[plt-scheme] Noticeable absence of (with-output-to-port ...) and (with-input-from-port ...)

Sorry I didn't say this explicitly in my earlier message, but some
uses of OS-level pipes can be done wholely within Scheme using various
port functions (like make-pipe).

Robby

On Thu, Sep 11, 2008 at 10:19 AM,  <hendrik at topoi.pooq.com> wrote:
> On Thu, Sep 11, 2008 at 09:36:30AM -0400, Ernie Smith wrote:
>> I was looking to redirect intput and output of existing
>> scheme functions to pipes.
>
> This isn't portable, but in
> http://www.informit.com/articles/article.aspx?p=99706&seqNum=15
> it says:
>
> * 3.15 /dev/fd
> *
> * Newer systems provide a directory named /dev/fd whose entries are
> * files named 0,1, 2, and so on. Opening the file /dev/fd/n is
> * equivalent to duplicating descriptor n (assuming that descriptor n is
> * open).
> *
> * The /dev/fd feature was developed by Tom Duff and appeared in the 8th
> * Edition of the Research Unix System. It is supported by SVR4 and
> * 4.3+BSD. It is not part of POSIX.1.
>
> /dev/fd/0, /dev/fd/1, etc. seem to be part of my Debian Lenny system.
>
> -- hendrik
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