| | 1 | .\" |
| | 2 | .\" Copyright (c) 2008 Apple Inc. All rights reserved. |
| | 3 | .\" |
| | 4 | .\" @APPLE_LICENSE_HEADER_START@ |
| | 5 | .\" |
| | 6 | .\" This file contains Original Code and/or Modifications of Original Code |
| | 7 | .\" as defined in and that are subject to the Apple Public Source License |
| | 8 | .\" Version 2.0 (the 'License'). You may not use this file except in |
| | 9 | .\" compliance with the License. Please obtain a copy of the License at |
| | 10 | .\" http://www.opensource.apple.com/apsl/ and read it before using this |
| | 11 | .\" file. |
| | 12 | .\" |
| | 13 | .\" The Original Code and all software distributed under the License are |
| | 14 | .\" distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER |
| | 15 | .\" EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, |
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| | 17 | .\" FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. |
| | 18 | .\" Please see the License for the specific language governing rights and |
| | 19 | .\" limitations under the License. |
| | 20 | .\" |
| | 21 | .\" @APPLE_LICENSE_HEADER_END@ |
| | 22 | .\" |
| | 23 | .\" |
| | 24 | .\" $NetBSD: mprotect.2,v 1.6 1995/10/12 15:41:08 jtc Exp $ |
| | 25 | .\" |
| | 26 | .\" Copyright (c) 1991, 1993 |
| | 27 | .\" The Regents of the University of California. All rights reserved. |
| | 28 | .\" |
| | 29 | .\" Redistribution and use in source and binary forms, with or without |
| | 30 | .\" modification, are permitted provided that the following conditions |
| | 31 | .\" are met: |
| | 32 | .\" 1. Redistributions of source code must retain the above copyright |
| | 33 | .\" notice, this list of conditions and the following disclaimer. |
| | 34 | .\" 2. Redistributions in binary form must reproduce the above copyright |
| | 35 | .\" notice, this list of conditions and the following disclaimer in the |
| | 36 | .\" documentation and/or other materials provided with the distribution. |
| | 37 | .\" 3. All advertising materials mentioning features or use of this software |
| | 38 | .\" must display the following acknowledgement: |
| | 39 | .\" This product includes software developed by the University of |
| | 40 | .\" California, Berkeley and its contributors. |
| | 41 | .\" 4. Neither the name of the University nor the names of its contributors |
| | 42 | .\" may be used to endorse or promote products derived from this software |
| | 43 | .\" without specific prior written permission. |
| | 44 | .\" |
| | 45 | .\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
| | 46 | .\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| | 47 | .\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| | 48 | .\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
| | 49 | .\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| | 50 | .\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| | 51 | .\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| | 52 | .\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| | 53 | .\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| | 54 | .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| | 55 | .\" SUCH DAMAGE. |
| | 56 | .\" |
| | 57 | .\" @(#)mprotect.2 8.1 (Berkeley) 6/9/93 |
| | 58 | .\" $FreeBSD: src/lib/libc/sys/mprotect.2,v 1.18 2007/01/09 00:28:15 imp Exp $ |
| | 59 | .\" |
| | 60 | .Dd October 16, 2008 |
| | 61 | .Dt MPROTECT 2 |
| | 62 | .Os |
| | 63 | .Sh NAME |
| | 64 | .Nm mprotect |
| | 65 | .Nd control the protection of pages |
| | 66 | .Sh SYNOPSIS |
| | 67 | .Fd #include <sys/mman.h> |
| | 68 | .Ft int |
| | 69 | .Fo mprotect |
| | 70 | .Fa "void *addr" |
| | 71 | .Fa "size_t len" |
| | 72 | .Fa "int prot" |
| | 73 | .Fc |
| | 74 | .Sh DESCRIPTION |
| | 75 | The |
| | 76 | .Fn mprotect |
| | 77 | system call |
| | 78 | changes the specified pages to have protection |
| | 79 | .Fa prot . |
| | 80 | Not all implementations will guarantee protection on a page basis but Mac OS X's |
| | 81 | current implementation does. |
| | 82 | .Pp |
| | 83 | When a program violates the protections of a page, it gets a SIGBUS or SIGSEGV signal. |
| | 84 | .Pp |
| | 85 | Currently |
| | 86 | .Fa prot |
| | 87 | can be one or more of the following: |
| | 88 | .Pp |
| | 89 | .Bl -tag -width ".Dv PROT_WRITE" -compact |
| | 90 | .It Dv PROT_NONE |
| | 91 | No permissions at all. |
| | 92 | .It Dv PROT_READ |
| | 93 | The pages can be read. |
| | 94 | .It Dv PROT_WRITE |
| | 95 | The pages can be written. |
| | 96 | .It Dv PROT_EXEC |
| | 97 | The pages can be executed. |
| | 98 | .El |
| | 99 | .Sh RETURN VALUES |
| | 100 | Upon successful completion, |
| | 101 | a value of 0 is returned. |
| | 102 | Otherwise, a value of -1 is returned and |
| | 103 | .Va errno |
| | 104 | is set to indicate the error. |
| | 105 | .Sh ERRORS |
| | 106 | .Fn mprotect |
| | 107 | will fail if: |
| | 108 | .Bl -tag -width Er |
| | 109 | .\" =========== |
| | 110 | .It Bq Er EACCES |
| | 111 | The requested protection conflicts with |
| | 112 | the access permissions of the process |
| | 113 | on the specified address range. |
| | 114 | .\" =========== |
| | 115 | .\" .It Bq Er EAGAIN |
| | 116 | .\" Insufficient memory resources exist to allow locking a private page |
| | 117 | .\" under PROT_WRITE. |
| | 118 | .\" =========== |
| | 119 | .It Bq Er EINVAL |
| | 120 | .Fa addr |
| | 121 | is not a multiple of the page size (i.e. |
| | 122 | .Fa addr |
| | 123 | is not page-aligned). |
| | 124 | .\" =========== |
| | 125 | .\" .It Bq Er ENOMEM |
| | 126 | .\" The specified address range is outside of the address range |
| | 127 | .\" of the process or includes an unmapped page. |
| | 128 | .\" =========== |
| | 129 | .It Bq Er ENOTSUP |
| | 130 | The combination of accesses requested in |
| | 131 | .Fa prot |
| | 132 | is not supported. |
| | 133 | .El |
| | 134 | .Sh LEGACY SYNOPSIS |
| | 135 | .Fd #include <sys/types.h> |
| | 136 | .Fd #include <sys/mman.h> |
| | 137 | .Pp |
| | 138 | The include file |
| | 139 | .In sys/types.h |
| | 140 | is necessary. |
| | 141 | .Pp |
| | 142 | .Ft int |
| | 143 | .br |
| | 144 | .Fo mprotect |
| | 145 | .Fa "caddr_t addr" |
| | 146 | .Fa "size_t len" |
| | 147 | .Fa "int prot" |
| | 148 | .Fc ; |
| | 149 | .Pp |
| | 150 | The type of |
| | 151 | .Fa addr |
| | 152 | has changed. |
| | 153 | .Sh SEE ALSO |
| | 154 | .Xr madvise 2 , |
| | 155 | .Xr mincore 2 , |
| | 156 | .Xr msync 2 , |
| | 157 | .Xr munmap 2 , |
| | 158 | .Xr compat 5 |
| | 159 | .Sh HISTORY |
| | 160 | The |
| | 161 | .Fn mprotect |
| | 162 | function first appeared in 4.4BSD. |
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