The function quit exits LispWorks unless the user cancels the operation.
There are two stages which may allow the user the chance to cancel.
"Confirm when quitting image" are run. If any action item returns nil, then LispWorks does not exit. nil) then a question like
"Do you really want to exit LispWorks?"
is presented to the user. If the answer No is supplied, then LispWorks does not exit. Otherwise, the action items of the action list "When quitting image" are run, and then LispWorks exits, and the value status is returned to the Operating System as the exit value of the LispWorks process. The default value of status is 0.
If ignore-errors-p is true, then any error signaled during the running of the action list items or the confirm prompt is ignored and quit proceeds to exit the image. If ignore-errors-p is nil and an error is signaled during the running of the action list items, then a restart is available allowing the user to choose to continue to exit the image. The default values of ignore-errors-p is nil.
If return is true and LispWorks is going to exit, then quit returns t. This can be used if you want some other Lisp process to kill the current one later, rather than it self-destructing immediately. This can be useful to allow more precise control over process termination. If return is nil then quit does not return. The default value of return is nil.
On Cocoa, when you define your own application menu (by passing :application-menu when making the application interface), the
Quit
menu item needs to call capi:destroy on the application interface, rather than quit. See capi:cocoa-default-application-interface in the
CAPI User Guide and Reference Manual
for more information.
LispWorks User Guide and Reference Manual - 20 Sep 2017