Mac OS app debug

wx69wx2023 · #1 04-09-2024, 20:06

If you start the app with the following mysterious parameters, the hidden debug menu will be displayed.
"-_NS_4445425547 yes"

https://mjtsai.com/blog/2024/03/22/_eventfirstresponderchaindescription/#comment-4059578

WRP · #2 04-10-2024, 13:53

Good. But which debugger will be used?

Jupiter · #3 04-10-2024, 20:37

Quote:

Originally Posted by WRP

But which debugger will be used?

This is not about running under the Xcode debugger, but about the appearance of the debug menu while running an application (even without debugger at all).

Using Radare2 rax2 command:

Code:

rax2 -S 'DEBUG'

Output:

Code:

4445425547

Adding per app setting in preferences (stored in ~/Library/Containers/)

Sample app is TextEdit (CFBundleIdentifier is com.apple.TextEdit):

Code:

defaults write com.apple.TextEdit _NS_4445425547 -bool true

Run app:

Code:

open -a TextEdit

You'll see bug icon in menu (before Help menu).

Adding global system setting in preferences

Code:

defaults write -g _NS_4445425547 -bool true

Reading global value:

Code:

defaults read -g _NS_4445425547

Sample output:

Code:

The domain/default pair of (kCFPreferencesAnyApplication, _NS_4445425547) does not exist

The Following 2 Users Say Thank You to wx69wx2023 For This Useful Post:
tonyweb (04-13-2024), WRP (04-10-2024)

The Following 2 Users Say Thank You to Jupiter For This Useful Post:
tonyweb (04-13-2024), wx69wx2023 (04-11-2024)