bsd/sys/uio.h

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * The contents of this file constitute Original Code as defined in and
   7  * are subject to the Apple Public Source License Version 1.1 (the
   8  * "License").  You may not use this file except in compliance with the
   9  * License.  Please obtain a copy of the License at
  10  * http://www.apple.com/publicsource and read it before using this file.
  11  *
  12  * This Original Code and all software distributed under the License are
  13  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  14  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  15  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
  17  * License for the specific language governing rights and limitations
  18  * under the License.
  19  *
  20  * @APPLE_LICENSE_HEADER_END@
  21  */
  22 /* Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved */
  23 /*
  24  * Copyright (c) 1982, 1986, 1993, 1994
  25  *      The Regents of the University of California.  All rights reserved.
  26  *
  27  * Redistribution and use in source and binary forms, with or without
  28  * modification, are permitted provided that the following conditions
  29  * are met:
  30  * 1. Redistributions of source code must retain the above copyright
  31  *    notice, this list of conditions and the following disclaimer.
  32  * 2. Redistributions in binary form must reproduce the above copyright
  33  *    notice, this list of conditions and the following disclaimer in the
  34  *    documentation and/or other materials provided with the distribution.
  35  * 3. All advertising materials mentioning features or use of this software
  36  *    must display the following acknowledgement:
  37  *      This product includes software developed by the University of
  38  *      California, Berkeley and its contributors.
  39  * 4. Neither the name of the University nor the names of its contributors
  40  *    may be used to endorse or promote products derived from this software
  41  *    without specific prior written permission.
  42  *
  43  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  44  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  45  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  46  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  47  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  48  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  49  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  50  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  51  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  52  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  53  * SUCH DAMAGE.
  54  *
  55  *      @(#)uio.h       8.5 (Berkeley) 2/22/94
  56  */
  57
  58 #ifndef _SYS_UIO_H_
  59 #define _SYS_UIO_H_
  60
  61 /*
  62  * XXX
  63  * iov_base should be a void *.
  64  */
  65 struct iovec {
  66         char    *iov_base;      /* Base address. */
  67         size_t   iov_len;       /* Length. */
  68 };
  69
  70 enum    uio_rw { UIO_READ, UIO_WRITE };
  71
  72 /* Segment flag values. */
  73 enum uio_seg {
  74         UIO_USERSPACE,          /* from user data space */
  75         UIO_USERISPACE,         /* from user I space */
  76         UIO_SYSSPACE,           /* from system space */
  77         UIO_PHYS_USERSPACE      /* kernel address is physical, to/from user data space */
  78 };
  79
  80 #ifdef KERNEL
  81 struct uio {
  82         struct  iovec *uio_iov;
  83         int     uio_iovcnt;
  84         off_t   uio_offset;
  85         int     uio_resid;
  86         enum    uio_seg uio_segflg;
  87         enum    uio_rw uio_rw;
  88         struct  proc *uio_procp;
  89 };
  90
  91 /*
  92  * Limits
  93  */
  94 #define UIO_MAXIOV      1024            /* max 1K of iov's */
  95 #define UIO_SMALLIOV    8               /* 8 on stack, else malloc */
  96
  97 extern int uiomove __P((caddr_t cp, int n, struct uio *uio));
  98 extern int ureadc __P((int c, struct uio *uio));
  99 extern int uwritec __P((struct uio *uio));
 100
 101 #endif /* KERNEL */
 102
 103 #ifndef KERNEL
 104 #include <sys/cdefs.h>
 105
 106 __BEGIN_DECLS
 107 ssize_t readv __P((int, const struct iovec *, int));
 108 ssize_t writev __P((int, const struct iovec *, int));
 109 __END_DECLS
 110 #endif /* !KERNEL */
 111 #endif /* !_SYS_UIO_H_ */