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

     /*      $OpenBSD: uio.h,v 1.19 2018/08/20 16:00:22 mpi Exp $    */
     /*      $NetBSD: uio.h,v 1.12 1996/02/09 18:25:45 christos 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_
    
    #include <sys/cdefs.h>
    #include <sys/_types.h>
    
    #ifndef _SIZE_T_DEFINED_
    #define _SIZE_T_DEFINED_
    typedef __size_t        size_t;
    #endif
    
    #ifndef _SSIZE_T_DEFINED_
    #define _SSIZE_T_DEFINED_
    typedef __ssize_t       ssize_t;
    #endif
    
    struct iovec {
            void    *iov_base;      /* Base address. */
            size_t   iov_len;       /* Length. */
    };
    
    #if __BSD_VISIBLE       /* needed by kdump */
    enum    uio_rw { UIO_READ, UIO_WRITE };
    
    /* Segment flag values. */
    enum uio_seg {
            UIO_USERSPACE,          /* from user data space */
            UIO_SYSSPACE            /* from system space */
    };
    #endif /* __BSD_VISIBLE */
    
    #ifdef _KERNEL
    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_seg uio_segflg; /* see above */
            enum    uio_rw uio_rw;  /* see above */
            struct  proc *uio_procp;/* associated thread or NULL */
    };
    
    /*
     * Limits
     */
    #define UIO_SMALLIOV    8               /* 8 on stack, else malloc */
    #endif /* _KERNEL */
    
    #if __BSD_VISIBLE
    #define UIO_MAXIOV      1024            /* Deprecated, use IOV_MAX instead */
    #endif
    
    #ifndef _KERNEL
    __BEGIN_DECLS
    #if __BSD_VISIBLE
    ssize_t preadv(int, const struct iovec *, int, __off_t);
    ssize_t pwritev(int, const struct iovec *, int, __off_t);
    #endif /* __BSD_VISIBLE */
    ssize_t readv(int, const struct iovec *, int);
    ssize_t writev(int, const struct iovec *, int);
    __END_DECLS
    #else
    int     ureadc(int c, struct uio *);
    
    struct file;
   int     iovec_copyin(const struct iovec *, struct iovec **, struct iovec *,
               unsigned int, size_t *);
   void    iovec_free(struct iovec *, unsigned int );
   int     dofilereadv(struct proc *, int, struct uio *, int, register_t *);
   int     dofilewritev(struct proc *, int, struct uio *, int, register_t *);
   
   #endif /* !_KERNEL */
   
   #endif /* !_SYS_UIO_H_ */

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