opensolaris_uio.c

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    1 /*
    2  * CDDL HEADER START
    3  *
    4  * The contents of this file are subject to the terms of the
    5  * Common Development and Distribution License (the "License").
    6  * You may not use this file except in compliance with the License.
    7  *
    8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
    9  * or http://www.opensolaris.org/os/licensing.
   10  * See the License for the specific language governing permissions
   11  * and limitations under the License.
   12  *
   13  * When distributing Covered Code, include this CDDL HEADER in each
   14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
   15  * If applicable, add the following below this CDDL HEADER, with the
   16  * fields enclosed by brackets "[]" replaced with your own identifying
   17  * information: Portions Copyright [yyyy] [name of copyright owner]
   18  *
   19  * CDDL HEADER END
   20  */
   21 /*
   22  * Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
   23  * Use is subject to license terms.
   24  */
   25 
   26 /*      Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
   27 /*        All Rights Reserved   */
   28 
   29 /*
   30  * University Copyright- Copyright (c) 1982, 1986, 1988
   31  * The Regents of the University of California
   32  * All Rights Reserved
   33  *
   34  * University Acknowledgment- Portions of this document are derived from
   35  * software developed by the University of California, Berkeley, and its
   36  * contributors.
   37  */
   38 
   39 /*
   40  * $FreeBSD$
   41  */
   42 
   43 #include <sys/types.h>
   44 #include <sys/uio.h>
   45 #include <sys/vnode.h>
   46 
   47 /*
   48  * same as uiomove() but doesn't modify uio structure.
   49  * return in cbytes how many bytes were copied.
   50  */
   51 int
   52 uiocopy(void *p, size_t n, enum uio_rw rw, struct uio *uio, size_t *cbytes)
   53 {
   54         struct iovec small_iovec[1];
   55         struct uio small_uio_clone;
   56         struct uio *uio_clone;
   57         int error;
   58 
   59         ASSERT3U(uio->uio_rw, ==, rw);
   60         if (uio->uio_iovcnt == 1) {
   61                 small_uio_clone = *uio;
   62                 small_iovec[0] = *uio->uio_iov;
   63                 small_uio_clone.uio_iov = small_iovec;
   64                 uio_clone = &small_uio_clone;
   65         } else {
   66                 uio_clone = cloneuio(uio);
   67         }
   68 
   69         error = vn_io_fault_uiomove(p, n, uio_clone);
   70         *cbytes = uio->uio_resid - uio_clone->uio_resid;
   71         if (uio_clone != &small_uio_clone)
   72                 free(uio_clone, M_IOV);
   73         return (error);
   74 }
   75 
   76 /*
   77  * Drop the next n chars out of *uiop.
   78  */
   79 void
   80 uioskip(uio_t *uio, size_t n)
   81 {
   82         enum uio_seg segflg;
   83 
   84         /* For the full compatibility with illumos. */
   85         if (n > uio->uio_resid)
   86                 return;
   87 
   88         segflg = uio->uio_segflg;
   89         uio->uio_segflg = UIO_NOCOPY;
   90         uiomove(NULL, n, uio->uio_rw, uio);
   91         uio->uio_segflg = segflg;
   92 }

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FreeBSD/Linux Kernel Cross Reference sys/cddl/compat/opensolaris/kern/opensolaris_uio.c

FreeBSD/Linux Kernel Cross Reference
sys/cddl/compat/opensolaris/kern/opensolaris_uio.c