03-23-2011
Quote:
Originally Posted by
varontron
Due to decent performance, I'm assuming the values in the header section are correct, but why the discrepancy?
That probably includes any shared memory, i.e. things like libc that get loaded into memory once but used in umpteen different processes.
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GET_END(3) Library Functions Manual GET_END(3)
NAME
get_end, get_etext, get_edata - get values of UNIX link editor defined symbols
SYNOPSIS
#include <mach-o/getsect.h>
unsigned long get_end();
unsigned long get_etext();
unsigned long get_edata();
DESCRIPTION
These routines provide a stopgap measure to programs that use the UNIX link-editor defined symbols. Use of these routines is very strongly
discouraged. The problem is that any program that is using UNIX link editor defined symbols (_end, _etext or _edata) is making assumptions
that the program has the memory layout of a UNIX program.
This is an incorrect assumption for a program built by the Mach-O link editor. The reason that these routines are provided is that if very
minimal assumptions about the layout are used and the default format and memory layout of the Mach-O link editor is used to build the pro-
gram, some things may work by using the values returned by these routines in place of the addresses of their UNIX link-editor defined sym-
bols. So use at your own risk, and only if you know what your doing. Or better yet, convert the program to use the appropriate Mach or
Mach-O functions. If you are trying to allocate memory use vm_allocate(2), if you are trying to find out about your address space use
vm_region(2) and if you are trying to find out where your program is loaded use the dyld(3) functions.
The values of the UNIX link-editor defined symbols _etext, _edata and _end are returned by the routines get_etext, get_edata, and get_end
respectively. In a Mach-O file they have the following values: get_etext returns the first address after the (__TEXT,__text) section, note
this my or may not be the only section in the __TEXT segment. get_edata returns the first address after the (__DATA,__data) section, note
this my or may not be the last non-zero fill section in the __DATA segment. get_end returns the first address after the last segment in
the executable, note a shared library may be loaded at this address.
SEE ALSO
ld(1), dyld(3)
Apple Computer, Inc. April 10, 1998 GET_END(3)