NAME

VOP_IOCTL — device specific control

SYNOPSIS

#include < sys/param.h>
#include < sys/vnode.h>

int
VOP_IOCTL( struct vnode *vp, u_long command, caddr_t data, int fflag, struct ucred *cred, struct thread *td);

DESCRIPTION

Manipulate a file in device dependent ways.

Its arguments are:

vp

The vnode of the file (normally representing a device).

command

The device specific operation to perform.

data

Extra data for the specified operation.

fflag

Some flags ???

cred

The caller's credentials.

td

The calling thread.

Most file systems do not implement this entry point.

LOCKS

The file should not be locked on entry.

RETURN VALUES

If successful, zero is returned, otherwise an appropriate error code.

If the ioctl is not recognized or not handled, ENOTTY should be returned.

SEE ALSO

vnode(9)

AUTHORS

This manual page was written by Doug Rabson.