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NetBSD 6.1.5 - man page for shutdownhook_establish (netbsd section 9)

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 function 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 environment in which they are run, shutdown hooks
     cannot rely on many system services (including file systems, and timeouts and other inter-
     rupt-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


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