2012-11-15 12:06:41 +01:00
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.\" $NetBSD: munmap.2,v 1.20 2011/10/15 21:35:50 rmind Exp $
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2011-02-14 20:36:03 +01:00
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.\"
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.\" Copyright (c) 1991, 1993
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.\" The Regents of the University of California. All rights reserved.
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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. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, 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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.\" @(#)munmap.2 8.3 (Berkeley) 5/27/94
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.\"
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.Dd May 27, 1994
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.Dt MUNMAP 2
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.Os
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.Sh NAME
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.Nm munmap
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.Nd remove a mapping
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.Sh LIBRARY
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.Lb libc
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.Sh SYNOPSIS
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.In sys/mman.h
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.Ft int
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.Fn munmap "void *addr" "size_t len"
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.Sh DESCRIPTION
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The
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.Fn munmap
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system call
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deletes the mappings for the specified address range,
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and causes further references to addresses within the range
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to generate invalid memory references.
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.Sh RETURN VALUES
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Upon successful completion,
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.Nm munmap
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returns zero.
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Otherwise, a value of \-1 is returned and
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.Va errno
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is set to indicate the error.
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.Sh ERRORS
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.Fn munmap
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will fail if:
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.Bl -tag -width Er
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.It Bq Er EINVAL
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The
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.Fa addr
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parameter was not page aligned, the
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.Fa len
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parameter was negative, or
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some part of the region being unmapped is outside the
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valid address range for a process.
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.El
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.Sh SEE ALSO
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.Xr madvise 2 ,
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.Xr mincore 2 ,
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.Xr mlock 2 ,
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.Xr mmap 2 ,
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.Xr mprotect 2 ,
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.Xr msync 2 ,
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.Xr getpagesize 3
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2012-11-15 12:06:41 +01:00
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.Sh STANDARDS
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The
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.Fn munmap
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function conforms to
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.St -p1003.1b-93 .
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2011-02-14 20:36:03 +01:00
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.Sh HISTORY
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The
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.Fn munmap
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function first appeared in
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.Bx 4.4 .
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