1.\" Copyright (c) 1991, 1993 2.\" The Regents of the University of California. All rights reserved. 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice, this list of conditions and the following disclaimer. 9.\" 2. Redistributions in binary form must reproduce the above copyright 10.\" notice, this list of conditions and the following disclaimer in the 11.\" documentation and/or other materials provided with the distribution. 12.\" 3. All advertising materials mentioning features or use of this software 13.\" must display the following acknowledgement: 14.\" This product includes software developed by the University of 15.\" California, Berkeley and its contributors. 16.\" 4. Neither the name of the University nor the names of its contributors 17.\" may be used to endorse or promote products derived from this software 18.\" without specific prior written permission. 19.\" 20.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30.\" SUCH DAMAGE. 31.\" 32.\" @(#)munmap.2 8.3 (Berkeley) 5/27/94 33.\" $FreeBSD$ 34.\" 35.Dd May 27, 1994 36.Dt MUNMAP 2 37.Os 38.Sh NAME 39.Nm munmap 40.Nd remove a mapping 41.Sh LIBRARY 42.Lb libc 43.Sh SYNOPSIS 44.In sys/mman.h 45.Ft int 46.Fn munmap "void *addr" "size_t len" 47.Sh DESCRIPTION 48The 49.Fn munmap 50system call 51deletes the mappings for the specified address range, 52and causes further references to addresses within the range 53to generate invalid memory references. 54.Sh RETURN VALUES 55.Rv -std munmap 56.Sh ERRORS 57The 58.Fn munmap 59system call 60will fail if: 61.Bl -tag -width Er 62.It Bq Er EINVAL 63The 64.Fa addr 65parameter was not page aligned, the 66.Fa len 67parameter was negative, or 68some part of the region being unmapped is outside the 69valid address range for a process. 70.El 71.Sh "SEE ALSO" 72.Xr madvise 2 , 73.Xr mincore 2 , 74.Xr mmap 2 , 75.Xr mprotect 2 , 76.Xr msync 2 , 77.Xr getpagesize 3 78.Sh HISTORY 79The 80.Fn munmap 81system call first appeared in 82.Bx 4.4 . 83