-
Notifications
You must be signed in to change notification settings - Fork 0
Commit
This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
2004-10-19 Roland McGrath <roland@frob.com>
* sysdeps/mach/readonly-area.c: New file.
- Loading branch information
Roland McGrath
committed
Oct 20, 2004
1 parent
356e414
commit 604208c
Showing
1 changed file
with
57 additions
and
0 deletions.
There are no files selected for viewing
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -0,0 +1,57 @@ | ||
/* Test if a memory region is wholly unwritable. Mach version. | ||
Copyright (C) 2004 Free Software Foundation, Inc. | ||
This file is part of the GNU C Library. | ||
The GNU C Library is free software; you can redistribute it and/or | ||
modify it under the terms of the GNU Lesser General Public | ||
License as published by the Free Software Foundation; either | ||
version 2.1 of the License, or (at your option) any later version. | ||
The GNU C Library is distributed in the hope that it will be useful, | ||
but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | ||
Lesser General Public License for more details. | ||
You should have received a copy of the GNU Lesser General Public | ||
License along with the GNU C Library; if not, write to the Free | ||
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA | ||
02111-1307 USA. */ | ||
|
||
#include <stdlib.h> | ||
#include <stdint.h> | ||
#include <mach.h> | ||
|
||
/* Return 1 if the whole area PTR .. PTR+SIZE is not writable. | ||
Return -1 if it is writable. */ | ||
|
||
int | ||
__readonly_area (const char *ptr, size_t size) | ||
{ | ||
vm_address_t region_address = (uintptr_t) ptr; | ||
vm_size_t region_length = size; | ||
vm_prot_t protection; | ||
vm_prot_t max_protection; | ||
vm_inherit_t inheritance; | ||
boolean_t is_shared; | ||
mach_port_t object_name; | ||
vm_offset_t offset; | ||
|
||
while (__vm_region (__mach_task_self (), | ||
®ion_address, ®ion_length, | ||
&protection, &max_protection, &inheritance, &is_shared, | ||
&object_name, &offset) == KERN_SUCCESS | ||
&& region_address <= (uintptr_t) ptr) | ||
{ | ||
region_address += region_length; | ||
if (region_address < (uintptr_t) ptr) | ||
continue; | ||
|
||
if (protection & VM_PROT_WRITE) | ||
return -1; | ||
|
||
if (region_address - (uintptr_t) ptr >= size) | ||
break; | ||
} | ||
|
||
return 1; | ||
} |