140 lines
4.0 KiB
Groff
140 lines
4.0 KiB
Groff
.\" $NetBSD: copy.9,v 1.10 2001/06/21 11:59:00 wiz Exp $
|
|
.\"
|
|
.\" Copyright (c) 1996 Jason R. Thorpe.
|
|
.\" All rights reserved.
|
|
.\"
|
|
.\" This code is derived from software contributed by Kenneth Stailey.
|
|
.\"
|
|
.\" Redistribution and use in source and binary forms, with or without
|
|
.\" modification, are permitted provided that the following conditions
|
|
.\" are met:
|
|
.\" 1. Redistributions of source code must retain the above copyright
|
|
.\" notice, this list of conditions and the following disclaimer.
|
|
.\" 2. Redistributions in binary form must reproduce the above copyright
|
|
.\" notice, this list of conditions and the following disclaimer in the
|
|
.\" documentation and/or other materials provided with the distribution.
|
|
.\" 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.
|
|
.\"
|
|
.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
|
|
.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
|
|
.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
|
|
.\" IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
|
|
.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
|
|
.\" BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
|
|
.\" LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
|
|
.\" AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
|
|
.\" OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
.\" SUCH DAMAGE.
|
|
.\"
|
|
.Dd February 22, 1998
|
|
.Dt COPY 9
|
|
.Os
|
|
.Sh NAME
|
|
.Nm copy ,
|
|
.Nm copyin ,
|
|
.Nm copyout ,
|
|
.Nm copystr ,
|
|
.Nm copyinstr ,
|
|
.Nm copyoutstr
|
|
.Nd kernel space to/from user space copy functions
|
|
.Sh SYNOPSIS
|
|
.Fd #include <sys/types.h>
|
|
.Fd #include <sys/systm.h>
|
|
.Ft int
|
|
.Fn copyin "const void *uaddr" "void *kaddr" "size_t len"
|
|
.Ft int
|
|
.Fn copyout "const void *kaddr" "void *uaddr" "size_t len"
|
|
.Ft int
|
|
.Fn copystr "const void *kfaddr" "void *kdaddr" "size_t len" "size_t *done"
|
|
.Ft int
|
|
.Fn copyinstr "const void *uaddr" "void *kaddr" "size_t len" "size_t *done"
|
|
.Ft int
|
|
.Fn copyoutstr "const void *kaddr" "void *uaddr" "size_t len" "size_t *done"
|
|
.Sh DESCRIPTION
|
|
The
|
|
.Nm
|
|
functions are designed to copy contiguous data from one address
|
|
to another. All but
|
|
.Fn copystr
|
|
copy data from user-space to kernel-space or vice-versa.
|
|
.Pp
|
|
The
|
|
.Nm
|
|
routines provide the following functionality:
|
|
.Bl -tag -width "copyoutstr()"
|
|
.It Fn copyin
|
|
Copies
|
|
.Fa len
|
|
bytes of data from the user-space address
|
|
.Fa uaddr
|
|
to the kernel-space address
|
|
.Fa kaddr .
|
|
.It Fn copyout
|
|
Copies
|
|
.Fa len
|
|
bytes of data from the kernel-space address
|
|
.Fa kaddr
|
|
to the user-space address
|
|
.Fa uaddr .
|
|
.It Fn copystr
|
|
Copies a NUL-terminated string, at most
|
|
.Fa len
|
|
bytes long, from kernel-space address
|
|
.Fa kfaddr
|
|
to kernel-space address
|
|
.Fa kdaddr .
|
|
If the
|
|
.Fa done
|
|
argument is non-NULL,
|
|
the number of bytes actually copied, including the terminating
|
|
NUL, is returned in
|
|
.Fa *done .
|
|
.It Fn copyinstr
|
|
Copies a NUL-terminated string, at most
|
|
.Fa len
|
|
bytes long, from user-space address
|
|
.Fa uaddr
|
|
to kernel-space address
|
|
.Fa kaddr .
|
|
If the
|
|
.Fa done
|
|
argument is non-NULL,
|
|
the number of bytes actually copied, including the terminating
|
|
NUL, is returned in
|
|
.Fa *done .
|
|
.It Fn copyoutstr
|
|
Copies a NUL-terminated string, at most
|
|
.Fa len
|
|
bytes long, from kernel-space address
|
|
.Fa kaddr
|
|
to user-space address
|
|
.Fa uaddr .
|
|
If the
|
|
.Fa done
|
|
argument is non-NULL,
|
|
the number of bytes actually copied, including the terminating
|
|
NUL, is returned in
|
|
.Fa *done .
|
|
.El
|
|
.Sh RETURN VALUES
|
|
The
|
|
.Nm
|
|
functions return 0 on success or EFAULT if a bad address is encountered.
|
|
In addition, the
|
|
.Fn copystr ,
|
|
.Fn copyinstr ,
|
|
and
|
|
.Fn copyoutstr
|
|
functions return ENAMETOOLONG if the string is longer than
|
|
.Fa len
|
|
bytes.
|
|
.Sh SEE ALSO
|
|
.Xr fetch 9 ,
|
|
.Xr store 9
|