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Re: System shutdown messages

On 09/05/2016 14:35, Ken Brown wrote:
A Cygwin emacs user has asked
( whether emacs can
auto-save files when he shuts down Windows from the Start Menu.  Is
there a way for a Cygwin process to listen for Windows system shutdown

This seems entirely possible using the Win32 API.

For emacs-w32, it's probably straightforward to handle WM_ENDSESSION in the message loop similarly to WM_CLOSE

(Note that the process will be terminated if you return from processing a WM_ENDSESSION message)

For emacs-nox and emacs-x11 it's more complex, as you'd have to create your own hidden window to receive the WM_ENDSESSION, and either select() on a /dev/windows fd or block in GetMessage() on a separate thread.

(see [1] for an example of the latter approach as used in the X server)

But I'm not sure that's the best approach, or if wouldn't be more appropriate to arrange for SIGTERM to be sent to emacs (or whatever) by mintty or the X server when an WM_ENDSESSION is received...


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