Manual Pages  — VOP_IOCTL

VOP_IOCTL – device specific control

SYNOPSIS DESCRIPTION LOCKS RETURN VALUES SEE ALSO AUTHORS

#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);

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.

The file should not be locked on entry.

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

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

This manual page was written by Doug Rabson.