.\"
.\"	$OpenBSD: vm_map_copy.9,v 1.4 2001/11/06 21:54:41 miod Exp $
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.TH vm_map_copy 9 9/19/93
.CM 4
.SH NAME
.nf
vm_map_copy  \-  copies memory to a destination address
.SH SYNOPSIS
.nf
.ft B
#include <uvm/uvm_map.h>

.nf
.ft B
void vm_map_copy (dst_map, src_map, dst_addr, len, sc_addr, dst_alloc, src_destroy)
	vm_map_t	src_map, dst_map;
	vm_offset_t	src_addr, dst_addr;
	vm_size_t	len;
	boolean_t	dst_alloc, src_destroy;
.fi
.ft P
.SH ARGUMENTS
.TP 15
.B
dst_map
Virtual memory map to be affected.
.TP 15
.B
src_map
Virtual memory map to copy from.
.TP 15
.B
dst_addr
Address in \fBdst_map\fR
of the start of the destination range.
.TP 15
.B
len
Number of bytes to copy.
.TP 15
.B
src_addr
Address in \fBsrc_map\fR
of the start of the source range.
.TP 15
.B
dst_alloc
Allocate space for destination if none exists.
.TP 15
.B
src_destroy
Destroy the source after copy completion.
.SH DESCRIPTION
\fBvm_map_copy\fR causes the source memory range to be copied to
the destination address.  The source and destination memory ranges
may overlap.  The destination address range must already be allocated and
writable; the source range must be readable.

\fBvm_map_copy\fR is equivalent to vm_read followed by vm_write.
.SH DIAGNOSTICS
.TP 25
KERN_SUCCESS
Memory copied.
.TP 25
KERN_PROTECTION_FAILURE
Either the destination region was
not writable, or the source region was not readable.
.TP 25
KERN_INVALID_ADDRESS
Illegal or non-allocated address specified or
insufficient memory allocated at one of the addresses.
.SH BUGS
The current implementation requires that \fBsrc_addr\fR,
\fBlen\fR, and \fBdst_addr\fR all be page-aligned.
Otherwise, KERN_INVALID_ARGUMENT is returned.
.SH SEE ALSO
vm_map_protect(9),