bsd/man/man9/fetch.9

   1 .\"     $NetBSD: fetch.9,v 1.2 1996/01/09 21:59:24 perry Exp $
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   3 .\" Copyright (c) 1996 Jason R. Thorpe.
   4 .\" All rights reserved.
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   6 .\" This code is derived from software contributed by Kenneth Stailey.
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  18 .\"     This product includes software developed for the NetBSD Project
  19 .\"     by Jason R. Thorpe.
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  37 .Dd January 7, 1996
  38 .Dt FETCH 9
  39 .Os
  40 .Sh NAME
  41 .Nm fetch ,
  42 .Nm fubyte ,
  43 .Nm fusword ,
  44 .Nm fuswintr ,
  45 .Nm fuword
  46 .Nd fetch data from user-space
  47 .Sh SYNOPSIS
  48 .In sys/types.h
  49 .In sys/time.h
  50 .In sys/systm.h
  51 .In sys/resourcevar.h
  52 .Ft int
  53 .Fn fubyte "const void *base"
  54 .Ft int
  55 .Fn fusword "void *base"
  56 .Ft int
  57 .Fn fuswintr "void *base"
  58 .Ft long
  59 .Fn fuword "const void *base"
  60 .Sh DESCRIPTION
  61 The
  62 .Nm
  63 functions are designed to copy small amounts of data from user-space.
  64 .Pp
  65 The
  66 .Nm
  67 routines provide the following functionality:
  68 .Bl -tag -width "fuswintr()"
  69 .It Fn fubyte
  70 Fetches a byte of data from the user-space address
  71 .Pa base .
  72 .It Fn fusword
  73 Fetches a short word of data from the user-space address
  74 .Pa base .
  75 .It Fn fuswintr
  76 Fetches a short word of data from the user-space address
  77 .Pa base .
  78 This function is safe to call during an interrupt context.
  79 .It Fn fuword
  80 Fetches a word of data from the user-space address
  81 .Pa base .
  82 .El
  83 .Sh RETURN VALUES
  84 The
  85 .Nm
  86 functions return the data fetched or -1 on failure.
  87 .Sh SEE ALSO
  88 .Xr copy 9 ,
  89 .Xr store 9