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 /*      $NetBSD: uio.h,v 1.31 2003/09/13 16:59:29 erh Exp $     */
    2 
    3 /*
    4  * Copyright (c) 1982, 1986, 1993, 1994
    5  *      The Regents of the University of California.  All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  * 3. Neither the name of the University nor the names of its contributors
   16  *    may be used to endorse or promote products derived from this software
   17  *    without specific prior written permission.
   18  *
   19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   29  * SUCH DAMAGE.
   30  *
   31  *      @(#)uio.h       8.5 (Berkeley) 2/22/94
   32  */
   33 
   34 #ifndef _SYS_UIO_H_
   35 #define _SYS_UIO_H_
   36 
   37 #ifdef _KERNEL
   38 #ifndef __UIO_EXPOSE
   39 #define __UIO_EXPOSE
   40 #endif
   41 #endif
   42 
   43 #include <machine/ansi.h>
   44 #include <sys/featuretest.h>
   45 
   46 #ifdef  _BSD_SIZE_T_
   47 typedef _BSD_SIZE_T_    size_t;
   48 #undef  _BSD_SIZE_T_
   49 #endif
   50 
   51 #ifdef  _BSD_SSIZE_T_
   52 typedef _BSD_SSIZE_T_   ssize_t;
   53 #undef  _BSD_SSIZE_T_
   54 #endif
   55 
   56 struct iovec {
   57         void    *iov_base;      /* Base address. */
   58         size_t   iov_len;       /* Length. */
   59 };
   60 
   61 #if defined(_NETBSD_SOURCE)
   62 #include <sys/ansi.h>
   63 
   64 #ifndef off_t
   65 typedef __off_t         off_t;  /* file offset */
   66 #define off_t           __off_t
   67 #endif
   68 
   69 enum    uio_rw { UIO_READ, UIO_WRITE };
   70 
   71 /* Segment flag values. */
   72 enum uio_seg {
   73         UIO_USERSPACE,          /* from user data space */
   74         UIO_SYSSPACE            /* from system space */
   75 };
   76 
   77 #ifdef __UIO_EXPOSE
   78 
   79 struct uio {
   80         struct  iovec *uio_iov; /* pointer to array of iovecs */
   81         int     uio_iovcnt;     /* number of iovecs in array */
   82         off_t   uio_offset;     /* offset into file this uio corresponds to */
   83         size_t  uio_resid;      /* residual i/o count */
   84         enum    uio_seg uio_segflg; /* see above */
   85         enum    uio_rw uio_rw;  /* see above */
   86         struct  proc *uio_procp;/* process if UIO_USERSPACE */
   87 };
   88 
   89 #endif /* __UIO_EXPOSE */
   90 
   91 /*
   92  * Limits
   93  */
   94 /* Deprecated: use IOV_MAX from <limits.h> instead. */
   95 #define UIO_MAXIOV      1024            /* max 1K of iov's */
   96 #endif /* _NETBSD_SOURCE */
   97 
   98 #ifdef _KERNEL
   99 #include <sys/mallocvar.h>
  100 
  101 MALLOC_DECLARE(M_IOV);
  102 
  103 #define UIO_SMALLIOV    8               /* 8 on stack, else malloc */
  104 #endif
  105 
  106 #ifndef _KERNEL
  107 #include <sys/cdefs.h>
  108 
  109 __BEGIN_DECLS
  110 #if defined(_NETBSD_SOURCE)
  111 ssize_t preadv __P((int, const struct iovec *, int, off_t));
  112 ssize_t pwritev __P((int, const struct iovec *, int, off_t));
  113 #endif /* _NETBSD_SOURCE */
  114 ssize_t readv __P((int, const struct iovec *, int));
  115 ssize_t writev __P((int, const struct iovec *, int));
  116 __END_DECLS
  117 #else
  118 int ureadc __P((int, struct uio *));
  119 #endif /* !_KERNEL */
  120 
  121 #endif /* !_SYS_UIO_H_ */

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