Date: Thu, 14 Sep 2000 20:47:21 -0400 (EDT) From: Zhiui Zhang <zzhang@cs.binghamton.edu> To: Mike Meyer <mwm@mired.org> Cc: questions@freebsd.org Subject: Re: write to terminal in a background process Message-ID: <Pine.SOL.4.21.0009142040540.7747-100000@opal> In-Reply-To: <14785.27988.529047.912155@guru.mired.org>
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On Thu, 14 Sep 2000, Mike Meyer wrote:
> Zhiui Zhang writes:
> > I thought a background process can not write to terminal. It will get a
> > signal if trying to do so. But someone presents me a small program:
>
> No, it *may* not be able to write to the terminal, depending on the
> terminals modes. See "man stty", particularly the "tostop" option.
>
> > #include
> > main()
> > {
> > printf("printing\n");
> > }
> >
> > $ a.out &
> >
> > and it does print. Can anyone explain this to me? Thanks.
>
> Try
> $ stty tostop
> $ a.out &
>
> and see what it does (or maybe it's "stty -tostop").
You are right! I just tested it and it worked. May I ask you another
question? If several foreground processes reading from the stdin, will
the keyboard inputs be accepted by them in a round-robin fashion? Thanks.
-Zhihui
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