1*8269e767SBrooks Davis.\" Copyright (c) 1991, 1993 2*8269e767SBrooks Davis.\" The Regents of the University of California. All rights reserved. 3*8269e767SBrooks Davis.\" 4*8269e767SBrooks Davis.\" Redistribution and use in source and binary forms, with or without 5*8269e767SBrooks Davis.\" modification, are permitted provided that the following conditions 6*8269e767SBrooks Davis.\" are met: 7*8269e767SBrooks Davis.\" 1. Redistributions of source code must retain the above copyright 8*8269e767SBrooks Davis.\" notice, this list of conditions and the following disclaimer. 9*8269e767SBrooks Davis.\" 2. Redistributions in binary form must reproduce the above copyright 10*8269e767SBrooks Davis.\" notice, this list of conditions and the following disclaimer in the 11*8269e767SBrooks Davis.\" documentation and/or other materials provided with the distribution. 12*8269e767SBrooks Davis.\" 3. Neither the name of the University nor the names of its contributors 13*8269e767SBrooks Davis.\" may be used to endorse or promote products derived from this software 14*8269e767SBrooks Davis.\" without specific prior written permission. 15*8269e767SBrooks Davis.\" 16*8269e767SBrooks Davis.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 17*8269e767SBrooks Davis.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18*8269e767SBrooks Davis.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19*8269e767SBrooks Davis.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 20*8269e767SBrooks Davis.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21*8269e767SBrooks Davis.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22*8269e767SBrooks Davis.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23*8269e767SBrooks Davis.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24*8269e767SBrooks Davis.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25*8269e767SBrooks Davis.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26*8269e767SBrooks Davis.\" SUCH DAMAGE. 27*8269e767SBrooks Davis.\" 28*8269e767SBrooks Davis.Dd June 22, 2017 29*8269e767SBrooks Davis.Dt MUNMAP 2 30*8269e767SBrooks Davis.Os 31*8269e767SBrooks Davis.Sh NAME 32*8269e767SBrooks Davis.Nm munmap 33*8269e767SBrooks Davis.Nd remove a mapping 34*8269e767SBrooks Davis.Sh LIBRARY 35*8269e767SBrooks Davis.Lb libc 36*8269e767SBrooks Davis.Sh SYNOPSIS 37*8269e767SBrooks Davis.In sys/mman.h 38*8269e767SBrooks Davis.Ft int 39*8269e767SBrooks Davis.Fn munmap "void *addr" "size_t len" 40*8269e767SBrooks Davis.Sh DESCRIPTION 41*8269e767SBrooks DavisThe 42*8269e767SBrooks Davis.Fn munmap 43*8269e767SBrooks Davissystem call 44*8269e767SBrooks Davisdeletes the mappings and guards for the specified address range, 45*8269e767SBrooks Davisand causes further references to addresses within the range 46*8269e767SBrooks Davisto generate invalid memory references. 47*8269e767SBrooks Davis.Sh RETURN VALUES 48*8269e767SBrooks Davis.Rv -std munmap 49*8269e767SBrooks Davis.Sh ERRORS 50*8269e767SBrooks DavisThe 51*8269e767SBrooks Davis.Fn munmap 52*8269e767SBrooks Davissystem call 53*8269e767SBrooks Daviswill fail if: 54*8269e767SBrooks Davis.Bl -tag -width Er 55*8269e767SBrooks Davis.It Bq Er EINVAL 56*8269e767SBrooks DavisThe 57*8269e767SBrooks Davis.Fa addr 58*8269e767SBrooks Davisargument was not page aligned, the 59*8269e767SBrooks Davis.Fa len 60*8269e767SBrooks Davisargument was zero or negative, or 61*8269e767SBrooks Davissome part of the region being unmapped is outside the 62*8269e767SBrooks Davisvalid address range for a process. 63*8269e767SBrooks Davis.El 64*8269e767SBrooks Davis.Sh "SEE ALSO" 65*8269e767SBrooks Davis.Xr madvise 2 , 66*8269e767SBrooks Davis.Xr mincore 2 , 67*8269e767SBrooks Davis.Xr mmap 2 , 68*8269e767SBrooks Davis.Xr mprotect 2 , 69*8269e767SBrooks Davis.Xr msync 2 , 70*8269e767SBrooks Davis.Xr getpagesize 3 71*8269e767SBrooks Davis.Sh HISTORY 72*8269e767SBrooks DavisThe 73*8269e767SBrooks Davis.Fn munmap 74*8269e767SBrooks Davissystem call first appeared in 75*8269e767SBrooks Davis.Bx 4.4 . 76