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From: dana <dana@dana.is>
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Subject: [QUESTION] Inheritance of file descriptors in <( ... ) construct
Message-Id: <B78C1DFA-4925-473E-9A9F-DFF3695F2EEC@dana.is>
Date: Fri, 25 May 2018 19:01:54 -0500
To: Zsh workers <zsh-workers@zsh.org>
X-Mailer: Apple Mail (2.3445.6.18)

Hello,

I'm wondering about the following behaviour:

  % ( fd=3D; exec {fd}>&2; : $( print foo >&$fd ) )
  foo
  % ( fd=3D; exec {fd}>&2; : =3D( print foo >&$fd ) )
  foo
  % ( fd=3D; exec {fd}>&2; : <( print foo >&$fd ) )
  zsh: 12: bad file descriptor

As you can see, $fd (12) was inherited by the $( ... ) and =3D( ... ) =
constructs,
but not by the <( ... ) one.

Everything works as expected with FDs < 10, though:

  % ( fd=3D9; exec 9>&2; : $( print foo >&$fd ) )
  foo
  % ( fd=3D9; exec 9>&2; : =3D( print foo >&$fd ) )
  foo
  % ( fd=3D9; exec 9>&2; : <( print foo >&$fd ) )
  foo

Is this intended and/or desirable? Maybe something to do with the fact =
that
<( ... ) is itself exposed as a >=3D10 file descriptor? But it seems =
smart enough
not to re-use the number that $fd had (it uses 13 in this example), =
so...?

Cheers

dana