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: releng/5.1/sys/sys/uio.h 120688 2003-10-03 13:02:50Z nectar $
   35  */
   36 
   37 #ifndef _SYS_UIO_H_
   38 #define _SYS_UIO_H_
   39 
   40 #include <sys/cdefs.h>
   41 #include <sys/_types.h>
   42 #include <sys/_iovec.h>
   43 
   44 #ifndef _SSIZE_T_DECLARED
   45 typedef __ssize_t       ssize_t;
   46 #define _SSIZE_T_DECLARED
   47 #endif
   48 
   49 #if __BSD_VISIBLE
   50 enum    uio_rw { UIO_READ, UIO_WRITE };
   51 
   52 /* Segment flag values. */
   53 enum uio_seg {
   54         UIO_USERSPACE,          /* from user data space */
   55         UIO_SYSSPACE,           /* from system space */
   56         UIO_NOCOPY              /* don't copy, already in object */
   57 };
   58 #endif
   59 
   60 #ifdef _KERNEL
   61 
   62 struct uio {
   63         struct  iovec *uio_iov;
   64         int     uio_iovcnt;
   65         off_t   uio_offset;
   66         int     uio_resid;
   67         enum    uio_seg uio_segflg;
   68         enum    uio_rw uio_rw;
   69         struct  thread *uio_td;
   70 };
   71 
   72 /*
   73  * Limits
   74  *
   75  * N.B.: UIO_MAXIOV must be no less than IOV_MAX from <sys/syslimits.h>
   76  * which in turn must be no less than _XOPEN_IOV_MAX from <limits.h>.  If
   77  * we ever make this tunable (probably pointless), then IOV_MAX should be
   78  * removed from <sys/syslimits.h> and applications would be expected to use
   79  * sysconf(3) to find out the correct value, or else assume the worst
   80  * (_XOPEN_IOV_MAX).  Perhaps UIO_MAXIOV should be simply defined as
   81  * IOV_MAX.
   82  */
   83 #define UIO_MAXIOV      1024            /* max 1K of iov's */
   84 #define UIO_SMALLIOV    8               /* 8 on stack, else malloc */
   85 
   86 struct vm_object;
   87 
   88 void    uio_yield(void);
   89 int     uiomove(void *, int, struct uio *);
   90 int     uiomove_frombuf(void *buf, int buflen, struct uio *uio);
   91 int     uiomoveco(void *, int, struct uio *, struct vm_object *, int);
   92 int     copyinfrom(const void *src, void *dst, size_t len, int seg);
   93 int     copyinstrfrom(const void *src, void *dst, size_t len,
   94             size_t *copied, int seg);
   95 
   96 #else /* !_KERNEL */
   97 
   98 __BEGIN_DECLS
   99 ssize_t readv(int, const struct iovec *, int);
  100 ssize_t writev(int, const struct iovec *, int);
  101 __END_DECLS
  102 
  103 #endif /* _KERNEL */
  104 
  105 #endif /* !_SYS_UIO_H_ */

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