
> Try this:
>
> neal@bassanio:~ (0)$ mkfifo foo
I realize that a fifo is what you would use under Unix. But even with a
fifo you don't expect that what you write is different from what you read,
so there is little point in trying what I wrote in my mail, a write on a file
descriptor followed by a read on the very same descriptor. Consequently,
fifos and pipes are used to carry data from one program to another.
In some sense, the run translator is acting as a bidirectional pipe to a
program on the other end, so it encapsulates the complexity of creating
pipes, forking, dup'ing the file descriptors and execing the backend.
However, bidirectional pipes are non-standard, so you can't really use them
in portable software.
Marcus
--
`Rhubarb is no Egyptian god.' Debian http://www.debian.org brinkmd@debian.org
Marcus Brinkmann GNU http://www.gnu.org marcus@gnu.org
Marcus.Brinkmann@ruhr-uni-bochum.de
http://www.marcus-brinkmann.de
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