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.\" $FreeBSD: release/9.1.0/share/man/man9/VOP_IOCTL.9 206622 2010-04-14 19:08:06Z uqs $
.\"
.Dd July 24, 1996
.Dt VOP_IOCTL 9
.Os
.Sh NAME
.Nm VOP_IOCTL
.Nd device specific control
.Sh SYNOPSIS
.In sys/param.h
.In sys/vnode.h
.Ft int
.Fn VOP_IOCTL "struct vnode *vp" "u_long command" "caddr_t data" "int fflag" "struct ucred *cred" "struct thread *td"
.Sh DESCRIPTION
Manipulate a file in device dependent ways.
.Pp
Its arguments are:
.Bl -tag -width command
.It Fa vp
The vnode of the file (normally representing a device).
.It Fa command
The device specific operation to perform.
.It Fa data
Extra data for the specified operation.
.It Fa fflag
Some flags ???
.It Fa cred
The caller's credentials.
.It Fa td
The calling thread.
.El
.Pp
Most file systems do not implement this entry point.
.Sh LOCKS
The file should not be locked on entry.
.Sh RETURN VALUES
If successful, zero is returned, otherwise an appropriate error code.
.Pp
If the ioctl is not recognized or not handled,
.Er ENOTTY
should be returned.
.Sh SEE ALSO
.Xr vnode 9
.Sh AUTHORS
This manual page was written by
.An Doug Rabson .