site_archiver@lists.apple.com Delivered-To: darwin-kernel@lists.apple.com Dkim-signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:in-reply-to:references:from:date:message-id:subject:to; bh=pFy+HUx7shoVxCJpRA4Pf21b3sQK2wB6DSTVGjZOSMk=; b=BRRzXfBrUkNOp6AVxLeYzmnoyIU4yl2OcA2iib3utY+WrMOZPmPSOeamZasQaFWyZW Iw/cTRLJDVQs7+XWn5h3zM5uiSy6eOOs3uCAEYI70VfR16NrNkbm+wlKW8G8lAos5skL 2f6TKOqtcVRILKltci7Nzh78j2l2s5cG91NO0wqWahLWgWwQG0MGcywjSTCgHELJgwq8 SpXBbtetcvvfEv6JEIT0/87ib+TNdqZuVEjXsj7dzOcxf8pr2DMX333ufT2JC/oM3TI3 GmBmBIv80pd2fTncrt+lK5ME+ci2xqPEpMQyGkYn1uqSIJMvw5YwZtDy9/kIR0fQoA8B n9zw== assuming you have system integrity protection disabled for /usr/sbin write access, just rename the binary to something else (cupsd.orig) while it's still running and place your compiled version in its place. then run "sudo pkill cupsd" and when launchd attempts to restart its process (due to its KeepAlive plist key) it'll be running your version in its place. you don't necessarily need to have the program killed in order to modify or replace its binary since you loaded it into memory by executing it. On Wed, Dec 20, 2017 at 5:27 PM, Prokash Sinha <prokash@garlic.com> wrote:

Folks,

How do I debug cupsd ?

Basically I need to find some path of execution of the daemon.

What I’m trying to do is to have a debug build from the Apple source, and replace it in /usr/sbin after stoping the service first. Is this possible ? If so, then I can debug using Xcode.

otherwise I will have to use lldb ( to attach to the process and look thru back traces of release code — harder approach !!

Looking for a way to stop using launchctl command, replace the binary, restart.

Thanks, Prokash

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