StdLib/Include/sys/uio.h

   1 /*  $NetBSD: uio.h,v 1.34 2006/03/01 12:38:32 yamt 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_rw uio_rw;  /* see above */
  85   struct  vmspace *uio_vmspace;
  86 };
  87 #define UIO_SETUP_SYSSPACE(uio) uio_setup_sysspace(uio)
  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
 105 void uio_setup_sysspace(struct uio *);
 106 #endif
 107
 108 #ifndef _KERNEL
 109 #include <sys/EfiCdefs.h>
 110
 111 __BEGIN_DECLS
 112 #if defined(_NETBSD_SOURCE)
 113 ssize_t preadv(int, const struct iovec *, int, off_t);
 114 ssize_t pwritev(int, const struct iovec *, int, off_t);
 115 #endif /* _NETBSD_SOURCE */
 116 ssize_t readv(int, const struct iovec *, int);
 117 ssize_t writev(int, const struct iovec *, int);
 118 __END_DECLS
 119 #else
 120 int ureadc(int, struct uio *);
 121 #endif /* !_KERNEL */
 122
 123 #endif /* !_SYS_UIO_H_ */