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[Chicken-users] Fw: Re: Reading from STDIN with the hang
From: |
Alexej Magura |
Subject: |
[Chicken-users] Fw: Re: Reading from STDIN with the hang |
Date: |
Sun, 6 Apr 2014 11:57:16 -0600 |
At the present, my current plan is to try rolling my own (read-char) in C,
since the one that comes with Chicken Scheme hangs until it sees a carriage
return. I’m surprised, however, that we don’t already have constructs or
what-have-you in place to allow for buffered IO. Is this implemented by-design
or just a coincidence, or is it (as I fear) part of the Scheme standard, since
Guile Scheme exhibits the same before?
--
Alexej Magura
Sent with Airmail
On April 1, 2014 at 8:56:17 AM, Alexej Magura (address@hidden) wrote:
> Compiled. Oh, and even if was interpreted, I have my shebang set to
> #!/usr/bin/env csi
> -qn.
> --
> Alexej Magura
> Sent with Airmail
>
> On April 1, 2014 at 2:17:37 AM, Christian Kellermann (address@hidden) wrote:
>
> Hi Alexej,
>
> * Alexej Magura [140331 23:24]:
> > K, so I???m currently working on an application that, if the user doesn???t
> > provide
> any options/operands, reads from STDIN, like GNU cat. I just finished adding
> signal-handling
> for SIGINT (Ctrl-c), however, now whenever I press Ctrl-c nothing happens
> because (read-char)
> hangs until I press enter. Is there a way to use (read-char) that won???t
> make it hang?
> Maybe something like: (if (not-null? (peek-char)) (read-char))? I saw that
> (char-ready?)
> is supposed to prevent the next call to (read-char) from hanging, but (while
> I???m sure
> that (char-ready?) in fact works) I can???t seem to get it to work.
> >
> > Anyone have any experience with this kind of issue; would using (read-line)
> > instead
> of (read-char) make a positive difference? (I doubt it would)
>
> Is this compiled code or interpreted code? If it is run in the
> interpreter it might be that some module you load snatches sigint
> from you. Parley is one of the candidates and maybe I should change
> that behaviour. You can instantly try this by running your csi with
> the (-n) switch which will prevent loading anything from .csirc.
>
> Kind regards,
>
> Christian
>
> --
> May you be peaceful, may you live in safety, may you be free from
> suffering, and may you live with ease.
>
- [Chicken-users] Fw: Re: Reading from STDIN with the hang,
Alexej Magura <=