cederom commented on PR #18116:
URL: https://github.com/apache/nuttx/pull/18116#issuecomment-3786330236
> @cederom do you know if FreeBSD also do like Linux in this case?
This looks bad idea to use Ctrl+C to kill background jobs, because you can
kill many jobs that way accidentally? Ctrl+C generates a signal that is handled
by _current_ application only.
Foreground, Ctrl+C kills the top.
```
% top <-- Ctrl+C exits top
%
```
When in the background Ctrl+C does not kill process.. and it should not
because why.. Ctrl+C signal is directed to the current process that is shell
right? You need to `fg` and then Ctrl+C sends the signal to the current process
in the foreground:
Tested in `zsh` (note I have two top already running as tmux plugins):
```
hexagon% ps | grep top
4685 4 TN 0:00,00 top
5885 4 TN 0:00,00 top
10997 4 SN+ 0:00,00 grep top
hexagon% top
<-- Ctrl+Z
zsh: suspended top
hexagon% <-- Ctrl+C does nothing.
hexagon% ps | grep top
4685 4 TN 0:00,00 top
5885 4 TN 0:00,00 top
11197 4 TN 0:00,01 top
11606 4 SN+ 0:00,00 grep top
hexagon% fg
[3] continued top <-- Ctrl+C kills top.
hexagon% ps | grep top
4685 4 TN 0:00,00 top
5885 4 TN 0:00,00 top
```
The same in `bash`:
```
[cederom@hexagon ~]$ ps | grep top
4685 4 TN 0:00,00 top
5885 4 TN 0:00,00 top
25260 4 RN+ 0:00,00 grep top
[cederom@hexagon ~]$ top <-- Ctrl+C exits top.
[cederom@hexagon ~]$ ps | grep top
4685 4 TN 0:00,00 top
5885 4 TN 0:00,00 top
25529 4 SN+ 0:00,00 grep top
[cederom@hexagon ~]$ top <-- Ctrl+Z brings top to back.
[1]+ Stopped top
[cederom@hexagon ~]$ ps | grep top
4685 4 TN 0:00,00 top
5885 4 TN 0:00,00 top
25716 4 TN 0:00,00 top <-- here it is.
[cederom@hexagon ~]$ ^C <-- Ctrl+C does nothing here.
[cederom@hexagon ~]$ ps | grep top
4685 4 TN 0:00,00 top
5885 4 TN 0:00,00 top
25716 4 TN 0:00,00 top <-- top still here.
[cederom@hexagon ~]$ fg <-- bring top to foreground.
top <-- Ctrl+X kills top.
[cederom@hexagon ~]$ ps | grep top
4685 4 TN 0:00,00 top
5885 4 TN 0:00,00 top
26616 4 SN+ 0:00,00 grep top
```
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