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: releng/5.0/sys/sys/uio.h 120688 2003-10-03 13:02:50Z nectar $
     */
    
    #ifndef _SYS_UIO_H_
    #define _SYS_UIO_H_
    
    #include <sys/cdefs.h>
    #include <sys/_types.h>
    
    #ifndef _SIZE_T_DECLARED
    typedef __size_t        size_t;
    #define _SIZE_T_DECLARED
    #endif
    
    #ifndef _SSIZE_T_DECLARED
    typedef __ssize_t       ssize_t;
    #define _SSIZE_T_DECLARED
    #endif
    
    #ifndef _STRUCT_IOVEC_DECLARED
    #define _STRUCT_IOVEC_DECLARED
    struct iovec {
            void    *iov_base;      /* Base address. */
            size_t   iov_len;       /* Length. */
    };
    #endif
    
    #if __BSD_VISIBLE
    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_NOCOPY              /* don't copy, already in object */
    };
    #endif
    
    #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  thread *uio_td;
    };
    
    /*
     * Limits
     *
     * N.B.: UIO_MAXIOV must be no less than IOV_MAX from <sys/syslimits.h>
     * which in turn must be no less than _XOPEN_IOV_MAX from <limits.h>.  If
     * we ever make this tunable (probably pointless), then IOV_MAX should be
     * removed from <sys/syslimits.h> and applications would be expected to use
     * sysconf(3) to find out the correct value, or else assume the worst
     * (_XOPEN_IOV_MAX).  Perhaps UIO_MAXIOV should be simply defined as
     * IOV_MAX.
     */
    #define UIO_MAXIOV      1024            /* max 1K of iov's */
    #define UIO_SMALLIOV    8               /* 8 on stack, else malloc */
    
    struct vm_object;
    
   void    uio_yield(void);
   int     uiomove(caddr_t, int, struct uio *);
   int     uiomove_frombuf(void *buf, int buflen, struct uio *uio);
   int     uiomoveco(caddr_t, int, struct uio *, struct vm_object *, int);
   int     uioread(int, struct uio *, struct vm_object *, int *);
   int     copyinfrom(const void *src, void *dst, size_t len, int seg);
   int     copyinstrfrom(const void *src, void *dst, size_t len,
               size_t *copied, int seg);
   
   #else /* !_KERNEL */
   
   __BEGIN_DECLS
   ssize_t readv(int, const struct iovec *, int);
   ssize_t writev(int, const struct iovec *, int);
   __END_DECLS
   
   #endif /* _KERNEL */
   
   #endif /* !_SYS_UIO_H_ */

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