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.TH "COPY_FROM_USER" "9" "07 August 2003" "" ""
.SH NAME
copy_from_user \- Copy a block of data from user space.
.SH SYNOPSIS
.sp
\fB
.sp
unsigned long copy_from_user  (void * \fIto\fB, const void __user * \fIfrom\fB, unsigned long \fIn\fB);
\fR
.SH "ARGUMENTS"
.TP
\fB\fIto\fB\fR
Destination address, in kernel space.
.TP
\fB\fIfrom\fB\fR
Source address, in user space.
.TP
\fB\fIn\fB\fR
Number of bytes to copy.
.SH "CONTEXT"
.PP
User context only.  This function may sleep.
.SH "DESCRIPTION"
.PP
Copy data from user space to kernel space.
.PP
Returns number of bytes that could not be copied.
On success, this will be zero.
.PP
If some data could not be copied, this function will pad the copied
data to the requested size using zero bytes.
.SH "ABOUT THIS DOCUMENT"
.PP
This documentation is free software; you can redistribute
it and/or modify it under the terms of the GNU General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later
version.
.PP
This program is distributed in the hope that it will be
useful, but WITHOUT ANY WARRANTY; without even the implied
warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
See the GNU General Public License for more details.
.PP
You should have received a copy of the GNU General Public
License along with this program; if not, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston,
MA 02111-1307 USA
.PP
For more details see the file COPYING in the source
distribution of Linux.
.PP
If you have comments on the formatting of this manpage, then please contact
Michael Still (mikal@stillhq.com).
.PP
This documentation was generated with kernel version 2.6.0.