Re: Resolving a Mach-O symbol address into a variable address at runtime
Re: Resolving a Mach-O symbol address into a variable address at runtime
- Subject: Re: Resolving a Mach-O symbol address into a variable address at runtime
- From: "Peter O'Gorman" <email@hidden>
- Date: Wed, 12 Jul 2006 00:52:36 +0900
On Tue, 2006-07-11 at 10:34 -0500, Damien Sorresso wrote:
> I've got a loadable bundle in a Cocoa application, and I'd like this
> bundle to grab the value of a global symbol from the main application
> after it's been loaded, specifically a global debugging level.
>
> Now, I can grab the symbol's address using nlist(...), but I want to
> in turn take this address and find the location of the variable in
> memory at runtime. I've already tried CFBundleGetDataPointerForName
> (...); it doesn't work. Don't ask me why. I've been pouring over the
> Mach-O documentation, and I'm thinking that the best way to go about
> it would be to grab the `vmaddr' member of the `segment_command'
> structure to determine the VM address of the __DATA segment and then
> work from there, but I'm not sure how to specifically go about doing
> this.
Use dlopen/dlsym, see the manpages.
Peter
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