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+.\"	$NetBSD: munmap.2,v 1.21 2014/05/30 16:11:01 njoly Exp $
+.\"
+.\" Copyright (c) 1991, 1993
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" 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. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 REGENTS OR CONTRIBUTORS 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.
+.\"
+.\"	@(#)munmap.2	8.3 (Berkeley) 5/27/94
+.\"
+.Dd May 27, 1994
+.Dt MUNMAP 2
+.Os
+.Sh NAME
+.Nm munmap
+.Nd remove a mapping
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In sys/mman.h
+.Ft int
+.Fn munmap "void *addr" "size_t len"
+.Sh DESCRIPTION
+The
+.Fn munmap
+system call
+deletes the mappings for the specified address range,
+and causes further references to addresses within the range
+to generate invalid memory references.
+.Sh RETURN VALUES
+Upon successful completion,
+.Nm munmap
+returns zero.
+Otherwise, a value of \-1 is returned and
+.Va errno
+is set to indicate the error.
+.Sh ERRORS
+.Fn munmap
+will fail if:
+.Bl -tag -width Er
+.It Bq Er EINVAL
+The
+.Fa addr
+parameter was not page aligned, or
+some part of the region being unmapped is outside the
+valid address range for a process.
+.El
+.Sh SEE ALSO
+.Xr madvise 2 ,
+.Xr mincore 2 ,
+.Xr mlock 2 ,
+.Xr mmap 2 ,
+.Xr mprotect 2 ,
+.Xr msync 2 ,
+.Xr getpagesize 3
+.Sh STANDARDS
+The
+.Fn munmap
+function conforms to
+.St -p1003.1b-93 .
+.Sh HISTORY
+The
+.Fn munmap
+function first appeared in
+.Bx 4.4 .