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Re: misbehavior in shell window with ksh

From: Stephen Berman
Subject: Re: misbehavior in shell window with ksh
Date: Thu, 04 May 2017 09:54:23 +0200
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/26.0.50 (gnu/linux)

On Wed, 03 May 2017 20:51:47 +0300 Eli Zaretskii <address@hidden> wrote:

>> From: Stephen Berman <address@hidden>
>> Cc: address@hidden,  address@hidden
>> Date: Tue, 02 May 2017 18:55:01 +0200
>> #52 0x0000000000553443 in internal_condition_case_1
>> (address@hidden <read_process_output_call>, arg=50273987,
>> address@hidden, address@hidden
>> <read_process_output_error_handler>)
>>     at /home/steve/git/emacs-master/src/eval.c:1348
>> #53 0x0000000000588e2f in read_and_dispose_of_process_output
>> (address@hidden, address@hidden "> ",
>> address@hidden, address@hidden) at
>> /home/steve/git/emacs-master/src/process.c:5979
>> #54 0x0000000000589095 in read_process_output (address@hidden,
>> address@hidden) at /home/steve/git/emacs-master/src/process.c:5890
>> #55 0x0000000000590a0a in wait_reading_process_output
>> (address@hidden, address@hidden, read_kbd=<optimized
>> out>, address@hidden, address@hidden,
>> address@hidden, just_wait_proc=just---Type <return> to
>> continue, or q <return> to quit---
>> address@hidden) at /home/steve/git/emacs-master/src/process.c:5589
>> #56 0x0000000000421953 in sit_for (address@hidden,
>> address@hidden, address@hidden)
>>     at /home/steve/git/emacs-master/src/dispnew.c:5763
>> #57 0x00000000004f313e in read_char (commandflag=1, address@hidden,
>> prev_event=0, address@hidden,
>> address@hidden) at
>> /home/steve/git/emacs-master/src/keyboard.c:2722
> The above is the interesting part: it shows that the "> " string was
> received from the shell subprocess.  And that rings a bell: we have
> this window-adjust-process-window-size-function feature, which is new
> in Emacs 25.  It sends a TIOCSWINSZ or TIOCSSIZE ioctl to the shell's
> pty; perhaps that causes the shell to respond with PS2?  Can you play
> with the value of this variable, like set it to a function that
> returns nil, so that set-process-window-size is not called, and see if
> that helps to avoid the issue?

Bingo!  That variable is a user option and when I change its value with
M-x customize-option to "Do not adjust process window sizes" (i.e. the
function `ignore') and then execute the recipe, "> " is not inserted.
When I return to the customization buffer and change the value back to
the default "Minimum area of any window" (i.e. the function
`window-adjust-process-window-size-smallest') and then switch back to
the *shell* buffer, "> " I see that has now been inserted.

Steve Berman

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