163 lines
5 KiB
Groff
163 lines
5 KiB
Groff
|
.\"
|
||
|
|
.\" Copyright (c) 2008 Apple Inc. All rights reserved.
|
||
|
|
.\"
|
||
|
|
.\" @APPLE_LICENSE_HEADER_START@
|
||
|
|
.\"
|
||
|
|
.\" This file contains Original Code and/or Modifications of Original Code
|
||
|
|
.\" as defined in and that are subject to the Apple Public Source License
|
||
|
|
.\" Version 2.0 (the 'License'). You may not use this file except in
|
||
|
|
.\" compliance with the License. Please obtain a copy of the License at
|
||
|
|
.\" http://www.opensource.apple.com/apsl/ and read it before using this
|
||
|
|
.\" file.
|
||
|
|
.\"
|
||
|
|
.\" The Original Code and all software distributed under the License are
|
||
|
|
.\" distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
|
||
|
|
.\" EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
|
||
|
|
.\" INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
|
||
|
|
.\" FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
|
||
|
|
.\" Please see the License for the specific language governing rights and
|
||
|
|
.\" limitations under the License.
|
||
|
|
.\"
|
||
|
|
.\" @APPLE_LICENSE_HEADER_END@
|
||
|
|
.\"
|
||
|
|
.\"
|
||
|
|
.\" $NetBSD: mprotect.2,v 1.6 1995/10/12 15:41:08 jtc Exp $
|
||
|
|
.\"
|
||
|
|
.\" 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.
|
||
|
|
.\"
|
||
|
|
.\" @(#)mprotect.2 8.1 (Berkeley) 6/9/93
|
||
|
|
.\" $FreeBSD: src/lib/libc/sys/mprotect.2,v 1.18 2007/01/09 00:28:15 imp Exp $
|
||
|
|
.\"
|
||
|
|
.Dd October 16, 2008
|
||
|
|
.Dt MPROTECT 2
|
||
|
|
.Os
|
||
|
|
.Sh NAME
|
||
|
|
.Nm mprotect
|
||
|
|
.Nd control the protection of pages
|
||
|
|
.Sh SYNOPSIS
|
||
|
|
.Fd #include <sys/mman.h>
|
||
|
|
.Ft int
|
||
|
|
.Fo mprotect
|
||
|
|
.Fa "void *addr"
|
||
|
|
.Fa "size_t len"
|
||
|
|
.Fa "int prot"
|
||
|
|
.Fc
|
||
|
|
.Sh DESCRIPTION
|
||
|
|
The
|
||
|
|
.Fn mprotect
|
||
|
|
system call
|
||
|
|
changes the specified pages to have protection
|
||
|
|
.Fa prot .
|
||
|
|
Not all implementations will guarantee protection on a page basis but Mac OS X's
|
||
|
|
current implementation does.
|
||
|
|
.Pp
|
||
|
|
When a program violates the protections of a page, it gets a SIGBUS or SIGSEGV signal.
|
||
|
|
.Pp
|
||
|
|
Currently
|
||
|
|
.Fa prot
|
||
|
|
can be one or more of the following:
|
||
|
|
.Pp
|
||
|
|
.Bl -tag -width ".Dv PROT_WRITE" -compact
|
||
|
|
.It Dv PROT_NONE
|
||
|
|
No permissions at all.
|
||
|
|
.It Dv PROT_READ
|
||
|
|
The pages can be read.
|
||
|
|
.It Dv PROT_WRITE
|
||
|
|
The pages can be written.
|
||
|
|
.It Dv PROT_EXEC
|
||
|
|
The pages can be executed.
|
||
|
|
.El
|
||
|
|
.Sh RETURN VALUES
|
||
|
|
Upon successful completion,
|
||
|
|
a value of 0 is returned.
|
||
|
|
Otherwise, a value of -1 is returned and
|
||
|
|
.Va errno
|
||
|
|
is set to indicate the error.
|
||
|
|
.Sh ERRORS
|
||
|
|
.Fn mprotect
|
||
|
|
will fail if:
|
||
|
|
.Bl -tag -width Er
|
||
|
|
.\" ===========
|
||
|
|
.It Bq Er EACCES
|
||
|
|
The requested protection conflicts with
|
||
|
|
the access permissions of the process
|
||
|
|
on the specified address range.
|
||
|
|
.\" ===========
|
||
|
|
.\" .It Bq Er EAGAIN
|
||
|
|
.\" Insufficient memory resources exist to allow locking a private page
|
||
|
|
.\" under PROT_WRITE.
|
||
|
|
.\" ===========
|
||
|
|
.It Bq Er EINVAL
|
||
|
|
.Fa addr
|
||
|
|
is not a multiple of the page size (i.e.
|
||
|
|
.Fa addr
|
||
|
|
is not page-aligned).
|
||
|
|
.\" ===========
|
||
|
|
.It Bq Er ENOMEM
|
||
|
|
The specified address range is outside of the address range
|
||
|
|
of the process or includes an unmapped page.
|
||
|
|
.\" ===========
|
||
|
|
.It Bq Er ENOTSUP
|
||
|
|
The combination of accesses requested in
|
||
|
|
.Fa prot
|
||
|
|
is not supported.
|
||
|
|
.El
|
||
|
|
.Sh LEGACY SYNOPSIS
|
||
|
|
.Fd #include <sys/types.h>
|
||
|
|
.Fd #include <sys/mman.h>
|
||
|
|
.Pp
|
||
|
|
The include file
|
||
|
|
.In sys/types.h
|
||
|
|
is necessary.
|
||
|
|
.Pp
|
||
|
|
.Ft int
|
||
|
|
.br
|
||
|
|
.Fo mprotect
|
||
|
|
.Fa "caddr_t addr"
|
||
|
|
.Fa "size_t len"
|
||
|
|
.Fa "int prot"
|
||
|
|
.Fc ;
|
||
|
|
.Pp
|
||
|
|
The type of
|
||
|
|
.Fa addr
|
||
|
|
has changed.
|
||
|
|
.Sh SEE ALSO
|
||
|
|
.Xr madvise 2 ,
|
||
|
|
.Xr mincore 2 ,
|
||
|
|
.Xr msync 2 ,
|
||
|
|
.Xr munmap 2 ,
|
||
|
|
.Xr compat 5
|
||
|
|
.Sh HISTORY
|
||
|
|
The
|
||
|
|
.Fn mprotect
|
||
|
|
function first appeared in 4.4BSD.
|