1.\" Copyright (c) 1996 Doug Rabson 2.\" 3.\" All rights reserved. 4.\" 5.\" This program is free software. 6.\" 7.\" Redistribution and use in source and binary forms, with or without 8.\" modification, are permitted provided that the following conditions 9.\" are met: 10.\" 1. Redistributions of source code must retain the above copyright 11.\" notice, this list of conditions and the following disclaimer. 12.\" 2. Redistributions in binary form must reproduce the above copyright 13.\" notice, this list of conditions and the following disclaimer in the 14.\" documentation and/or other materials provided with the distribution. 15.\" 16.\" THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY EXPRESS OR 17.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 18.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 19.\" IN NO EVENT SHALL THE DEVELOPERS BE LIABLE FOR ANY DIRECT, INDIRECT, 20.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 21.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 22.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 23.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 24.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 25.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26.\" 27.\" $FreeBSD: src/share/man/man9/VOP_ADVLOCK.9,v 1.6.2.3 2001/12/17 11:30:18 ru Exp $ 28.\" 29.Dd June 30, 1999 30.Dt VOP_ADVLOCK 9 31.Os 32.Sh NAME 33.Nm VOP_ADVLOCK 34.Nd advisory record locking 35.Sh SYNOPSIS 36.In sys/param.h 37.In sys/vnode.h 38.In sys/fcntl.h 39.In sys/lockf.h 40.Ft int 41.Fn VOP_ADVLOCK "struct vnode *vp" "caddr_t id" "int op" "struct flock *fl" "int flags" 42.Sh DESCRIPTION 43The arguments are: 44.Bl -tag -width flags 45.It Fa vp 46the vnode being manipulated 47.It Fa id 48the id token which is changing the lock 49.It Fa op 50the operation to perform (see 51.Xr fcntl 2 ) 52.It Fa fl 53description of the lock 54.It Fa flags 55One of more of the following: 56.Bl -column ".Dv F_UNLCK" -offset indent 57.It Dv F_RDLCK Ta "shared or read lock" 58.It Dv F_UNLCK Ta "unlock" 59.It Dv F_WRLCK Ta "exclusive or write lock" 60.It Dv F_WAIT Ta "Wait until lock is granted" 61.It Dv F_POSIX Ta "Use POSIX semantics for lock" 62.El 63.El 64.Pp 65This entry point manipulates advisory record locks on the file. Most 66filesystems delegate the work for this call to 67.Fn lf_advlock . 68.Sh RETURN VALUES 69Zero is returned on success, otherwise an error is returned. 70.Sh SEE ALSO 71.Xr fcntl 2 , 72.Xr flock 2 , 73.Xr vnode 9 74.Sh AUTHORS 75This man page was written by 76.An Doug Rabson . 77