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

     /*      $NetBSD: uio.h,v 1.36 2011/07/27 13:20:07 uebayasi Exp $        */
     
     /*
      * 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. 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_
    
    #ifdef _KERNEL
    #ifndef __UIO_EXPOSE
    #define __UIO_EXPOSE
    #endif
    #endif
    
    #include <machine/ansi.h>
    #include <sys/featuretest.h>
    
    #ifdef  _BSD_SIZE_T_
    typedef _BSD_SIZE_T_    size_t;
    #undef  _BSD_SIZE_T_
    #endif
    
    #ifdef  _BSD_SSIZE_T_
    typedef _BSD_SSIZE_T_   ssize_t;
    #undef  _BSD_SSIZE_T_
    #endif
    
    struct iovec {
            void    *iov_base;      /* Base address. */
            size_t   iov_len;       /* Length. */
    };
    
    #if defined(_NETBSD_SOURCE)
    #include <sys/ansi.h>
    
    #ifndef off_t
    typedef __off_t         off_t;  /* file offset */
    #define off_t           __off_t
    #endif
    
    enum    uio_rw { UIO_READ, UIO_WRITE };
    
    /* Segment flag values. */
    enum uio_seg {
            UIO_USERSPACE,          /* from user data space */
            UIO_SYSSPACE            /* from system space */
    };
    
    #ifdef __UIO_EXPOSE
    
    struct vmspace;
    
    struct uio {
            struct  iovec *uio_iov; /* pointer to array of iovecs */
            int     uio_iovcnt;     /* number of iovecs in array */
            off_t   uio_offset;     /* offset into file this uio corresponds to */
            size_t  uio_resid;      /* residual i/o count */
            enum    uio_rw uio_rw;  /* see above */
            struct  vmspace *uio_vmspace;
    };
    #define UIO_SETUP_SYSSPACE(uio) uio_setup_sysspace(uio)
    
    #endif /* __UIO_EXPOSE */
    
    /*
     * Limits
     */
    /* Deprecated: use IOV_MAX from <limits.h> instead. */
    #define UIO_MAXIOV      1024            /* max 1K of iov's */
    #endif /* _NETBSD_SOURCE */
    
   #ifdef _KERNEL
   
   /* 8 on stack, more will be dynamically allocated. */
   #define UIO_SMALLIOV    8
   
   void uio_setup_sysspace(struct uio *);
   #endif
   
   #ifndef _KERNEL
   #include <sys/cdefs.h>
   
   __BEGIN_DECLS
   #if defined(_NETBSD_SOURCE)
   ssize_t preadv(int, const struct iovec *, int, off_t);
   ssize_t pwritev(int, const struct iovec *, int, off_t);
   #endif /* _NETBSD_SOURCE */
   ssize_t readv(int, const struct iovec *, int);
   ssize_t writev(int, const struct iovec *, int);
   __END_DECLS
   #else
   int ureadc(int, struct uio *);
   #endif /* !_KERNEL */
   
   #endif /* !_SYS_UIO_H_ */

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