kill application from other application on ios 6 using void kill dont work

Question

i got jailbreak iphone ios 6

in my tweak on ios 4&5 I used (void) kill to close other app running in the background. this is my code:

Answer 1

Just to expand on Victors answer a bit... you want to get the pid from the application and if it is greater than 0(a valid pid), kill it with either SIGTERM(Nicer, though it's not guaranteed to kill it) or SIGKILL(Forceful Termination)

SBApplicationController *appController = [objc_getClass("SBApplicationController") sharedInstance];
SBApplication *app = [appController applicationWithDisplayIdentifier:appId];
if (app.pid > 0)
    kill(app.pid, SIGTERM);

Info About Termination Signals: http://www.gnu.org/software/libc/manual/html_node/Termination-Signals.html