VOP_IOCTL man page on DragonFly

VOP_IOCTL man page on DragonFly

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VOP_IOCTL(9)		 BSD Kernel Developer's Manual		  VOP_IOCTL(9)

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 proc *p);

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

     cnp      extra data for the specified operation

     fflag    some flags ???

     cred     the caller's credentials

     p	      the calling process

     Most filesystems 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.

PSEUDOCODE
     int
     vop_ioctl(struct vnode *vp, int command, caddr_t data, int fflag,
	       struct ucred *cred, struct proc *p)
     {
	 return EOPNOTSUPP;
     }

SEE ALSO
     vnode(9)

AUTHORS
     This man page was written by Doug Rabson.

BSD				 July 24, 1996				   BSD

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