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authorRoland McGrath <roland@gnu.org>2004-10-20 06:43:15 +0000
committerRoland McGrath <roland@gnu.org>2004-10-20 06:43:15 +0000
commit604208c4dfe871ab55ab6725cb200e5fabf6ff7a (patch)
treefd779df2906d61cd47b6a9066efbd655a9409e01 /sysdeps/mach
parent356e4142951a3b22b583643733f64cb2ede36312 (diff)
downloadglibc-604208c4dfe871ab55ab6725cb200e5fabf6ff7a.tar.gz
2004-10-19 Roland McGrath <roland@frob.com>
* sysdeps/mach/readonly-area.c: New file.
Diffstat (limited to 'sysdeps/mach')
-rw-r--r--sysdeps/mach/readonly-area.c57
1 files changed, 57 insertions, 0 deletions
diff --git a/sysdeps/mach/readonly-area.c b/sysdeps/mach/readonly-area.c
new file mode 100644
index 0000000000..afee7a4bde
--- /dev/null
+++ b/sysdeps/mach/readonly-area.c
@@ -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 (),
+ &region_address, &region_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;
+}