bsd/man/man9/copy.9

   1 .\"     $NetBSD: copy.9,v 1.2 1996/01/09 03:23:04 thorpej Exp $
   2 .\"
   3 .\" Copyright (c) 1996 Jason R. Thorpe.
   4 .\" All rights reserved.
   5 .\"
   6 .\" This code is derived from software contributed by Kenneth Stailey.
   7 .\"
   8 .\" Redistribution and use in source and binary forms, with or without
   9 .\" modification, are permitted provided that the following conditions
  10 .\" are met:
  11 .\" 1. Redistributions of source code must retain the above copyright
  12 .\"    notice, this list of conditions and the following disclaimer.
  13 .\" 2. Redistributions in binary form must reproduce the above copyright
  14 .\"    notice, this list of conditions and the following disclaimer in the
  15 .\"    documentation and/or other materials provided with the distribution.
  16 .\" 3. All advertising materials mentioning features or use of this software
  17 .\"    must display the following acknowledgement:
  18 .\"     This product includes software developed for the NetBSD Project
  19 .\"     by Jason R. Thorpe.
  20 .\" 4. The name of the author may not be used to endorse or promote products
  21 .\"    derived from this software without specific prior written permission.
  22 .\"
  23 .\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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  28 .\" BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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  35 .\" $FreeBSD: src/share/man/man9/copy.9,v 1.6.2.5 2001/12/17 11:30:18 ru Exp $
  36 .\"
  37 .Dd January 7, 1996
  38 .Dt COPY 9
  39 .Os
  40 .Sh NAME
  41 .Nm copy ,
  42 .Nm copyin ,
  43 .Nm copyout ,
  44 .Nm copystr ,
  45 .Nm copyinstr
  46 .Nd kernel copy functions
  47 .Sh SYNOPSIS
  48 .In sys/types.h
  49 .In sys/systm.h
  50 .Ft int
  51 .Fn copyin "const void *uaddr" "void *kaddr" "size_t len"
  52 .Ft int
  53 .Fn copyout "const void *kaddr" "void *uaddr" "size_t len"
  54 .Ft int
  55 .Fn copystr "const void *kfaddr" "void *kdaddr" "size_t len" "size_t *done"
  56 .Ft int
  57 .Fn copyinstr "const void *uaddr" "void *kaddr" "size_t len" "size_t *done"
  58 .\" .Ft int
  59 .\" .Fn copyoutstr "const void *kaddr" "void *uaddr" "size_t len" "size_t *done"
  60 .Sh DESCRIPTION
  61 The
  62 .Nm
  63 functions are designed to copy contiguous data from one address
  64 to another.  All but
  65 .Fn copystr
  66 copy data from user-space to kernel-space or vice-versa.
  67 .Pp
  68 The
  69 .Nm
  70 routines provide the following functionality:
  71 .Bl -tag -width "copyoutstr()"
  72 .It Fn copyin
  73 Copies
  74 .Pa len
  75 bytes of data from the user-space address
  76 .Pa uaddr
  77 to the kernel-space address
  78 .Pa kaddr .
  79 .It Fn copyout
  80 Copies
  81 .Pa len
  82 bytes of data from the kernel-space address
  83 .Pa kaddr
  84 to the user-space address
  85 .Pa uaddr .
  86 .It Fn copystr
  87 Copies a NUL-terminated string, at most
  88 .Pa len
  89 bytes long, from kernel-space address
  90 .Pa kfaddr
  91 to kernel-space address
  92 .Pa kdaddr .
  93 The number of bytes actually copied, including the terminating
  94 NUL, is returned in
  95 .Pa *done .
  96 .It Fn copyinstr
  97 Copies a NUL-terminated string, at most
  98 .Pa len
  99 bytes long, from user-space address
 100 .Pa uaddr
 101 to kernel-space address
 102 .Pa kaddr .
 103 The number of bytes actually copied, including the terminating
 104 NUL, is returned in
 105 .Pa *done .
 106 .\" .It Fn copyoutstr
 107 .\" Copies a NUL-terminated string, at most
 108 .\" bytes long, from kernel-space address
 109 .\" .Pa kaddr
 110 .\" to user-space address
 111 .\" .Pa uaddr .
 112 .\" The number of bytes actually copied, including the terminating
 113 .\" NUL, is returned in
 114 .\" .Pa *done .
 115 .El
 116 .Sh RETURN VALUES
 117 The
 118 .Nm
 119 functions return 0 on success or
 120 .Er EFAULT
 121 if a bad address is encountered.
 122 In addition, the
 123 .Fn copystr ,
 124 and
 125 .Fn copyinstr
 126 .\" .Fn copyinstr ,
 127 .\" and
 128 .\" .Fn copyoutstr
 129 functions return
 130 .Er ENAMETOOLONG
 131 if the string is longer than
 132 .Pa len
 133 bytes.
 134 .Sh SEE ALSO
 135 .Xr fetch 9 ,
 136 .Xr store 9