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Re: Upcoming /bin/sh (mostly internal) change

    Date:        Fri, 17 Mar 2017 00:42:44 +0000 (UTC)
    From: (Michael van Elst)
    Message-ID:  <oafbe3$1bf$>

  | That's two isatty() calls (== ioctl TIOCGETA) per arith expression.

Ah, that explains it.    Bizarre.   In sh $(( )) parsing, the entire
input is in an in-memory string, there are no files involved,
no fd's, and no I/O - and no rational reason at all for ever touching
any fd.

  | If I look at flex sources, it's difficult to avoid,

We will avoid it (in sh) by just not using lex (of any parentage) any more.
Problem gone.



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