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+.\"	$NetBSD: callback.9,v 1.5 2010/12/02 12:54:13 wiz Exp $
+.\"
+.\" Copyright (c) 2009 The NetBSD Foundation, Inc.
+.\" 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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 October 28, 2009
+.Dt CALLBACK 9
+.Os
+.Sh NAME
+.Nm callback
+.Nd generic callback interface
+.Sh SYNOPSIS
+.In sys/callback.h
+.Ft void
+.Fn callback_head_init "struct callback_head *ch" "int ipl"
+.Ft void
+.Fn callback_head_destroy "struct callback_head *ch"
+.Ft void
+.Fn callback_register \
+"struct callback_head *ch" "struct callback_entry *ce" "void *obj" \
+"int (*fn)(struct callback_entry *, void *, void *)"
+.Ft void
+.Fn callback_unregister "struct callback_head *ch" "struct callback_entry *ce"
+.Ft int
+.Fn callback_run_roundrobin "struct callback_head *ch" "void *arg"
+.Sh DESCRIPTION
+The generic
+.Nm callback
+interface allows lower-level layer code to execute a registered function,
+or set of functions, from the higher-level layer.
+.Pp
+Registered functions must return one of these constants:
+.Bl -tag -width Dv
+.It Dv CALLBACK_CHAIN_CONTINUE
+Indicates that the function call was successful.
+The following functions in the chain will be called.
+.It Dv CALLBACK_CHAIN_ABORT
+Indicates a failure case in the function call.
+Any following functions in the chain will not be executed.
+.El
+.Sh FUNCTIONS
+The callback structure
+.Vt callback_head
+should be initialized and destroyed using the functions described below.
+This structure contains the list of callback entries and other internal data.
+.Pp
+The
+.Vt callback_entry
+structure is an entry, normally associated with the higher-level object.
+It contains the internal data of the callback interface.
+.Bl -tag -width compact
+.It Fn callback_head_init "ch" "ipl"
+Initialize the callback structure specified by
+.Fa ch .
+The highest IPL at which this callback can be used is specified by
+.Fa ipl .
+.It Fn callback_head_destroy "ch"
+Destroy the callback structure specified by
+.Fa ch .
+The caller must unregister all functions before destroying the callback structure.
+.It Fn callback_register "ch" "ce" "obj" "fn"
+Register the callback function in the callback structure specified by
+.Fa ch .
+.Fa ce
+should point to the entry structure of the callback object.
+The callback object itself is specified by
+.Fa obj .
+The function pointer is specified by
+.Fa fn .
+.It Fn callback_unregister "ch" "ce"
+Unregister the callback function from the structure specified by
+.Fa ch .
+The entry should be passed as
+.Fa ce .
+This function may block.
+.It Fn callback_run_roundrobin "ch" "arg"
+Executes all functions registered in the callback
+structure, specified by
+.Fa ch .
+The functions are executed in round-robin fashion.
+The value of
+.Fa arg
+will be passed to the callback functions.
+.El
+.Sh CODE REFERENCES
+The
+.Nm
+interface is implemented within the file
+.Pa sys/kern/subr_callback.c .
+.Sh SEE ALSO
+.Xr intro 9