bug#17361: Tramp does not save history across sessions.

[Stefan Kangas]

Michael Albinus <michael.albinus@gmx.de> writes:

> Le Wang <l26wang@gmail.com> writes:
>
>> Tramp installs its own sentinel -- tramp-process-sentinel -- over
>> shell-mode's shell-write-history-on-exit.  What's the way to write to
>> history file when the process ends without using defadvice?
>>
>> Could the default behave better?
>
> The problem seems to be more general. Emacs does not support to have
> several process sentinels for a given process. If several sentinels are
> declared for a process by ?`set-process-sentinel', they compete for
> being attached to the process. And the last one wins.
>
> So we need to support several sentinels per process. Maybe this exist
> already, but I'm not aware of such a mechanism.

(That was 7.5 years ago.)

What followed was a discussion about how Tramp should use 'add-function'
instead of 'set-process-sentinel', IIUC.  Is this still an issue, or has
the situation changed since?