Provided by: freebsd-manpages_7.2-1_all
VOP_IOCTL - device specific control
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.
vop_ioctl(struct vnode *vp, int command, caddr_t data, int fflag,
struct ucred *cred, struct thread *td)
This manual page was written by Doug Rabson.