NetBSD/share/man/man9/copy.9

.\"	$NetBSD: copy.9,v 1.5 1997/11/11 10:06:55 mrg Exp $
.\"
.\" Copyright (c) 1996 Jason R. Thorpe.
.\" All rights reserved.
.\"
.\" 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 COPY 9
.Os NetBSD
.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 NULL-terminated string, at most
.Fa len
bytes long, from kernel-space address
.Fa kfaddr
to kernel-space address
.Fa kdaddr .
The number of bytes actually copied, including the terminating
NULL, is returned in
.Fa *done .
.It Fn copyinstr
Copies a NULL-terminated string, at most
.Fa len
bytes long, from user-space address
.Fa uaddr
to kernel-space address
.Fa kaddr .
The number of bytes actually copied, including the terminating
NULL, is returned in
.Fa *done .
.It Fn copyoutstr
Copies a NULL-terminated string, at most
bytes long, from kernel-space address
.Fa kaddr
to user-space address
.Fa uaddr .
The number of bytes actually copied, including the terminating
NULL, 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
funtions return ENAMETOOLONG if the string is longer than
.Fa len
bytes.
.Sh SEE ALSO
.Xr fetch 9 ,
.Xr store 9 .