freebsd-skq/share/man/man9/fetch.9

.\"	$NetBSD: fetch.9,v 1.2 1996/01/09 21:59:24 perry Exp $
.\"
.\" Copyright (c) 1996 Jason R. Thorpe.
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.\" This code is derived from software contributed by Kenneth Stailey.
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.\"	This product includes software developed for the NetBSD Project
.\"	by Jason R. Thorpe.
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.Dd Jan 7, 1996
.Dt FETCH 9
.Os FreeBSD
.Sh NAME
.Nm fetch ,
.Nm fubyte ,
.Nm fusword ,
.Nm fuswintr ,
.Nm fuword
.Nd fetch data from user-space
.Sh SYNOPSIS
.Fd #include <sys/types.h>
.Fd #include <sys/time.h>
.Fd #include <sys/systm.h>
.Fd #include <sys/resourcevar.h>
.Ft int
.Fn fubyte "const void *base"
.Ft int
.Fn fusword "void *base"
.Ft int
.Fn fuswintr "void *base"
.Ft long
.Fn fuword "const void *base"
.Sh DESCRIPTION
The
.Nm
functions are designed to copy small amounts of data from user-space.
.Pp
The
.Nm
routines provide the following functionality:
.Bl -tag -width "fuswintr()"
.It Fn fubyte
Fetches a byte of data from the user-space address
.Pa base .
.It Fn fusword
Fetches a short word of data from the user-space address
.Pa base .
.It Fn fuswintr
Fetches a short word of data from the user-space address
.Pa base .
This function is safe to call during an interrupt context.
.It Fn fuword
Fetches a word of data from the user-space address
.Pa base .
.El
.Sh RETURN VALUES
The
.Nm
functions return the data fetched or -1 on failure.
.Sh SEE ALSO
.Xr copy 9 ,
.Xr store 9