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+.\"
+.\" Copyright (C) 2008 Attilio Rao <attilio@FreeBSD.org>
+.\" 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(s), this list of conditions and the following disclaimer as
+.\"    the first lines of this file unmodified other than the possible
+.\"    addition of one or more copyright notices.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice(s), 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 COPYRIGHT HOLDER(S) ``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 COPYRIGHT HOLDER(S) 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.
+.\"
+.\" $FreeBSD$
+.\"
+.Dd January 22, 2008
+.Dt BUF_ISLOCKED 9
+.Os
+.Sh NAME
+.Nm BUF_ISLOCKED
+.Nd "returns the state of the lock linked to the buffer"
+.Sh SYNOPSIS
+.In sys/param.h
+.In sys/systm.h
+.In sys/uio.h
+.In sys/bio.h
+.In sys/buf.h
+.Ft int
+.Fn BUF_ISLOCKED "struct buf *bp"
+.Sh DESCRIPTION
+The
+.Fn BUF_ISLOCKED
+function returns the status of the lock linked to the buffer in relation to
+curthread.
+.Pp
+It can return:
+.Bl -tag -width ".Dv LK_EXCLUSIVE"
+.It Dv LK_EXCLUSIVE
+An exclusive lock is held by curthread.
+.It Dv LK_EXCLOTHER
+An exclusive lock is held by someone other than curthread.
+.It Dv LK_SHARED
+A shared lock is held.
+.It Li 0
+The lock is not held by anyone.
+.El
+.Sh SEE ALSO
+.Xr lockstatus 9 ,
+.Xr buf 9 ,
+.Xr BUF_LOCK 9 ,
+.Xr BUF_UNLOCK 9 ,
+.Xr lockmgr 9
+.Sh AUTHORS
+This manual page was written by
+.An Attilio Rao Aq Mt attilio@FreeBSD.org .