[gdb/tui] Fix shell command terminal settings

In bash I have the following terminal settings:
...
$ stty
speed 38400 baud; line = 0;
-brkint -imaxbel iutf8
...
and then in gdb using the shell command likewise:
...
(gdb) shell stty
speed 38400 baud; line = 0;
-brkint -imaxbel iutf8
(gdb)
...
and likewise using a shell session:
...
(gdb) shell
$ stty
speed 38400 baud; line = 0;
-brkint -imaxbel iutf8
$
...

But in TUI, we get different settings (removed runaway indentation for
readability):
...
(gdb) shell sttyspeed 38400 baud; line = 0;
min = 1; time = 0;
-brkint -icrnl -imaxbel iutf8
-onlcr
-icanon -echo

(gdb)
...
and consequently the shell is not really usable.  This is PR tui/18215.

The easiest way to fix this is to just temporarily leave TUI while in the shell,
leaving the output of the commands in CLI mode, but that's a bit confusing.

Fix this (as suggested in the PR) by restoring the initial terminal settings
while in the shell command, such that also in TUI we have:
...
(gdb) shell sttyspeed 38400 baud; line = 0;
-brkint -imaxbel iutf8

(gdb)
...

Tested on x86_64-linux.

Reported-By: Doug Evans <dje@google.com>
Approved-By: Tom Tromey <tom@tromey.com>

Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=18215

0 files changed, 0 insertions, 0 deletions