xnu-7195.101.1.tar.gz

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.\"	$NetBSD: fetch.9,v 1.2 1996/01/09 21:59:24 perry Exp $
.\"
.\" Copyright (c) 1996 Jason R. Thorpe.
.\" All rights reserved.
.\"
.\" This code is derived from software contributed by Kenneth Stailey.
.\"
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.\" modification, are permitted provided that the following conditions
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" 3. All advertising materials mentioning features or use of this software
.\"    must display the following acknowledgement:
.\"	This product includes software developed for the NetBSD Project
.\"	by Jason R. Thorpe.
.\" 4. The name of the author may not be used to endorse or promote products
.\"    derived from this software without specific prior written permission.
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.\" $FreeBSD: src/share/man/man9/fetch.9,v 1.6.2.4 2001/12/17 11:30:18 ru Exp $
.\"
.Dd December 16, 2004
.Dt FETCH 9
.Os
.Sh NAME
.Nm fetch ,
.Nm fubyte ,
.Nm fuibyte ,
.Nm fuiword ,
.Nm fulong ,
.Nm fuulong ,
.Nm fuword
.Nd fetch data from user-space
.Sh SYNOPSIS
.In sys/types.h
.In sys/time.h
.In sys/systm.h
.In sys/resourcevar.h
.\"
.Ft int
.Fo fubyte
.Fa "const user_addr_t addr"
.Fc
.Ft int
.Fo fuibyte
.Fa "const user_addr_t addr"
.Fc
.Ft int
.Fo fuiword
.Fa "user_addr_t addr"
.Fc
.Ft int64_t
.Fo fulong
.Fa "user_addr_t addr"
.Fc
.Ft uint64_t
.Fo fuulong
.Fa "user_addr_t addr"
.Fc
.Ft int
.Fo fuword
.Fa "user_addr_t addr"
.Fc
.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 "fuiword()"
.\" ==========
.It Fn fubyte
Fetches a byte of data from the user-space address
.Pa addr .
.\" ==========
.It Fn fuibyte
Fetches a byte of data from the user-space address
.Pa addr .
This function is safe to call during an interrupt context.
.\" ==========
.It Fn fuiword
Fetches a word of data from the user-space address
.Pa addr .
This function is safe to call during an interrupt context.
.\" ==========
.It Fn fulong
Fetches a long word of data from the user-space address
.Pa addr .
.\" ==========
.It Fn fuulong
Fetches a unsigned long word of data from the user-space address
.Pa addr .
.\" ==========
.It Fn fuword
Fetches a word of data from the user-space address
.Pa addr .
.El
.Sh RETURN VALUES
The
.Nm
functions return the data fetched or -1 on failure.
.Sh SEE ALSO
.Xr copy 9 ,
.Xr store 9