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You've made things much harder on yourself by using files instead of IPC, but all isn't lost. Linux can watch for filesystem changes with the inotify (http://linux.die.net/man/7/inotify) system.
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I suspect you may need to redesign your application for this but, the best and proper way to wait for child processes to finish is simply wait() -- or its related call waitpid(): waitpid(child_pid,...

There's lots of ways to do this in UNIX.

The simplest way to fix your loop is to add a usleep(100000); at the bottom of your while(1) loop: This will put the process to sleep for at least 100...