174 lines
4.6 KiB
Groff
174 lines
4.6 KiB
Groff
.\" $NetBSD: copy.9,v 1.2 1996/01/09 03:23:04 thorpej Exp $
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.\"
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.\" Copyright (c) 1996 Jason R. Thorpe.
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.\" All rights reserved.
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.\"
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.\" This code is derived from software contributed by Kenneth Stailey.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed for the NetBSD Project
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.\" by Jason R. Thorpe.
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.\" 4. The name of the author may not be used to endorse or promote products
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.\" derived from this software without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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.\" IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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.\" BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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.\" LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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.\" AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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.\" OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd July 9, 2011
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.Dt COPY 9
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.Os
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.Sh NAME
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.Nm copy ,
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.Nm copyin ,
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.Nm copyin_nofault ,
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.Nm copyout ,
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.Nm copyout_nofault ,
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.Nm copystr ,
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.Nm copyinstr
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.Nd kernel copy functions
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.Sh SYNOPSIS
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.In sys/types.h
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.In sys/systm.h
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.Ft int
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.Fn copyin "const void *uaddr" "void *kaddr" "size_t len"
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.Ft int
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.Fn copyin_nofault "const void *uaddr" "void *kaddr" "size_t len"
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.Ft int
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.Fn copyout "const void *kaddr" "void *uaddr" "size_t len"
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.Ft int
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.Fn copyout_nofault "const void *kaddr" "void *uaddr" "size_t len"
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.Ft int
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.Fn copystr "const void *kfaddr" "void *kdaddr" "size_t len" "size_t *done"
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.Ft int
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.Fn copyinstr "const void *uaddr" "void *kaddr" "size_t len" "size_t *done"
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.\" .Ft int
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.\" .Fn copyoutstr "const void *kaddr" "void *uaddr" "size_t len" "size_t *done"
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.Sh DESCRIPTION
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The
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.Nm
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functions are designed to copy contiguous data from one address
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to another.
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All but
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.Fn copystr
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copy data from user-space to kernel-space or vice-versa.
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.Pp
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The
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.Fn copyin
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and
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.Fn copyin_nofault
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functions copy
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.Fa len
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bytes of data from the user-space address
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.Fa uaddr
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to the kernel-space address
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.Fa kaddr .
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.Pp
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The
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.Fn copyout
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and
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.Fn copyout_nofault
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functions copy
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.Fa len
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bytes of data from the kernel-space address
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.Fa kaddr
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to the user-space address
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.Fa uaddr .
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.Pp
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The
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.Fn copyin_nofault
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and
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.Fn copyout_nofault
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functions require that the kernel-space and user-space data be
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accessible without incurring a page fault.
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The source and destination addresses must be physically mapped for
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read and write access, respectively, and neither the source nor
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destination addresses may be pageable.
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.Pp
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The
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.Fn copystr
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function copies a NUL-terminated string, at most
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.Fa len
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bytes long, from kernel-space address
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.Fa kfaddr
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to kernel-space address
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.Fa kdaddr .
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The number of bytes actually copied, including the terminating
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NUL, is returned in
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.Fa *done
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(if
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.Fa done
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is
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.No non- Ns Dv NULL ) .
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.Pp
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The
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.Fn copyinstr
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function copies a NUL-terminated string, at most
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.Fa len
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bytes long, from user-space address
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.Fa uaddr
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to kernel-space address
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.Fa kaddr .
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The number of bytes actually copied, including the terminating
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NUL, is returned in
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.Fa *done
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(if
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.Fa done
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is
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.No non- Ns Dv NULL ) .
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.\" .It Fn copyoutstr
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.\" Copies a NUL-terminated string, at most
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.\" bytes long, from kernel-space address
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.\" .Fa kaddr
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.\" to user-space address
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.\" .Fa uaddr .
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.\" The number of bytes actually copied, including the terminating
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.\" NUL, is returned in
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.\" .Fa *done .
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.Sh RETURN VALUES
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The
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.Nm
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functions return 0 on success or
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.Er EFAULT
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if a bad address is encountered.
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In addition, the
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.Fn copyin_nofault
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and
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.Fn copyout_nofault
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functions return
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.Er EFAULT
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if a page fault occurs, and the
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.Fn copystr
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and
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.Fn copyinstr
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.\" .Fn copyinstr ,
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.\" and
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.\" .Fn copyoutstr
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functions return
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.Er ENAMETOOLONG
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if the string is longer than
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.Fa len
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bytes.
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.Sh SEE ALSO
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.Xr fetch 9 ,
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.Xr store 9
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