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+.\"-
+.\" Copyright (c) 2006 Robert N. M. Watson
+.\" All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.Dd March 4, 2006
+.Dt AU_OPEN 3
+.Os
+.Sh NAME
+.Nm au_close ,
+.Nm au_close_buffer ,
+.Nm au_close_token ,
+.Nm au_open ,
+.Nm au_write
+.Nd "create and commit audit records"
+.Sh LIBRARY
+.Lb libbsm
+.Sh SYNOPSIS
+.In bsm/libbsm.h
+.Ft int
+.Fn au_open void
+.Ft int
+.Fn au_write "int d" "token_t *tok"
+.Ft int
+.Fn au_close "int d" "int keep" "short event"
+.Ft int
+.Fn au_close_buffer "int d" "short event" "u_char *buffer" "size_t *buflen"
+.Ft int
+.Fn au_close_token "token_t *tok" "u_char *buffer" "size_t *buflen"
+.Sh DESCRIPTION
+These interfaces allow applications to allocate audit records, construct a
+record using a series of tokens, and commit the audit record to the system
+event log.
+An extension API is also provided to commit the record to an in-memory
+buffer rather than the system audit log.
+.Pp
+The
+.Fn au_open
+interface allocates a new audit record descriptor.
+.Pp
+The
+.Fn au_write
+interface adds a token to an allocated audit descriptor.
+When a token has been successfully added to a record, the caller no longer
+owns the token memory, and does not need to free it directly via a call to
+.Xr au_free_token 3 .
+.Pp
+The
+.Fn au_close
+function is used to commit an audit record to the system audit log, or
+abandon the record.
+In either cases, all resources associated with the record will be released.
+The
+.Fa keep
+argument determines the behavior: a value of
+.Dv AU_TO_WRITE
+causes the record to be committed; a value of
+.Dv AU_TO_NO_WRITE
+causes it to be abandoned.
+When the audit record is committed, a BSM header will be inserted before
+tokens added to the record, using the event identifier passed via
+.Fa event ,
+and a trailer added to the end.
+Committing a record to the system audit log requires privilege.
+.Pp
+The
+.Fn au_close_buffer
+function writes the resulting record to an in-memory buffer of size
+.Fa *buflen ;
+it will write back the filled buffer length into the same variable.
+The argument
+.Fa event
+is the event identifier to use in the record header.
+.Pp
+The
+.Fn au_close_token
+function generates the BSM stream output for a single token,
+.Fa tok ,
+in the passed buffer
+.Fa buffer .
+The initial buffer size and resulting data size are passed via
+.Fa *buflen .
+The
+.Fn au_close_token
+function
+will free the token before returning.
+.Sh RETURN VALUES
+The function
+.Fn au_open
+returns a non-negative audit record descriptor number on success, or a
+negative value on failure, along with error information in
+.Va errno .
+.Pp
+The functions
+.Fn au_write ,
+.Fn au_close ,
+.Fn au_close_buffer ,
+and
+.Fn au_close_token
+return 0 on success, or a negative value on failure, along with error
+information in
+.Va errno .
+.Sh SEE ALSO
+.Xr audit_submit 3 ,
+.Xr libbsm 3
+.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
+.An -nosplit
+This software was created by
+.An Robert Watson ,
+.An Wayne Salamon ,
+and
+.An Suresh Krishnaswamy
+for McAfee Research, the security research division of McAfee,
+Inc., under contract to Apple Computer, Inc.
+.Pp
+The Basic Security Module (BSM) interface to audit records and audit event
+stream format were defined by Sun Microsystems.
+.Sh BUGS
+Currently,
+.Fn au_open
+does not reserve kernel resources necessary to commit the record to the
+trail; on systems supporting
+.Fn au_close ,
+the call will block until resources are available to commit the record.
+However, this leads to the possibility of an action being permitted without
+the record being guaranteed to go to disk.
+Ideally,
+.Fn au_open
+would reserve resources necessary to commit any submitted record, releasing
+them on
+.Fn au_close .