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Re: bash sets O_NONBLOCK on pts

From: Stephane Chazelas
Subject: Re: bash sets O_NONBLOCK on pts
Date: Wed, 2 Oct 2019 16:38:26 +0100
User-agent: NeoMutt/20171215

2019-10-02 14:27:48 +0200, Matteo Croce:
> Sometimes bash leaves the pts with O_NONBLOCK set, and all programs
> reading from stdin will get an EAGAIN:

Can you reproduce it with

   bash --norc

Or with:

   INPUTRC=/dev/null bash --norc


If you could reproduce it with:

   strace -o strace.log bash --norc

that would allow us to see where a O_NONBLOCK flag is set and
not reset.

BTW, what's the point of the check_dev_tty() function? It seems
it just attempts to open the tty (the controlling one or the one
open on stdin), closes it, but doesn't return anything about the
success of failure in doing so.

On my system (Debian amd64, 5.0.3(1)-release, bash started from
a regular terminal emulator), it's the only place where I see
O_NONBLOCK being used (and that's on a new fd that is closed
straight after, so it could not have any bearing on the OP's


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