objective c - Cannot invalidate launchd kextcache from helper executable -

i've built uninstaller call helper executable elevated permissions remove driver's launchd-plist, won't come again on next boot cycle.

in order reflect new stage of /library/launchdaemons, invalidate kextcache using following command touch /library/extensions/ showed in question.

however, when helper executable right after plist file removed, wouldn't succeed, , driver still go after reboot. when manually typing command touch /library/extensions right after uninstaller helper finish, trick.

here's how code looks in first option (invalidate helper exec).

        remove(osx_launchd_plist_path);         pid_t pid = -1;         char const * args[] = {"touch", "/library/extensions", null};         posix_spawn(&pid, "/usr/bin/touch", null, null, (char **)args, null);         waitpid(pid, &status, wnohang|wuntraced); 

perhaps tell me why different behaviour in each of options.

update:

it seems cache invalidation requires repeat command more once. code worked me, don't have clue why ...

        (int x=0 ; x < 2; x++ ) {             char const * args[] = {"touch", "/library/extensions", null};             posix_spawn(&pid, "/usr/bin/touch", null, null, (char **)args, null);             waitpid(pid, &status, wnohang|wuntraced);             char const * args2[] = {"touch", "/system/library/extensions", null};             posix_spawn(&pid, "/usr/bin/touch", null, null, (char **)args2, null);             waitpid(pid, &status, wnohang|wuntraced);         }