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

     /*
      * 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
     * $FreeBSD: src/sys/sys/uio.h,v 1.4.8.1 1999/09/05 08:23:14 peter Exp $
     */
    
    #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,          /* from user data space */
            UIO_SYSSPACE,           /* from system space */
            UIO_USERISPACE,         /* from user I space */
            UIO_NOCOPY              /* don't copy, already in object */
    };
    
    #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 */
    #endif /* KERNEL */
    
    #ifdef KERNEL
    
    int     uiomove __P((caddr_t, int, struct uio *));
    
    #else /* !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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