FreeBSD/Linux Kernel Cross Reference
sys/bsd/sys/uio.h

     /*
      * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
      *
      * @APPLE_LICENSE_HEADER_START@
      * 
      * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
      * 
      * This file contains Original Code and/or Modifications of Original Code
      * as defined in and that are subject to the Apple Public Source License
     * Version 2.0 (the 'License'). You may not use this file except in
     * compliance with the License. Please obtain a copy of the License at
     * http://www.opensource.apple.com/apsl/ and read it before using this
     * file.
     * 
     * The Original Code and all software distributed under the License are
     * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
     * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
     * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
     * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
     * Please see the License for the specific language governing rights and
     * limitations under the License.
     * 
     * @APPLE_LICENSE_HEADER_END@
     */
    /* Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved */
    /*
     * Copyright (c) 1982, 1986, 1993, 1994
     *      The Regents of the University of California.  All rights reserved.
     *
     * Redistribution and use in source and binary forms, with or without
     * modification, are permitted provided that the following conditions
     * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     * 3. All advertising materials mentioning features or use of this software
     *    must display the following acknowledgement:
     *      This product includes software developed by the University of
     *      California, Berkeley and its contributors.
     * 4. Neither the name of the University nor the names of its contributors
     *    may be used to endorse or promote products derived from this software
     *    without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     *      @(#)uio.h       8.5 (Berkeley) 2/22/94
     */
    
    #ifndef _SYS_UIO_H_
    #define _SYS_UIO_H_
    
    /*
     * XXX
     * iov_base should be a void *.
     */
    struct iovec {
            char    *iov_base;      /* Base address. */
            size_t   iov_len;       /* Length. */
    };
    
    enum    uio_rw { UIO_READ, UIO_WRITE };
    
    /* Segment flag values. */
    enum uio_seg {
            UIO_USERSPACE,          /* kernel address is virtual,  to/from user virtual */
            UIO_USERISPACE,         /* kernel address is virtual,  to/from user virtual */
            UIO_SYSSPACE,           /* kernel address is virtual,  to/from system virtual */
            UIO_PHYS_USERSPACE,     /* kernel address is physical, to/from user virtual */
            UIO_PHYS_SYSSPACE,      /* kernel address is physical, to/from system virtual */
    };
    
    #ifdef KERNEL
    struct uio {
            struct  iovec *uio_iov;
            int     uio_iovcnt;
            off_t   uio_offset;
            int     uio_resid;
            enum    uio_seg uio_segflg;
            enum    uio_rw uio_rw;
            struct  proc *uio_procp;
    };
    
    /*
     * Limits
     */
    #define UIO_MAXIOV      1024            /* max 1K of iov's */
    #define UIO_SMALLIOV    8               /* 8 on stack, else malloc */
   
   extern int uiomove __P((caddr_t cp, int n, struct uio *uio));
   extern int uiomove64 __P((unsigned long long cp, int n, struct uio *uio));
   extern int ureadc __P((int c, struct uio *uio));
   extern int uwritec __P((struct uio *uio));
   
   #endif /* KERNEL */
   
   #ifndef KERNEL
   #include <sys/cdefs.h>
   
   __BEGIN_DECLS
   ssize_t readv __P((int, const struct iovec *, int));
   ssize_t writev __P((int, const struct iovec *, int));
   __END_DECLS
   #endif /* !KERNEL */
   #endif /* !_SYS_UIO_H_ */

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