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KADM5 hook interface (kadm5_hook)
=================================
The kadm5_hook interface allows modules to perform actions when
changes are made to the Kerberos database through :ref:`kadmin(1)`.
For a detailed description of the kadm5_hook interface, see the header
file ``<krb5/kadm5_hook_plugin.h>``.
The kadm5_hook interface has four primary methods: **chpass**,
**create**, **modify**, and **remove**. Each of these methods is
called twice when the corresponding administrative action takes place,
once before the action is committed and once afterwards. A module can
prevent the action from taking place by returning an error code during
the pre-commit stage.
A module can create and destroy per-process state objects by
implementing the **init** and **fini** methods. State objects have
the type kadm5_hook_modinfo, which is an abstract pointer type. A
module should typically cast this to an internal type for the state
object.
Because the kadm5_hook interface is tied closely to the kadmin
interface (which is explicitly unstable), it may not remain as stable
across versions as other public pluggable interfaces.
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