Re: Fwd: read -t 0 fails to detect input.

From	Martin Schulte <gnu@schrader-schulte.de>
Newsgroups	gnu.bash.bug
Subject	Re: Fwd: read -t 0 fails to detect input.
Date	2019-12-20 08:57 +0100
Message-ID	<mailman.1176.1576828683.1979.bug-bash@gnu.org> (permalink)
References	<CAFra36gNku2DTCyivz+caMGnTf7GvGJUTiWicUnBZatcckXGcQ@mail.gmail.com> <7e6fccb4-e5b5-eb2b-8b12-eeee9d638ae1@case.edu> <CAFra36iJqGfocqtVYqcdfkePJZ5xrWg8=pfKZXymD34Gaz02rA@mail.gmail.com> <CAFra36iUQqc-yUmZyu-3ty15jWiN=5o_XQ8pxLsZieEZP8=Lsw@mail.gmail.com> <20191220085747.1401a8011f54209747d32617@schrader-schulte.de>

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Hello!

> Could you please comment about this assertions:
> 
>  1.-   bash will either do a select() or an ioctl(FIONREAD), or neither
> of them, but not both, as it should for it to work. read -t0 is broken.
>  2.- Conclusion: read -t0 is *broken* in bash. Don't use it. –

No. It works as intended. It's not usable in a pipe in the way you try,
but this is caused by the principles of a pipe, not by a bug in read.

while ! read -t 0; do
  echo 'It works as intended - just press RETURN to see why'
done

Best regards,

Martin

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Re: Fwd: read -t 0 fails to detect input. Martin Schulte <gnu@schrader-schulte.de> - 2019-12-20 08:57 +0100

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