.\"-
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.\" Copyright (c) 2015 Christian Brueffer
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.Dd July 29, 2015
.Dt AU_NOTIFY 3
.Os
.Sh NAME
.Nm au_get_state ,
.Nm au_notify_initialize ,
.Nm au_notify_terminate
.Nd "audit event notification"
.Sh LIBRARY
.Lb libbsm
.Sh SYNOPSIS
.In bsm/libbsm.h
.Ft int
.Fn au_get_state "void"
.Ft uint32_t
.Fn au_notify_initialize "void"
.Ft int
.Fn au_notify_terminate "void"
.Sh DESCRIPTION
The
.Nm au_notify
audit notification API tracks audit state in a form permitting efficient
update, avoiding frequent system calls to check the kernel audit state.
It is implemented only for Darwin/Mac OS X.
.Pp
The
.Fn au_get_state
function provides a lightweight way to check whether or not auditing is
enabled.
If a client wants to use this function to determine whether an entire
series of audit calls should be made -- as in the common case of a caller
building a set of tokens, then writing them -- it should cache the audit
status in a local variable.
This function always returns the current state of auditing.
If audit notification has not already been initialized by calling
.Fn au_notify_initialize
it will be automatically initialized on the first call of
this function.
.Pp
The
.Fn au_notify_initialize
function initializes audit notification.
.Pp
The
.Fn au_notify_terminate
function cancels audit notification and frees the resources associated with it.
Responsible code that no longer needs to use
.Fn au_get_state
should call this function.
.Sh RETURN VALUES
If no error occurred the
.Fn au_get_state
function returns
.Dv AUC_NOAUDIT
if auditing is disabled or suspended, and
.Dv AUC_AUDITING
if auditing is enabled and active.
Otherwise, the function can return any of the errno values defined for
.Xr setaudit 2 ,
or
.Dv AU_UNIMPL
if audit does not appear to be supported by the system.
.Pp
The
.Fn au_notify_initialize
function returns 0 on success,
.Dv AU_UNIMPL
if audit does not appear to be supported by the system,
or one of the status codes defined in
.In notify.h
on Mac OS X to indicate the error.
.Pp
The
.Fn au_notify_terminate
function returns 0 on success, or \-1 on failure.
.Sh SEE ALSO
.Xr libbsm 3 ,
.Xr notify 3 (Mac OS X)
.Sh HISTORY
The OpenBSM implementation was created by McAfee Research, the security
division of McAfee Inc., under contract to Apple Computer, Inc., in 2004.
It was subsequently adopted by the TrustedBSD Project as the foundation for
the OpenBSM distribution.
.Sh AUTHORS
This software was created by
.An Apple Computer, Inc .
.Pp
The Basic Security Module (BSM) interface to audit records and audit event
stream format were defined by Sun Microsystems.