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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: gdb mode with gdb command from the docker
Date: Wed, 21 Oct 2020 19:10:57 +0300
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In-Reply-To: <m2lfg0zn8w.fsf@gmail.com> (message from William Xu on Tue, 20
 Oct 2020 21:54:55 +0200)
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> From: William Xu <william.xwl@gmail.com>
> Date: Tue, 20 Oct 2020 21:54:55 +0200
> 
> I manage to make it work by disabling the gdb "-inferior-tty-set"
> command in gdb-inferior-io--init-proc.
> 
> It seems that the problem is that, process.c::allocate_pty allocates a
> pseudo-terminal for the *host*, I can find the same tty name in /dev on
> the host. It then confuses the gdb command from the docker container.
> 
> Is there any reason to call "-inferior-tty-set" commands here? Can we
> simply remove it? 

No, this setting is needed to separate the I/O device of the process
being debugged from that of GDB, so that we could redirect I/O of the
debuggee to a dedicated buffer used by "M-x gdb" to show interaction
with the program.