04-06-2011
If you package up an installer (PKG file) with the script, the loginwindow.plist file enabling the logout hook you can install it and then on shutdown the script will run.
The script I posted should probably be modified to also delete the loginwindow settings for the logout hook and the script itself.
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LEARN ABOUT NETBSD
shutdownhook_establish
SHUTDOWNHOOK_ESTABLISH(9) BSD Kernel Developer's Manual SHUTDOWNHOOK_ESTABLISH(9)
NAME
shutdownhook_establish, shutdownhook_disestablish -- add or remove a shutdown hook
SYNOPSIS
void *
shutdownhook_establish(void (*fn)(void *), void *arg);
void
shutdownhook_disestablish(void *cookie);
DESCRIPTION
The shutdownhook_establish API is deprecated.
The shutdownhook_establish() function adds fn to the list of hooks invoked by doshutdownhooks(9) at shutdown. When invoked, the hook func-
tion fn will be passed arg as its only argument.
The shutdownhook_disestablish() function removes the hook described by the opaque pointer cookie from the list of hooks to be invoked at
shutdown. If cookie is invalid, the result of shutdownhook_disestablish() is undefined.
Shutdown hooks should be used to perform one-time activities that must happen immediately before the kernel exits. Because of the environ-
ment in which they are run, shutdown hooks cannot rely on many system services (including file systems, and timeouts and other interrupt-
driven services), or even basic system integrity (because the system could be rebooting after a crash).
RETURN VALUES
If successful, shutdownhook_establish() returns an opaque pointer describing the newly-established shutdown hook. Otherwise, it returns
NULL.
EXAMPLES
It may be appropriate to use a shutdown hook to disable a device that does direct memory access, so that the device will not try to access
memory while the system is rebooting.
It may be appropriate to use a shutdown hook to inform watchdog timer hardware that the operating system is no longer running.
SEE ALSO
doshutdownhooks(9)
BUGS
The names are clumsy, at best.
BSD
May 14, 2009 BSD