| | 1 | .\" $NetBSD: munmap.2,v 1.5 1995/02/27 12:35:03 cgd Exp $ |
| | 2 | .\" |
| | 3 | .\" Copyright (c) 1991, 1993 |
| | 4 | .\" The Regents of the University of California. All rights reserved. |
| | 5 | .\" |
| | 6 | .\" Redistribution and use in source and binary forms, with or without |
| | 7 | .\" modification, are permitted provided that the following conditions |
| | 8 | .\" are met: |
| | 9 | .\" 1. Redistributions of source code must retain the above copyright |
| | 10 | .\" notice, this list of conditions and the following disclaimer. |
| | 11 | .\" 2. Redistributions in binary form must reproduce the above copyright |
| | 12 | .\" notice, this list of conditions and the following disclaimer in the |
| | 13 | .\" documentation and/or other materials provided with the distribution. |
| | 14 | .\" 3. All advertising materials mentioning features or use of this software |
| | 15 | .\" must display the following acknowledgement: |
| | 16 | .\" This product includes software developed by the University of |
| | 17 | .\" California, Berkeley and its contributors. |
| | 18 | .\" 4. Neither the name of the University nor the names of its contributors |
| | 19 | .\" may be used to endorse or promote products derived from this software |
| | 20 | .\" without specific prior written permission. |
| | 21 | .\" |
| | 22 | .\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
| | 23 | .\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| | 24 | .\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| | 25 | .\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
| | 26 | .\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| | 27 | .\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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| | 31 | .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| | 32 | .\" SUCH DAMAGE. |
| | 33 | .\" |
| | 34 | .\" @(#)munmap.2 8.2 (Berkeley) 4/15/94 |
| | 35 | .\" |
| | 36 | .Dd April 15, 1994 |
| | 37 | .Dt MUNMAP 2 |
| | 38 | .Os |
| | 39 | .Sh NAME |
| | 40 | .Nm munmap |
| | 41 | .Nd remove a mapping |
| | 42 | .Sh SYNOPSIS |
| | 43 | .Fd #include <sys/types.h> |
| | 44 | .Fd #include <sys/mman.h> |
| | 45 | .Ft int |
| | 46 | .Fn munmap "caddr_t addr" "size_t len" |
| | 47 | .Sh DESCRIPTION |
| | 48 | The |
| | 49 | .Fn munmap |
| | 50 | system call |
| | 51 | deletes the mappings for the specified address range, |
| | 52 | and causes further references to addresses within the range |
| | 53 | to generate invalid memory references. |
| | 54 | .Sh RETURN VALUES |
| | 55 | Upon successful completion, |
| | 56 | .Nm munmap |
| | 57 | returns zero. |
| | 58 | Otherwise, a value of -1 is returned and |
| | 59 | .Va errno |
| | 60 | is set to indicate the error. |
| | 61 | .Sh ERRORS |
| | 62 | .Fn Munmap |
| | 63 | will fail if: |
| | 64 | .Bl -tag -width Er |
| | 65 | .It Bq Er EINVAL |
| | 66 | The |
| | 67 | .Fa addr |
| | 68 | parameter was not page aligned, the |
| | 69 | .Fa len |
| | 70 | parameter was negative, or |
| | 71 | some part of the region being unmapped is not part of the currently |
| | 72 | valid address space. |
| | 73 | .Sh "SEE ALSO" |
| | 74 | .Xr getpagesize 3 , |
| | 75 | .Xr msync 2 , |
| | 76 | .Xr munmap 2 , |
| | 77 | .Xr mprotect 2 , |
| | 78 | .Xr madvise 2 , |
| | 79 | .Xr mincore 2 |
| | 80 | .Sh HISTORY |
| | 81 | The |
| | 82 | .Fn munmap |
| | 83 | function first appeared in 4.4BSD. |
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