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
AUTHORS
This manual page was written by Doug Rabson.