3 ms·

I do use setsid when spawning the children (I omitted it from the post, but I set it in the dsme pre_exec call where I configure DEATHSIG) but they don't receiv

• bhawks 2y ago
  Calling setsid in pre_exec isn't exactly correct, you'd do this to daemonize a process in order to prevent it from getting signals from the process which spawned you exited or its terminal disconnected. If you read exit(3) you'll see that you also need a controlling terminal for the kernel to send SIGHUP to the processes in your foreground process group. In python it'd look roughly like: master, slave = os.openpty() # ensure we can call setsid successfully try: pid = os.fork() if pid > 0: os.close(master) os.close(slave) sys.exit(0) finally: sys.exit(1) os.setsid() # we are now session leader and process group leader fcntl.ioctl(master, termios.TIOCSCTTY, 0) # we now have a controlling pty - closing master will send us a SIGHUP os.close(slave) # go start spawning subprocesses - if _this_ process is killed, they will receive SIGHUPs. Unless they take themselves out of your session or the foreground process group.