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.\" Copyright (c) 1996 Doug Rabson
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.\" $FreeBSD$
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.Dd February 10, 2021
.Dt VOP_ADVLOCK 9
.Os
.Sh NAME
.Nm VOP_ADVLOCK
.Nd advisory record locking
.Sh SYNOPSIS
.In sys/param.h
.In sys/vnode.h
.In sys/fcntl.h
.In sys/lockf.h
.Ft int
.Fn VOP_ADVLOCK "struct vnode *vp" "caddr_t id" "int op" "struct flock *fl" "int flags"
.Sh DESCRIPTION
The arguments are:
.Bl -tag -width flags
.It Fa vp
The vnode being manipulated.
.It Fa id
The id token which is changing the lock.
.It Fa op
The operation to perform (see
.Xr fcntl 2 ) .
.It Fa fl
Description of the lock.
.It Fa flags
One or more of the following:
.Pp
.Bl -tag -width ".Dv F_REMOTE" -offset indent -compact
.It Dv F_WAIT
Wait until lock is granted.
.It Dv F_FLOCK
Use
.Xr flock 2
semantics for lock.
.It Dv F_POSIX
Use POSIX semantics for lock.
.It Dv F_REMOTE
Lock owner is remote NFS client.
.It Dv F_NOINTR
Mask signals while waiting for the lock.
.El
.El
.Pp
This entry point manipulates advisory record locks on the file.
Most file systems delegate the work for this call to
.Fn lf_advlock .
.Sh RETURN VALUES
Zero is returned on success, otherwise an error is returned.
.Sh SEE ALSO
.Xr fcntl 2 ,
.Xr flock 2 ,
.Xr vnode 9
.Sh AUTHORS
This manual page was written by
.An Doug Rabson .