38.11 Querying Before Exit
When Emacs exits, it terminates all its subprocesses. For
subprocesses that run a program, it sends them the SIGHUP
signal; connections are simply closed. Because subprocesses may be
doing valuable work, Emacs normally asks the user to confirm that it
is ok to terminate them. Each process has a query flag, which, if
non-nil, says that Emacs should ask for confirmation before
exiting and thus killing that process. The default for the query flag
is t, meaning do query.
— Function:
process-query-on-exit-flag process
This returns the query flag of process.
— Function:
set-process-query-on-exit-flag process flag
This function sets the query flag of process to flag. It
returns flag.
Here is an example of using set-process-query-on-exit-flag on a
shell process to avoid querying:
(set-process-query-on-exit-flag (get-process "shell") nil)
⇒ nil
— User Option:
confirm-kill-processes
If this user option is set to t (the default), then Emacs asks
for confirmation before killing processes on exit. If it is
nil, Emacs kills processes without confirmation, i.e., the
query flag of all processes is ignored.