macOS calling system return permission denied, why?

[jpopop]

On Mac 10.7, calling function system with parameter "open -a /Volumes/A/A.app" in my code in C language, system function return error: permission denied.but it works fine on Mac 10.6.
why? account rights managment change somthing on MAC 10.7?

thx

 

[jiminaus]

Can't talk about Lion, NDA.

But even under SL, that open command seems invalid. If you include the -a option then you're saying, open file x using app a. But you've only given app a, not file x. If you trying to run the app mounted in volume A, then I don't think you want the -a.

 

[kainjow]

You really should be using LSOpenApplication() to launch apps instead anyways.