1994-05-27 05:00:24 +00:00
|
|
|
.\" 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. All advertising materials mentioning features or use of this software
|
|
|
|
|
.\" must display the following acknowledgement:
|
|
|
|
|
.\" This product includes software developed by the University of
|
|
|
|
|
.\" California, Berkeley and its contributors.
|
|
|
|
|
.\" 4. 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 8.2 (Berkeley) 4/15/94
|
|
|
|
|
.\"
|
|
|
|
|
.Dd April 15, 1994
|
|
|
|
|
.Dt MUNMAP 2
|
|
|
|
|
.Os
|
|
|
|
|
.Sh NAME
|
|
|
|
|
.Nm munmap
|
|
|
|
|
.Nd remove a mapping
|
|
|
|
|
.Sh SYNOPSIS
|
1996-02-02 05:06:29 +00:00
|
|
|
.Fd #include <sys/types.h>
|
|
|
|
|
.Fd #include <sys/mman.h>
|
1997-01-11 23:33:18 +00:00
|
|
|
.Ft int
|
1994-05-27 05:00:24 +00:00
|
|
|
.Fn munmap "caddr_t 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,
|
1996-08-22 23:31:07 +00:00
|
|
|
.Fn munmap
|
1994-05-27 05:00:24 +00:00
|
|
|
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, the
|
|
|
|
|
.Fa len
|
|
|
|
|
parameter was negative, or
|
|
|
|
|
some part of the region being unmapped is not part of the currently
|
|
|
|
|
valid address space.
|
|
|
|
|
.Sh "SEE ALSO"
|
|
|
|
|
.Xr madvise 2 ,
|
1996-02-11 22:38:05 +00:00
|
|
|
.Xr mincore 2 ,
|
1997-01-11 23:33:18 +00:00
|
|
|
.Xr msync 2 ,
|
|
|
|
|
.Xr mprotect 2 ,
|
|
|
|
|
.Xr munmap 2 ,
|
1996-02-11 22:38:05 +00:00
|
|
|
.Xr getpagesize 3
|
1994-05-27 05:00:24 +00:00
|
|
|
.Sh HISTORY
|
|
|
|
|
The
|
|
|
|
|
.Fn munmap
|
1996-08-22 23:31:07 +00:00
|
|
|
function first appeared in
|
|
|
|
|
.Bx 4.4 .
|
