NAME    [Toc]    [Back]

     VOP_IOCTL -- device specific control

SYNOPSIS    [Toc]    [Back]

     #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    [Toc]    [Back]

     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

     cnp      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    [Toc]    [Back]

     The file should not be locked on entry.

RETURN VALUES    [Toc]    [Back]

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

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

PSEUDOCODE    [Toc]    [Back]

     int
     vop_ioctl(struct vnode *vp, int command, caddr_t data, int fflag,
	       struct ucred *cred, struct thread *td)
     {

	 return ENOTTY;
     }

SEE ALSO    [Toc]    [Back]

     vnode(9)

AUTHORS    [Toc]    [Back]

     This man page was written by Doug Rabson.


FreeBSD 5.2.1			 July 24, 1996			 FreeBSD 5.2.1