The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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

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    1 /*
    2  * Copyright (c) 1982, 1986, 1993, 1994
    3  *      The Regents of the University of California.  All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  * 3. All advertising materials mentioning features or use of this software
   14  *    must display the following acknowledgement:
   15  *      This product includes software developed by the University of
   16  *      California, Berkeley and its contributors.
   17  * 4. Neither the name of the University nor the names of its contributors
   18  *    may be used to endorse or promote products derived from this software
   19  *    without specific prior written permission.
   20  *
   21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   31  * SUCH DAMAGE.
   32  *
   33  *      @(#)uio.h       8.5 (Berkeley) 2/22/94
   34  * $FreeBSD$
   35  */
   36 
   37 #ifndef _SYS_UIO_H_
   38 #define _SYS_UIO_H_
   39 
   40 /*
   41  * XXX
   42  * iov_base should be a void *.
   43  */
   44 struct iovec {
   45         char    *iov_base;      /* Base address. */
   46         size_t   iov_len;       /* Length. */
   47 };
   48 
   49 enum    uio_rw { UIO_READ, UIO_WRITE };
   50 
   51 /* Segment flag values. */
   52 enum uio_seg {
   53         UIO_USERSPACE,          /* from user data space */
   54         UIO_SYSSPACE,           /* from system space */
   55         UIO_USERISPACE,         /* from user I space */
   56         UIO_NOCOPY              /* don't copy, already in object */
   57 };
   58 
   59 #ifdef _KERNEL
   60 
   61 struct uio {
   62         struct  iovec *uio_iov;
   63         int     uio_iovcnt;
   64         off_t   uio_offset;
   65         int     uio_resid;
   66         enum    uio_seg uio_segflg;
   67         enum    uio_rw uio_rw;
   68         struct  proc *uio_procp;
   69 };
   70 
   71 /*
   72  * Limits
   73  */
   74 #define UIO_MAXIOV      1024            /* max 1K of iov's */
   75 #define UIO_SMALLIOV    8               /* 8 on stack, else malloc */
   76 
   77 struct vm_object;
   78 
   79 void    uio_yield __P((void));
   80 int     uiomove __P((caddr_t, int, struct uio *));
   81 int     uiomove_frombuf __P((void *buf, int buflen, struct uio *uio));
   82 int     uiomoveco __P((caddr_t, int, struct uio *, struct vm_object *));
   83 int     uioread __P((int, struct uio *, struct vm_object *, int *));
   84 
   85 #else /* !_KERNEL */
   86 
   87 #include <sys/cdefs.h>
   88 
   89 __BEGIN_DECLS
   90 ssize_t readv __P((int, const struct iovec *, int));
   91 ssize_t writev __P((int, const struct iovec *, int));
   92 __END_DECLS
   93 
   94 #endif /* _KERNEL */
   95 
   96 #endif /* !_SYS_UIO_H_ */

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