DOSHUTDOWNHOOKS(9) BSD Kernel Developer's Manual DOSHUTDOWNHOOKS(9)NAME
doshutdownhooks -- run all shutdown hooks
The doshutdownhooks routine is deprecated. Use pmf_system_shutdown(9) instead.
The doshutdownhooks() function invokes all shutdown hooks established using the shutdownhook_establish(9) function. Shutdown hooks are
called in reverse order, i.e., the shutdown hook established last will be called first.
This function is called from cpu_reboot() with interrupts turned off. It is called immediately before the system is halted or rebooted,
after file systems have been unmounted, after the clock has been updated, and after a system dump has been done (if necessary).
SEE ALSO cpu_reboot(9), shutdownhook_establish(9)BSD February 11, 2010 BSD
Check Out this Related Man Page
SHUTDOWNHOOK_ESTABLISH(9) BSD Kernel Developer's Manual SHUTDOWNHOOK_ESTABLISH(9)NAME
shutdownhook_establish, shutdownhook_disestablish -- add or remove a shutdown hook
shutdownhook_establish(void (*fn)(void *), void *arg);
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).
If successful, shutdownhook_establish() returns an opaque pointer describing the newly-established shutdown hook. Otherwise, it returns
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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