Function vn_ioctl

freebsd/kern/vfs_vnops.c:1619–1666

* File table vnode ioctl routine. */

 * File table vnode ioctl routine.
 */
static int
vn_ioctl(struct file *fp, u_long com, void *data, struct ucred *active_cred,
    struct thread *td)
{
	struct vattr vattr;
	struct vnode *vp;
	struct fiobmap2_arg *bmarg;
	int error;

	vp = fp->f_vnode;
	switch (vp->v_type) {
	case VDIR:
	case VREG:
		switch (com) {
		case FIONREAD:
			vn_lock(vp, LK_SHARED | LK_RETRY);
			error = VOP_GETATTR(vp, &vattr, active_cred);
			VOP_UNLOCK(vp);
			if (error == 0)
				*(int *)data = vattr.va_size - fp->f_offset;
			return (error);
		case FIOBMAP2:
			bmarg = (struct fiobmap2_arg *)data;
			vn_lock(vp, LK_SHARED | LK_RETRY);
#ifdef MAC
			error = mac_vnode_check_read(active_cred, fp->f_cred,
			    vp);
			if (error == 0)
#endif
				error = VOP_BMAP(vp, bmarg->bn, NULL,
				    &bmarg->bn, &bmarg->runp, &bmarg->runb);
			VOP_UNLOCK(vp);
			return (error);
		case FIONBIO:
		case FIOASYNC:
			return (0);
		default:
			return (VOP_IOCTL(vp, com, data, fp->f_flag,
			    active_cred, td));
		}
		break;
	case VCHR:
		return (VOP_IOCTL(vp, com, data, fp->f_flag,
		    active_cred, td));
	default:
		return (ENOTTY);
	}
}

/*
 * File table vnode poll routine.